author | Joshua M. Clulow <jmc@joyent.com> |
Mon, 04 Mar 2013 23:52:56 +0000 | |
changeset 14188 | afe390b9f1e0 |
parent 14179 | 15e9457c12ec |
permissions | -rw-r--r-- |
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/* |
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* CDDL HEADER START |
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* |
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* The contents of this file are subject to the terms of the |
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* Common Development and Distribution License (the "License"). |
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* You may not use this file except in compliance with the License. |
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* |
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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* or http://www.opensolaris.org/os/licensing. |
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* See the License for the specific language governing permissions |
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* and limitations under the License. |
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* |
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* When distributing Covered Code, include this CDDL HEADER in each |
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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* If applicable, add the following below this CDDL HEADER, with the |
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* fields enclosed by brackets "[]" replaced with your own identifying |
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* information: Portions Copyright [yyyy] [name of copyright owner] |
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* |
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* CDDL HEADER END |
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*/ |
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/* |
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
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* Copyright 2011 Nexenta Systems, Inc. All rights reserved. |
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* Copyright (c) 2012, Joyent, Inc. All rights reserved. |
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* Copyright (c) 2013 by Delphix. All rights reserved. |
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* Copyright (c) 2013 by Saso Kiselkov. All rights reserved. |
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*/ |
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||
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/* |
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* DVA-based Adjustable Replacement Cache |
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* |
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* While much of the theory of operation used here is |
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* based on the self-tuning, low overhead replacement cache |
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* presented by Megiddo and Modha at FAST 2003, there are some |
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* significant differences: |
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* |
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* 1. The Megiddo and Modha model assumes any page is evictable. |
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* Pages in its cache cannot be "locked" into memory. This makes |
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* the eviction algorithm simple: evict the last page in the list. |
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* This also make the performance characteristics easy to reason |
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* about. Our cache is not so simple. At any given moment, some |
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* subset of the blocks in the cache are un-evictable because we |
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* have handed out a reference to them. Blocks are only evictable |
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* when there are no external references active. This makes |
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* eviction far more problematic: we choose to evict the evictable |
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* blocks that are the "lowest" in the list. |
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* |
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* There are times when it is not possible to evict the requested |
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* space. In these circumstances we are unable to adjust the cache |
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* size. To prevent the cache growing unbounded at these times we |
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* implement a "cache throttle" that slows the flow of new data |
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* into the cache until we can make space available. |
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* |
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* 2. The Megiddo and Modha model assumes a fixed cache size. |
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* Pages are evicted when the cache is full and there is a cache |
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* miss. Our model has a variable sized cache. It grows with |
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* high use, but also tries to react to memory pressure from the |
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* operating system: decreasing its size when system memory is |
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* tight. |
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* |
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* 3. The Megiddo and Modha model assumes a fixed page size. All |
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* elements of the cache are therefore exactly the same size. So |
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* when adjusting the cache size following a cache miss, its simply |
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* a matter of choosing a single page to evict. In our model, we |
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* have variable sized cache blocks (rangeing from 512 bytes to |
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* 128K bytes). We therefore choose a set of blocks to evict to make |
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* space for a cache miss that approximates as closely as possible |
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* the space used by the new block. |
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* |
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* See also: "ARC: A Self-Tuning, Low Overhead Replacement Cache" |
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* by N. Megiddo & D. Modha, FAST 2003 |
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*/ |
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/* |
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* The locking model: |
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* |
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* A new reference to a cache buffer can be obtained in two |
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* ways: 1) via a hash table lookup using the DVA as a key, |
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* or 2) via one of the ARC lists. The arc_read() interface |
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* uses method 1, while the internal arc algorithms for |
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* adjusting the cache use method 2. We therefore provide two |
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* types of locks: 1) the hash table lock array, and 2) the |
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* arc list locks. |
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* |
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* Buffers do not have their own mutexes, rather they rely on the |
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* hash table mutexes for the bulk of their protection (i.e. most |
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* fields in the arc_buf_hdr_t are protected by these mutexes). |
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* |
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* buf_hash_find() returns the appropriate mutex (held) when it |
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* locates the requested buffer in the hash table. It returns |
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* NULL for the mutex if the buffer was not in the table. |
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* |
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* buf_hash_remove() expects the appropriate hash mutex to be |
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* already held before it is invoked. |
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* |
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* Each arc state also has a mutex which is used to protect the |
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* buffer list associated with the state. When attempting to |
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* obtain a hash table lock while holding an arc list lock you |
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* must use: mutex_tryenter() to avoid deadlock. Also note that |
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* the active state mutex must be held before the ghost state mutex. |
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* |
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* Arc buffers may have an associated eviction callback function. |
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* This function will be invoked prior to removing the buffer (e.g. |
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* in arc_do_user_evicts()). Note however that the data associated |
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* with the buffer may be evicted prior to the callback. The callback |
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* must be made with *no locks held* (to prevent deadlock). Additionally, |
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* the users of callbacks must ensure that their private data is |
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* protected from simultaneous callbacks from arc_buf_evict() |
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* and arc_do_user_evicts(). |
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* |
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* Note that the majority of the performance stats are manipulated |
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* with atomic operations. |
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* |
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* The L2ARC uses the l2arc_buflist_mtx global mutex for the following: |
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* |
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* - L2ARC buflist creation |
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* - L2ARC buflist eviction |
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* - L2ARC write completion, which walks L2ARC buflists |
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* - ARC header destruction, as it removes from L2ARC buflists |
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* - ARC header release, as it removes from L2ARC buflists |
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*/ |
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#include <sys/spa.h> |
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#include <sys/zio.h> |
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#include <sys/zio_compress.h> |
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#include <sys/zfs_context.h> |
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#include <sys/arc.h> |
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#include <sys/refcount.h> |
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#include <sys/vdev.h> |
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#include <sys/vdev_impl.h> |
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#include <sys/dsl_pool.h> |
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#ifdef _KERNEL |
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#include <sys/vmsystm.h> |
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#include <vm/anon.h> |
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#include <sys/fs/swapnode.h> |
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#include <sys/dnlc.h> |
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#endif |
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#include <sys/callb.h> |
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#include <sys/kstat.h> |
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#include <zfs_fletcher.h> |
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#ifndef _KERNEL |
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/* set with ZFS_DEBUG=watch, to enable watchpoints on frozen buffers */ |
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boolean_t arc_watch = B_FALSE; |
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int arc_procfd; |
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#endif |
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static kmutex_t arc_reclaim_thr_lock; |
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static kcondvar_t arc_reclaim_thr_cv; /* used to signal reclaim thr */ |
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static uint8_t arc_thread_exit; |
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||
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#define ARC_REDUCE_DNLC_PERCENT 3 |
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uint_t arc_reduce_dnlc_percent = ARC_REDUCE_DNLC_PERCENT; |
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typedef enum arc_reclaim_strategy { |
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ARC_RECLAIM_AGGR, /* Aggressive reclaim strategy */ |
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ARC_RECLAIM_CONS /* Conservative reclaim strategy */ |
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} arc_reclaim_strategy_t; |
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/* |
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* The number of iterations through arc_evict_*() before we |
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* drop & reacquire the lock. |
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*/ |
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int arc_evict_iterations = 100; |
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/* number of seconds before growing cache again */ |
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static int arc_grow_retry = 60; |
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/* shift of arc_c for calculating both min and max arc_p */ |
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static int arc_p_min_shift = 4; |
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/* log2(fraction of arc to reclaim) */ |
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static int arc_shrink_shift = 5; |
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/* |
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* minimum lifespan of a prefetch block in clock ticks |
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* (initialized in arc_init()) |
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*/ |
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static int arc_min_prefetch_lifespan; |
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/* |
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* If this percent of memory is free, don't throttle. |
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*/ |
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int arc_lotsfree_percent = 10; |
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static int arc_dead; |
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188 |
/* |
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* The arc has filled available memory and has now warmed up. |
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*/ |
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static boolean_t arc_warm; |
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/* |
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* These tunables are for performance analysis. |
195 |
*/ |
|
196 |
uint64_t zfs_arc_max; |
|
197 |
uint64_t zfs_arc_min; |
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uint64_t zfs_arc_meta_limit = 0; |
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int zfs_arc_grow_retry = 0; |
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int zfs_arc_shrink_shift = 0; |
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int zfs_arc_p_min_shift = 0; |
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int zfs_disable_dup_eviction = 0; |
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|
204 |
/* |
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5450 | 205 |
* Note that buffers can be in one of 6 states: |
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* ARC_anon - anonymous (discussed below) |
1544 | 207 |
* ARC_mru - recently used, currently cached |
208 |
* ARC_mru_ghost - recentely used, no longer in cache |
|
209 |
* ARC_mfu - frequently used, currently cached |
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210 |
* ARC_mfu_ghost - frequently used, no longer in cache |
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* ARC_l2c_only - exists in L2ARC but not other states |
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* When there are no active references to the buffer, they are |
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* are linked onto a list in one of these arc states. These are |
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* the only buffers that can be evicted or deleted. Within each |
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* state there are multiple lists, one for meta-data and one for |
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* non-meta-data. Meta-data (indirect blocks, blocks of dnodes, |
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* etc.) is tracked separately so that it can be managed more |
5450 | 218 |
* explicitly: favored over data, limited explicitly. |
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* |
220 |
* Anonymous buffers are buffers that are not associated with |
|
221 |
* a DVA. These are buffers that hold dirty block copies |
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222 |
* before they are written to stable storage. By definition, |
|
1544 | 223 |
* they are "ref'd" and are considered part of arc_mru |
789 | 224 |
* that cannot be freed. Generally, they will aquire a DVA |
1544 | 225 |
* as they are written and migrate onto the arc_mru list. |
5450 | 226 |
* |
227 |
* The ARC_l2c_only state is for buffers that are in the second |
|
228 |
* level ARC but no longer in any of the ARC_m* lists. The second |
|
229 |
* level ARC itself may also contain buffers that are in any of |
|
230 |
* the ARC_m* states - meaning that a buffer can exist in two |
|
231 |
* places. The reason for the ARC_l2c_only state is to keep the |
|
232 |
* buffer header in the hash table, so that reads that hit the |
|
233 |
* second level ARC benefit from these fast lookups. |
|
789 | 234 |
*/ |
235 |
||
236 |
typedef struct arc_state { |
|
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237 |
list_t arcs_list[ARC_BUFC_NUMTYPES]; /* list of evictable buffers */ |
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|
238 |
uint64_t arcs_lsize[ARC_BUFC_NUMTYPES]; /* amount of evictable data */ |
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|
239 |
uint64_t arcs_size; /* total amount of data in this state */ |
3403 | 240 |
kmutex_t arcs_mtx; |
789 | 241 |
} arc_state_t; |
242 |
||
5450 | 243 |
/* The 6 states: */ |
789 | 244 |
static arc_state_t ARC_anon; |
1544 | 245 |
static arc_state_t ARC_mru; |
246 |
static arc_state_t ARC_mru_ghost; |
|
247 |
static arc_state_t ARC_mfu; |
|
248 |
static arc_state_t ARC_mfu_ghost; |
|
5450 | 249 |
static arc_state_t ARC_l2c_only; |
789 | 250 |
|
3403 | 251 |
typedef struct arc_stats { |
252 |
kstat_named_t arcstat_hits; |
|
253 |
kstat_named_t arcstat_misses; |
|
254 |
kstat_named_t arcstat_demand_data_hits; |
|
255 |
kstat_named_t arcstat_demand_data_misses; |
|
256 |
kstat_named_t arcstat_demand_metadata_hits; |
|
257 |
kstat_named_t arcstat_demand_metadata_misses; |
|
258 |
kstat_named_t arcstat_prefetch_data_hits; |
|
259 |
kstat_named_t arcstat_prefetch_data_misses; |
|
260 |
kstat_named_t arcstat_prefetch_metadata_hits; |
|
261 |
kstat_named_t arcstat_prefetch_metadata_misses; |
|
262 |
kstat_named_t arcstat_mru_hits; |
|
263 |
kstat_named_t arcstat_mru_ghost_hits; |
|
264 |
kstat_named_t arcstat_mfu_hits; |
|
265 |
kstat_named_t arcstat_mfu_ghost_hits; |
|
266 |
kstat_named_t arcstat_deleted; |
|
267 |
kstat_named_t arcstat_recycle_miss; |
|
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|
268 |
/* |
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|
269 |
* Number of buffers that could not be evicted because the hash lock |
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|
270 |
* was held by another thread. The lock may not necessarily be held |
9475b3fef59d
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|
271 |
* by something using the same buffer, since hash locks are shared |
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|
272 |
* by multiple buffers. |
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|
273 |
*/ |
3403 | 274 |
kstat_named_t arcstat_mutex_miss; |
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|
275 |
/* |
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|
276 |
* Number of buffers skipped because they have I/O in progress, are |
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|
277 |
* indrect prefetch buffers that have not lived long enough, or are |
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|
278 |
* not from the spa we're trying to evict from. |
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|
279 |
*/ |
3403 | 280 |
kstat_named_t arcstat_evict_skip; |
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|
281 |
kstat_named_t arcstat_evict_l2_cached; |
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|
282 |
kstat_named_t arcstat_evict_l2_eligible; |
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|
283 |
kstat_named_t arcstat_evict_l2_ineligible; |
3403 | 284 |
kstat_named_t arcstat_hash_elements; |
285 |
kstat_named_t arcstat_hash_elements_max; |
|
286 |
kstat_named_t arcstat_hash_collisions; |
|
287 |
kstat_named_t arcstat_hash_chains; |
|
288 |
kstat_named_t arcstat_hash_chain_max; |
|
289 |
kstat_named_t arcstat_p; |
|
290 |
kstat_named_t arcstat_c; |
|
291 |
kstat_named_t arcstat_c_min; |
|
292 |
kstat_named_t arcstat_c_max; |
|
293 |
kstat_named_t arcstat_size; |
|
5450 | 294 |
kstat_named_t arcstat_hdr_size; |
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|
295 |
kstat_named_t arcstat_data_size; |
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|
296 |
kstat_named_t arcstat_other_size; |
5450 | 297 |
kstat_named_t arcstat_l2_hits; |
298 |
kstat_named_t arcstat_l2_misses; |
|
299 |
kstat_named_t arcstat_l2_feeds; |
|
300 |
kstat_named_t arcstat_l2_rw_clash; |
|
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|
301 |
kstat_named_t arcstat_l2_read_bytes; |
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changeset
|
302 |
kstat_named_t arcstat_l2_write_bytes; |
5450 | 303 |
kstat_named_t arcstat_l2_writes_sent; |
304 |
kstat_named_t arcstat_l2_writes_done; |
|
305 |
kstat_named_t arcstat_l2_writes_error; |
|
306 |
kstat_named_t arcstat_l2_writes_hdr_miss; |
|
307 |
kstat_named_t arcstat_l2_evict_lock_retry; |
|
308 |
kstat_named_t arcstat_l2_evict_reading; |
|
309 |
kstat_named_t arcstat_l2_free_on_write; |
|
310 |
kstat_named_t arcstat_l2_abort_lowmem; |
|
311 |
kstat_named_t arcstat_l2_cksum_bad; |
|
312 |
kstat_named_t arcstat_l2_io_error; |
|
313 |
kstat_named_t arcstat_l2_size; |
|
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|
314 |
kstat_named_t arcstat_l2_asize; |
5450 | 315 |
kstat_named_t arcstat_l2_hdr_size; |
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|
316 |
kstat_named_t arcstat_l2_compress_successes; |
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|
317 |
kstat_named_t arcstat_l2_compress_zeros; |
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|
318 |
kstat_named_t arcstat_l2_compress_failures; |
6245
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|
319 |
kstat_named_t arcstat_memory_throttle_count; |
13840
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|
320 |
kstat_named_t arcstat_duplicate_buffers; |
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diff
changeset
|
321 |
kstat_named_t arcstat_duplicate_buffers_size; |
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|
322 |
kstat_named_t arcstat_duplicate_reads; |
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|
323 |
kstat_named_t arcstat_meta_used; |
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|
324 |
kstat_named_t arcstat_meta_limit; |
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|
325 |
kstat_named_t arcstat_meta_max; |
3403 | 326 |
} arc_stats_t; |
327 |
||
328 |
static arc_stats_t arc_stats = { |
|
329 |
{ "hits", KSTAT_DATA_UINT64 }, |
|
330 |
{ "misses", KSTAT_DATA_UINT64 }, |
|
331 |
{ "demand_data_hits", KSTAT_DATA_UINT64 }, |
|
332 |
{ "demand_data_misses", KSTAT_DATA_UINT64 }, |
|
333 |
{ "demand_metadata_hits", KSTAT_DATA_UINT64 }, |
|
334 |
{ "demand_metadata_misses", KSTAT_DATA_UINT64 }, |
|
335 |
{ "prefetch_data_hits", KSTAT_DATA_UINT64 }, |
|
336 |
{ "prefetch_data_misses", KSTAT_DATA_UINT64 }, |
|
337 |
{ "prefetch_metadata_hits", KSTAT_DATA_UINT64 }, |
|
338 |
{ "prefetch_metadata_misses", KSTAT_DATA_UINT64 }, |
|
339 |
{ "mru_hits", KSTAT_DATA_UINT64 }, |
|
340 |
{ "mru_ghost_hits", KSTAT_DATA_UINT64 }, |
|
341 |
{ "mfu_hits", KSTAT_DATA_UINT64 }, |
|
342 |
{ "mfu_ghost_hits", KSTAT_DATA_UINT64 }, |
|
343 |
{ "deleted", KSTAT_DATA_UINT64 }, |
|
344 |
{ "recycle_miss", KSTAT_DATA_UINT64 }, |
|
345 |
{ "mutex_miss", KSTAT_DATA_UINT64 }, |
|
346 |
{ "evict_skip", KSTAT_DATA_UINT64 }, |
|
10357
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|
347 |
{ "evict_l2_cached", KSTAT_DATA_UINT64 }, |
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changeset
|
348 |
{ "evict_l2_eligible", KSTAT_DATA_UINT64 }, |
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changeset
|
349 |
{ "evict_l2_ineligible", KSTAT_DATA_UINT64 }, |
3403 | 350 |
{ "hash_elements", KSTAT_DATA_UINT64 }, |
351 |
{ "hash_elements_max", KSTAT_DATA_UINT64 }, |
|
352 |
{ "hash_collisions", KSTAT_DATA_UINT64 }, |
|
353 |
{ "hash_chains", KSTAT_DATA_UINT64 }, |
|
354 |
{ "hash_chain_max", KSTAT_DATA_UINT64 }, |
|
355 |
{ "p", KSTAT_DATA_UINT64 }, |
|
356 |
{ "c", KSTAT_DATA_UINT64 }, |
|
357 |
{ "c_min", KSTAT_DATA_UINT64 }, |
|
358 |
{ "c_max", KSTAT_DATA_UINT64 }, |
|
5450 | 359 |
{ "size", KSTAT_DATA_UINT64 }, |
360 |
{ "hdr_size", KSTAT_DATA_UINT64 }, |
|
8582
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diff
changeset
|
361 |
{ "data_size", KSTAT_DATA_UINT64 }, |
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8241
diff
changeset
|
362 |
{ "other_size", KSTAT_DATA_UINT64 }, |
5450 | 363 |
{ "l2_hits", KSTAT_DATA_UINT64 }, |
364 |
{ "l2_misses", KSTAT_DATA_UINT64 }, |
|
365 |
{ "l2_feeds", KSTAT_DATA_UINT64 }, |
|
366 |
{ "l2_rw_clash", KSTAT_DATA_UINT64 }, |
|
8582
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diff
changeset
|
367 |
{ "l2_read_bytes", KSTAT_DATA_UINT64 }, |
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diff
changeset
|
368 |
{ "l2_write_bytes", KSTAT_DATA_UINT64 }, |
5450 | 369 |
{ "l2_writes_sent", KSTAT_DATA_UINT64 }, |
370 |
{ "l2_writes_done", KSTAT_DATA_UINT64 }, |
|
371 |
{ "l2_writes_error", KSTAT_DATA_UINT64 }, |
|
372 |
{ "l2_writes_hdr_miss", KSTAT_DATA_UINT64 }, |
|
373 |
{ "l2_evict_lock_retry", KSTAT_DATA_UINT64 }, |
|
374 |
{ "l2_evict_reading", KSTAT_DATA_UINT64 }, |
|
375 |
{ "l2_free_on_write", KSTAT_DATA_UINT64 }, |
|
376 |
{ "l2_abort_lowmem", KSTAT_DATA_UINT64 }, |
|
377 |
{ "l2_cksum_bad", KSTAT_DATA_UINT64 }, |
|
378 |
{ "l2_io_error", KSTAT_DATA_UINT64 }, |
|
379 |
{ "l2_size", KSTAT_DATA_UINT64 }, |
|
14039
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3137 L2ARC compression
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|
380 |
{ "l2_asize", KSTAT_DATA_UINT64 }, |
6245
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|
381 |
{ "l2_hdr_size", KSTAT_DATA_UINT64 }, |
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|
382 |
{ "l2_compress_successes", KSTAT_DATA_UINT64 }, |
6cfd5a5778b9
3137 L2ARC compression
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changeset
|
383 |
{ "l2_compress_zeros", KSTAT_DATA_UINT64 }, |
6cfd5a5778b9
3137 L2ARC compression
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13980
diff
changeset
|
384 |
{ "l2_compress_failures", KSTAT_DATA_UINT64 }, |
13840
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3145 single-copy arc
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diff
changeset
|
385 |
{ "memory_throttle_count", KSTAT_DATA_UINT64 }, |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
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diff
changeset
|
386 |
{ "duplicate_buffers", KSTAT_DATA_UINT64 }, |
97fd5cdf328a
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|
387 |
{ "duplicate_buffers_size", KSTAT_DATA_UINT64 }, |
13958
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|
388 |
{ "duplicate_reads", KSTAT_DATA_UINT64 }, |
1fd91513472c
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changeset
|
389 |
{ "arc_meta_used", KSTAT_DATA_UINT64 }, |
1fd91513472c
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changeset
|
390 |
{ "arc_meta_limit", KSTAT_DATA_UINT64 }, |
1fd91513472c
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changeset
|
391 |
{ "arc_meta_max", KSTAT_DATA_UINT64 } |
3403 | 392 |
}; |
789 | 393 |
|
3403 | 394 |
#define ARCSTAT(stat) (arc_stats.stat.value.ui64) |
395 |
||
396 |
#define ARCSTAT_INCR(stat, val) \ |
|
14046
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diff
changeset
|
397 |
atomic_add_64(&arc_stats.stat.value.ui64, (val)) |
3403 | 398 |
|
10922
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diff
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|
399 |
#define ARCSTAT_BUMP(stat) ARCSTAT_INCR(stat, 1) |
3403 | 400 |
#define ARCSTAT_BUMPDOWN(stat) ARCSTAT_INCR(stat, -1) |
401 |
||
402 |
#define ARCSTAT_MAX(stat, val) { \ |
|
403 |
uint64_t m; \ |
|
404 |
while ((val) > (m = arc_stats.stat.value.ui64) && \ |
|
405 |
(m != atomic_cas_64(&arc_stats.stat.value.ui64, m, (val)))) \ |
|
406 |
continue; \ |
|
407 |
} |
|
408 |
||
409 |
#define ARCSTAT_MAXSTAT(stat) \ |
|
410 |
ARCSTAT_MAX(stat##_max, arc_stats.stat.value.ui64) |
|
789 | 411 |
|
3403 | 412 |
/* |
413 |
* We define a macro to allow ARC hits/misses to be easily broken down by |
|
414 |
* two separate conditions, giving a total of four different subtypes for |
|
415 |
* each of hits and misses (so eight statistics total). |
|
416 |
*/ |
|
417 |
#define ARCSTAT_CONDSTAT(cond1, stat1, notstat1, cond2, stat2, notstat2, stat) \ |
|
418 |
if (cond1) { \ |
|
419 |
if (cond2) { \ |
|
420 |
ARCSTAT_BUMP(arcstat_##stat1##_##stat2##_##stat); \ |
|
421 |
} else { \ |
|
422 |
ARCSTAT_BUMP(arcstat_##stat1##_##notstat2##_##stat); \ |
|
423 |
} \ |
|
424 |
} else { \ |
|
425 |
if (cond2) { \ |
|
426 |
ARCSTAT_BUMP(arcstat_##notstat1##_##stat2##_##stat); \ |
|
427 |
} else { \ |
|
428 |
ARCSTAT_BUMP(arcstat_##notstat1##_##notstat2##_##stat);\ |
|
429 |
} \ |
|
430 |
} |
|
789 | 431 |
|
3403 | 432 |
kstat_t *arc_ksp; |
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diff
changeset
|
433 |
static arc_state_t *arc_anon; |
3403 | 434 |
static arc_state_t *arc_mru; |
435 |
static arc_state_t *arc_mru_ghost; |
|
436 |
static arc_state_t *arc_mfu; |
|
437 |
static arc_state_t *arc_mfu_ghost; |
|
5450 | 438 |
static arc_state_t *arc_l2c_only; |
3403 | 439 |
|
440 |
/* |
|
441 |
* There are several ARC variables that are critical to export as kstats -- |
|
442 |
* but we don't want to have to grovel around in the kstat whenever we wish to |
|
443 |
* manipulate them. For these variables, we therefore define them to be in |
|
444 |
* terms of the statistic variable. This assures that we are not introducing |
|
445 |
* the possibility of inconsistency by having shadow copies of the variables, |
|
446 |
* while still allowing the code to be readable. |
|
447 |
*/ |
|
448 |
#define arc_size ARCSTAT(arcstat_size) /* actual total arc size */ |
|
449 |
#define arc_p ARCSTAT(arcstat_p) /* target size of MRU */ |
|
450 |
#define arc_c ARCSTAT(arcstat_c) /* target size of cache */ |
|
451 |
#define arc_c_min ARCSTAT(arcstat_c_min) /* min target cache size */ |
|
452 |
#define arc_c_max ARCSTAT(arcstat_c_max) /* max target cache size */ |
|
13958
1fd91513472c
3561 arc_meta_limit should be exposed via kstats
George Wilson <george.wilson@delphix.com>
parents:
13952
diff
changeset
|
453 |
#define arc_meta_limit ARCSTAT(arcstat_meta_limit) /* max size for metadata */ |
1fd91513472c
3561 arc_meta_limit should be exposed via kstats
George Wilson <george.wilson@delphix.com>
parents:
13952
diff
changeset
|
454 |
#define arc_meta_used ARCSTAT(arcstat_meta_used) /* size of metadata */ |
1fd91513472c
3561 arc_meta_limit should be exposed via kstats
George Wilson <george.wilson@delphix.com>
parents:
13952
diff
changeset
|
455 |
#define arc_meta_max ARCSTAT(arcstat_meta_max) /* max size of metadata */ |
3403 | 456 |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
457 |
#define L2ARC_IS_VALID_COMPRESS(_c_) \ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
458 |
((_c_) == ZIO_COMPRESS_LZ4 || (_c_) == ZIO_COMPRESS_EMPTY) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
459 |
|
3403 | 460 |
static int arc_no_grow; /* Don't try to grow cache size */ |
461 |
static uint64_t arc_tempreserve; |
|
9412
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
462 |
static uint64_t arc_loaned_bytes; |
789 | 463 |
|
5450 | 464 |
typedef struct l2arc_buf_hdr l2arc_buf_hdr_t; |
465 |
||
789 | 466 |
typedef struct arc_callback arc_callback_t; |
467 |
||
468 |
struct arc_callback { |
|
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
469 |
void *acb_private; |
789 | 470 |
arc_done_func_t *acb_done; |
471 |
arc_buf_t *acb_buf; |
|
472 |
zio_t *acb_zio_dummy; |
|
473 |
arc_callback_t *acb_next; |
|
474 |
}; |
|
475 |
||
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
476 |
typedef struct arc_write_callback arc_write_callback_t; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
477 |
|
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
478 |
struct arc_write_callback { |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
479 |
void *awcb_private; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
480 |
arc_done_func_t *awcb_ready; |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
481 |
arc_done_func_t *awcb_physdone; |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
482 |
arc_done_func_t *awcb_done; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
483 |
arc_buf_t *awcb_buf; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
484 |
}; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
485 |
|
789 | 486 |
struct arc_buf_hdr { |
487 |
/* protected by hash lock */ |
|
488 |
dva_t b_dva; |
|
489 |
uint64_t b_birth; |
|
490 |
uint64_t b_cksum0; |
|
491 |
||
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
492 |
kmutex_t b_freeze_lock; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
493 |
zio_cksum_t *b_freeze_cksum; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
494 |
void *b_thawed; |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
495 |
|
789 | 496 |
arc_buf_hdr_t *b_hash_next; |
497 |
arc_buf_t *b_buf; |
|
498 |
uint32_t b_flags; |
|
1544 | 499 |
uint32_t b_datacnt; |
789 | 500 |
|
3290 | 501 |
arc_callback_t *b_acb; |
789 | 502 |
kcondvar_t b_cv; |
3290 | 503 |
|
504 |
/* immutable */ |
|
505 |
arc_buf_contents_t b_type; |
|
506 |
uint64_t b_size; |
|
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
507 |
uint64_t b_spa; |
789 | 508 |
|
509 |
/* protected by arc state mutex */ |
|
510 |
arc_state_t *b_state; |
|
511 |
list_node_t b_arc_node; |
|
512 |
||
513 |
/* updated atomically */ |
|
514 |
clock_t b_arc_access; |
|
515 |
||
516 |
/* self protecting */ |
|
517 |
refcount_t b_refcnt; |
|
5450 | 518 |
|
519 |
l2arc_buf_hdr_t *b_l2hdr; |
|
520 |
list_node_t b_l2node; |
|
789 | 521 |
}; |
522 |
||
1544 | 523 |
static arc_buf_t *arc_eviction_list; |
524 |
static kmutex_t arc_eviction_mtx; |
|
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
525 |
static arc_buf_hdr_t arc_eviction_hdr; |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
526 |
static void arc_get_data_buf(arc_buf_t *buf); |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
527 |
static void arc_access(arc_buf_hdr_t *buf, kmutex_t *hash_lock); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
528 |
static int arc_evict_needed(arc_buf_contents_t type); |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
529 |
static void arc_evict_ghost(arc_state_t *state, uint64_t spa, int64_t bytes); |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
530 |
static void arc_buf_watch(arc_buf_t *buf); |
1544 | 531 |
|
10357
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
532 |
static boolean_t l2arc_write_eligible(uint64_t spa_guid, arc_buf_hdr_t *ab); |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
533 |
|
1544 | 534 |
#define GHOST_STATE(state) \ |
5450 | 535 |
((state) == arc_mru_ghost || (state) == arc_mfu_ghost || \ |
536 |
(state) == arc_l2c_only) |
|
1544 | 537 |
|
789 | 538 |
/* |
539 |
* Private ARC flags. These flags are private ARC only flags that will show up |
|
540 |
* in b_flags in the arc_hdr_buf_t. Some flags are publicly declared, and can |
|
541 |
* be passed in as arc_flags in things like arc_read. However, these flags |
|
542 |
* should never be passed and should only be set by ARC code. When adding new |
|
543 |
* public flags, make sure not to smash the private ones. |
|
544 |
*/ |
|
545 |
||
1544 | 546 |
#define ARC_IN_HASH_TABLE (1 << 9) /* this buffer is hashed */ |
789 | 547 |
#define ARC_IO_IN_PROGRESS (1 << 10) /* I/O in progress for buf */ |
548 |
#define ARC_IO_ERROR (1 << 11) /* I/O failed for buf */ |
|
549 |
#define ARC_FREED_IN_READ (1 << 12) /* buf freed while in read */ |
|
1544 | 550 |
#define ARC_BUF_AVAILABLE (1 << 13) /* block not in active use */ |
2391 | 551 |
#define ARC_INDIRECT (1 << 14) /* this is an indirect block */ |
5450 | 552 |
#define ARC_FREE_IN_PROGRESS (1 << 15) /* hdr about to be freed */ |
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
553 |
#define ARC_L2_WRITING (1 << 16) /* L2ARC write in progress */ |
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
554 |
#define ARC_L2_EVICTED (1 << 17) /* evicted during I/O */ |
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
555 |
#define ARC_L2_WRITE_HEAD (1 << 18) /* head of write list */ |
789 | 556 |
|
1544 | 557 |
#define HDR_IN_HASH_TABLE(hdr) ((hdr)->b_flags & ARC_IN_HASH_TABLE) |
789 | 558 |
#define HDR_IO_IN_PROGRESS(hdr) ((hdr)->b_flags & ARC_IO_IN_PROGRESS) |
559 |
#define HDR_IO_ERROR(hdr) ((hdr)->b_flags & ARC_IO_ERROR) |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
560 |
#define HDR_PREFETCH(hdr) ((hdr)->b_flags & ARC_PREFETCH) |
789 | 561 |
#define HDR_FREED_IN_READ(hdr) ((hdr)->b_flags & ARC_FREED_IN_READ) |
1544 | 562 |
#define HDR_BUF_AVAILABLE(hdr) ((hdr)->b_flags & ARC_BUF_AVAILABLE) |
5450 | 563 |
#define HDR_FREE_IN_PROGRESS(hdr) ((hdr)->b_flags & ARC_FREE_IN_PROGRESS) |
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
564 |
#define HDR_L2CACHE(hdr) ((hdr)->b_flags & ARC_L2CACHE) |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
565 |
#define HDR_L2_READING(hdr) ((hdr)->b_flags & ARC_IO_IN_PROGRESS && \ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
566 |
(hdr)->b_l2hdr != NULL) |
5450 | 567 |
#define HDR_L2_WRITING(hdr) ((hdr)->b_flags & ARC_L2_WRITING) |
568 |
#define HDR_L2_EVICTED(hdr) ((hdr)->b_flags & ARC_L2_EVICTED) |
|
569 |
#define HDR_L2_WRITE_HEAD(hdr) ((hdr)->b_flags & ARC_L2_WRITE_HEAD) |
|
789 | 570 |
|
571 |
/* |
|
6018
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
572 |
* Other sizes |
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
573 |
*/ |
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
574 |
|
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
575 |
#define HDR_SIZE ((int64_t)sizeof (arc_buf_hdr_t)) |
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
576 |
#define L2HDR_SIZE ((int64_t)sizeof (l2arc_buf_hdr_t)) |
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
577 |
|
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
578 |
/* |
789 | 579 |
* Hash table routines |
580 |
*/ |
|
581 |
||
582 |
#define HT_LOCK_PAD 64 |
|
583 |
||
584 |
struct ht_lock { |
|
585 |
kmutex_t ht_lock; |
|
586 |
#ifdef _KERNEL |
|
587 |
unsigned char pad[(HT_LOCK_PAD - sizeof (kmutex_t))]; |
|
588 |
#endif |
|
589 |
}; |
|
590 |
||
591 |
#define BUF_LOCKS 256 |
|
592 |
typedef struct buf_hash_table { |
|
593 |
uint64_t ht_mask; |
|
594 |
arc_buf_hdr_t **ht_table; |
|
595 |
struct ht_lock ht_locks[BUF_LOCKS]; |
|
596 |
} buf_hash_table_t; |
|
597 |
||
598 |
static buf_hash_table_t buf_hash_table; |
|
599 |
||
600 |
#define BUF_HASH_INDEX(spa, dva, birth) \ |
|
601 |
(buf_hash(spa, dva, birth) & buf_hash_table.ht_mask) |
|
602 |
#define BUF_HASH_LOCK_NTRY(idx) (buf_hash_table.ht_locks[idx & (BUF_LOCKS-1)]) |
|
603 |
#define BUF_HASH_LOCK(idx) (&(BUF_HASH_LOCK_NTRY(idx).ht_lock)) |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
604 |
#define HDR_LOCK(hdr) \ |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
605 |
(BUF_HASH_LOCK(BUF_HASH_INDEX(hdr->b_spa, &hdr->b_dva, hdr->b_birth))) |
789 | 606 |
|
607 |
uint64_t zfs_crc64_table[256]; |
|
608 |
||
5450 | 609 |
/* |
610 |
* Level 2 ARC |
|
611 |
*/ |
|
612 |
||
613 |
#define L2ARC_WRITE_SIZE (8 * 1024 * 1024) /* initial write max */ |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
614 |
#define L2ARC_HEADROOM 2 /* num of writes */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
615 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
616 |
* If we discover during ARC scan any buffers to be compressed, we boost |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
617 |
* our headroom for the next scanning cycle by this percentage multiple. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
618 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
619 |
#define L2ARC_HEADROOM_BOOST 200 |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
620 |
#define L2ARC_FEED_SECS 1 /* caching interval secs */ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
621 |
#define L2ARC_FEED_MIN_MS 200 /* min caching interval ms */ |
5450 | 622 |
|
623 |
#define l2arc_writes_sent ARCSTAT(arcstat_l2_writes_sent) |
|
624 |
#define l2arc_writes_done ARCSTAT(arcstat_l2_writes_done) |
|
625 |
||
14046
6a5a2f4a47db
3742 zfs comments need cleaner, more consistent style
Will Andrews <will@firepipe.net>
parents:
14045
diff
changeset
|
626 |
/* L2ARC Performance Tunables */ |
5450 | 627 |
uint64_t l2arc_write_max = L2ARC_WRITE_SIZE; /* default max write size */ |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
628 |
uint64_t l2arc_write_boost = L2ARC_WRITE_SIZE; /* extra write during warmup */ |
5450 | 629 |
uint64_t l2arc_headroom = L2ARC_HEADROOM; /* number of dev writes */ |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
630 |
uint64_t l2arc_headroom_boost = L2ARC_HEADROOM_BOOST; |
5450 | 631 |
uint64_t l2arc_feed_secs = L2ARC_FEED_SECS; /* interval seconds */ |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
632 |
uint64_t l2arc_feed_min_ms = L2ARC_FEED_MIN_MS; /* min interval milliseconds */ |
5450 | 633 |
boolean_t l2arc_noprefetch = B_TRUE; /* don't cache prefetch bufs */ |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
634 |
boolean_t l2arc_feed_again = B_TRUE; /* turbo warmup */ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
635 |
boolean_t l2arc_norw = B_TRUE; /* no reads during writes */ |
5450 | 636 |
|
637 |
/* |
|
638 |
* L2ARC Internals |
|
639 |
*/ |
|
640 |
typedef struct l2arc_dev { |
|
641 |
vdev_t *l2ad_vdev; /* vdev */ |
|
642 |
spa_t *l2ad_spa; /* spa */ |
|
643 |
uint64_t l2ad_hand; /* next write location */ |
|
644 |
uint64_t l2ad_start; /* first addr on device */ |
|
645 |
uint64_t l2ad_end; /* last addr on device */ |
|
646 |
uint64_t l2ad_evict; /* last addr eviction reached */ |
|
647 |
boolean_t l2ad_first; /* first sweep through */ |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
648 |
boolean_t l2ad_writing; /* currently writing */ |
5450 | 649 |
list_t *l2ad_buflist; /* buffer list */ |
650 |
list_node_t l2ad_node; /* device list node */ |
|
651 |
} l2arc_dev_t; |
|
652 |
||
653 |
static list_t L2ARC_dev_list; /* device list */ |
|
654 |
static list_t *l2arc_dev_list; /* device list pointer */ |
|
655 |
static kmutex_t l2arc_dev_mtx; /* device list mutex */ |
|
656 |
static l2arc_dev_t *l2arc_dev_last; /* last device used */ |
|
657 |
static kmutex_t l2arc_buflist_mtx; /* mutex for all buflists */ |
|
658 |
static list_t L2ARC_free_on_write; /* free after write buf list */ |
|
659 |
static list_t *l2arc_free_on_write; /* free after write list ptr */ |
|
660 |
static kmutex_t l2arc_free_on_write_mtx; /* mutex for list */ |
|
661 |
static uint64_t l2arc_ndev; /* number of devices */ |
|
662 |
||
663 |
typedef struct l2arc_read_callback { |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
664 |
arc_buf_t *l2rcb_buf; /* read buffer */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
665 |
spa_t *l2rcb_spa; /* spa */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
666 |
blkptr_t l2rcb_bp; /* original blkptr */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
667 |
zbookmark_t l2rcb_zb; /* original bookmark */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
668 |
int l2rcb_flags; /* original flags */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
669 |
enum zio_compress l2rcb_compress; /* applied compress */ |
5450 | 670 |
} l2arc_read_callback_t; |
671 |
||
672 |
typedef struct l2arc_write_callback { |
|
673 |
l2arc_dev_t *l2wcb_dev; /* device info */ |
|
674 |
arc_buf_hdr_t *l2wcb_head; /* head of write buflist */ |
|
675 |
} l2arc_write_callback_t; |
|
676 |
||
677 |
struct l2arc_buf_hdr { |
|
678 |
/* protected by arc_buf_hdr mutex */ |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
679 |
l2arc_dev_t *b_dev; /* L2ARC device */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
680 |
uint64_t b_daddr; /* disk address, offset byte */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
681 |
/* compression applied to buffer data */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
682 |
enum zio_compress b_compress; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
683 |
/* real alloc'd buffer size depending on b_compress applied */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
684 |
int b_asize; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
685 |
/* temporary buffer holder for in-flight compressed data */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
686 |
void *b_tmp_cdata; |
5450 | 687 |
}; |
688 |
||
689 |
typedef struct l2arc_data_free { |
|
690 |
/* protected by l2arc_free_on_write_mtx */ |
|
691 |
void *l2df_data; |
|
692 |
size_t l2df_size; |
|
693 |
void (*l2df_func)(void *, size_t); |
|
694 |
list_node_t l2df_list_node; |
|
695 |
} l2arc_data_free_t; |
|
696 |
||
697 |
static kmutex_t l2arc_feed_thr_lock; |
|
698 |
static kcondvar_t l2arc_feed_thr_cv; |
|
699 |
static uint8_t l2arc_thread_exit; |
|
700 |
||
701 |
static void l2arc_read_done(zio_t *zio); |
|
702 |
static void l2arc_hdr_stat_add(void); |
|
703 |
static void l2arc_hdr_stat_remove(void); |
|
704 |
||
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
705 |
static boolean_t l2arc_compress_buf(l2arc_buf_hdr_t *l2hdr); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
706 |
static void l2arc_decompress_zio(zio_t *zio, arc_buf_hdr_t *hdr, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
707 |
enum zio_compress c); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
708 |
static void l2arc_release_cdata_buf(arc_buf_hdr_t *ab); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
709 |
|
789 | 710 |
static uint64_t |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
711 |
buf_hash(uint64_t spa, const dva_t *dva, uint64_t birth) |
789 | 712 |
{ |
713 |
uint8_t *vdva = (uint8_t *)dva; |
|
714 |
uint64_t crc = -1ULL; |
|
715 |
int i; |
|
716 |
||
717 |
ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); |
|
718 |
||
719 |
for (i = 0; i < sizeof (dva_t); i++) |
|
720 |
crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ vdva[i]) & 0xFF]; |
|
721 |
||
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
722 |
crc ^= (spa>>8) ^ birth; |
789 | 723 |
|
724 |
return (crc); |
|
725 |
} |
|
726 |
||
727 |
#define BUF_EMPTY(buf) \ |
|
728 |
((buf)->b_dva.dva_word[0] == 0 && \ |
|
729 |
(buf)->b_dva.dva_word[1] == 0 && \ |
|
730 |
(buf)->b_birth == 0) |
|
731 |
||
732 |
#define BUF_EQUAL(spa, dva, birth, buf) \ |
|
733 |
((buf)->b_dva.dva_word[0] == (dva)->dva_word[0]) && \ |
|
734 |
((buf)->b_dva.dva_word[1] == (dva)->dva_word[1]) && \ |
|
735 |
((buf)->b_birth == birth) && ((buf)->b_spa == spa) |
|
736 |
||
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
737 |
static void |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
738 |
buf_discard_identity(arc_buf_hdr_t *hdr) |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
739 |
{ |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
740 |
hdr->b_dva.dva_word[0] = 0; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
741 |
hdr->b_dva.dva_word[1] = 0; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
742 |
hdr->b_birth = 0; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
743 |
hdr->b_cksum0 = 0; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
744 |
} |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
745 |
|
789 | 746 |
static arc_buf_hdr_t * |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
747 |
buf_hash_find(uint64_t spa, const dva_t *dva, uint64_t birth, kmutex_t **lockp) |
789 | 748 |
{ |
749 |
uint64_t idx = BUF_HASH_INDEX(spa, dva, birth); |
|
750 |
kmutex_t *hash_lock = BUF_HASH_LOCK(idx); |
|
751 |
arc_buf_hdr_t *buf; |
|
752 |
||
753 |
mutex_enter(hash_lock); |
|
754 |
for (buf = buf_hash_table.ht_table[idx]; buf != NULL; |
|
755 |
buf = buf->b_hash_next) { |
|
756 |
if (BUF_EQUAL(spa, dva, birth, buf)) { |
|
757 |
*lockp = hash_lock; |
|
758 |
return (buf); |
|
759 |
} |
|
760 |
} |
|
761 |
mutex_exit(hash_lock); |
|
762 |
*lockp = NULL; |
|
763 |
return (NULL); |
|
764 |
} |
|
765 |
||
766 |
/* |
|
767 |
* Insert an entry into the hash table. If there is already an element |
|
768 |
* equal to elem in the hash table, then the already existing element |
|
769 |
* will be returned and the new element will not be inserted. |
|
770 |
* Otherwise returns NULL. |
|
771 |
*/ |
|
772 |
static arc_buf_hdr_t * |
|
773 |
buf_hash_insert(arc_buf_hdr_t *buf, kmutex_t **lockp) |
|
774 |
{ |
|
775 |
uint64_t idx = BUF_HASH_INDEX(buf->b_spa, &buf->b_dva, buf->b_birth); |
|
776 |
kmutex_t *hash_lock = BUF_HASH_LOCK(idx); |
|
777 |
arc_buf_hdr_t *fbuf; |
|
3403 | 778 |
uint32_t i; |
789 | 779 |
|
1544 | 780 |
ASSERT(!HDR_IN_HASH_TABLE(buf)); |
789 | 781 |
*lockp = hash_lock; |
782 |
mutex_enter(hash_lock); |
|
783 |
for (fbuf = buf_hash_table.ht_table[idx], i = 0; fbuf != NULL; |
|
784 |
fbuf = fbuf->b_hash_next, i++) { |
|
785 |
if (BUF_EQUAL(buf->b_spa, &buf->b_dva, buf->b_birth, fbuf)) |
|
786 |
return (fbuf); |
|
787 |
} |
|
788 |
||
789 |
buf->b_hash_next = buf_hash_table.ht_table[idx]; |
|
790 |
buf_hash_table.ht_table[idx] = buf; |
|
1544 | 791 |
buf->b_flags |= ARC_IN_HASH_TABLE; |
789 | 792 |
|
793 |
/* collect some hash table performance data */ |
|
794 |
if (i > 0) { |
|
3403 | 795 |
ARCSTAT_BUMP(arcstat_hash_collisions); |
789 | 796 |
if (i == 1) |
3403 | 797 |
ARCSTAT_BUMP(arcstat_hash_chains); |
798 |
||
799 |
ARCSTAT_MAX(arcstat_hash_chain_max, i); |
|
789 | 800 |
} |
3403 | 801 |
|
802 |
ARCSTAT_BUMP(arcstat_hash_elements); |
|
803 |
ARCSTAT_MAXSTAT(arcstat_hash_elements); |
|
789 | 804 |
|
805 |
return (NULL); |
|
806 |
} |
|
807 |
||
808 |
static void |
|
809 |
buf_hash_remove(arc_buf_hdr_t *buf) |
|
810 |
{ |
|
811 |
arc_buf_hdr_t *fbuf, **bufp; |
|
812 |
uint64_t idx = BUF_HASH_INDEX(buf->b_spa, &buf->b_dva, buf->b_birth); |
|
813 |
||
814 |
ASSERT(MUTEX_HELD(BUF_HASH_LOCK(idx))); |
|
1544 | 815 |
ASSERT(HDR_IN_HASH_TABLE(buf)); |
789 | 816 |
|
817 |
bufp = &buf_hash_table.ht_table[idx]; |
|
818 |
while ((fbuf = *bufp) != buf) { |
|
819 |
ASSERT(fbuf != NULL); |
|
820 |
bufp = &fbuf->b_hash_next; |
|
821 |
} |
|
822 |
*bufp = buf->b_hash_next; |
|
823 |
buf->b_hash_next = NULL; |
|
1544 | 824 |
buf->b_flags &= ~ARC_IN_HASH_TABLE; |
789 | 825 |
|
826 |
/* collect some hash table performance data */ |
|
3403 | 827 |
ARCSTAT_BUMPDOWN(arcstat_hash_elements); |
828 |
||
789 | 829 |
if (buf_hash_table.ht_table[idx] && |
830 |
buf_hash_table.ht_table[idx]->b_hash_next == NULL) |
|
3403 | 831 |
ARCSTAT_BUMPDOWN(arcstat_hash_chains); |
789 | 832 |
} |
833 |
||
834 |
/* |
|
835 |
* Global data structures and functions for the buf kmem cache. |
|
836 |
*/ |
|
837 |
static kmem_cache_t *hdr_cache; |
|
838 |
static kmem_cache_t *buf_cache; |
|
839 |
||
840 |
static void |
|
841 |
buf_fini(void) |
|
842 |
{ |
|
843 |
int i; |
|
844 |
||
845 |
kmem_free(buf_hash_table.ht_table, |
|
846 |
(buf_hash_table.ht_mask + 1) * sizeof (void *)); |
|
847 |
for (i = 0; i < BUF_LOCKS; i++) |
|
848 |
mutex_destroy(&buf_hash_table.ht_locks[i].ht_lock); |
|
849 |
kmem_cache_destroy(hdr_cache); |
|
850 |
kmem_cache_destroy(buf_cache); |
|
851 |
} |
|
852 |
||
853 |
/* |
|
854 |
* Constructor callback - called when the cache is empty |
|
855 |
* and a new buf is requested. |
|
856 |
*/ |
|
857 |
/* ARGSUSED */ |
|
858 |
static int |
|
859 |
hdr_cons(void *vbuf, void *unused, int kmflag) |
|
860 |
{ |
|
861 |
arc_buf_hdr_t *buf = vbuf; |
|
862 |
||
863 |
bzero(buf, sizeof (arc_buf_hdr_t)); |
|
864 |
refcount_create(&buf->b_refcnt); |
|
865 |
cv_init(&buf->b_cv, NULL, CV_DEFAULT, NULL); |
|
4831
41ec732c6d9f
6584470 zdb needs to initialize the bpl_lock mutex
gw25295
parents:
4709
diff
changeset
|
866 |
mutex_init(&buf->b_freeze_lock, NULL, MUTEX_DEFAULT, NULL); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
867 |
arc_space_consume(sizeof (arc_buf_hdr_t), ARC_SPACE_HDRS); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
868 |
|
789 | 869 |
return (0); |
870 |
} |
|
871 |
||
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
872 |
/* ARGSUSED */ |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
873 |
static int |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
874 |
buf_cons(void *vbuf, void *unused, int kmflag) |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
875 |
{ |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
876 |
arc_buf_t *buf = vbuf; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
877 |
|
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
878 |
bzero(buf, sizeof (arc_buf_t)); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
879 |
mutex_init(&buf->b_evict_lock, NULL, MUTEX_DEFAULT, NULL); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
880 |
arc_space_consume(sizeof (arc_buf_t), ARC_SPACE_HDRS); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
881 |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
882 |
return (0); |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
883 |
} |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
884 |
|
789 | 885 |
/* |
886 |
* Destructor callback - called when a cached buf is |
|
887 |
* no longer required. |
|
888 |
*/ |
|
889 |
/* ARGSUSED */ |
|
890 |
static void |
|
891 |
hdr_dest(void *vbuf, void *unused) |
|
892 |
{ |
|
893 |
arc_buf_hdr_t *buf = vbuf; |
|
894 |
||
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
895 |
ASSERT(BUF_EMPTY(buf)); |
789 | 896 |
refcount_destroy(&buf->b_refcnt); |
897 |
cv_destroy(&buf->b_cv); |
|
4831
41ec732c6d9f
6584470 zdb needs to initialize the bpl_lock mutex
gw25295
parents:
4709
diff
changeset
|
898 |
mutex_destroy(&buf->b_freeze_lock); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
899 |
arc_space_return(sizeof (arc_buf_hdr_t), ARC_SPACE_HDRS); |
789 | 900 |
} |
901 |
||
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
902 |
/* ARGSUSED */ |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
903 |
static void |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
904 |
buf_dest(void *vbuf, void *unused) |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
905 |
{ |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
906 |
arc_buf_t *buf = vbuf; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
907 |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
908 |
mutex_destroy(&buf->b_evict_lock); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
909 |
arc_space_return(sizeof (arc_buf_t), ARC_SPACE_HDRS); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
910 |
} |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
911 |
|
789 | 912 |
/* |
913 |
* Reclaim callback -- invoked when memory is low. |
|
914 |
*/ |
|
915 |
/* ARGSUSED */ |
|
916 |
static void |
|
917 |
hdr_recl(void *unused) |
|
918 |
{ |
|
919 |
dprintf("hdr_recl called\n"); |
|
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
920 |
/* |
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
921 |
* umem calls the reclaim func when we destroy the buf cache, |
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
922 |
* which is after we do arc_fini(). |
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
923 |
*/ |
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
924 |
if (!arc_dead) |
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
925 |
cv_signal(&arc_reclaim_thr_cv); |
789 | 926 |
} |
927 |
||
928 |
static void |
|
929 |
buf_init(void) |
|
930 |
{ |
|
931 |
uint64_t *ct; |
|
1544 | 932 |
uint64_t hsize = 1ULL << 12; |
789 | 933 |
int i, j; |
934 |
||
935 |
/* |
|
936 |
* The hash table is big enough to fill all of physical memory |
|
1544 | 937 |
* with an average 64K block size. The table will take up |
938 |
* totalmem*sizeof(void*)/64K (eg. 128KB/GB with 8-byte pointers). |
|
789 | 939 |
*/ |
1544 | 940 |
while (hsize * 65536 < physmem * PAGESIZE) |
789 | 941 |
hsize <<= 1; |
1544 | 942 |
retry: |
789 | 943 |
buf_hash_table.ht_mask = hsize - 1; |
1544 | 944 |
buf_hash_table.ht_table = |
945 |
kmem_zalloc(hsize * sizeof (void*), KM_NOSLEEP); |
|
946 |
if (buf_hash_table.ht_table == NULL) { |
|
947 |
ASSERT(hsize > (1ULL << 8)); |
|
948 |
hsize >>= 1; |
|
949 |
goto retry; |
|
950 |
} |
|
789 | 951 |
|
952 |
hdr_cache = kmem_cache_create("arc_buf_hdr_t", sizeof (arc_buf_hdr_t), |
|
953 |
0, hdr_cons, hdr_dest, hdr_recl, NULL, NULL, 0); |
|
954 |
buf_cache = kmem_cache_create("arc_buf_t", sizeof (arc_buf_t), |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
955 |
0, buf_cons, buf_dest, NULL, NULL, NULL, 0); |
789 | 956 |
|
957 |
for (i = 0; i < 256; i++) |
|
958 |
for (ct = zfs_crc64_table + i, *ct = i, j = 8; j > 0; j--) |
|
959 |
*ct = (*ct >> 1) ^ (-(*ct & 1) & ZFS_CRC64_POLY); |
|
960 |
||
961 |
for (i = 0; i < BUF_LOCKS; i++) { |
|
962 |
mutex_init(&buf_hash_table.ht_locks[i].ht_lock, |
|
963 |
NULL, MUTEX_DEFAULT, NULL); |
|
964 |
} |
|
965 |
} |
|
966 |
||
967 |
#define ARC_MINTIME (hz>>4) /* 62 ms */ |
|
968 |
||
969 |
static void |
|
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
970 |
arc_cksum_verify(arc_buf_t *buf) |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
971 |
{ |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
972 |
zio_cksum_t zc; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
973 |
|
3312 | 974 |
if (!(zfs_flags & ZFS_DEBUG_MODIFY)) |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
975 |
return; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
976 |
|
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
977 |
mutex_enter(&buf->b_hdr->b_freeze_lock); |
3265
967e0fca6143
6463140 zfs recv with a snapshot name that has 2 @@ in a row succeeds
ahrens
parents:
3158
diff
changeset
|
978 |
if (buf->b_hdr->b_freeze_cksum == NULL || |
967e0fca6143
6463140 zfs recv with a snapshot name that has 2 @@ in a row succeeds
ahrens
parents:
3158
diff
changeset
|
979 |
(buf->b_hdr->b_flags & ARC_IO_ERROR)) { |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
980 |
mutex_exit(&buf->b_hdr->b_freeze_lock); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
981 |
return; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
982 |
} |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
983 |
fletcher_2_native(buf->b_data, buf->b_hdr->b_size, &zc); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
984 |
if (!ZIO_CHECKSUM_EQUAL(*buf->b_hdr->b_freeze_cksum, zc)) |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
985 |
panic("buffer modified while frozen!"); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
986 |
mutex_exit(&buf->b_hdr->b_freeze_lock); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
987 |
} |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
988 |
|
5450 | 989 |
static int |
990 |
arc_cksum_equal(arc_buf_t *buf) |
|
991 |
{ |
|
992 |
zio_cksum_t zc; |
|
993 |
int equal; |
|
994 |
||
995 |
mutex_enter(&buf->b_hdr->b_freeze_lock); |
|
996 |
fletcher_2_native(buf->b_data, buf->b_hdr->b_size, &zc); |
|
997 |
equal = ZIO_CHECKSUM_EQUAL(*buf->b_hdr->b_freeze_cksum, zc); |
|
998 |
mutex_exit(&buf->b_hdr->b_freeze_lock); |
|
999 |
||
1000 |
return (equal); |
|
1001 |
} |
|
1002 |
||
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1003 |
static void |
5450 | 1004 |
arc_cksum_compute(arc_buf_t *buf, boolean_t force) |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1005 |
{ |
5450 | 1006 |
if (!force && !(zfs_flags & ZFS_DEBUG_MODIFY)) |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1007 |
return; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1008 |
|
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1009 |
mutex_enter(&buf->b_hdr->b_freeze_lock); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1010 |
if (buf->b_hdr->b_freeze_cksum != NULL) { |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1011 |
mutex_exit(&buf->b_hdr->b_freeze_lock); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1012 |
return; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1013 |
} |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1014 |
buf->b_hdr->b_freeze_cksum = kmem_alloc(sizeof (zio_cksum_t), KM_SLEEP); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1015 |
fletcher_2_native(buf->b_data, buf->b_hdr->b_size, |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1016 |
buf->b_hdr->b_freeze_cksum); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1017 |
mutex_exit(&buf->b_hdr->b_freeze_lock); |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1018 |
arc_buf_watch(buf); |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1019 |
} |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1020 |
|
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1021 |
#ifndef _KERNEL |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1022 |
typedef struct procctl { |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1023 |
long cmd; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1024 |
prwatch_t prwatch; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1025 |
} procctl_t; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1026 |
#endif |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1027 |
|
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1028 |
/* ARGSUSED */ |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1029 |
static void |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1030 |
arc_buf_unwatch(arc_buf_t *buf) |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1031 |
{ |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1032 |
#ifndef _KERNEL |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1033 |
if (arc_watch) { |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1034 |
int result; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1035 |
procctl_t ctl; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1036 |
ctl.cmd = PCWATCH; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1037 |
ctl.prwatch.pr_vaddr = (uintptr_t)buf->b_data; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1038 |
ctl.prwatch.pr_size = 0; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1039 |
ctl.prwatch.pr_wflags = 0; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1040 |
result = write(arc_procfd, &ctl, sizeof (ctl)); |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1041 |
ASSERT3U(result, ==, sizeof (ctl)); |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1042 |
} |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1043 |
#endif |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1044 |
} |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1045 |
|
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1046 |
/* ARGSUSED */ |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1047 |
static void |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1048 |
arc_buf_watch(arc_buf_t *buf) |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1049 |
{ |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1050 |
#ifndef _KERNEL |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1051 |
if (arc_watch) { |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1052 |
int result; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1053 |
procctl_t ctl; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1054 |
ctl.cmd = PCWATCH; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1055 |
ctl.prwatch.pr_vaddr = (uintptr_t)buf->b_data; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1056 |
ctl.prwatch.pr_size = buf->b_hdr->b_size; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1057 |
ctl.prwatch.pr_wflags = WA_WRITE; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1058 |
result = write(arc_procfd, &ctl, sizeof (ctl)); |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1059 |
ASSERT3U(result, ==, sizeof (ctl)); |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1060 |
} |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1061 |
#endif |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1062 |
} |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1063 |
|
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1064 |
void |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1065 |
arc_buf_thaw(arc_buf_t *buf) |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1066 |
{ |
5450 | 1067 |
if (zfs_flags & ZFS_DEBUG_MODIFY) { |
1068 |
if (buf->b_hdr->b_state != arc_anon) |
|
1069 |
panic("modifying non-anon buffer!"); |
|
1070 |
if (buf->b_hdr->b_flags & ARC_IO_IN_PROGRESS) |
|
1071 |
panic("modifying buffer while i/o in progress!"); |
|
1072 |
arc_cksum_verify(buf); |
|
1073 |
} |
|
1074 |
||
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1075 |
mutex_enter(&buf->b_hdr->b_freeze_lock); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1076 |
if (buf->b_hdr->b_freeze_cksum != NULL) { |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1077 |
kmem_free(buf->b_hdr->b_freeze_cksum, sizeof (zio_cksum_t)); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1078 |
buf->b_hdr->b_freeze_cksum = NULL; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1079 |
} |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1080 |
|
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1081 |
if (zfs_flags & ZFS_DEBUG_MODIFY) { |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1082 |
if (buf->b_hdr->b_thawed) |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1083 |
kmem_free(buf->b_hdr->b_thawed, 1); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1084 |
buf->b_hdr->b_thawed = kmem_alloc(1, KM_SLEEP); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1085 |
} |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1086 |
|
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1087 |
mutex_exit(&buf->b_hdr->b_freeze_lock); |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1088 |
|
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1089 |
arc_buf_unwatch(buf); |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1090 |
} |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1091 |
|
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1092 |
void |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1093 |
arc_buf_freeze(arc_buf_t *buf) |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1094 |
{ |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1095 |
kmutex_t *hash_lock; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1096 |
|
3312 | 1097 |
if (!(zfs_flags & ZFS_DEBUG_MODIFY)) |
1098 |
return; |
|
1099 |
||
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1100 |
hash_lock = HDR_LOCK(buf->b_hdr); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1101 |
mutex_enter(hash_lock); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1102 |
|
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1103 |
ASSERT(buf->b_hdr->b_freeze_cksum != NULL || |
3403 | 1104 |
buf->b_hdr->b_state == arc_anon); |
5450 | 1105 |
arc_cksum_compute(buf, B_FALSE); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1106 |
mutex_exit(hash_lock); |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1107 |
|
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1108 |
} |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1109 |
|
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1110 |
static void |
789 | 1111 |
add_reference(arc_buf_hdr_t *ab, kmutex_t *hash_lock, void *tag) |
1112 |
{ |
|
1113 |
ASSERT(MUTEX_HELD(hash_lock)); |
|
1114 |
||
1115 |
if ((refcount_add(&ab->b_refcnt, tag) == 1) && |
|
3403 | 1116 |
(ab->b_state != arc_anon)) { |
3700
3a7e0afcf1b4
6523936 BAD TRAP: type=8 (#df Double fault) rp=fec266f8 addr=0
ek110237
parents:
3552
diff
changeset
|
1117 |
uint64_t delta = ab->b_size * ab->b_datacnt; |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1118 |
list_t *list = &ab->b_state->arcs_list[ab->b_type]; |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1119 |
uint64_t *size = &ab->b_state->arcs_lsize[ab->b_type]; |
789 | 1120 |
|
3403 | 1121 |
ASSERT(!MUTEX_HELD(&ab->b_state->arcs_mtx)); |
1122 |
mutex_enter(&ab->b_state->arcs_mtx); |
|
789 | 1123 |
ASSERT(list_link_active(&ab->b_arc_node)); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1124 |
list_remove(list, ab); |
1544 | 1125 |
if (GHOST_STATE(ab->b_state)) { |
13805
e3a9ae14a119
3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
Madhav Suresh <madhav.suresh@delphix.com>
parents:
13790
diff
changeset
|
1126 |
ASSERT0(ab->b_datacnt); |
1544 | 1127 |
ASSERT3P(ab->b_buf, ==, NULL); |
1128 |
delta = ab->b_size; |
|
1129 |
} |
|
1130 |
ASSERT(delta > 0); |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1131 |
ASSERT3U(*size, >=, delta); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1132 |
atomic_add_64(size, -delta); |
3403 | 1133 |
mutex_exit(&ab->b_state->arcs_mtx); |
7046
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
1134 |
/* remove the prefetch flag if we get a reference */ |
2391 | 1135 |
if (ab->b_flags & ARC_PREFETCH) |
1136 |
ab->b_flags &= ~ARC_PREFETCH; |
|
789 | 1137 |
} |
1138 |
} |
|
1139 |
||
1140 |
static int |
|
1141 |
remove_reference(arc_buf_hdr_t *ab, kmutex_t *hash_lock, void *tag) |
|
1142 |
{ |
|
1143 |
int cnt; |
|
3403 | 1144 |
arc_state_t *state = ab->b_state; |
789 | 1145 |
|
3403 | 1146 |
ASSERT(state == arc_anon || MUTEX_HELD(hash_lock)); |
1147 |
ASSERT(!GHOST_STATE(state)); |
|
789 | 1148 |
|
1149 |
if (((cnt = refcount_remove(&ab->b_refcnt, tag)) == 0) && |
|
3403 | 1150 |
(state != arc_anon)) { |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1151 |
uint64_t *size = &state->arcs_lsize[ab->b_type]; |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1152 |
|
3403 | 1153 |
ASSERT(!MUTEX_HELD(&state->arcs_mtx)); |
1154 |
mutex_enter(&state->arcs_mtx); |
|
789 | 1155 |
ASSERT(!list_link_active(&ab->b_arc_node)); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1156 |
list_insert_head(&state->arcs_list[ab->b_type], ab); |
1544 | 1157 |
ASSERT(ab->b_datacnt > 0); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1158 |
atomic_add_64(size, ab->b_size * ab->b_datacnt); |
3403 | 1159 |
mutex_exit(&state->arcs_mtx); |
789 | 1160 |
} |
1161 |
return (cnt); |
|
1162 |
} |
|
1163 |
||
1164 |
/* |
|
1165 |
* Move the supplied buffer to the indicated state. The mutex |
|
1166 |
* for the buffer must be held by the caller. |
|
1167 |
*/ |
|
1168 |
static void |
|
1544 | 1169 |
arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *ab, kmutex_t *hash_lock) |
789 | 1170 |
{ |
1544 | 1171 |
arc_state_t *old_state = ab->b_state; |
3700
3a7e0afcf1b4
6523936 BAD TRAP: type=8 (#df Double fault) rp=fec266f8 addr=0
ek110237
parents:
3552
diff
changeset
|
1172 |
int64_t refcnt = refcount_count(&ab->b_refcnt); |
3a7e0afcf1b4
6523936 BAD TRAP: type=8 (#df Double fault) rp=fec266f8 addr=0
ek110237
parents:
3552
diff
changeset
|
1173 |
uint64_t from_delta, to_delta; |
789 | 1174 |
|
1175 |
ASSERT(MUTEX_HELD(hash_lock)); |
|
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1176 |
ASSERT3P(new_state, !=, old_state); |
1544 | 1177 |
ASSERT(refcnt == 0 || ab->b_datacnt > 0); |
1178 |
ASSERT(ab->b_datacnt == 0 || !GHOST_STATE(new_state)); |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1179 |
ASSERT(ab->b_datacnt <= 1 || old_state != arc_anon); |
1544 | 1180 |
|
1181 |
from_delta = to_delta = ab->b_datacnt * ab->b_size; |
|
789 | 1182 |
|
1183 |
/* |
|
1184 |
* If this buffer is evictable, transfer it from the |
|
1185 |
* old state list to the new state list. |
|
1186 |
*/ |
|
1544 | 1187 |
if (refcnt == 0) { |
3403 | 1188 |
if (old_state != arc_anon) { |
1189 |
int use_mutex = !MUTEX_HELD(&old_state->arcs_mtx); |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1190 |
uint64_t *size = &old_state->arcs_lsize[ab->b_type]; |
1544 | 1191 |
|
1192 |
if (use_mutex) |
|
3403 | 1193 |
mutex_enter(&old_state->arcs_mtx); |
1544 | 1194 |
|
1195 |
ASSERT(list_link_active(&ab->b_arc_node)); |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1196 |
list_remove(&old_state->arcs_list[ab->b_type], ab); |
789 | 1197 |
|
2391 | 1198 |
/* |
1199 |
* If prefetching out of the ghost cache, |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1200 |
* we will have a non-zero datacnt. |
2391 | 1201 |
*/ |
1202 |
if (GHOST_STATE(old_state) && ab->b_datacnt == 0) { |
|
1203 |
/* ghost elements have a ghost size */ |
|
1544 | 1204 |
ASSERT(ab->b_buf == NULL); |
1205 |
from_delta = ab->b_size; |
|
789 | 1206 |
} |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1207 |
ASSERT3U(*size, >=, from_delta); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1208 |
atomic_add_64(size, -from_delta); |
1544 | 1209 |
|
1210 |
if (use_mutex) |
|
3403 | 1211 |
mutex_exit(&old_state->arcs_mtx); |
789 | 1212 |
} |
3403 | 1213 |
if (new_state != arc_anon) { |
1214 |
int use_mutex = !MUTEX_HELD(&new_state->arcs_mtx); |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1215 |
uint64_t *size = &new_state->arcs_lsize[ab->b_type]; |
789 | 1216 |
|
1544 | 1217 |
if (use_mutex) |
3403 | 1218 |
mutex_enter(&new_state->arcs_mtx); |
1544 | 1219 |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1220 |
list_insert_head(&new_state->arcs_list[ab->b_type], ab); |
1544 | 1221 |
|
1222 |
/* ghost elements have a ghost size */ |
|
1223 |
if (GHOST_STATE(new_state)) { |
|
1224 |
ASSERT(ab->b_datacnt == 0); |
|
1225 |
ASSERT(ab->b_buf == NULL); |
|
1226 |
to_delta = ab->b_size; |
|
1227 |
} |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1228 |
atomic_add_64(size, to_delta); |
1544 | 1229 |
|
1230 |
if (use_mutex) |
|
3403 | 1231 |
mutex_exit(&new_state->arcs_mtx); |
789 | 1232 |
} |
1233 |
} |
|
1234 |
||
1235 |
ASSERT(!BUF_EMPTY(ab)); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1236 |
if (new_state == arc_anon && HDR_IN_HASH_TABLE(ab)) |
789 | 1237 |
buf_hash_remove(ab); |
1238 |
||
1544 | 1239 |
/* adjust state sizes */ |
1240 |
if (to_delta) |
|
3403 | 1241 |
atomic_add_64(&new_state->arcs_size, to_delta); |
1544 | 1242 |
if (from_delta) { |
3403 | 1243 |
ASSERT3U(old_state->arcs_size, >=, from_delta); |
1244 |
atomic_add_64(&old_state->arcs_size, -from_delta); |
|
789 | 1245 |
} |
1246 |
ab->b_state = new_state; |
|
5450 | 1247 |
|
1248 |
/* adjust l2arc hdr stats */ |
|
1249 |
if (new_state == arc_l2c_only) |
|
1250 |
l2arc_hdr_stat_add(); |
|
1251 |
else if (old_state == arc_l2c_only) |
|
1252 |
l2arc_hdr_stat_remove(); |
|
789 | 1253 |
} |
1254 |
||
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1255 |
void |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1256 |
arc_space_consume(uint64_t space, arc_space_type_t type) |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1257 |
{ |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1258 |
ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1259 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1260 |
switch (type) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1261 |
case ARC_SPACE_DATA: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1262 |
ARCSTAT_INCR(arcstat_data_size, space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1263 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1264 |
case ARC_SPACE_OTHER: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1265 |
ARCSTAT_INCR(arcstat_other_size, space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1266 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1267 |
case ARC_SPACE_HDRS: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1268 |
ARCSTAT_INCR(arcstat_hdr_size, space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1269 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1270 |
case ARC_SPACE_L2HDRS: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1271 |
ARCSTAT_INCR(arcstat_l2_hdr_size, space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1272 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1273 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1274 |
|
13958
1fd91513472c
3561 arc_meta_limit should be exposed via kstats
George Wilson <george.wilson@delphix.com>
parents:
13952
diff
changeset
|
1275 |
ARCSTAT_INCR(arcstat_meta_used, space); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1276 |
atomic_add_64(&arc_size, space); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1277 |
} |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1278 |
|
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1279 |
void |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1280 |
arc_space_return(uint64_t space, arc_space_type_t type) |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1281 |
{ |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1282 |
ASSERT(type >= 0 && type < ARC_SPACE_NUMTYPES); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1283 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1284 |
switch (type) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1285 |
case ARC_SPACE_DATA: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1286 |
ARCSTAT_INCR(arcstat_data_size, -space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1287 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1288 |
case ARC_SPACE_OTHER: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1289 |
ARCSTAT_INCR(arcstat_other_size, -space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1290 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1291 |
case ARC_SPACE_HDRS: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1292 |
ARCSTAT_INCR(arcstat_hdr_size, -space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1293 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1294 |
case ARC_SPACE_L2HDRS: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1295 |
ARCSTAT_INCR(arcstat_l2_hdr_size, -space); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1296 |
break; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1297 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1298 |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1299 |
ASSERT(arc_meta_used >= space); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1300 |
if (arc_meta_max < arc_meta_used) |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1301 |
arc_meta_max = arc_meta_used; |
13958
1fd91513472c
3561 arc_meta_limit should be exposed via kstats
George Wilson <george.wilson@delphix.com>
parents:
13952
diff
changeset
|
1302 |
ARCSTAT_INCR(arcstat_meta_used, -space); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1303 |
ASSERT(arc_size >= space); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1304 |
atomic_add_64(&arc_size, -space); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1305 |
} |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1306 |
|
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1307 |
void * |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1308 |
arc_data_buf_alloc(uint64_t size) |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1309 |
{ |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1310 |
if (arc_evict_needed(ARC_BUFC_DATA)) |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1311 |
cv_signal(&arc_reclaim_thr_cv); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1312 |
atomic_add_64(&arc_size, size); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1313 |
return (zio_data_buf_alloc(size)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1314 |
} |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1315 |
|
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1316 |
void |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1317 |
arc_data_buf_free(void *buf, uint64_t size) |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1318 |
{ |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1319 |
zio_data_buf_free(buf, size); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1320 |
ASSERT(arc_size >= size); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1321 |
atomic_add_64(&arc_size, -size); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1322 |
} |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1323 |
|
789 | 1324 |
arc_buf_t * |
3290 | 1325 |
arc_buf_alloc(spa_t *spa, int size, void *tag, arc_buf_contents_t type) |
789 | 1326 |
{ |
1327 |
arc_buf_hdr_t *hdr; |
|
1328 |
arc_buf_t *buf; |
|
1329 |
||
1330 |
ASSERT3U(size, >, 0); |
|
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
1331 |
hdr = kmem_cache_alloc(hdr_cache, KM_PUSHPAGE); |
789 | 1332 |
ASSERT(BUF_EMPTY(hdr)); |
1333 |
hdr->b_size = size; |
|
3290 | 1334 |
hdr->b_type = type; |
13514
417c34452f03
1748 desire support for reguid in zfs
Garrett D'Amore <garrett@nexenta.com>
parents:
13061
diff
changeset
|
1335 |
hdr->b_spa = spa_load_guid(spa); |
3403 | 1336 |
hdr->b_state = arc_anon; |
789 | 1337 |
hdr->b_arc_access = 0; |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
1338 |
buf = kmem_cache_alloc(buf_cache, KM_PUSHPAGE); |
789 | 1339 |
buf->b_hdr = hdr; |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1340 |
buf->b_data = NULL; |
1544 | 1341 |
buf->b_efunc = NULL; |
1342 |
buf->b_private = NULL; |
|
789 | 1343 |
buf->b_next = NULL; |
1344 |
hdr->b_buf = buf; |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1345 |
arc_get_data_buf(buf); |
1544 | 1346 |
hdr->b_datacnt = 1; |
789 | 1347 |
hdr->b_flags = 0; |
1348 |
ASSERT(refcount_is_zero(&hdr->b_refcnt)); |
|
1349 |
(void) refcount_add(&hdr->b_refcnt, tag); |
|
1350 |
||
1351 |
return (buf); |
|
1352 |
} |
|
1353 |
||
9412
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1354 |
static char *arc_onloan_tag = "onloan"; |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1355 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1356 |
/* |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1357 |
* Loan out an anonymous arc buffer. Loaned buffers are not counted as in |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1358 |
* flight data by arc_tempreserve_space() until they are "returned". Loaned |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1359 |
* buffers must be returned to the arc before they can be used by the DMU or |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1360 |
* freed. |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1361 |
*/ |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1362 |
arc_buf_t * |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1363 |
arc_loan_buf(spa_t *spa, int size) |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1364 |
{ |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1365 |
arc_buf_t *buf; |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1366 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1367 |
buf = arc_buf_alloc(spa, size, arc_onloan_tag, ARC_BUFC_DATA); |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1368 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1369 |
atomic_add_64(&arc_loaned_bytes, size); |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1370 |
return (buf); |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1371 |
} |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1372 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1373 |
/* |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1374 |
* Return a loaned arc buffer to the arc. |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1375 |
*/ |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1376 |
void |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1377 |
arc_return_buf(arc_buf_t *buf, void *tag) |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1378 |
{ |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1379 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1380 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1381 |
ASSERT(buf->b_data != NULL); |
11539
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1382 |
(void) refcount_add(&hdr->b_refcnt, tag); |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1383 |
(void) refcount_remove(&hdr->b_refcnt, arc_onloan_tag); |
9412
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1384 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1385 |
atomic_add_64(&arc_loaned_bytes, -hdr->b_size); |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1386 |
} |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
1387 |
|
11539
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1388 |
/* Detach an arc_buf from a dbuf (tag) */ |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1389 |
void |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1390 |
arc_loan_inuse_buf(arc_buf_t *buf, void *tag) |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1391 |
{ |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1392 |
arc_buf_hdr_t *hdr; |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1393 |
|
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1394 |
ASSERT(buf->b_data != NULL); |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1395 |
hdr = buf->b_hdr; |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1396 |
(void) refcount_add(&hdr->b_refcnt, arc_onloan_tag); |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1397 |
(void) refcount_remove(&hdr->b_refcnt, tag); |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1398 |
buf->b_efunc = NULL; |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1399 |
buf->b_private = NULL; |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1400 |
|
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1401 |
atomic_add_64(&arc_loaned_bytes, hdr->b_size); |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1402 |
} |
10d35fc3d7fd
6873106 Need a mechanism to share buffers between fs modules
chunli zhang - Sun Microsystems - Irvine United States <Chunli.Zhang@Sun.COM>
parents:
11066
diff
changeset
|
1403 |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1404 |
static arc_buf_t * |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1405 |
arc_buf_clone(arc_buf_t *from) |
1544 | 1406 |
{ |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1407 |
arc_buf_t *buf; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1408 |
arc_buf_hdr_t *hdr = from->b_hdr; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1409 |
uint64_t size = hdr->b_size; |
1544 | 1410 |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1411 |
ASSERT(hdr->b_state != arc_anon); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1412 |
|
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
1413 |
buf = kmem_cache_alloc(buf_cache, KM_PUSHPAGE); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1414 |
buf->b_hdr = hdr; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1415 |
buf->b_data = NULL; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1416 |
buf->b_efunc = NULL; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1417 |
buf->b_private = NULL; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1418 |
buf->b_next = hdr->b_buf; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1419 |
hdr->b_buf = buf; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1420 |
arc_get_data_buf(buf); |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1421 |
bcopy(from->b_data, buf->b_data, size); |
13840
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1422 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1423 |
/* |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1424 |
* This buffer already exists in the arc so create a duplicate |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1425 |
* copy for the caller. If the buffer is associated with user data |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1426 |
* then track the size and number of duplicates. These stats will be |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1427 |
* updated as duplicate buffers are created and destroyed. |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1428 |
*/ |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1429 |
if (hdr->b_type == ARC_BUFC_DATA) { |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1430 |
ARCSTAT_BUMP(arcstat_duplicate_buffers); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1431 |
ARCSTAT_INCR(arcstat_duplicate_buffers_size, size); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1432 |
} |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1433 |
hdr->b_datacnt += 1; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1434 |
return (buf); |
1544 | 1435 |
} |
1436 |
||
1437 |
void |
|
1438 |
arc_buf_add_ref(arc_buf_t *buf, void* tag) |
|
1439 |
{ |
|
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
1440 |
arc_buf_hdr_t *hdr; |
1544 | 1441 |
kmutex_t *hash_lock; |
1442 |
||
2724
99be9a0b86f6
6469119 race between arc_buf_clone() and arc_buf_add_ref() results in NULL pointer dereference
maybee
parents:
2688
diff
changeset
|
1443 |
/* |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1444 |
* Check to see if this buffer is evicted. Callers |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1445 |
* must verify b_data != NULL to know if the add_ref |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1446 |
* was successful. |
2724
99be9a0b86f6
6469119 race between arc_buf_clone() and arc_buf_add_ref() results in NULL pointer dereference
maybee
parents:
2688
diff
changeset
|
1447 |
*/ |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1448 |
mutex_enter(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1449 |
if (buf->b_data == NULL) { |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1450 |
mutex_exit(&buf->b_evict_lock); |
2724
99be9a0b86f6
6469119 race between arc_buf_clone() and arc_buf_add_ref() results in NULL pointer dereference
maybee
parents:
2688
diff
changeset
|
1451 |
return; |
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
1452 |
} |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1453 |
hash_lock = HDR_LOCK(buf->b_hdr); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1454 |
mutex_enter(hash_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1455 |
hdr = buf->b_hdr; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1456 |
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr)); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1457 |
mutex_exit(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1458 |
|
3403 | 1459 |
ASSERT(hdr->b_state == arc_mru || hdr->b_state == arc_mfu); |
1544 | 1460 |
add_reference(hdr, hash_lock, tag); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1461 |
DTRACE_PROBE1(arc__hit, arc_buf_hdr_t *, hdr); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1462 |
arc_access(hdr, hash_lock); |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1463 |
mutex_exit(hash_lock); |
3403 | 1464 |
ARCSTAT_BUMP(arcstat_hits); |
1465 |
ARCSTAT_CONDSTAT(!(hdr->b_flags & ARC_PREFETCH), |
|
1466 |
demand, prefetch, hdr->b_type != ARC_BUFC_METADATA, |
|
1467 |
data, metadata, hits); |
|
1544 | 1468 |
} |
1469 |
||
5450 | 1470 |
/* |
1471 |
* Free the arc data buffer. If it is an l2arc write in progress, |
|
1472 |
* the buffer is placed on l2arc_free_on_write to be freed later. |
|
1473 |
*/ |
|
1474 |
static void |
|
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1475 |
arc_buf_data_free(arc_buf_t *buf, void (*free_func)(void *, size_t)) |
5450 | 1476 |
{ |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1477 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1478 |
|
5450 | 1479 |
if (HDR_L2_WRITING(hdr)) { |
1480 |
l2arc_data_free_t *df; |
|
1481 |
df = kmem_alloc(sizeof (l2arc_data_free_t), KM_SLEEP); |
|
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1482 |
df->l2df_data = buf->b_data; |
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1483 |
df->l2df_size = hdr->b_size; |
5450 | 1484 |
df->l2df_func = free_func; |
1485 |
mutex_enter(&l2arc_free_on_write_mtx); |
|
1486 |
list_insert_head(l2arc_free_on_write, df); |
|
1487 |
mutex_exit(&l2arc_free_on_write_mtx); |
|
1488 |
ARCSTAT_BUMP(arcstat_l2_free_on_write); |
|
1489 |
} else { |
|
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1490 |
free_func(buf->b_data, hdr->b_size); |
5450 | 1491 |
} |
1492 |
} |
|
1493 |
||
789 | 1494 |
static void |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1495 |
arc_buf_destroy(arc_buf_t *buf, boolean_t recycle, boolean_t all) |
1544 | 1496 |
{ |
1497 |
arc_buf_t **bufp; |
|
1498 |
||
1499 |
/* free up data associated with the buf */ |
|
1500 |
if (buf->b_data) { |
|
1501 |
arc_state_t *state = buf->b_hdr->b_state; |
|
1502 |
uint64_t size = buf->b_hdr->b_size; |
|
3290 | 1503 |
arc_buf_contents_t type = buf->b_hdr->b_type; |
1544 | 1504 |
|
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1505 |
arc_cksum_verify(buf); |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1506 |
arc_buf_unwatch(buf); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1507 |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1508 |
if (!recycle) { |
3290 | 1509 |
if (type == ARC_BUFC_METADATA) { |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1510 |
arc_buf_data_free(buf, zio_buf_free); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1511 |
arc_space_return(size, ARC_SPACE_DATA); |
3290 | 1512 |
} else { |
1513 |
ASSERT(type == ARC_BUFC_DATA); |
|
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
1514 |
arc_buf_data_free(buf, zio_data_buf_free); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
1515 |
ARCSTAT_INCR(arcstat_data_size, -size); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1516 |
atomic_add_64(&arc_size, -size); |
3290 | 1517 |
} |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1518 |
} |
1544 | 1519 |
if (list_link_active(&buf->b_hdr->b_arc_node)) { |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1520 |
uint64_t *cnt = &state->arcs_lsize[type]; |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1521 |
|
1544 | 1522 |
ASSERT(refcount_is_zero(&buf->b_hdr->b_refcnt)); |
3403 | 1523 |
ASSERT(state != arc_anon); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1524 |
|
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1525 |
ASSERT3U(*cnt, >=, size); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1526 |
atomic_add_64(cnt, -size); |
1544 | 1527 |
} |
3403 | 1528 |
ASSERT3U(state->arcs_size, >=, size); |
1529 |
atomic_add_64(&state->arcs_size, -size); |
|
1544 | 1530 |
buf->b_data = NULL; |
13840
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1531 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1532 |
/* |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1533 |
* If we're destroying a duplicate buffer make sure |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1534 |
* that the appropriate statistics are updated. |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1535 |
*/ |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1536 |
if (buf->b_hdr->b_datacnt > 1 && |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1537 |
buf->b_hdr->b_type == ARC_BUFC_DATA) { |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1538 |
ARCSTAT_BUMPDOWN(arcstat_duplicate_buffers); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1539 |
ARCSTAT_INCR(arcstat_duplicate_buffers_size, -size); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1540 |
} |
1544 | 1541 |
ASSERT(buf->b_hdr->b_datacnt > 0); |
1542 |
buf->b_hdr->b_datacnt -= 1; |
|
1543 |
} |
|
1544 |
||
1545 |
/* only remove the buf if requested */ |
|
1546 |
if (!all) |
|
1547 |
return; |
|
1548 |
||
1549 |
/* remove the buf from the hdr list */ |
|
1550 |
for (bufp = &buf->b_hdr->b_buf; *bufp != buf; bufp = &(*bufp)->b_next) |
|
1551 |
continue; |
|
1552 |
*bufp = buf->b_next; |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1553 |
buf->b_next = NULL; |
1544 | 1554 |
|
1555 |
ASSERT(buf->b_efunc == NULL); |
|
1556 |
||
1557 |
/* clean up the buf */ |
|
1558 |
buf->b_hdr = NULL; |
|
1559 |
kmem_cache_free(buf_cache, buf); |
|
1560 |
} |
|
1561 |
||
1562 |
static void |
|
1563 |
arc_hdr_destroy(arc_buf_hdr_t *hdr) |
|
789 | 1564 |
{ |
1565 |
ASSERT(refcount_is_zero(&hdr->b_refcnt)); |
|
3403 | 1566 |
ASSERT3P(hdr->b_state, ==, arc_anon); |
1544 | 1567 |
ASSERT(!HDR_IO_IN_PROGRESS(hdr)); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1568 |
l2arc_buf_hdr_t *l2hdr = hdr->b_l2hdr; |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1569 |
|
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1570 |
if (l2hdr != NULL) { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1571 |
boolean_t buflist_held = MUTEX_HELD(&l2arc_buflist_mtx); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1572 |
/* |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1573 |
* To prevent arc_free() and l2arc_evict() from |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1574 |
* attempting to free the same buffer at the same time, |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1575 |
* a FREE_IN_PROGRESS flag is given to arc_free() to |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1576 |
* give it priority. l2arc_evict() can't destroy this |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1577 |
* header while we are waiting on l2arc_buflist_mtx. |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1578 |
* |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1579 |
* The hdr may be removed from l2ad_buflist before we |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1580 |
* grab l2arc_buflist_mtx, so b_l2hdr is rechecked. |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1581 |
*/ |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1582 |
if (!buflist_held) { |
5450 | 1583 |
mutex_enter(&l2arc_buflist_mtx); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1584 |
l2hdr = hdr->b_l2hdr; |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1585 |
} |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1586 |
|
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1587 |
if (l2hdr != NULL) { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1588 |
list_remove(l2hdr->b_dev->l2ad_buflist, hdr); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1589 |
ARCSTAT_INCR(arcstat_l2_size, -hdr->b_size); |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
1590 |
ARCSTAT_INCR(arcstat_l2_asize, -l2hdr->b_asize); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1591 |
kmem_free(l2hdr, sizeof (l2arc_buf_hdr_t)); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1592 |
if (hdr->b_state == arc_l2c_only) |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1593 |
l2arc_hdr_stat_remove(); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1594 |
hdr->b_l2hdr = NULL; |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1595 |
} |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1596 |
|
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1597 |
if (!buflist_held) |
5450 | 1598 |
mutex_exit(&l2arc_buflist_mtx); |
1599 |
} |
|
1600 |
||
789 | 1601 |
if (!BUF_EMPTY(hdr)) { |
1544 | 1602 |
ASSERT(!HDR_IN_HASH_TABLE(hdr)); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1603 |
buf_discard_identity(hdr); |
789 | 1604 |
} |
1544 | 1605 |
while (hdr->b_buf) { |
789 | 1606 |
arc_buf_t *buf = hdr->b_buf; |
1607 |
||
1544 | 1608 |
if (buf->b_efunc) { |
1609 |
mutex_enter(&arc_eviction_mtx); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1610 |
mutex_enter(&buf->b_evict_lock); |
1544 | 1611 |
ASSERT(buf->b_hdr != NULL); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1612 |
arc_buf_destroy(hdr->b_buf, FALSE, FALSE); |
1544 | 1613 |
hdr->b_buf = buf->b_next; |
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
1614 |
buf->b_hdr = &arc_eviction_hdr; |
1544 | 1615 |
buf->b_next = arc_eviction_list; |
1616 |
arc_eviction_list = buf; |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1617 |
mutex_exit(&buf->b_evict_lock); |
1544 | 1618 |
mutex_exit(&arc_eviction_mtx); |
1619 |
} else { |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1620 |
arc_buf_destroy(hdr->b_buf, FALSE, TRUE); |
1544 | 1621 |
} |
789 | 1622 |
} |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1623 |
if (hdr->b_freeze_cksum != NULL) { |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1624 |
kmem_free(hdr->b_freeze_cksum, sizeof (zio_cksum_t)); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1625 |
hdr->b_freeze_cksum = NULL; |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
1626 |
} |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1627 |
if (hdr->b_thawed) { |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1628 |
kmem_free(hdr->b_thawed, 1); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1629 |
hdr->b_thawed = NULL; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1630 |
} |
1544 | 1631 |
|
789 | 1632 |
ASSERT(!list_link_active(&hdr->b_arc_node)); |
1633 |
ASSERT3P(hdr->b_hash_next, ==, NULL); |
|
1634 |
ASSERT3P(hdr->b_acb, ==, NULL); |
|
1635 |
kmem_cache_free(hdr_cache, hdr); |
|
1636 |
} |
|
1637 |
||
1638 |
void |
|
1639 |
arc_buf_free(arc_buf_t *buf, void *tag) |
|
1640 |
{ |
|
1641 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
|
3403 | 1642 |
int hashed = hdr->b_state != arc_anon; |
1544 | 1643 |
|
1644 |
ASSERT(buf->b_efunc == NULL); |
|
1645 |
ASSERT(buf->b_data != NULL); |
|
1646 |
||
1647 |
if (hashed) { |
|
1648 |
kmutex_t *hash_lock = HDR_LOCK(hdr); |
|
1649 |
||
1650 |
mutex_enter(hash_lock); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1651 |
hdr = buf->b_hdr; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1652 |
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr)); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1653 |
|
1544 | 1654 |
(void) remove_reference(hdr, hash_lock, tag); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1655 |
if (hdr->b_datacnt > 1) { |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1656 |
arc_buf_destroy(buf, FALSE, TRUE); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1657 |
} else { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1658 |
ASSERT(buf == hdr->b_buf); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1659 |
ASSERT(buf->b_efunc == NULL); |
1544 | 1660 |
hdr->b_flags |= ARC_BUF_AVAILABLE; |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1661 |
} |
1544 | 1662 |
mutex_exit(hash_lock); |
1663 |
} else if (HDR_IO_IN_PROGRESS(hdr)) { |
|
1664 |
int destroy_hdr; |
|
1665 |
/* |
|
1666 |
* We are in the middle of an async write. Don't destroy |
|
1667 |
* this buffer unless the write completes before we finish |
|
1668 |
* decrementing the reference count. |
|
1669 |
*/ |
|
1670 |
mutex_enter(&arc_eviction_mtx); |
|
1671 |
(void) remove_reference(hdr, NULL, tag); |
|
1672 |
ASSERT(refcount_is_zero(&hdr->b_refcnt)); |
|
1673 |
destroy_hdr = !HDR_IO_IN_PROGRESS(hdr); |
|
1674 |
mutex_exit(&arc_eviction_mtx); |
|
1675 |
if (destroy_hdr) |
|
1676 |
arc_hdr_destroy(hdr); |
|
1677 |
} else { |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1678 |
if (remove_reference(hdr, NULL, tag) > 0) |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1679 |
arc_buf_destroy(buf, FALSE, TRUE); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1680 |
else |
1544 | 1681 |
arc_hdr_destroy(hdr); |
1682 |
} |
|
1683 |
} |
|
1684 |
||
13973
4972ab336f54
3464 zfs synctask code needs restructuring
Matthew Ahrens <mahrens@delphix.com>
parents:
13958
diff
changeset
|
1685 |
boolean_t |
1544 | 1686 |
arc_buf_remove_ref(arc_buf_t *buf, void* tag) |
1687 |
{ |
|
1688 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
|
789 | 1689 |
kmutex_t *hash_lock = HDR_LOCK(hdr); |
13973
4972ab336f54
3464 zfs synctask code needs restructuring
Matthew Ahrens <mahrens@delphix.com>
parents:
13958
diff
changeset
|
1690 |
boolean_t no_callback = (buf->b_efunc == NULL); |
1544 | 1691 |
|
3403 | 1692 |
if (hdr->b_state == arc_anon) { |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1693 |
ASSERT(hdr->b_datacnt == 1); |
1544 | 1694 |
arc_buf_free(buf, tag); |
1695 |
return (no_callback); |
|
1696 |
} |
|
789 | 1697 |
|
1698 |
mutex_enter(hash_lock); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1699 |
hdr = buf->b_hdr; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1700 |
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr)); |
3403 | 1701 |
ASSERT(hdr->b_state != arc_anon); |
1544 | 1702 |
ASSERT(buf->b_data != NULL); |
789 | 1703 |
|
1544 | 1704 |
(void) remove_reference(hdr, hash_lock, tag); |
1705 |
if (hdr->b_datacnt > 1) { |
|
1706 |
if (no_callback) |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1707 |
arc_buf_destroy(buf, FALSE, TRUE); |
1544 | 1708 |
} else if (no_callback) { |
1709 |
ASSERT(hdr->b_buf == buf && buf->b_next == NULL); |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
1710 |
ASSERT(buf->b_efunc == NULL); |
1544 | 1711 |
hdr->b_flags |= ARC_BUF_AVAILABLE; |
789 | 1712 |
} |
1544 | 1713 |
ASSERT(no_callback || hdr->b_datacnt > 1 || |
1714 |
refcount_is_zero(&hdr->b_refcnt)); |
|
789 | 1715 |
mutex_exit(hash_lock); |
1544 | 1716 |
return (no_callback); |
789 | 1717 |
} |
1718 |
||
1719 |
int |
|
1720 |
arc_buf_size(arc_buf_t *buf) |
|
1721 |
{ |
|
1722 |
return (buf->b_hdr->b_size); |
|
1723 |
} |
|
1724 |
||
1725 |
/* |
|
13840
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1726 |
* Called from the DMU to determine if the current buffer should be |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1727 |
* evicted. In order to ensure proper locking, the eviction must be initiated |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1728 |
* from the DMU. Return true if the buffer is associated with user data and |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1729 |
* duplicate buffers still exist. |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1730 |
*/ |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1731 |
boolean_t |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1732 |
arc_buf_eviction_needed(arc_buf_t *buf) |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1733 |
{ |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1734 |
arc_buf_hdr_t *hdr; |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1735 |
boolean_t evict_needed = B_FALSE; |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1736 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1737 |
if (zfs_disable_dup_eviction) |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1738 |
return (B_FALSE); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1739 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1740 |
mutex_enter(&buf->b_evict_lock); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1741 |
hdr = buf->b_hdr; |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1742 |
if (hdr == NULL) { |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1743 |
/* |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1744 |
* We are in arc_do_user_evicts(); let that function |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1745 |
* perform the eviction. |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1746 |
*/ |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1747 |
ASSERT(buf->b_data == NULL); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1748 |
mutex_exit(&buf->b_evict_lock); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1749 |
return (B_FALSE); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1750 |
} else if (buf->b_data == NULL) { |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1751 |
/* |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1752 |
* We have already been added to the arc eviction list; |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1753 |
* recommend eviction. |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1754 |
*/ |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1755 |
ASSERT3P(hdr, ==, &arc_eviction_hdr); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1756 |
mutex_exit(&buf->b_evict_lock); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1757 |
return (B_TRUE); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1758 |
} |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1759 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1760 |
if (hdr->b_datacnt > 1 && hdr->b_type == ARC_BUFC_DATA) |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1761 |
evict_needed = B_TRUE; |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1762 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1763 |
mutex_exit(&buf->b_evict_lock); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1764 |
return (evict_needed); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1765 |
} |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1766 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
1767 |
/* |
789 | 1768 |
* Evict buffers from list until we've removed the specified number of |
1769 |
* bytes. Move the removed buffers to the appropriate evict state. |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1770 |
* If the recycle flag is set, then attempt to "recycle" a buffer: |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1771 |
* - look for a buffer to evict that is `bytes' long. |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1772 |
* - return the data block from this buffer rather than freeing it. |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1773 |
* This flag is used by callers that are trying to make space for a |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1774 |
* new buffer in a full arc cache. |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
1775 |
* |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
1776 |
* This function makes a "best effort". It skips over any buffers |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
1777 |
* it can't get a hash_lock on, and so may not catch all candidates. |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
1778 |
* It may also return without evicting as much space as requested. |
789 | 1779 |
*/ |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1780 |
static void * |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
1781 |
arc_evict(arc_state_t *state, uint64_t spa, int64_t bytes, boolean_t recycle, |
3290 | 1782 |
arc_buf_contents_t type) |
789 | 1783 |
{ |
1784 |
arc_state_t *evicted_state; |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1785 |
uint64_t bytes_evicted = 0, skipped = 0, missed = 0; |
2918
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1786 |
arc_buf_hdr_t *ab, *ab_prev = NULL; |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1787 |
list_t *list = &state->arcs_list[type]; |
789 | 1788 |
kmutex_t *hash_lock; |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1789 |
boolean_t have_lock; |
2918
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1790 |
void *stolen = NULL; |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1791 |
arc_buf_hdr_t marker = { 0 }; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1792 |
int count = 0; |
789 | 1793 |
|
3403 | 1794 |
ASSERT(state == arc_mru || state == arc_mfu); |
789 | 1795 |
|
3403 | 1796 |
evicted_state = (state == arc_mru) ? arc_mru_ghost : arc_mfu_ghost; |
789 | 1797 |
|
3403 | 1798 |
mutex_enter(&state->arcs_mtx); |
1799 |
mutex_enter(&evicted_state->arcs_mtx); |
|
789 | 1800 |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1801 |
for (ab = list_tail(list); ab; ab = ab_prev) { |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1802 |
ab_prev = list_prev(list, ab); |
2391 | 1803 |
/* prefetch buffers have a minimum lifespan */ |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1804 |
if (HDR_IO_IN_PROGRESS(ab) || |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
1805 |
(spa && ab->b_spa != spa) || |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1806 |
(ab->b_flags & (ARC_PREFETCH|ARC_INDIRECT) && |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
1807 |
ddi_get_lbolt() - ab->b_arc_access < |
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
1808 |
arc_min_prefetch_lifespan)) { |
2391 | 1809 |
skipped++; |
1810 |
continue; |
|
1811 |
} |
|
2918
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1812 |
/* "lookahead" for better eviction candidate */ |
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1813 |
if (recycle && ab->b_size != bytes && |
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1814 |
ab_prev && ab_prev->b_size == bytes) |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1815 |
continue; |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1816 |
|
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1817 |
/* ignore markers */ |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1818 |
if (ab->b_spa == 0) |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1819 |
continue; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1820 |
|
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1821 |
/* |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1822 |
* It may take a long time to evict all the bufs requested. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1823 |
* To avoid blocking all arc activity, periodically drop |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1824 |
* the arcs_mtx and give other threads a chance to run |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1825 |
* before reacquiring the lock. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1826 |
* |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1827 |
* If we are looking for a buffer to recycle, we are in |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1828 |
* the hot code path, so don't sleep. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1829 |
*/ |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1830 |
if (!recycle && count++ > arc_evict_iterations) { |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1831 |
list_insert_after(list, ab, &marker); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1832 |
mutex_exit(&evicted_state->arcs_mtx); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1833 |
mutex_exit(&state->arcs_mtx); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1834 |
kpreempt(KPREEMPT_SYNC); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1835 |
mutex_enter(&state->arcs_mtx); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1836 |
mutex_enter(&evicted_state->arcs_mtx); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1837 |
ab_prev = list_prev(list, &marker); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1838 |
list_remove(list, &marker); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1839 |
count = 0; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1840 |
continue; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1841 |
} |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1842 |
|
789 | 1843 |
hash_lock = HDR_LOCK(ab); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1844 |
have_lock = MUTEX_HELD(hash_lock); |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1845 |
if (have_lock || mutex_tryenter(hash_lock)) { |
13805
e3a9ae14a119
3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
Madhav Suresh <madhav.suresh@delphix.com>
parents:
13790
diff
changeset
|
1846 |
ASSERT0(refcount_count(&ab->b_refcnt)); |
1544 | 1847 |
ASSERT(ab->b_datacnt > 0); |
1848 |
while (ab->b_buf) { |
|
1849 |
arc_buf_t *buf = ab->b_buf; |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1850 |
if (!mutex_tryenter(&buf->b_evict_lock)) { |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1851 |
missed += 1; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1852 |
break; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1853 |
} |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1854 |
if (buf->b_data) { |
1544 | 1855 |
bytes_evicted += ab->b_size; |
3290 | 1856 |
if (recycle && ab->b_type == type && |
5450 | 1857 |
ab->b_size == bytes && |
1858 |
!HDR_L2_WRITING(ab)) { |
|
2918
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1859 |
stolen = buf->b_data; |
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1860 |
recycle = FALSE; |
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1861 |
} |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1862 |
} |
1544 | 1863 |
if (buf->b_efunc) { |
1864 |
mutex_enter(&arc_eviction_mtx); |
|
2918
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1865 |
arc_buf_destroy(buf, |
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1866 |
buf->b_data == stolen, FALSE); |
1544 | 1867 |
ab->b_buf = buf->b_next; |
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
1868 |
buf->b_hdr = &arc_eviction_hdr; |
1544 | 1869 |
buf->b_next = arc_eviction_list; |
1870 |
arc_eviction_list = buf; |
|
1871 |
mutex_exit(&arc_eviction_mtx); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1872 |
mutex_exit(&buf->b_evict_lock); |
1544 | 1873 |
} else { |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
1874 |
mutex_exit(&buf->b_evict_lock); |
2918
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1875 |
arc_buf_destroy(buf, |
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1876 |
buf->b_data == stolen, TRUE); |
1544 | 1877 |
} |
1878 |
} |
|
10357
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1879 |
|
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1880 |
if (ab->b_l2hdr) { |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1881 |
ARCSTAT_INCR(arcstat_evict_l2_cached, |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1882 |
ab->b_size); |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1883 |
} else { |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1884 |
if (l2arc_write_eligible(ab->b_spa, ab)) { |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1885 |
ARCSTAT_INCR(arcstat_evict_l2_eligible, |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1886 |
ab->b_size); |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1887 |
} else { |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1888 |
ARCSTAT_INCR( |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1889 |
arcstat_evict_l2_ineligible, |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1890 |
ab->b_size); |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1891 |
} |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1892 |
} |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
1893 |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1894 |
if (ab->b_datacnt == 0) { |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1895 |
arc_change_state(evicted_state, ab, hash_lock); |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1896 |
ASSERT(HDR_IN_HASH_TABLE(ab)); |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1897 |
ab->b_flags |= ARC_IN_HASH_TABLE; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1898 |
ab->b_flags &= ~ARC_BUF_AVAILABLE; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1899 |
DTRACE_PROBE1(arc__evict, arc_buf_hdr_t *, ab); |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
1900 |
} |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1901 |
if (!have_lock) |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1902 |
mutex_exit(hash_lock); |
1544 | 1903 |
if (bytes >= 0 && bytes_evicted >= bytes) |
789 | 1904 |
break; |
1905 |
} else { |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1906 |
missed += 1; |
789 | 1907 |
} |
1908 |
} |
|
3403 | 1909 |
|
1910 |
mutex_exit(&evicted_state->arcs_mtx); |
|
1911 |
mutex_exit(&state->arcs_mtx); |
|
789 | 1912 |
|
1913 |
if (bytes_evicted < bytes) |
|
1914 |
dprintf("only evicted %lld bytes from %x", |
|
1915 |
(longlong_t)bytes_evicted, state); |
|
1916 |
||
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1917 |
if (skipped) |
3403 | 1918 |
ARCSTAT_INCR(arcstat_evict_skip, skipped); |
1919 |
||
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
1920 |
if (missed) |
3403 | 1921 |
ARCSTAT_INCR(arcstat_mutex_miss, missed); |
1922 |
||
4709
dc10a713d1a0
6453407 rm a file when the root file system is at its quota limit reports ENOSPC
maybee
parents:
4645
diff
changeset
|
1923 |
/* |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1924 |
* Note: we have just evicted some data into the ghost state, |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1925 |
* potentially putting the ghost size over the desired size. Rather |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1926 |
* that evicting from the ghost list in this hot code path, leave |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1927 |
* this chore to the arc_reclaim_thread(). |
4709
dc10a713d1a0
6453407 rm a file when the root file system is at its quota limit reports ENOSPC
maybee
parents:
4645
diff
changeset
|
1928 |
*/ |
dc10a713d1a0
6453407 rm a file when the root file system is at its quota limit reports ENOSPC
maybee
parents:
4645
diff
changeset
|
1929 |
|
2918
5e0808c08daa
6478928 buffer recycling causes long arc mutex spins
maybee
parents:
2887
diff
changeset
|
1930 |
return (stolen); |
789 | 1931 |
} |
1932 |
||
1933 |
/* |
|
1934 |
* Remove buffers from list until we've removed the specified number of |
|
1935 |
* bytes. Destroy the buffers that are removed. |
|
1936 |
*/ |
|
1937 |
static void |
|
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
1938 |
arc_evict_ghost(arc_state_t *state, uint64_t spa, int64_t bytes) |
789 | 1939 |
{ |
1940 |
arc_buf_hdr_t *ab, *ab_prev; |
|
12674
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
1941 |
arc_buf_hdr_t marker = { 0 }; |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1942 |
list_t *list = &state->arcs_list[ARC_BUFC_DATA]; |
789 | 1943 |
kmutex_t *hash_lock; |
1544 | 1944 |
uint64_t bytes_deleted = 0; |
3700
3a7e0afcf1b4
6523936 BAD TRAP: type=8 (#df Double fault) rp=fec266f8 addr=0
ek110237
parents:
3552
diff
changeset
|
1945 |
uint64_t bufs_skipped = 0; |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1946 |
int count = 0; |
789 | 1947 |
|
1544 | 1948 |
ASSERT(GHOST_STATE(state)); |
789 | 1949 |
top: |
3403 | 1950 |
mutex_enter(&state->arcs_mtx); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1951 |
for (ab = list_tail(list); ab; ab = ab_prev) { |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
1952 |
ab_prev = list_prev(list, ab); |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1953 |
if (ab->b_type > ARC_BUFC_NUMTYPES) |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1954 |
panic("invalid ab=%p", (void *)ab); |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
1955 |
if (spa && ab->b_spa != spa) |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
1956 |
continue; |
12674
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
1957 |
|
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
1958 |
/* ignore markers */ |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
1959 |
if (ab->b_spa == 0) |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
1960 |
continue; |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
1961 |
|
789 | 1962 |
hash_lock = HDR_LOCK(ab); |
12033
308d70e4dce8
6935088 elpaso panics: kernel heap corruption detected
William Gorrell <william.gorrell@sun.com>
parents:
11805
diff
changeset
|
1963 |
/* caller may be trying to modify this buffer, skip it */ |
308d70e4dce8
6935088 elpaso panics: kernel heap corruption detected
William Gorrell <william.gorrell@sun.com>
parents:
11805
diff
changeset
|
1964 |
if (MUTEX_HELD(hash_lock)) |
308d70e4dce8
6935088 elpaso panics: kernel heap corruption detected
William Gorrell <william.gorrell@sun.com>
parents:
11805
diff
changeset
|
1965 |
continue; |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1966 |
|
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1967 |
/* |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1968 |
* It may take a long time to evict all the bufs requested. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1969 |
* To avoid blocking all arc activity, periodically drop |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1970 |
* the arcs_mtx and give other threads a chance to run |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1971 |
* before reacquiring the lock. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1972 |
*/ |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1973 |
if (count++ > arc_evict_iterations) { |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1974 |
list_insert_after(list, ab, &marker); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1975 |
mutex_exit(&state->arcs_mtx); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1976 |
kpreempt(KPREEMPT_SYNC); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1977 |
mutex_enter(&state->arcs_mtx); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1978 |
ab_prev = list_prev(list, &marker); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1979 |
list_remove(list, &marker); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1980 |
count = 0; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1981 |
continue; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
1982 |
} |
12033
308d70e4dce8
6935088 elpaso panics: kernel heap corruption detected
William Gorrell <william.gorrell@sun.com>
parents:
11805
diff
changeset
|
1983 |
if (mutex_tryenter(hash_lock)) { |
2391 | 1984 |
ASSERT(!HDR_IO_IN_PROGRESS(ab)); |
1544 | 1985 |
ASSERT(ab->b_buf == NULL); |
3403 | 1986 |
ARCSTAT_BUMP(arcstat_deleted); |
1544 | 1987 |
bytes_deleted += ab->b_size; |
5450 | 1988 |
|
1989 |
if (ab->b_l2hdr != NULL) { |
|
1990 |
/* |
|
1991 |
* This buffer is cached on the 2nd Level ARC; |
|
1992 |
* don't destroy the header. |
|
1993 |
*/ |
|
1994 |
arc_change_state(arc_l2c_only, ab, hash_lock); |
|
12033
308d70e4dce8
6935088 elpaso panics: kernel heap corruption detected
William Gorrell <william.gorrell@sun.com>
parents:
11805
diff
changeset
|
1995 |
mutex_exit(hash_lock); |
5450 | 1996 |
} else { |
1997 |
arc_change_state(arc_anon, ab, hash_lock); |
|
12033
308d70e4dce8
6935088 elpaso panics: kernel heap corruption detected
William Gorrell <william.gorrell@sun.com>
parents:
11805
diff
changeset
|
1998 |
mutex_exit(hash_lock); |
5450 | 1999 |
arc_hdr_destroy(ab); |
2000 |
} |
|
2001 |
||
789 | 2002 |
DTRACE_PROBE1(arc__delete, arc_buf_hdr_t *, ab); |
2003 |
if (bytes >= 0 && bytes_deleted >= bytes) |
|
2004 |
break; |
|
12674
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2005 |
} else if (bytes < 0) { |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2006 |
/* |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2007 |
* Insert a list marker and then wait for the |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2008 |
* hash lock to become available. Once its |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2009 |
* available, restart from where we left off. |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2010 |
*/ |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2011 |
list_insert_after(list, ab, &marker); |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2012 |
mutex_exit(&state->arcs_mtx); |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2013 |
mutex_enter(hash_lock); |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2014 |
mutex_exit(hash_lock); |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2015 |
mutex_enter(&state->arcs_mtx); |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2016 |
ab_prev = list_prev(list, &marker); |
fb4985fff3dd
6954665 system stuck spinning in arc_evict_ghost()
Sanjeev Bagewadi <Sanjeev.Bagewadi@Sun.COM>
parents:
12636
diff
changeset
|
2017 |
list_remove(list, &marker); |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
2018 |
} else { |
789 | 2019 |
bufs_skipped += 1; |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
2020 |
} |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
2021 |
|
789 | 2022 |
} |
3403 | 2023 |
mutex_exit(&state->arcs_mtx); |
789 | 2024 |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2025 |
if (list == &state->arcs_list[ARC_BUFC_DATA] && |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2026 |
(bytes < 0 || bytes_deleted < bytes)) { |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2027 |
list = &state->arcs_list[ARC_BUFC_METADATA]; |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2028 |
goto top; |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2029 |
} |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2030 |
|
789 | 2031 |
if (bufs_skipped) { |
3403 | 2032 |
ARCSTAT_INCR(arcstat_mutex_miss, bufs_skipped); |
789 | 2033 |
ASSERT(bytes >= 0); |
2034 |
} |
|
2035 |
||
2036 |
if (bytes_deleted < bytes) |
|
2037 |
dprintf("only deleted %lld bytes from %p", |
|
2038 |
(longlong_t)bytes_deleted, state); |
|
2039 |
} |
|
2040 |
||
2041 |
static void |
|
2042 |
arc_adjust(void) |
|
2043 |
{ |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2044 |
int64_t adjustment, delta; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2045 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2046 |
/* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2047 |
* Adjust MRU size |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2048 |
*/ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2049 |
|
12636
13b5d698941e
6950219 large ghost eviction causes high write latency
Tom Erickson <Tom.Erickson@Sun.COM>
parents:
12515
diff
changeset
|
2050 |
adjustment = MIN((int64_t)(arc_size - arc_c), |
13b5d698941e
6950219 large ghost eviction causes high write latency
Tom Erickson <Tom.Erickson@Sun.COM>
parents:
12515
diff
changeset
|
2051 |
(int64_t)(arc_anon->arcs_size + arc_mru->arcs_size + arc_meta_used - |
13b5d698941e
6950219 large ghost eviction causes high write latency
Tom Erickson <Tom.Erickson@Sun.COM>
parents:
12515
diff
changeset
|
2052 |
arc_p)); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2053 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2054 |
if (adjustment > 0 && arc_mru->arcs_lsize[ARC_BUFC_DATA] > 0) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2055 |
delta = MIN(arc_mru->arcs_lsize[ARC_BUFC_DATA], adjustment); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2056 |
(void) arc_evict(arc_mru, NULL, delta, FALSE, ARC_BUFC_DATA); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2057 |
adjustment -= delta; |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2058 |
} |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2059 |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2060 |
if (adjustment > 0 && arc_mru->arcs_lsize[ARC_BUFC_METADATA] > 0) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2061 |
delta = MIN(arc_mru->arcs_lsize[ARC_BUFC_METADATA], adjustment); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2062 |
(void) arc_evict(arc_mru, NULL, delta, FALSE, |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2063 |
ARC_BUFC_METADATA); |
789 | 2064 |
} |
2065 |
||
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2066 |
/* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2067 |
* Adjust MFU size |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2068 |
*/ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2069 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2070 |
adjustment = arc_size - arc_c; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2071 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2072 |
if (adjustment > 0 && arc_mfu->arcs_lsize[ARC_BUFC_DATA] > 0) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2073 |
delta = MIN(adjustment, arc_mfu->arcs_lsize[ARC_BUFC_DATA]); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2074 |
(void) arc_evict(arc_mfu, NULL, delta, FALSE, ARC_BUFC_DATA); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2075 |
adjustment -= delta; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2076 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2077 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2078 |
if (adjustment > 0 && arc_mfu->arcs_lsize[ARC_BUFC_METADATA] > 0) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2079 |
int64_t delta = MIN(adjustment, |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2080 |
arc_mfu->arcs_lsize[ARC_BUFC_METADATA]); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2081 |
(void) arc_evict(arc_mfu, NULL, delta, FALSE, |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2082 |
ARC_BUFC_METADATA); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2083 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2084 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2085 |
/* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2086 |
* Adjust ghost lists |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2087 |
*/ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2088 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2089 |
adjustment = arc_mru->arcs_size + arc_mru_ghost->arcs_size - arc_c; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2090 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2091 |
if (adjustment > 0 && arc_mru_ghost->arcs_size > 0) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2092 |
delta = MIN(arc_mru_ghost->arcs_size, adjustment); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2093 |
arc_evict_ghost(arc_mru_ghost, NULL, delta); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2094 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2095 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2096 |
adjustment = |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2097 |
arc_mru_ghost->arcs_size + arc_mfu_ghost->arcs_size - arc_c; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2098 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2099 |
if (adjustment > 0 && arc_mfu_ghost->arcs_size > 0) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2100 |
delta = MIN(arc_mfu_ghost->arcs_size, adjustment); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2101 |
arc_evict_ghost(arc_mfu_ghost, NULL, delta); |
789 | 2102 |
} |
2103 |
} |
|
2104 |
||
1544 | 2105 |
static void |
2106 |
arc_do_user_evicts(void) |
|
2107 |
{ |
|
2108 |
mutex_enter(&arc_eviction_mtx); |
|
2109 |
while (arc_eviction_list != NULL) { |
|
2110 |
arc_buf_t *buf = arc_eviction_list; |
|
2111 |
arc_eviction_list = buf->b_next; |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
2112 |
mutex_enter(&buf->b_evict_lock); |
1544 | 2113 |
buf->b_hdr = NULL; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
2114 |
mutex_exit(&buf->b_evict_lock); |
1544 | 2115 |
mutex_exit(&arc_eviction_mtx); |
2116 |
||
1819 | 2117 |
if (buf->b_efunc != NULL) |
2118 |
VERIFY(buf->b_efunc(buf) == 0); |
|
1544 | 2119 |
|
2120 |
buf->b_efunc = NULL; |
|
2121 |
buf->b_private = NULL; |
|
2122 |
kmem_cache_free(buf_cache, buf); |
|
2123 |
mutex_enter(&arc_eviction_mtx); |
|
2124 |
} |
|
2125 |
mutex_exit(&arc_eviction_mtx); |
|
2126 |
} |
|
2127 |
||
789 | 2128 |
/* |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2129 |
* Flush all *evictable* data from the cache for the given spa. |
789 | 2130 |
* NOTE: this will not touch "active" (i.e. referenced) data. |
2131 |
*/ |
|
2132 |
void |
|
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2133 |
arc_flush(spa_t *spa) |
789 | 2134 |
{ |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2135 |
uint64_t guid = 0; |
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2136 |
|
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2137 |
if (spa) |
13514
417c34452f03
1748 desire support for reguid in zfs
Garrett D'Amore <garrett@nexenta.com>
parents:
13061
diff
changeset
|
2138 |
guid = spa_load_guid(spa); |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2139 |
|
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2140 |
while (list_head(&arc_mru->arcs_list[ARC_BUFC_DATA])) { |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2141 |
(void) arc_evict(arc_mru, guid, -1, FALSE, ARC_BUFC_DATA); |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2142 |
if (spa) |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2143 |
break; |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2144 |
} |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2145 |
while (list_head(&arc_mru->arcs_list[ARC_BUFC_METADATA])) { |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2146 |
(void) arc_evict(arc_mru, guid, -1, FALSE, ARC_BUFC_METADATA); |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2147 |
if (spa) |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2148 |
break; |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2149 |
} |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2150 |
while (list_head(&arc_mfu->arcs_list[ARC_BUFC_DATA])) { |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2151 |
(void) arc_evict(arc_mfu, guid, -1, FALSE, ARC_BUFC_DATA); |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2152 |
if (spa) |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2153 |
break; |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2154 |
} |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2155 |
while (list_head(&arc_mfu->arcs_list[ARC_BUFC_METADATA])) { |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2156 |
(void) arc_evict(arc_mfu, guid, -1, FALSE, ARC_BUFC_METADATA); |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2157 |
if (spa) |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2158 |
break; |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2159 |
} |
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2160 |
|
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2161 |
arc_evict_ghost(arc_mru_ghost, guid, -1); |
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2162 |
arc_evict_ghost(arc_mfu_ghost, guid, -1); |
1544 | 2163 |
|
2164 |
mutex_enter(&arc_reclaim_thr_lock); |
|
2165 |
arc_do_user_evicts(); |
|
2166 |
mutex_exit(&arc_reclaim_thr_lock); |
|
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2167 |
ASSERT(spa || arc_eviction_list == NULL); |
789 | 2168 |
} |
2169 |
||
2170 |
void |
|
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
2171 |
arc_shrink(void) |
789 | 2172 |
{ |
3403 | 2173 |
if (arc_c > arc_c_min) { |
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
2174 |
uint64_t to_free; |
789 | 2175 |
|
2048
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2176 |
#ifdef _KERNEL |
3403 | 2177 |
to_free = MAX(arc_c >> arc_shrink_shift, ptob(needfree)); |
2048
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2178 |
#else |
3403 | 2179 |
to_free = arc_c >> arc_shrink_shift; |
2048
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2180 |
#endif |
3403 | 2181 |
if (arc_c > arc_c_min + to_free) |
2182 |
atomic_add_64(&arc_c, -to_free); |
|
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
2183 |
else |
3403 | 2184 |
arc_c = arc_c_min; |
2048
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2185 |
|
3403 | 2186 |
atomic_add_64(&arc_p, -(arc_p >> arc_shrink_shift)); |
2187 |
if (arc_c > arc_size) |
|
2188 |
arc_c = MAX(arc_size, arc_c_min); |
|
2189 |
if (arc_p > arc_c) |
|
2190 |
arc_p = (arc_c >> 1); |
|
2191 |
ASSERT(arc_c >= arc_c_min); |
|
2192 |
ASSERT((int64_t)arc_p >= 0); |
|
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
2193 |
} |
789 | 2194 |
|
3403 | 2195 |
if (arc_size > arc_c) |
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
2196 |
arc_adjust(); |
789 | 2197 |
} |
2198 |
||
13682
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2199 |
/* |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2200 |
* Determine if the system is under memory pressure and is asking |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2201 |
* to reclaim memory. A return value of 1 indicates that the system |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2202 |
* is under memory pressure and that the arc should adjust accordingly. |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2203 |
*/ |
789 | 2204 |
static int |
2205 |
arc_reclaim_needed(void) |
|
2206 |
{ |
|
2207 |
uint64_t extra; |
|
2208 |
||
2209 |
#ifdef _KERNEL |
|
2048
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2210 |
|
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2211 |
if (needfree) |
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2212 |
return (1); |
8ceabdf91507
4034947 anon_swap_adjust() should call kmem_reap() if availrmem is low.
stans
parents:
1990
diff
changeset
|
2213 |
|
789 | 2214 |
/* |
2215 |
* take 'desfree' extra pages, so we reclaim sooner, rather than later |
|
2216 |
*/ |
|
2217 |
extra = desfree; |
|
2218 |
||
2219 |
/* |
|
2220 |
* check that we're out of range of the pageout scanner. It starts to |
|
2221 |
* schedule paging if freemem is less than lotsfree and needfree. |
|
2222 |
* lotsfree is the high-water mark for pageout, and needfree is the |
|
2223 |
* number of needed free pages. We add extra pages here to make sure |
|
2224 |
* the scanner doesn't start up while we're freeing memory. |
|
2225 |
*/ |
|
2226 |
if (freemem < lotsfree + needfree + extra) |
|
2227 |
return (1); |
|
2228 |
||
2229 |
/* |
|
2230 |
* check to make sure that swapfs has enough space so that anon |
|
5450 | 2231 |
* reservations can still succeed. anon_resvmem() checks that the |
789 | 2232 |
* availrmem is greater than swapfs_minfree, and the number of reserved |
2233 |
* swap pages. We also add a bit of extra here just to prevent |
|
2234 |
* circumstances from getting really dire. |
|
2235 |
*/ |
|
2236 |
if (availrmem < swapfs_minfree + swapfs_reserve + extra) |
|
2237 |
return (1); |
|
2238 |
||
14179
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2239 |
/* |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2240 |
* Check that we have enough availrmem that memory locking (e.g., via |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2241 |
* mlock(3C) or memcntl(2)) can still succeed. (pages_pp_maximum |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2242 |
* stores the number of pages that cannot be locked; when availrmem |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2243 |
* drops below pages_pp_maximum, page locking mechanisms such as |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2244 |
* page_pp_lock() will fail.) |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2245 |
*/ |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2246 |
if (availrmem <= pages_pp_maximum) |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2247 |
return (1); |
15e9457c12ec
1974 pages_pp_maximum/lotsfree discrepancy leads to mlock() failure
Bryan Cantrill <bryan@joyent.com>
parents:
14167
diff
changeset
|
2248 |
|
1936
b6ded90e4d4b
6398177 zfs: poor nightly build performance in 32-bit mode (high disk activity)
maybee
parents:
1819
diff
changeset
|
2249 |
#if defined(__i386) |
789 | 2250 |
/* |
2251 |
* If we're on an i386 platform, it's possible that we'll exhaust the |
|
2252 |
* kernel heap space before we ever run out of available physical |
|
2253 |
* memory. Most checks of the size of the heap_area compare against |
|
2254 |
* tune.t_minarmem, which is the minimum available real memory that we |
|
2255 |
* can have in the system. However, this is generally fixed at 25 pages |
|
2256 |
* which is so low that it's useless. In this comparison, we seek to |
|
2257 |
* calculate the total heap-size, and reclaim if more than 3/4ths of the |
|
5450 | 2258 |
* heap is allocated. (Or, in the calculation, if less than 1/4th is |
789 | 2259 |
* free) |
2260 |
*/ |
|
13682
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2261 |
if (vmem_size(heap_arena, VMEM_FREE) < |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2262 |
(vmem_size(heap_arena, VMEM_FREE | VMEM_ALLOC) >> 2)) |
789 | 2263 |
return (1); |
2264 |
#endif |
|
2265 |
||
13682
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2266 |
/* |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2267 |
* If zio data pages are being allocated out of a separate heap segment, |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2268 |
* then enforce that the size of available vmem for this arena remains |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2269 |
* above about 1/16th free. |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2270 |
* |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2271 |
* Note: The 1/16th arena free requirement was put in place |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2272 |
* to aggressively evict memory from the arc in order to avoid |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2273 |
* memory fragmentation issues. |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2274 |
*/ |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2275 |
if (zio_arena != NULL && |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2276 |
vmem_size(zio_arena, VMEM_FREE) < |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2277 |
(vmem_size(zio_arena, VMEM_ALLOC) >> 4)) |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2278 |
return (1); |
789 | 2279 |
#else |
2280 |
if (spa_get_random(100) == 0) |
|
2281 |
return (1); |
|
2282 |
#endif |
|
2283 |
return (0); |
|
2284 |
} |
|
2285 |
||
2286 |
static void |
|
2287 |
arc_kmem_reap_now(arc_reclaim_strategy_t strat) |
|
2288 |
{ |
|
2289 |
size_t i; |
|
2290 |
kmem_cache_t *prev_cache = NULL; |
|
3290 | 2291 |
kmem_cache_t *prev_data_cache = NULL; |
789 | 2292 |
extern kmem_cache_t *zio_buf_cache[]; |
3290 | 2293 |
extern kmem_cache_t *zio_data_buf_cache[]; |
789 | 2294 |
|
1484
d330e98f8ed7
6350001 ZFS lookup performance still much slower than UFS : help tar : help spec SFS
ek110237
parents:
982
diff
changeset
|
2295 |
#ifdef _KERNEL |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2296 |
if (arc_meta_used >= arc_meta_limit) { |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2297 |
/* |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2298 |
* We are exceeding our meta-data cache limit. |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2299 |
* Purge some DNLC entries to release holds on meta-data. |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2300 |
*/ |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2301 |
dnlc_reduce_cache((void *)(uintptr_t)arc_reduce_dnlc_percent); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2302 |
} |
1936
b6ded90e4d4b
6398177 zfs: poor nightly build performance in 32-bit mode (high disk activity)
maybee
parents:
1819
diff
changeset
|
2303 |
#if defined(__i386) |
b6ded90e4d4b
6398177 zfs: poor nightly build performance in 32-bit mode (high disk activity)
maybee
parents:
1819
diff
changeset
|
2304 |
/* |
b6ded90e4d4b
6398177 zfs: poor nightly build performance in 32-bit mode (high disk activity)
maybee
parents:
1819
diff
changeset
|
2305 |
* Reclaim unused memory from all kmem caches. |
b6ded90e4d4b
6398177 zfs: poor nightly build performance in 32-bit mode (high disk activity)
maybee
parents:
1819
diff
changeset
|
2306 |
*/ |
b6ded90e4d4b
6398177 zfs: poor nightly build performance in 32-bit mode (high disk activity)
maybee
parents:
1819
diff
changeset
|
2307 |
kmem_reap(); |
b6ded90e4d4b
6398177 zfs: poor nightly build performance in 32-bit mode (high disk activity)
maybee
parents:
1819
diff
changeset
|
2308 |
#endif |
1484
d330e98f8ed7
6350001 ZFS lookup performance still much slower than UFS : help tar : help spec SFS
ek110237
parents:
982
diff
changeset
|
2309 |
#endif |
d330e98f8ed7
6350001 ZFS lookup performance still much slower than UFS : help tar : help spec SFS
ek110237
parents:
982
diff
changeset
|
2310 |
|
789 | 2311 |
/* |
5450 | 2312 |
* An aggressive reclamation will shrink the cache size as well as |
1544 | 2313 |
* reap free buffers from the arc kmem caches. |
789 | 2314 |
*/ |
2315 |
if (strat == ARC_RECLAIM_AGGR) |
|
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
2316 |
arc_shrink(); |
789 | 2317 |
|
2318 |
for (i = 0; i < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; i++) { |
|
2319 |
if (zio_buf_cache[i] != prev_cache) { |
|
2320 |
prev_cache = zio_buf_cache[i]; |
|
2321 |
kmem_cache_reap_now(zio_buf_cache[i]); |
|
2322 |
} |
|
3290 | 2323 |
if (zio_data_buf_cache[i] != prev_data_cache) { |
2324 |
prev_data_cache = zio_data_buf_cache[i]; |
|
2325 |
kmem_cache_reap_now(zio_data_buf_cache[i]); |
|
2326 |
} |
|
789 | 2327 |
} |
1544 | 2328 |
kmem_cache_reap_now(buf_cache); |
2329 |
kmem_cache_reap_now(hdr_cache); |
|
13682
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2330 |
|
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2331 |
/* |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2332 |
* Ask the vmem areana to reclaim unused memory from its |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2333 |
* quantum caches. |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2334 |
*/ |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2335 |
if (zio_arena != NULL && strat == ARC_RECLAIM_AGGR) |
e7836650181b
1618 zfs causing system to hang in vmem_xalloc()
George Wilson <gwilson@delphix.com>
parents:
13514
diff
changeset
|
2336 |
vmem_qcache_reap(zio_arena); |
789 | 2337 |
} |
2338 |
||
2339 |
static void |
|
2340 |
arc_reclaim_thread(void) |
|
2341 |
{ |
|
2342 |
clock_t growtime = 0; |
|
2343 |
arc_reclaim_strategy_t last_reclaim = ARC_RECLAIM_CONS; |
|
2344 |
callb_cpr_t cpr; |
|
2345 |
||
2346 |
CALLB_CPR_INIT(&cpr, &arc_reclaim_thr_lock, callb_generic_cpr, FTAG); |
|
2347 |
||
2348 |
mutex_enter(&arc_reclaim_thr_lock); |
|
2349 |
while (arc_thread_exit == 0) { |
|
2350 |
if (arc_reclaim_needed()) { |
|
2351 |
||
3403 | 2352 |
if (arc_no_grow) { |
789 | 2353 |
if (last_reclaim == ARC_RECLAIM_CONS) { |
2354 |
last_reclaim = ARC_RECLAIM_AGGR; |
|
2355 |
} else { |
|
2356 |
last_reclaim = ARC_RECLAIM_CONS; |
|
2357 |
} |
|
2358 |
} else { |
|
3403 | 2359 |
arc_no_grow = TRUE; |
789 | 2360 |
last_reclaim = ARC_RECLAIM_AGGR; |
2361 |
membar_producer(); |
|
2362 |
} |
|
2363 |
||
2364 |
/* reset the growth delay for every reclaim */ |
|
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2365 |
growtime = ddi_get_lbolt() + (arc_grow_retry * hz); |
789 | 2366 |
|
2367 |
arc_kmem_reap_now(last_reclaim); |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
2368 |
arc_warm = B_TRUE; |
789 | 2369 |
|
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2370 |
} else if (arc_no_grow && ddi_get_lbolt() >= growtime) { |
3403 | 2371 |
arc_no_grow = FALSE; |
789 | 2372 |
} |
2373 |
||
12636
13b5d698941e
6950219 large ghost eviction causes high write latency
Tom Erickson <Tom.Erickson@Sun.COM>
parents:
12515
diff
changeset
|
2374 |
arc_adjust(); |
3298
1fb2668efa39
6505658 target MRU size (arc.p) needs to be adjusted more aggressively
maybee
parents:
3290
diff
changeset
|
2375 |
|
1544 | 2376 |
if (arc_eviction_list != NULL) |
2377 |
arc_do_user_evicts(); |
|
2378 |
||
789 | 2379 |
/* block until needed, or one second, whichever is shorter */ |
2380 |
CALLB_CPR_SAFE_BEGIN(&cpr); |
|
2381 |
(void) cv_timedwait(&arc_reclaim_thr_cv, |
|
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2382 |
&arc_reclaim_thr_lock, (ddi_get_lbolt() + hz)); |
789 | 2383 |
CALLB_CPR_SAFE_END(&cpr, &arc_reclaim_thr_lock); |
2384 |
} |
|
2385 |
||
2386 |
arc_thread_exit = 0; |
|
2387 |
cv_broadcast(&arc_reclaim_thr_cv); |
|
2388 |
CALLB_CPR_EXIT(&cpr); /* drops arc_reclaim_thr_lock */ |
|
2389 |
thread_exit(); |
|
2390 |
} |
|
2391 |
||
1544 | 2392 |
/* |
2393 |
* Adapt arc info given the number of bytes we are trying to add and |
|
2394 |
* the state that we are comming from. This function is only called |
|
2395 |
* when we are adding new content to the cache. |
|
2396 |
*/ |
|
789 | 2397 |
static void |
1544 | 2398 |
arc_adapt(int bytes, arc_state_t *state) |
789 | 2399 |
{ |
1544 | 2400 |
int mult; |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2401 |
uint64_t arc_p_min = (arc_c >> arc_p_min_shift); |
1544 | 2402 |
|
5450 | 2403 |
if (state == arc_l2c_only) |
2404 |
return; |
|
2405 |
||
1544 | 2406 |
ASSERT(bytes > 0); |
789 | 2407 |
/* |
1544 | 2408 |
* Adapt the target size of the MRU list: |
2409 |
* - if we just hit in the MRU ghost list, then increase |
|
2410 |
* the target size of the MRU list. |
|
2411 |
* - if we just hit in the MFU ghost list, then increase |
|
2412 |
* the target size of the MFU list by decreasing the |
|
2413 |
* target size of the MRU list. |
|
789 | 2414 |
*/ |
3403 | 2415 |
if (state == arc_mru_ghost) { |
2416 |
mult = ((arc_mru_ghost->arcs_size >= arc_mfu_ghost->arcs_size) ? |
|
2417 |
1 : (arc_mfu_ghost->arcs_size/arc_mru_ghost->arcs_size)); |
|
12636
13b5d698941e
6950219 large ghost eviction causes high write latency
Tom Erickson <Tom.Erickson@Sun.COM>
parents:
12515
diff
changeset
|
2418 |
mult = MIN(mult, 10); /* avoid wild arc_p adjustment */ |
1544 | 2419 |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2420 |
arc_p = MIN(arc_c - arc_p_min, arc_p + bytes * mult); |
3403 | 2421 |
} else if (state == arc_mfu_ghost) { |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2422 |
uint64_t delta; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2423 |
|
3403 | 2424 |
mult = ((arc_mfu_ghost->arcs_size >= arc_mru_ghost->arcs_size) ? |
2425 |
1 : (arc_mru_ghost->arcs_size/arc_mfu_ghost->arcs_size)); |
|
12636
13b5d698941e
6950219 large ghost eviction causes high write latency
Tom Erickson <Tom.Erickson@Sun.COM>
parents:
12515
diff
changeset
|
2426 |
mult = MIN(mult, 10); |
1544 | 2427 |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2428 |
delta = MIN(bytes * mult, arc_p); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2429 |
arc_p = MAX(arc_p_min, arc_p - delta); |
1544 | 2430 |
} |
3403 | 2431 |
ASSERT((int64_t)arc_p >= 0); |
789 | 2432 |
|
2433 |
if (arc_reclaim_needed()) { |
|
2434 |
cv_signal(&arc_reclaim_thr_cv); |
|
2435 |
return; |
|
2436 |
} |
|
2437 |
||
3403 | 2438 |
if (arc_no_grow) |
789 | 2439 |
return; |
2440 |
||
3403 | 2441 |
if (arc_c >= arc_c_max) |
1544 | 2442 |
return; |
2443 |
||
789 | 2444 |
/* |
1544 | 2445 |
* If we're within (2 * maxblocksize) bytes of the target |
2446 |
* cache size, increment the target cache size |
|
789 | 2447 |
*/ |
3403 | 2448 |
if (arc_size > arc_c - (2ULL << SPA_MAXBLOCKSHIFT)) { |
2449 |
atomic_add_64(&arc_c, (int64_t)bytes); |
|
2450 |
if (arc_c > arc_c_max) |
|
2451 |
arc_c = arc_c_max; |
|
2452 |
else if (state == arc_anon) |
|
2453 |
atomic_add_64(&arc_p, (int64_t)bytes); |
|
2454 |
if (arc_p > arc_c) |
|
2455 |
arc_p = arc_c; |
|
789 | 2456 |
} |
3403 | 2457 |
ASSERT((int64_t)arc_p >= 0); |
789 | 2458 |
} |
2459 |
||
2460 |
/* |
|
1544 | 2461 |
* Check if the cache has reached its limits and eviction is required |
2462 |
* prior to insert. |
|
789 | 2463 |
*/ |
2464 |
static int |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2465 |
arc_evict_needed(arc_buf_contents_t type) |
789 | 2466 |
{ |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2467 |
if (type == ARC_BUFC_METADATA && arc_meta_used >= arc_meta_limit) |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2468 |
return (1); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2469 |
|
789 | 2470 |
if (arc_reclaim_needed()) |
2471 |
return (1); |
|
2472 |
||
3403 | 2473 |
return (arc_size > arc_c); |
789 | 2474 |
} |
2475 |
||
2476 |
/* |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2477 |
* The buffer, supplied as the first argument, needs a data block. |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2478 |
* So, if we are at cache max, determine which cache should be victimized. |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2479 |
* We have the following cases: |
789 | 2480 |
* |
3403 | 2481 |
* 1. Insert for MRU, p > sizeof(arc_anon + arc_mru) -> |
789 | 2482 |
* In this situation if we're out of space, but the resident size of the MFU is |
2483 |
* under the limit, victimize the MFU cache to satisfy this insertion request. |
|
2484 |
* |
|
3403 | 2485 |
* 2. Insert for MRU, p <= sizeof(arc_anon + arc_mru) -> |
789 | 2486 |
* Here, we've used up all of the available space for the MRU, so we need to |
2487 |
* evict from our own cache instead. Evict from the set of resident MRU |
|
2488 |
* entries. |
|
2489 |
* |
|
3403 | 2490 |
* 3. Insert for MFU (c - p) > sizeof(arc_mfu) -> |
789 | 2491 |
* c minus p represents the MFU space in the cache, since p is the size of the |
2492 |
* cache that is dedicated to the MRU. In this situation there's still space on |
|
2493 |
* the MFU side, so the MRU side needs to be victimized. |
|
2494 |
* |
|
3403 | 2495 |
* 4. Insert for MFU (c - p) < sizeof(arc_mfu) -> |
789 | 2496 |
* MFU's resident set is consuming more space than it has been allotted. In |
2497 |
* this situation, we must victimize our own cache, the MFU, for this insertion. |
|
2498 |
*/ |
|
2499 |
static void |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2500 |
arc_get_data_buf(arc_buf_t *buf) |
789 | 2501 |
{ |
3290 | 2502 |
arc_state_t *state = buf->b_hdr->b_state; |
2503 |
uint64_t size = buf->b_hdr->b_size; |
|
2504 |
arc_buf_contents_t type = buf->b_hdr->b_type; |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2505 |
|
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2506 |
arc_adapt(size, state); |
789 | 2507 |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2508 |
/* |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2509 |
* We have not yet reached cache maximum size, |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2510 |
* just allocate a new buffer. |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2511 |
*/ |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2512 |
if (!arc_evict_needed(type)) { |
3290 | 2513 |
if (type == ARC_BUFC_METADATA) { |
2514 |
buf->b_data = zio_buf_alloc(size); |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2515 |
arc_space_consume(size, ARC_SPACE_DATA); |
3290 | 2516 |
} else { |
2517 |
ASSERT(type == ARC_BUFC_DATA); |
|
2518 |
buf->b_data = zio_data_buf_alloc(size); |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2519 |
ARCSTAT_INCR(arcstat_data_size, size); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2520 |
atomic_add_64(&arc_size, size); |
3290 | 2521 |
} |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2522 |
goto out; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2523 |
} |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2524 |
|
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2525 |
/* |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2526 |
* If we are prefetching from the mfu ghost list, this buffer |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2527 |
* will end up on the mru list; so steal space from there. |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2528 |
*/ |
3403 | 2529 |
if (state == arc_mfu_ghost) |
2530 |
state = buf->b_hdr->b_flags & ARC_PREFETCH ? arc_mru : arc_mfu; |
|
2531 |
else if (state == arc_mru_ghost) |
|
2532 |
state = arc_mru; |
|
789 | 2533 |
|
3403 | 2534 |
if (state == arc_mru || state == arc_anon) { |
2535 |
uint64_t mru_used = arc_anon->arcs_size + arc_mru->arcs_size; |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2536 |
state = (arc_mfu->arcs_lsize[type] >= size && |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2537 |
arc_p > mru_used) ? arc_mfu : arc_mru; |
789 | 2538 |
} else { |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2539 |
/* MFU cases */ |
3403 | 2540 |
uint64_t mfu_space = arc_c - arc_p; |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2541 |
state = (arc_mru->arcs_lsize[type] >= size && |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2542 |
mfu_space > arc_mfu->arcs_size) ? arc_mru : arc_mfu; |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2543 |
} |
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
2544 |
if ((buf->b_data = arc_evict(state, NULL, size, TRUE, type)) == NULL) { |
3290 | 2545 |
if (type == ARC_BUFC_METADATA) { |
2546 |
buf->b_data = zio_buf_alloc(size); |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2547 |
arc_space_consume(size, ARC_SPACE_DATA); |
3290 | 2548 |
} else { |
2549 |
ASSERT(type == ARC_BUFC_DATA); |
|
2550 |
buf->b_data = zio_data_buf_alloc(size); |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2551 |
ARCSTAT_INCR(arcstat_data_size, size); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2552 |
atomic_add_64(&arc_size, size); |
3290 | 2553 |
} |
3403 | 2554 |
ARCSTAT_BUMP(arcstat_recycle_miss); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2555 |
} |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2556 |
ASSERT(buf->b_data != NULL); |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2557 |
out: |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2558 |
/* |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2559 |
* Update the state size. Note that ghost states have a |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2560 |
* "ghost size" and so don't need to be updated. |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2561 |
*/ |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2562 |
if (!GHOST_STATE(buf->b_hdr->b_state)) { |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2563 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2564 |
|
3403 | 2565 |
atomic_add_64(&hdr->b_state->arcs_size, size); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2566 |
if (list_link_active(&hdr->b_arc_node)) { |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2567 |
ASSERT(refcount_is_zero(&hdr->b_refcnt)); |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2568 |
atomic_add_64(&hdr->b_state->arcs_lsize[type], size); |
789 | 2569 |
} |
3298
1fb2668efa39
6505658 target MRU size (arc.p) needs to be adjusted more aggressively
maybee
parents:
3290
diff
changeset
|
2570 |
/* |
1fb2668efa39
6505658 target MRU size (arc.p) needs to be adjusted more aggressively
maybee
parents:
3290
diff
changeset
|
2571 |
* If we are growing the cache, and we are adding anonymous |
3403 | 2572 |
* data, and we have outgrown arc_p, update arc_p |
3298
1fb2668efa39
6505658 target MRU size (arc.p) needs to be adjusted more aggressively
maybee
parents:
3290
diff
changeset
|
2573 |
*/ |
3403 | 2574 |
if (arc_size < arc_c && hdr->b_state == arc_anon && |
2575 |
arc_anon->arcs_size + arc_mru->arcs_size > arc_p) |
|
2576 |
arc_p = MIN(arc_c, arc_p + size); |
|
789 | 2577 |
} |
2578 |
} |
|
2579 |
||
2580 |
/* |
|
2581 |
* This routine is called whenever a buffer is accessed. |
|
1544 | 2582 |
* NOTE: the hash lock is dropped in this function. |
789 | 2583 |
*/ |
2584 |
static void |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2585 |
arc_access(arc_buf_hdr_t *buf, kmutex_t *hash_lock) |
789 | 2586 |
{ |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2587 |
clock_t now; |
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2588 |
|
789 | 2589 |
ASSERT(MUTEX_HELD(hash_lock)); |
2590 |
||
3403 | 2591 |
if (buf->b_state == arc_anon) { |
789 | 2592 |
/* |
2593 |
* This buffer is not in the cache, and does not |
|
2594 |
* appear in our "ghost" list. Add the new buffer |
|
2595 |
* to the MRU state. |
|
2596 |
*/ |
|
2597 |
||
2598 |
ASSERT(buf->b_arc_access == 0); |
|
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2599 |
buf->b_arc_access = ddi_get_lbolt(); |
1544 | 2600 |
DTRACE_PROBE1(new_state__mru, arc_buf_hdr_t *, buf); |
3403 | 2601 |
arc_change_state(arc_mru, buf, hash_lock); |
789 | 2602 |
|
3403 | 2603 |
} else if (buf->b_state == arc_mru) { |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2604 |
now = ddi_get_lbolt(); |
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2605 |
|
789 | 2606 |
/* |
2391 | 2607 |
* If this buffer is here because of a prefetch, then either: |
2608 |
* - clear the flag if this is a "referencing" read |
|
2609 |
* (any subsequent access will bump this into the MFU state). |
|
2610 |
* or |
|
2611 |
* - move the buffer to the head of the list if this is |
|
2612 |
* another prefetch (to make it less likely to be evicted). |
|
789 | 2613 |
*/ |
2614 |
if ((buf->b_flags & ARC_PREFETCH) != 0) { |
|
2391 | 2615 |
if (refcount_count(&buf->b_refcnt) == 0) { |
2616 |
ASSERT(list_link_active(&buf->b_arc_node)); |
|
2617 |
} else { |
|
2618 |
buf->b_flags &= ~ARC_PREFETCH; |
|
3403 | 2619 |
ARCSTAT_BUMP(arcstat_mru_hits); |
2391 | 2620 |
} |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2621 |
buf->b_arc_access = now; |
789 | 2622 |
return; |
2623 |
} |
|
2624 |
||
2625 |
/* |
|
2626 |
* This buffer has been "accessed" only once so far, |
|
2627 |
* but it is still in the cache. Move it to the MFU |
|
2628 |
* state. |
|
2629 |
*/ |
|
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2630 |
if (now > buf->b_arc_access + ARC_MINTIME) { |
789 | 2631 |
/* |
2632 |
* More than 125ms have passed since we |
|
2633 |
* instantiated this buffer. Move it to the |
|
2634 |
* most frequently used state. |
|
2635 |
*/ |
|
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2636 |
buf->b_arc_access = now; |
1544 | 2637 |
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, buf); |
3403 | 2638 |
arc_change_state(arc_mfu, buf, hash_lock); |
789 | 2639 |
} |
3403 | 2640 |
ARCSTAT_BUMP(arcstat_mru_hits); |
2641 |
} else if (buf->b_state == arc_mru_ghost) { |
|
789 | 2642 |
arc_state_t *new_state; |
2643 |
/* |
|
2644 |
* This buffer has been "accessed" recently, but |
|
2645 |
* was evicted from the cache. Move it to the |
|
2646 |
* MFU state. |
|
2647 |
*/ |
|
2648 |
||
2649 |
if (buf->b_flags & ARC_PREFETCH) { |
|
3403 | 2650 |
new_state = arc_mru; |
2391 | 2651 |
if (refcount_count(&buf->b_refcnt) > 0) |
2652 |
buf->b_flags &= ~ARC_PREFETCH; |
|
1544 | 2653 |
DTRACE_PROBE1(new_state__mru, arc_buf_hdr_t *, buf); |
789 | 2654 |
} else { |
3403 | 2655 |
new_state = arc_mfu; |
1544 | 2656 |
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, buf); |
789 | 2657 |
} |
2658 |
||
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2659 |
buf->b_arc_access = ddi_get_lbolt(); |
789 | 2660 |
arc_change_state(new_state, buf, hash_lock); |
2661 |
||
3403 | 2662 |
ARCSTAT_BUMP(arcstat_mru_ghost_hits); |
2663 |
} else if (buf->b_state == arc_mfu) { |
|
789 | 2664 |
/* |
2665 |
* This buffer has been accessed more than once and is |
|
2666 |
* still in the cache. Keep it in the MFU state. |
|
2667 |
* |
|
2391 | 2668 |
* NOTE: an add_reference() that occurred when we did |
2669 |
* the arc_read() will have kicked this off the list. |
|
2670 |
* If it was a prefetch, we will explicitly move it to |
|
2671 |
* the head of the list now. |
|
789 | 2672 |
*/ |
2391 | 2673 |
if ((buf->b_flags & ARC_PREFETCH) != 0) { |
2674 |
ASSERT(refcount_count(&buf->b_refcnt) == 0); |
|
2675 |
ASSERT(list_link_active(&buf->b_arc_node)); |
|
2676 |
} |
|
3403 | 2677 |
ARCSTAT_BUMP(arcstat_mfu_hits); |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2678 |
buf->b_arc_access = ddi_get_lbolt(); |
3403 | 2679 |
} else if (buf->b_state == arc_mfu_ghost) { |
2680 |
arc_state_t *new_state = arc_mfu; |
|
789 | 2681 |
/* |
2682 |
* This buffer has been accessed more than once but has |
|
2683 |
* been evicted from the cache. Move it back to the |
|
2684 |
* MFU state. |
|
2685 |
*/ |
|
2686 |
||
2391 | 2687 |
if (buf->b_flags & ARC_PREFETCH) { |
2688 |
/* |
|
2689 |
* This is a prefetch access... |
|
2690 |
* move this block back to the MRU state. |
|
2691 |
*/ |
|
13805
e3a9ae14a119
3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
Madhav Suresh <madhav.suresh@delphix.com>
parents:
13790
diff
changeset
|
2692 |
ASSERT0(refcount_count(&buf->b_refcnt)); |
3403 | 2693 |
new_state = arc_mru; |
2391 | 2694 |
} |
2695 |
||
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2696 |
buf->b_arc_access = ddi_get_lbolt(); |
1544 | 2697 |
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, buf); |
2391 | 2698 |
arc_change_state(new_state, buf, hash_lock); |
789 | 2699 |
|
3403 | 2700 |
ARCSTAT_BUMP(arcstat_mfu_ghost_hits); |
5450 | 2701 |
} else if (buf->b_state == arc_l2c_only) { |
2702 |
/* |
|
2703 |
* This buffer is on the 2nd Level ARC. |
|
2704 |
*/ |
|
2705 |
||
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
2706 |
buf->b_arc_access = ddi_get_lbolt(); |
5450 | 2707 |
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, buf); |
2708 |
arc_change_state(arc_mfu, buf, hash_lock); |
|
789 | 2709 |
} else { |
2710 |
ASSERT(!"invalid arc state"); |
|
2711 |
} |
|
2712 |
} |
|
2713 |
||
2714 |
/* a generic arc_done_func_t which you can use */ |
|
2715 |
/* ARGSUSED */ |
|
2716 |
void |
|
2717 |
arc_bcopy_func(zio_t *zio, arc_buf_t *buf, void *arg) |
|
2718 |
{ |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
2719 |
if (zio == NULL || zio->io_error == 0) |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
2720 |
bcopy(buf->b_data, arg, buf->b_hdr->b_size); |
13973
4972ab336f54
3464 zfs synctask code needs restructuring
Matthew Ahrens <mahrens@delphix.com>
parents:
13958
diff
changeset
|
2721 |
VERIFY(arc_buf_remove_ref(buf, arg)); |
789 | 2722 |
} |
2723 |
||
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
2724 |
/* a generic arc_done_func_t */ |
789 | 2725 |
void |
2726 |
arc_getbuf_func(zio_t *zio, arc_buf_t *buf, void *arg) |
|
2727 |
{ |
|
2728 |
arc_buf_t **bufp = arg; |
|
2729 |
if (zio && zio->io_error) { |
|
13973
4972ab336f54
3464 zfs synctask code needs restructuring
Matthew Ahrens <mahrens@delphix.com>
parents:
13958
diff
changeset
|
2730 |
VERIFY(arc_buf_remove_ref(buf, arg)); |
789 | 2731 |
*bufp = NULL; |
2732 |
} else { |
|
2733 |
*bufp = buf; |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
2734 |
ASSERT(buf->b_data); |
789 | 2735 |
} |
2736 |
} |
|
2737 |
||
2738 |
static void |
|
2739 |
arc_read_done(zio_t *zio) |
|
2740 |
{ |
|
1589
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2741 |
arc_buf_hdr_t *hdr, *found; |
789 | 2742 |
arc_buf_t *buf; |
2743 |
arc_buf_t *abuf; /* buffer we're assigning to callback */ |
|
2744 |
kmutex_t *hash_lock; |
|
2745 |
arc_callback_t *callback_list, *acb; |
|
2746 |
int freeable = FALSE; |
|
2747 |
||
2748 |
buf = zio->io_private; |
|
2749 |
hdr = buf->b_hdr; |
|
2750 |
||
1589
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2751 |
/* |
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2752 |
* The hdr was inserted into hash-table and removed from lists |
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2753 |
* prior to starting I/O. We should find this header, since |
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2754 |
* it's in the hash table, and it should be legit since it's |
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2755 |
* not possible to evict it during the I/O. The only possible |
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2756 |
* reason for it not to be found is if we were freed during the |
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2757 |
* read. |
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2758 |
*/ |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
2759 |
found = buf_hash_find(hdr->b_spa, &hdr->b_dva, hdr->b_birth, |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
2760 |
&hash_lock); |
789 | 2761 |
|
1589
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2762 |
ASSERT((found == NULL && HDR_FREED_IN_READ(hdr) && hash_lock == NULL) || |
5450 | 2763 |
(found == hdr && DVA_EQUAL(&hdr->b_dva, BP_IDENTITY(zio->io_bp))) || |
2764 |
(found == hdr && HDR_L2_READING(hdr))); |
|
2765 |
||
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
2766 |
hdr->b_flags &= ~ARC_L2_EVICTED; |
5450 | 2767 |
if (l2arc_noprefetch && (hdr->b_flags & ARC_PREFETCH)) |
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
2768 |
hdr->b_flags &= ~ARC_L2CACHE; |
789 | 2769 |
|
2770 |
/* byteswap if necessary */ |
|
2771 |
callback_list = hdr->b_acb; |
|
2772 |
ASSERT(callback_list != NULL); |
|
10839
cf83b553a2ab
6836714 arc_read_done may try to byteswap undefined data
William Gorrell <william.gorrell@sun.com>
parents:
10409
diff
changeset
|
2773 |
if (BP_SHOULD_BYTESWAP(zio->io_bp) && zio->io_error == 0) { |
13700
2889e2596bd6
2619 asynchronous destruction of ZFS file systems
Christopher Siden <chris.siden@delphix.com>
parents:
13682
diff
changeset
|
2774 |
dmu_object_byteswap_t bswap = |
2889e2596bd6
2619 asynchronous destruction of ZFS file systems
Christopher Siden <chris.siden@delphix.com>
parents:
13682
diff
changeset
|
2775 |
DMU_OT_BYTESWAP(BP_GET_TYPE(zio->io_bp)); |
7046
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
2776 |
arc_byteswap_func_t *func = BP_GET_LEVEL(zio->io_bp) > 0 ? |
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
2777 |
byteswap_uint64_array : |
13700
2889e2596bd6
2619 asynchronous destruction of ZFS file systems
Christopher Siden <chris.siden@delphix.com>
parents:
13682
diff
changeset
|
2778 |
dmu_ot_byteswap[bswap].ob_func; |
7046
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
2779 |
func(buf->b_data, hdr->b_size); |
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
2780 |
} |
789 | 2781 |
|
5450 | 2782 |
arc_cksum_compute(buf, B_FALSE); |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
2783 |
arc_buf_watch(buf); |
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
2784 |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2785 |
if (hash_lock && zio->io_error == 0 && hdr->b_state == arc_anon) { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2786 |
/* |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2787 |
* Only call arc_access on anonymous buffers. This is because |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2788 |
* if we've issued an I/O for an evicted buffer, we've already |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2789 |
* called arc_access (to prevent any simultaneous readers from |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2790 |
* getting confused). |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2791 |
*/ |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2792 |
arc_access(hdr, hash_lock); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2793 |
} |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2794 |
|
789 | 2795 |
/* create copies of the data buffer for the callers */ |
2796 |
abuf = buf; |
|
2797 |
for (acb = callback_list; acb; acb = acb->acb_next) { |
|
2798 |
if (acb->acb_done) { |
|
13840
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
2799 |
if (abuf == NULL) { |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
2800 |
ARCSTAT_BUMP(arcstat_duplicate_reads); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2801 |
abuf = arc_buf_clone(buf); |
13840
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
2802 |
} |
789 | 2803 |
acb->acb_buf = abuf; |
2804 |
abuf = NULL; |
|
2805 |
} |
|
2806 |
} |
|
2807 |
hdr->b_acb = NULL; |
|
2808 |
hdr->b_flags &= ~ARC_IO_IN_PROGRESS; |
|
1544 | 2809 |
ASSERT(!HDR_BUF_AVAILABLE(hdr)); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2810 |
if (abuf == buf) { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2811 |
ASSERT(buf->b_efunc == NULL); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2812 |
ASSERT(hdr->b_datacnt == 1); |
1544 | 2813 |
hdr->b_flags |= ARC_BUF_AVAILABLE; |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2814 |
} |
789 | 2815 |
|
2816 |
ASSERT(refcount_is_zero(&hdr->b_refcnt) || callback_list != NULL); |
|
2817 |
||
2818 |
if (zio->io_error != 0) { |
|
2819 |
hdr->b_flags |= ARC_IO_ERROR; |
|
3403 | 2820 |
if (hdr->b_state != arc_anon) |
2821 |
arc_change_state(arc_anon, hdr, hash_lock); |
|
1544 | 2822 |
if (HDR_IN_HASH_TABLE(hdr)) |
2823 |
buf_hash_remove(hdr); |
|
789 | 2824 |
freeable = refcount_is_zero(&hdr->b_refcnt); |
2825 |
} |
|
2826 |
||
1544 | 2827 |
/* |
2391 | 2828 |
* Broadcast before we drop the hash_lock to avoid the possibility |
2829 |
* that the hdr (and hence the cv) might be freed before we get to |
|
2830 |
* the cv_broadcast(). |
|
1544 | 2831 |
*/ |
2832 |
cv_broadcast(&hdr->b_cv); |
|
2833 |
||
1589
64c230a17c47
6395526 assertion failed: refcount_count(&ab->b_refcnt) == 1 (0x2 == 0x1)
maybee
parents:
1544
diff
changeset
|
2834 |
if (hash_lock) { |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2835 |
mutex_exit(hash_lock); |
789 | 2836 |
} else { |
2837 |
/* |
|
2838 |
* This block was freed while we waited for the read to |
|
2839 |
* complete. It has been removed from the hash table and |
|
2840 |
* moved to the anonymous state (so that it won't show up |
|
2841 |
* in the cache). |
|
2842 |
*/ |
|
3403 | 2843 |
ASSERT3P(hdr->b_state, ==, arc_anon); |
789 | 2844 |
freeable = refcount_is_zero(&hdr->b_refcnt); |
2845 |
} |
|
2846 |
||
2847 |
/* execute each callback and free its structure */ |
|
2848 |
while ((acb = callback_list) != NULL) { |
|
2849 |
if (acb->acb_done) |
|
2850 |
acb->acb_done(zio, acb->acb_buf, acb->acb_private); |
|
2851 |
||
2852 |
if (acb->acb_zio_dummy != NULL) { |
|
2853 |
acb->acb_zio_dummy->io_error = zio->io_error; |
|
2854 |
zio_nowait(acb->acb_zio_dummy); |
|
2855 |
} |
|
2856 |
||
2857 |
callback_list = acb->acb_next; |
|
2858 |
kmem_free(acb, sizeof (arc_callback_t)); |
|
2859 |
} |
|
2860 |
||
2861 |
if (freeable) |
|
1544 | 2862 |
arc_hdr_destroy(hdr); |
789 | 2863 |
} |
2864 |
||
2865 |
/* |
|
13721
5b51a16a186f
2618 arc.c mistypes in the comments
Bart Coddens <bart.coddens@gmail.com>
parents:
13700
diff
changeset
|
2866 |
* "Read" the block at the specified DVA (in bp) via the |
789 | 2867 |
* cache. If the block is found in the cache, invoke the provided |
2868 |
* callback immediately and return. Note that the `zio' parameter |
|
2869 |
* in the callback will be NULL in this case, since no IO was |
|
2870 |
* required. If the block is not in the cache pass the read request |
|
2871 |
* on to the spa with a substitute callback function, so that the |
|
2872 |
* requested block will be added to the cache. |
|
2873 |
* |
|
2874 |
* If a read request arrives for a block that has a read in-progress, |
|
2875 |
* either wait for the in-progress read to complete (and return the |
|
2876 |
* results); or, if this is a read with a "done" func, add a record |
|
2877 |
* to the read to invoke the "done" func when the read completes, |
|
2878 |
* and return; or just return. |
|
2879 |
* |
|
2880 |
* arc_read_done() will invoke all the requested "done" functions |
|
2881 |
* for readers of this block. |
|
2882 |
*/ |
|
2883 |
int |
|
13941
d48547176ab4
3498 panic in arc_read(): !refcount_is_zero(&pbuf->b_hdr->b_refcnt)
George Wilson <george.wilson@delphix.com>
parents:
13887
diff
changeset
|
2884 |
arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, arc_done_func_t *done, |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
2885 |
void *private, zio_priority_t priority, int zio_flags, uint32_t *arc_flags, |
13941
d48547176ab4
3498 panic in arc_read(): !refcount_is_zero(&pbuf->b_hdr->b_refcnt)
George Wilson <george.wilson@delphix.com>
parents:
13887
diff
changeset
|
2886 |
const zbookmark_t *zb) |
789 | 2887 |
{ |
2888 |
arc_buf_hdr_t *hdr; |
|
13952
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
2889 |
arc_buf_t *buf = NULL; |
789 | 2890 |
kmutex_t *hash_lock; |
5450 | 2891 |
zio_t *rzio; |
13514
417c34452f03
1748 desire support for reguid in zfs
Garrett D'Amore <garrett@nexenta.com>
parents:
13061
diff
changeset
|
2892 |
uint64_t guid = spa_load_guid(spa); |
789 | 2893 |
|
2894 |
top: |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2895 |
hdr = buf_hash_find(guid, BP_IDENTITY(bp), BP_PHYSICAL_BIRTH(bp), |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2896 |
&hash_lock); |
1544 | 2897 |
if (hdr && hdr->b_datacnt > 0) { |
789 | 2898 |
|
2391 | 2899 |
*arc_flags |= ARC_CACHED; |
2900 |
||
789 | 2901 |
if (HDR_IO_IN_PROGRESS(hdr)) { |
2391 | 2902 |
|
2903 |
if (*arc_flags & ARC_WAIT) { |
|
2904 |
cv_wait(&hdr->b_cv, hash_lock); |
|
2905 |
mutex_exit(hash_lock); |
|
2906 |
goto top; |
|
2907 |
} |
|
2908 |
ASSERT(*arc_flags & ARC_NOWAIT); |
|
2909 |
||
2910 |
if (done) { |
|
789 | 2911 |
arc_callback_t *acb = NULL; |
2912 |
||
2913 |
acb = kmem_zalloc(sizeof (arc_callback_t), |
|
2914 |
KM_SLEEP); |
|
2915 |
acb->acb_done = done; |
|
2916 |
acb->acb_private = private; |
|
2917 |
if (pio != NULL) |
|
2918 |
acb->acb_zio_dummy = zio_null(pio, |
|
8632
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
2919 |
spa, NULL, NULL, NULL, zio_flags); |
789 | 2920 |
|
2921 |
ASSERT(acb->acb_done != NULL); |
|
2922 |
acb->acb_next = hdr->b_acb; |
|
2923 |
hdr->b_acb = acb; |
|
2924 |
add_reference(hdr, hash_lock, private); |
|
2925 |
mutex_exit(hash_lock); |
|
2926 |
return (0); |
|
2927 |
} |
|
2928 |
mutex_exit(hash_lock); |
|
2929 |
return (0); |
|
2930 |
} |
|
2931 |
||
3403 | 2932 |
ASSERT(hdr->b_state == arc_mru || hdr->b_state == arc_mfu); |
789 | 2933 |
|
1544 | 2934 |
if (done) { |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2935 |
add_reference(hdr, hash_lock, private); |
1544 | 2936 |
/* |
2937 |
* If this block is already in use, create a new |
|
2938 |
* copy of the data so that we will be guaranteed |
|
2939 |
* that arc_release() will always succeed. |
|
2940 |
*/ |
|
2941 |
buf = hdr->b_buf; |
|
2942 |
ASSERT(buf); |
|
2943 |
ASSERT(buf->b_data); |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2944 |
if (HDR_BUF_AVAILABLE(hdr)) { |
1544 | 2945 |
ASSERT(buf->b_efunc == NULL); |
2946 |
hdr->b_flags &= ~ARC_BUF_AVAILABLE; |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2947 |
} else { |
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2948 |
buf = arc_buf_clone(buf); |
1544 | 2949 |
} |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2950 |
|
2391 | 2951 |
} else if (*arc_flags & ARC_PREFETCH && |
2952 |
refcount_count(&hdr->b_refcnt) == 0) { |
|
2953 |
hdr->b_flags |= ARC_PREFETCH; |
|
789 | 2954 |
} |
2955 |
DTRACE_PROBE1(arc__hit, arc_buf_hdr_t *, hdr); |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2956 |
arc_access(hdr, hash_lock); |
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
2957 |
if (*arc_flags & ARC_L2CACHE) |
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
2958 |
hdr->b_flags |= ARC_L2CACHE; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
2959 |
if (*arc_flags & ARC_L2COMPRESS) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
2960 |
hdr->b_flags |= ARC_L2COMPRESS; |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
2961 |
mutex_exit(hash_lock); |
3403 | 2962 |
ARCSTAT_BUMP(arcstat_hits); |
2963 |
ARCSTAT_CONDSTAT(!(hdr->b_flags & ARC_PREFETCH), |
|
2964 |
demand, prefetch, hdr->b_type != ARC_BUFC_METADATA, |
|
2965 |
data, metadata, hits); |
|
2966 |
||
789 | 2967 |
if (done) |
2968 |
done(NULL, buf, private); |
|
2969 |
} else { |
|
2970 |
uint64_t size = BP_GET_LSIZE(bp); |
|
2971 |
arc_callback_t *acb; |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
2972 |
vdev_t *vd = NULL; |
13952
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
2973 |
uint64_t addr = 0; |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
2974 |
boolean_t devw = B_FALSE; |
789 | 2975 |
|
2976 |
if (hdr == NULL) { |
|
2977 |
/* this block is not in the cache */ |
|
2978 |
arc_buf_hdr_t *exists; |
|
3290 | 2979 |
arc_buf_contents_t type = BP_GET_BUFC_TYPE(bp); |
2980 |
buf = arc_buf_alloc(spa, size, private, type); |
|
789 | 2981 |
hdr = buf->b_hdr; |
2982 |
hdr->b_dva = *BP_IDENTITY(bp); |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
2983 |
hdr->b_birth = BP_PHYSICAL_BIRTH(bp); |
789 | 2984 |
hdr->b_cksum0 = bp->blk_cksum.zc_word[0]; |
2985 |
exists = buf_hash_insert(hdr, &hash_lock); |
|
2986 |
if (exists) { |
|
2987 |
/* somebody beat us to the hash insert */ |
|
2988 |
mutex_exit(hash_lock); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
2989 |
buf_discard_identity(hdr); |
1544 | 2990 |
(void) arc_buf_remove_ref(buf, private); |
789 | 2991 |
goto top; /* restart the IO request */ |
2992 |
} |
|
2391 | 2993 |
/* if this is a prefetch, we don't have a reference */ |
2994 |
if (*arc_flags & ARC_PREFETCH) { |
|
2995 |
(void) remove_reference(hdr, hash_lock, |
|
2996 |
private); |
|
2997 |
hdr->b_flags |= ARC_PREFETCH; |
|
2998 |
} |
|
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
2999 |
if (*arc_flags & ARC_L2CACHE) |
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
3000 |
hdr->b_flags |= ARC_L2CACHE; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3001 |
if (*arc_flags & ARC_L2COMPRESS) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3002 |
hdr->b_flags |= ARC_L2COMPRESS; |
2391 | 3003 |
if (BP_GET_LEVEL(bp) > 0) |
3004 |
hdr->b_flags |= ARC_INDIRECT; |
|
789 | 3005 |
} else { |
3006 |
/* this block is in the ghost cache */ |
|
1544 | 3007 |
ASSERT(GHOST_STATE(hdr->b_state)); |
3008 |
ASSERT(!HDR_IO_IN_PROGRESS(hdr)); |
|
13805
e3a9ae14a119
3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
Madhav Suresh <madhav.suresh@delphix.com>
parents:
13790
diff
changeset
|
3009 |
ASSERT0(refcount_count(&hdr->b_refcnt)); |
2391 | 3010 |
ASSERT(hdr->b_buf == NULL); |
789 | 3011 |
|
2391 | 3012 |
/* if this is a prefetch, we don't have a reference */ |
3013 |
if (*arc_flags & ARC_PREFETCH) |
|
3014 |
hdr->b_flags |= ARC_PREFETCH; |
|
3015 |
else |
|
3016 |
add_reference(hdr, hash_lock, private); |
|
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
3017 |
if (*arc_flags & ARC_L2CACHE) |
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
3018 |
hdr->b_flags |= ARC_L2CACHE; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3019 |
if (*arc_flags & ARC_L2COMPRESS) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3020 |
hdr->b_flags |= ARC_L2COMPRESS; |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3021 |
buf = kmem_cache_alloc(buf_cache, KM_PUSHPAGE); |
1544 | 3022 |
buf->b_hdr = hdr; |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
3023 |
buf->b_data = NULL; |
1544 | 3024 |
buf->b_efunc = NULL; |
3025 |
buf->b_private = NULL; |
|
3026 |
buf->b_next = NULL; |
|
3027 |
hdr->b_buf = buf; |
|
3028 |
ASSERT(hdr->b_datacnt == 0); |
|
3029 |
hdr->b_datacnt = 1; |
|
12033
308d70e4dce8
6935088 elpaso panics: kernel heap corruption detected
William Gorrell <william.gorrell@sun.com>
parents:
11805
diff
changeset
|
3030 |
arc_get_data_buf(buf); |
11805
d83782e908a6
6928826 panic: assertion failed: ab->b_buf == NULL, file: ../../common/fs/zfs/arc.c, line: 1738 - nightly
William Gorrell <william.gorrell@sun.com>
parents:
11712
diff
changeset
|
3031 |
arc_access(hdr, hash_lock); |
789 | 3032 |
} |
3033 |
||
11805
d83782e908a6
6928826 panic: assertion failed: ab->b_buf == NULL, file: ../../common/fs/zfs/arc.c, line: 1738 - nightly
William Gorrell <william.gorrell@sun.com>
parents:
11712
diff
changeset
|
3034 |
ASSERT(!GHOST_STATE(hdr->b_state)); |
d83782e908a6
6928826 panic: assertion failed: ab->b_buf == NULL, file: ../../common/fs/zfs/arc.c, line: 1738 - nightly
William Gorrell <william.gorrell@sun.com>
parents:
11712
diff
changeset
|
3035 |
|
789 | 3036 |
acb = kmem_zalloc(sizeof (arc_callback_t), KM_SLEEP); |
3037 |
acb->acb_done = done; |
|
3038 |
acb->acb_private = private; |
|
3039 |
||
3040 |
ASSERT(hdr->b_acb == NULL); |
|
3041 |
hdr->b_acb = acb; |
|
3042 |
hdr->b_flags |= ARC_IO_IN_PROGRESS; |
|
3043 |
||
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3044 |
if (HDR_L2CACHE(hdr) && hdr->b_l2hdr != NULL && |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3045 |
(vd = hdr->b_l2hdr->b_dev->l2ad_vdev) != NULL) { |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3046 |
devw = hdr->b_l2hdr->b_dev->l2ad_writing; |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3047 |
addr = hdr->b_l2hdr->b_daddr; |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3048 |
/* |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3049 |
* Lock out device removal. |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3050 |
*/ |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3051 |
if (vdev_is_dead(vd) || |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3052 |
!spa_config_tryenter(spa, SCL_L2ARC, vd, RW_READER)) |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3053 |
vd = NULL; |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3054 |
} |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3055 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3056 |
mutex_exit(hash_lock); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3057 |
|
14045
9475b3fef59d
3741 zfs needs better comments
Will Andrews <will@firepipe.net>
parents:
14041
diff
changeset
|
3058 |
/* |
9475b3fef59d
3741 zfs needs better comments
Will Andrews <will@firepipe.net>
parents:
14041
diff
changeset
|
3059 |
* At this point, we have a level 1 cache miss. Try again in |
9475b3fef59d
3741 zfs needs better comments
Will Andrews <will@firepipe.net>
parents:
14041
diff
changeset
|
3060 |
* L2ARC if possible. |
9475b3fef59d
3741 zfs needs better comments
Will Andrews <will@firepipe.net>
parents:
14041
diff
changeset
|
3061 |
*/ |
789 | 3062 |
ASSERT3U(hdr->b_size, ==, size); |
10409
1f7aaa44950d
6876733 sdt:::arc-hit and sdt:::arc-miss provide inconsistent args[0]
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10407
diff
changeset
|
3063 |
DTRACE_PROBE4(arc__miss, arc_buf_hdr_t *, hdr, blkptr_t *, bp, |
1f7aaa44950d
6876733 sdt:::arc-hit and sdt:::arc-miss provide inconsistent args[0]
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10407
diff
changeset
|
3064 |
uint64_t, size, zbookmark_t *, zb); |
3403 | 3065 |
ARCSTAT_BUMP(arcstat_misses); |
3066 |
ARCSTAT_CONDSTAT(!(hdr->b_flags & ARC_PREFETCH), |
|
3067 |
demand, prefetch, hdr->b_type != ARC_BUFC_METADATA, |
|
3068 |
data, metadata, misses); |
|
1544 | 3069 |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3070 |
if (vd != NULL && l2arc_ndev != 0 && !(l2arc_norw && devw)) { |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3071 |
/* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3072 |
* Read from the L2ARC if the following are true: |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3073 |
* 1. The L2ARC vdev was previously cached. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3074 |
* 2. This buffer still has L2ARC metadata. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3075 |
* 3. This buffer isn't currently writing to the L2ARC. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3076 |
* 4. The L2ARC entry wasn't evicted, which may |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3077 |
* also have invalidated the vdev. |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3078 |
* 5. This isn't prefetch and l2arc_noprefetch is set. |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3079 |
*/ |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3080 |
if (hdr->b_l2hdr != NULL && |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3081 |
!HDR_L2_WRITING(hdr) && !HDR_L2_EVICTED(hdr) && |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3082 |
!(l2arc_noprefetch && HDR_PREFETCH(hdr))) { |
5450 | 3083 |
l2arc_read_callback_t *cb; |
3084 |
||
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
3085 |
DTRACE_PROBE1(l2arc__hit, arc_buf_hdr_t *, hdr); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
3086 |
ARCSTAT_BUMP(arcstat_l2_hits); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
3087 |
|
5450 | 3088 |
cb = kmem_zalloc(sizeof (l2arc_read_callback_t), |
3089 |
KM_SLEEP); |
|
3090 |
cb->l2rcb_buf = buf; |
|
3091 |
cb->l2rcb_spa = spa; |
|
3092 |
cb->l2rcb_bp = *bp; |
|
3093 |
cb->l2rcb_zb = *zb; |
|
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
3094 |
cb->l2rcb_flags = zio_flags; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3095 |
cb->l2rcb_compress = hdr->b_l2hdr->b_compress; |
5450 | 3096 |
|
13952
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
3097 |
ASSERT(addr >= VDEV_LABEL_START_SIZE && |
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
3098 |
addr + size < vd->vdev_psize - |
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
3099 |
VDEV_LABEL_END_SIZE); |
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
3100 |
|
5450 | 3101 |
/* |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3102 |
* l2arc read. The SCL_L2ARC lock will be |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3103 |
* released by l2arc_read_done(). |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3104 |
* Issue a null zio if the underlying buffer |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3105 |
* was squashed to zero size by compression. |
5450 | 3106 |
*/ |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3107 |
if (hdr->b_l2hdr->b_compress == |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3108 |
ZIO_COMPRESS_EMPTY) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3109 |
rzio = zio_null(pio, spa, vd, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3110 |
l2arc_read_done, cb, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3111 |
zio_flags | ZIO_FLAG_DONT_CACHE | |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3112 |
ZIO_FLAG_CANFAIL | |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3113 |
ZIO_FLAG_DONT_PROPAGATE | |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3114 |
ZIO_FLAG_DONT_RETRY); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3115 |
} else { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3116 |
rzio = zio_read_phys(pio, vd, addr, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3117 |
hdr->b_l2hdr->b_asize, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3118 |
buf->b_data, ZIO_CHECKSUM_OFF, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3119 |
l2arc_read_done, cb, priority, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3120 |
zio_flags | ZIO_FLAG_DONT_CACHE | |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3121 |
ZIO_FLAG_CANFAIL | |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3122 |
ZIO_FLAG_DONT_PROPAGATE | |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3123 |
ZIO_FLAG_DONT_RETRY, B_FALSE); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3124 |
} |
5450 | 3125 |
DTRACE_PROBE2(l2arc__read, vdev_t *, vd, |
3126 |
zio_t *, rzio); |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3127 |
ARCSTAT_INCR(arcstat_l2_read_bytes, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3128 |
hdr->b_l2hdr->b_asize); |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3129 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3130 |
if (*arc_flags & ARC_NOWAIT) { |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3131 |
zio_nowait(rzio); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3132 |
return (0); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3133 |
} |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3134 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3135 |
ASSERT(*arc_flags & ARC_WAIT); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3136 |
if (zio_wait(rzio) == 0) |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3137 |
return (0); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3138 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3139 |
/* l2arc read error; goto zio_read() */ |
5450 | 3140 |
} else { |
3141 |
DTRACE_PROBE1(l2arc__miss, |
|
3142 |
arc_buf_hdr_t *, hdr); |
|
3143 |
ARCSTAT_BUMP(arcstat_l2_misses); |
|
3144 |
if (HDR_L2_WRITING(hdr)) |
|
3145 |
ARCSTAT_BUMP(arcstat_l2_rw_clash); |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3146 |
spa_config_exit(spa, SCL_L2ARC, vd); |
5450 | 3147 |
} |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3148 |
} else { |
8628
97dcded6e556
6798268 missing spa_config_exit() in L2ARC hangs system
Bill Moore <Bill.Moore@Sun.COM>
parents:
8582
diff
changeset
|
3149 |
if (vd != NULL) |
97dcded6e556
6798268 missing spa_config_exit() in L2ARC hangs system
Bill Moore <Bill.Moore@Sun.COM>
parents:
8582
diff
changeset
|
3150 |
spa_config_exit(spa, SCL_L2ARC, vd); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3151 |
if (l2arc_ndev != 0) { |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3152 |
DTRACE_PROBE1(l2arc__miss, |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3153 |
arc_buf_hdr_t *, hdr); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3154 |
ARCSTAT_BUMP(arcstat_l2_misses); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3155 |
} |
5450 | 3156 |
} |
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
3157 |
|
789 | 3158 |
rzio = zio_read(pio, spa, bp, buf->b_data, size, |
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
3159 |
arc_read_done, buf, priority, zio_flags, zb); |
789 | 3160 |
|
2391 | 3161 |
if (*arc_flags & ARC_WAIT) |
789 | 3162 |
return (zio_wait(rzio)); |
3163 |
||
2391 | 3164 |
ASSERT(*arc_flags & ARC_NOWAIT); |
789 | 3165 |
zio_nowait(rzio); |
3166 |
} |
|
3167 |
return (0); |
|
3168 |
} |
|
3169 |
||
1544 | 3170 |
void |
3171 |
arc_set_callback(arc_buf_t *buf, arc_evict_func_t *func, void *private) |
|
3172 |
{ |
|
3173 |
ASSERT(buf->b_hdr != NULL); |
|
3403 | 3174 |
ASSERT(buf->b_hdr->b_state != arc_anon); |
1544 | 3175 |
ASSERT(!refcount_is_zero(&buf->b_hdr->b_refcnt) || func == NULL); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3176 |
ASSERT(buf->b_efunc == NULL); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3177 |
ASSERT(!HDR_BUF_AVAILABLE(buf->b_hdr)); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3178 |
|
1544 | 3179 |
buf->b_efunc = func; |
3180 |
buf->b_private = private; |
|
3181 |
} |
|
3182 |
||
3183 |
/* |
|
14041
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3184 |
* Notify the arc that a block was freed, and thus will never be used again. |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3185 |
*/ |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3186 |
void |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3187 |
arc_freed(spa_t *spa, const blkptr_t *bp) |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3188 |
{ |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3189 |
arc_buf_hdr_t *hdr; |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3190 |
kmutex_t *hash_lock; |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3191 |
uint64_t guid = spa_load_guid(spa); |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3192 |
|
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3193 |
hdr = buf_hash_find(guid, BP_IDENTITY(bp), BP_PHYSICAL_BIRTH(bp), |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3194 |
&hash_lock); |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3195 |
if (hdr == NULL) |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3196 |
return; |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3197 |
if (HDR_BUF_AVAILABLE(hdr)) { |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3198 |
arc_buf_t *buf = hdr->b_buf; |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3199 |
add_reference(hdr, hash_lock, FTAG); |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3200 |
hdr->b_flags &= ~ARC_BUF_AVAILABLE; |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3201 |
mutex_exit(hash_lock); |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3202 |
|
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3203 |
arc_release(buf, FTAG); |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3204 |
(void) arc_buf_remove_ref(buf, FTAG); |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3205 |
} else { |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3206 |
mutex_exit(hash_lock); |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3207 |
} |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3208 |
|
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3209 |
} |
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3210 |
|
cb4a51285eeb
3805 arc shouldn't cache freed blocks
Matthew Ahrens <mahrens@delphix.com>
parents:
14039
diff
changeset
|
3211 |
/* |
1544 | 3212 |
* This is used by the DMU to let the ARC know that a buffer is |
3213 |
* being evicted, so the ARC should clean up. If this arc buf |
|
3214 |
* is not yet in the evicted state, it will be put there. |
|
3215 |
*/ |
|
3216 |
int |
|
3217 |
arc_buf_evict(arc_buf_t *buf) |
|
3218 |
{ |
|
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
3219 |
arc_buf_hdr_t *hdr; |
1544 | 3220 |
kmutex_t *hash_lock; |
3221 |
arc_buf_t **bufp; |
|
3222 |
||
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3223 |
mutex_enter(&buf->b_evict_lock); |
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
3224 |
hdr = buf->b_hdr; |
1544 | 3225 |
if (hdr == NULL) { |
3226 |
/* |
|
3227 |
* We are in arc_do_user_evicts(). |
|
3228 |
*/ |
|
3229 |
ASSERT(buf->b_data == NULL); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3230 |
mutex_exit(&buf->b_evict_lock); |
1544 | 3231 |
return (0); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3232 |
} else if (buf->b_data == NULL) { |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3233 |
arc_buf_t copy = *buf; /* structure assignment */ |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3234 |
/* |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3235 |
* We are on the eviction list; process this buffer now |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3236 |
* but let arc_do_user_evicts() do the reaping. |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3237 |
*/ |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3238 |
buf->b_efunc = NULL; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3239 |
mutex_exit(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3240 |
VERIFY(copy.b_efunc(©) == 0); |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3241 |
return (1); |
1544 | 3242 |
} |
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
3243 |
hash_lock = HDR_LOCK(hdr); |
1544 | 3244 |
mutex_enter(hash_lock); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3245 |
hdr = buf->b_hdr; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3246 |
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr)); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3247 |
|
2724
99be9a0b86f6
6469119 race between arc_buf_clone() and arc_buf_add_ref() results in NULL pointer dereference
maybee
parents:
2688
diff
changeset
|
3248 |
ASSERT3U(refcount_count(&hdr->b_refcnt), <, hdr->b_datacnt); |
3403 | 3249 |
ASSERT(hdr->b_state == arc_mru || hdr->b_state == arc_mfu); |
1544 | 3250 |
|
3251 |
/* |
|
3252 |
* Pull this buffer off of the hdr |
|
3253 |
*/ |
|
3254 |
bufp = &hdr->b_buf; |
|
3255 |
while (*bufp != buf) |
|
3256 |
bufp = &(*bufp)->b_next; |
|
3257 |
*bufp = buf->b_next; |
|
3258 |
||
3259 |
ASSERT(buf->b_data != NULL); |
|
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
3260 |
arc_buf_destroy(buf, FALSE, FALSE); |
1544 | 3261 |
|
3262 |
if (hdr->b_datacnt == 0) { |
|
3263 |
arc_state_t *old_state = hdr->b_state; |
|
3264 |
arc_state_t *evicted_state; |
|
3265 |
||
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3266 |
ASSERT(hdr->b_buf == NULL); |
1544 | 3267 |
ASSERT(refcount_is_zero(&hdr->b_refcnt)); |
3268 |
||
3269 |
evicted_state = |
|
3403 | 3270 |
(old_state == arc_mru) ? arc_mru_ghost : arc_mfu_ghost; |
1544 | 3271 |
|
3403 | 3272 |
mutex_enter(&old_state->arcs_mtx); |
3273 |
mutex_enter(&evicted_state->arcs_mtx); |
|
1544 | 3274 |
|
3275 |
arc_change_state(evicted_state, hdr, hash_lock); |
|
3276 |
ASSERT(HDR_IN_HASH_TABLE(hdr)); |
|
5450 | 3277 |
hdr->b_flags |= ARC_IN_HASH_TABLE; |
3278 |
hdr->b_flags &= ~ARC_BUF_AVAILABLE; |
|
1544 | 3279 |
|
3403 | 3280 |
mutex_exit(&evicted_state->arcs_mtx); |
3281 |
mutex_exit(&old_state->arcs_mtx); |
|
1544 | 3282 |
} |
3283 |
mutex_exit(hash_lock); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3284 |
mutex_exit(&buf->b_evict_lock); |
1819 | 3285 |
|
1544 | 3286 |
VERIFY(buf->b_efunc(buf) == 0); |
3287 |
buf->b_efunc = NULL; |
|
3288 |
buf->b_private = NULL; |
|
3289 |
buf->b_hdr = NULL; |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3290 |
buf->b_next = NULL; |
1544 | 3291 |
kmem_cache_free(buf_cache, buf); |
3292 |
return (1); |
|
3293 |
} |
|
3294 |
||
789 | 3295 |
/* |
14045
9475b3fef59d
3741 zfs needs better comments
Will Andrews <will@firepipe.net>
parents:
14041
diff
changeset
|
3296 |
* Release this buffer from the cache, making it an anonymous buffer. This |
9475b3fef59d
3741 zfs needs better comments
Will Andrews <will@firepipe.net>
parents:
14041
diff
changeset
|
3297 |
* must be done after a read and prior to modifying the buffer contents. |
789 | 3298 |
* If the buffer has more than one reference, we must make |
7046
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
3299 |
* a new hdr for the buffer. |
789 | 3300 |
*/ |
3301 |
void |
|
3302 |
arc_release(arc_buf_t *buf, void *tag) |
|
3303 |
{ |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3304 |
arc_buf_hdr_t *hdr; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3305 |
kmutex_t *hash_lock = NULL; |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3306 |
l2arc_buf_hdr_t *l2hdr; |
5450 | 3307 |
uint64_t buf_size; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3308 |
|
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3309 |
/* |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3310 |
* It would be nice to assert that if it's DMU metadata (level > |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3311 |
* 0 || it's the dnode file), then it must be syncing context. |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3312 |
* But we don't know that information at this level. |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3313 |
*/ |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3314 |
|
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3315 |
mutex_enter(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3316 |
hdr = buf->b_hdr; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3317 |
|
789 | 3318 |
/* this buffer is not on any list */ |
3319 |
ASSERT(refcount_count(&hdr->b_refcnt) > 0); |
|
3320 |
||
3403 | 3321 |
if (hdr->b_state == arc_anon) { |
789 | 3322 |
/* this buffer is already released */ |
1544 | 3323 |
ASSERT(buf->b_efunc == NULL); |
9274
a10f8bd993c1
6790261 NULL pointer dereference in arc_cksum_equal()
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
9215
diff
changeset
|
3324 |
} else { |
a10f8bd993c1
6790261 NULL pointer dereference in arc_cksum_equal()
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
9215
diff
changeset
|
3325 |
hash_lock = HDR_LOCK(hdr); |
a10f8bd993c1
6790261 NULL pointer dereference in arc_cksum_equal()
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
9215
diff
changeset
|
3326 |
mutex_enter(hash_lock); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3327 |
hdr = buf->b_hdr; |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3328 |
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr)); |
789 | 3329 |
} |
3330 |
||
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3331 |
l2hdr = hdr->b_l2hdr; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3332 |
if (l2hdr) { |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3333 |
mutex_enter(&l2arc_buflist_mtx); |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3334 |
hdr->b_l2hdr = NULL; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3335 |
} |
13952
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
3336 |
buf_size = hdr->b_size; |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3337 |
|
1544 | 3338 |
/* |
3339 |
* Do we have more than one buf? |
|
3340 |
*/ |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3341 |
if (hdr->b_datacnt > 1) { |
789 | 3342 |
arc_buf_hdr_t *nhdr; |
3343 |
arc_buf_t **bufp; |
|
3344 |
uint64_t blksz = hdr->b_size; |
|
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
3345 |
uint64_t spa = hdr->b_spa; |
3290 | 3346 |
arc_buf_contents_t type = hdr->b_type; |
5450 | 3347 |
uint32_t flags = hdr->b_flags; |
789 | 3348 |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3349 |
ASSERT(hdr->b_buf != buf || buf->b_next != NULL); |
789 | 3350 |
/* |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3351 |
* Pull the data off of this hdr and attach it to |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3352 |
* a new anonymous hdr. |
789 | 3353 |
*/ |
1544 | 3354 |
(void) remove_reference(hdr, hash_lock, tag); |
789 | 3355 |
bufp = &hdr->b_buf; |
1544 | 3356 |
while (*bufp != buf) |
789 | 3357 |
bufp = &(*bufp)->b_next; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3358 |
*bufp = buf->b_next; |
3897
278bade789ba
6437750 panic: db->db_buf==0||arc_referenced(db->db_buf), file: dbuf.c,line:1539
maybee
parents:
3718
diff
changeset
|
3359 |
buf->b_next = NULL; |
1544 | 3360 |
|
3403 | 3361 |
ASSERT3U(hdr->b_state->arcs_size, >=, hdr->b_size); |
3362 |
atomic_add_64(&hdr->b_state->arcs_size, -hdr->b_size); |
|
1544 | 3363 |
if (refcount_is_zero(&hdr->b_refcnt)) { |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3364 |
uint64_t *size = &hdr->b_state->arcs_lsize[hdr->b_type]; |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3365 |
ASSERT3U(*size, >=, hdr->b_size); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3366 |
atomic_add_64(size, -hdr->b_size); |
1544 | 3367 |
} |
13840
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3368 |
|
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3369 |
/* |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3370 |
* We're releasing a duplicate user data buffer, update |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3371 |
* our statistics accordingly. |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3372 |
*/ |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3373 |
if (hdr->b_type == ARC_BUFC_DATA) { |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3374 |
ARCSTAT_BUMPDOWN(arcstat_duplicate_buffers); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3375 |
ARCSTAT_INCR(arcstat_duplicate_buffers_size, |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3376 |
-hdr->b_size); |
97fd5cdf328a
3145 single-copy arc
George Wilson <george.wilson@delphix.com>
parents:
13805
diff
changeset
|
3377 |
} |
1544 | 3378 |
hdr->b_datacnt -= 1; |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3379 |
arc_cksum_verify(buf); |
13790
ac6eff781c67
3112 ztest does not honor ZFS_DEBUG
Matthew Ahrens <mahrens@delphix.com>
parents:
13765
diff
changeset
|
3380 |
arc_buf_unwatch(buf); |
1544 | 3381 |
|
789 | 3382 |
mutex_exit(hash_lock); |
3383 |
||
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3384 |
nhdr = kmem_cache_alloc(hdr_cache, KM_PUSHPAGE); |
789 | 3385 |
nhdr->b_size = blksz; |
3386 |
nhdr->b_spa = spa; |
|
3290 | 3387 |
nhdr->b_type = type; |
789 | 3388 |
nhdr->b_buf = buf; |
3403 | 3389 |
nhdr->b_state = arc_anon; |
789 | 3390 |
nhdr->b_arc_access = 0; |
5450 | 3391 |
nhdr->b_flags = flags & ARC_L2_WRITING; |
3392 |
nhdr->b_l2hdr = NULL; |
|
1544 | 3393 |
nhdr->b_datacnt = 1; |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3394 |
nhdr->b_freeze_cksum = NULL; |
3897
278bade789ba
6437750 panic: db->db_buf==0||arc_referenced(db->db_buf), file: dbuf.c,line:1539
maybee
parents:
3718
diff
changeset
|
3395 |
(void) refcount_add(&nhdr->b_refcnt, tag); |
789 | 3396 |
buf->b_hdr = nhdr; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3397 |
mutex_exit(&buf->b_evict_lock); |
3403 | 3398 |
atomic_add_64(&arc_anon->arcs_size, blksz); |
789 | 3399 |
} else { |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3400 |
mutex_exit(&buf->b_evict_lock); |
1544 | 3401 |
ASSERT(refcount_count(&hdr->b_refcnt) == 1); |
789 | 3402 |
ASSERT(!list_link_active(&hdr->b_arc_node)); |
3403 |
ASSERT(!HDR_IO_IN_PROGRESS(hdr)); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3404 |
if (hdr->b_state != arc_anon) |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3405 |
arc_change_state(arc_anon, hdr, hash_lock); |
789 | 3406 |
hdr->b_arc_access = 0; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3407 |
if (hash_lock) |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3408 |
mutex_exit(hash_lock); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3409 |
|
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3410 |
buf_discard_identity(hdr); |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3411 |
arc_buf_thaw(buf); |
789 | 3412 |
} |
1544 | 3413 |
buf->b_efunc = NULL; |
3414 |
buf->b_private = NULL; |
|
5450 | 3415 |
|
3416 |
if (l2hdr) { |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3417 |
ARCSTAT_INCR(arcstat_l2_asize, -l2hdr->b_asize); |
5450 | 3418 |
list_remove(l2hdr->b_dev->l2ad_buflist, hdr); |
3419 |
kmem_free(l2hdr, sizeof (l2arc_buf_hdr_t)); |
|
3420 |
ARCSTAT_INCR(arcstat_l2_size, -buf_size); |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3421 |
mutex_exit(&l2arc_buflist_mtx); |
5450 | 3422 |
} |
789 | 3423 |
} |
3424 |
||
3425 |
int |
|
3426 |
arc_released(arc_buf_t *buf) |
|
3427 |
{ |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3428 |
int released; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3429 |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3430 |
mutex_enter(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3431 |
released = (buf->b_data != NULL && buf->b_hdr->b_state == arc_anon); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3432 |
mutex_exit(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3433 |
return (released); |
1544 | 3434 |
} |
3435 |
||
3436 |
int |
|
3437 |
arc_has_callback(arc_buf_t *buf) |
|
3438 |
{ |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3439 |
int callback; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3440 |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3441 |
mutex_enter(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3442 |
callback = (buf->b_efunc != NULL); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3443 |
mutex_exit(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3444 |
return (callback); |
789 | 3445 |
} |
3446 |
||
1544 | 3447 |
#ifdef ZFS_DEBUG |
3448 |
int |
|
3449 |
arc_referenced(arc_buf_t *buf) |
|
3450 |
{ |
|
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3451 |
int referenced; |
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3452 |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3453 |
mutex_enter(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3454 |
referenced = (refcount_count(&buf->b_hdr->b_refcnt)); |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3455 |
mutex_exit(&buf->b_evict_lock); |
7545
d8ac8023a8e3
6737207 assertion failed: race between arc_release() and arc_referenced()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
7468
diff
changeset
|
3456 |
return (referenced); |
1544 | 3457 |
} |
3458 |
#endif |
|
3459 |
||
789 | 3460 |
static void |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3461 |
arc_write_ready(zio_t *zio) |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3462 |
{ |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3463 |
arc_write_callback_t *callback = zio->io_private; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3464 |
arc_buf_t *buf = callback->awcb_buf; |
5329 | 3465 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
3466 |
||
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3467 |
ASSERT(!refcount_is_zero(&buf->b_hdr->b_refcnt)); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3468 |
callback->awcb_ready(zio, buf, callback->awcb_private); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3469 |
|
5329 | 3470 |
/* |
3471 |
* If the IO is already in progress, then this is a re-write |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3472 |
* attempt, so we need to thaw and re-compute the cksum. |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3473 |
* It is the responsibility of the callback to handle the |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3474 |
* accounting for any re-write attempt. |
5329 | 3475 |
*/ |
3476 |
if (HDR_IO_IN_PROGRESS(hdr)) { |
|
3477 |
mutex_enter(&hdr->b_freeze_lock); |
|
3478 |
if (hdr->b_freeze_cksum != NULL) { |
|
3479 |
kmem_free(hdr->b_freeze_cksum, sizeof (zio_cksum_t)); |
|
3480 |
hdr->b_freeze_cksum = NULL; |
|
3481 |
} |
|
3482 |
mutex_exit(&hdr->b_freeze_lock); |
|
3483 |
} |
|
5450 | 3484 |
arc_cksum_compute(buf, B_FALSE); |
5329 | 3485 |
hdr->b_flags |= ARC_IO_IN_PROGRESS; |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3486 |
} |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3487 |
|
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3488 |
/* |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3489 |
* The SPA calls this callback for each physical write that happens on behalf |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3490 |
* of a logical write. See the comment in dbuf_write_physdone() for details. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3491 |
*/ |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3492 |
static void |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3493 |
arc_write_physdone(zio_t *zio) |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3494 |
{ |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3495 |
arc_write_callback_t *cb = zio->io_private; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3496 |
if (cb->awcb_physdone != NULL) |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3497 |
cb->awcb_physdone(zio, cb->awcb_buf, cb->awcb_private); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3498 |
} |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3499 |
|
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3500 |
static void |
789 | 3501 |
arc_write_done(zio_t *zio) |
3502 |
{ |
|
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3503 |
arc_write_callback_t *callback = zio->io_private; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3504 |
arc_buf_t *buf = callback->awcb_buf; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3505 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
789 | 3506 |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3507 |
ASSERT(hdr->b_acb == NULL); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3508 |
|
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3509 |
if (zio->io_error == 0) { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3510 |
hdr->b_dva = *BP_IDENTITY(zio->io_bp); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3511 |
hdr->b_birth = BP_PHYSICAL_BIRTH(zio->io_bp); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3512 |
hdr->b_cksum0 = zio->io_bp->blk_cksum.zc_word[0]; |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3513 |
} else { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3514 |
ASSERT(BUF_EMPTY(hdr)); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3515 |
} |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3516 |
|
1544 | 3517 |
/* |
3518 |
* If the block to be written was all-zero, we may have |
|
3519 |
* compressed it away. In this case no write was performed |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3520 |
* so there will be no dva/birth/checksum. The buffer must |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
3521 |
* therefore remain anonymous (and uncached). |
1544 | 3522 |
*/ |
789 | 3523 |
if (!BUF_EMPTY(hdr)) { |
3524 |
arc_buf_hdr_t *exists; |
|
3525 |
kmutex_t *hash_lock; |
|
3526 |
||
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3527 |
ASSERT(zio->io_error == 0); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3528 |
|
3093
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
3529 |
arc_cksum_verify(buf); |
71525e4187d5
6490569 verify arc bufs are not modified when they shouldn't be
ahrens
parents:
2918
diff
changeset
|
3530 |
|
789 | 3531 |
exists = buf_hash_insert(hdr, &hash_lock); |
3532 |
if (exists) { |
|
3533 |
/* |
|
3534 |
* This can only happen if we overwrite for |
|
3535 |
* sync-to-convergence, because we remove |
|
3536 |
* buffers from the hash table when we arc_free(). |
|
3537 |
*/ |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3538 |
if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3539 |
if (!BP_EQUAL(&zio->io_bp_orig, zio->io_bp)) |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3540 |
panic("bad overwrite, hdr=%p exists=%p", |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3541 |
(void *)hdr, (void *)exists); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3542 |
ASSERT(refcount_is_zero(&exists->b_refcnt)); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3543 |
arc_change_state(arc_anon, exists, hash_lock); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3544 |
mutex_exit(hash_lock); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3545 |
arc_hdr_destroy(exists); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3546 |
exists = buf_hash_insert(hdr, &hash_lock); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3547 |
ASSERT3P(exists, ==, NULL); |
13887
196932ec9e6a
3236 zio nop-write
George Wilson <george.wilson@delphix.com>
parents:
13840
diff
changeset
|
3548 |
} else if (zio->io_flags & ZIO_FLAG_NOPWRITE) { |
196932ec9e6a
3236 zio nop-write
George Wilson <george.wilson@delphix.com>
parents:
13840
diff
changeset
|
3549 |
/* nopwrite */ |
196932ec9e6a
3236 zio nop-write
George Wilson <george.wilson@delphix.com>
parents:
13840
diff
changeset
|
3550 |
ASSERT(zio->io_prop.zp_nopwrite); |
196932ec9e6a
3236 zio nop-write
George Wilson <george.wilson@delphix.com>
parents:
13840
diff
changeset
|
3551 |
if (!BP_EQUAL(&zio->io_bp_orig, zio->io_bp)) |
196932ec9e6a
3236 zio nop-write
George Wilson <george.wilson@delphix.com>
parents:
13840
diff
changeset
|
3552 |
panic("bad nopwrite, hdr=%p exists=%p", |
196932ec9e6a
3236 zio nop-write
George Wilson <george.wilson@delphix.com>
parents:
13840
diff
changeset
|
3553 |
(void *)hdr, (void *)exists); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3554 |
} else { |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3555 |
/* Dedup */ |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3556 |
ASSERT(hdr->b_datacnt == 1); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3557 |
ASSERT(hdr->b_state == arc_anon); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3558 |
ASSERT(BP_GET_DEDUP(zio->io_bp)); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3559 |
ASSERT(BP_GET_LEVEL(zio->io_bp) == 0); |
10272
a0669934e974
6861581 ZFS frees in synching context during rollback
Matthew Ahrens <Matthew.Ahrens@Sun.COM>
parents:
9816
diff
changeset
|
3560 |
} |
789 | 3561 |
} |
1544 | 3562 |
hdr->b_flags &= ~ARC_IO_IN_PROGRESS; |
7046
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
3563 |
/* if it's not anon, we are doing a scrub */ |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3564 |
if (!exists && hdr->b_state == arc_anon) |
7046
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
3565 |
arc_access(hdr, hash_lock); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
3566 |
mutex_exit(hash_lock); |
1544 | 3567 |
} else { |
3568 |
hdr->b_flags &= ~ARC_IO_IN_PROGRESS; |
|
789 | 3569 |
} |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3570 |
|
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3571 |
ASSERT(!refcount_is_zero(&hdr->b_refcnt)); |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3572 |
callback->awcb_done(zio, buf, callback->awcb_private); |
789 | 3573 |
|
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3574 |
kmem_free(callback, sizeof (arc_write_callback_t)); |
789 | 3575 |
} |
3576 |
||
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3577 |
zio_t * |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3578 |
arc_write(zio_t *pio, spa_t *spa, uint64_t txg, |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3579 |
blkptr_t *bp, arc_buf_t *buf, boolean_t l2arc, boolean_t l2arc_compress, |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3580 |
const zio_prop_t *zp, arc_done_func_t *ready, arc_done_func_t *physdone, |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3581 |
arc_done_func_t *done, void *private, zio_priority_t priority, |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3582 |
int zio_flags, const zbookmark_t *zb) |
789 | 3583 |
{ |
3584 |
arc_buf_hdr_t *hdr = buf->b_hdr; |
|
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3585 |
arc_write_callback_t *callback; |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3586 |
zio_t *zio; |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3587 |
|
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
3588 |
ASSERT(ready != NULL); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3589 |
ASSERT(done != NULL); |
789 | 3590 |
ASSERT(!HDR_IO_ERROR(hdr)); |
2237 | 3591 |
ASSERT((hdr->b_flags & ARC_IO_IN_PROGRESS) == 0); |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3592 |
ASSERT(hdr->b_acb == NULL); |
7237
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
3593 |
if (l2arc) |
f47d41541b14
PSARC 2008/393 zfs primarycache and secondarycache properties
ek110237
parents:
7046
diff
changeset
|
3594 |
hdr->b_flags |= ARC_L2CACHE; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3595 |
if (l2arc_compress) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3596 |
hdr->b_flags |= ARC_L2COMPRESS; |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3597 |
callback = kmem_zalloc(sizeof (arc_write_callback_t), KM_SLEEP); |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3598 |
callback->awcb_ready = ready; |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3599 |
callback->awcb_physdone = physdone; |
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3600 |
callback->awcb_done = done; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3601 |
callback->awcb_private = private; |
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3602 |
callback->awcb_buf = buf; |
7046
361307ae060d
6343667 scrub/resilver has to start over when a snapshot is taken
ahrens
parents:
6987
diff
changeset
|
3603 |
|
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
3604 |
zio = zio_write(pio, spa, txg, bp, buf->b_data, hdr->b_size, zp, |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3605 |
arc_write_ready, arc_write_physdone, arc_write_done, callback, |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3606 |
priority, zio_flags, zb); |
789 | 3607 |
|
3547
e396e0a440b1
6512391 DMU should leverage ZIO dependencies to achieve greater parallelism
maybee
parents:
3403
diff
changeset
|
3608 |
return (zio); |
789 | 3609 |
} |
3610 |
||
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3611 |
static int |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3612 |
arc_memory_throttle(uint64_t reserve, uint64_t txg) |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3613 |
{ |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3614 |
#ifdef _KERNEL |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3615 |
uint64_t available_memory = ptob(freemem); |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3616 |
static uint64_t page_load = 0; |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3617 |
static uint64_t last_txg = 0; |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3618 |
|
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3619 |
#if defined(__i386) |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3620 |
available_memory = |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3621 |
MIN(available_memory, vmem_size(heap_arena, VMEM_FREE)); |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3622 |
#endif |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3623 |
|
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3624 |
if (freemem > physmem * arc_lotsfree_percent / 100) |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3625 |
return (0); |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3626 |
|
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3627 |
if (txg > last_txg) { |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3628 |
last_txg = txg; |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3629 |
page_load = 0; |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3630 |
} |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3631 |
/* |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3632 |
* If we are in pageout, we know that memory is already tight, |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3633 |
* the arc is already going to be evicting, so we just want to |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3634 |
* continue to let page writes occur as quickly as possible. |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3635 |
*/ |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3636 |
if (curproc == proc_pageout) { |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3637 |
if (page_load > MAX(ptob(minfree), available_memory) / 4) |
13980
d7059eb1884c
3598 want to dtrace when errors are generated in zfs
Matthew Ahrens <mahrens@delphix.com>
parents:
13973
diff
changeset
|
3638 |
return (SET_ERROR(ERESTART)); |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3639 |
/* Note: reserve is inflated, so we deflate */ |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3640 |
page_load += reserve / 8; |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3641 |
return (0); |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3642 |
} else if (page_load > 0 && arc_reclaim_needed()) { |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3643 |
/* memory is low, delay before restarting */ |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3644 |
ARCSTAT_INCR(arcstat_memory_throttle_count, 1); |
13980
d7059eb1884c
3598 want to dtrace when errors are generated in zfs
Matthew Ahrens <mahrens@delphix.com>
parents:
13973
diff
changeset
|
3645 |
return (SET_ERROR(EAGAIN)); |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3646 |
} |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3647 |
page_load = 0; |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3648 |
#endif |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3649 |
return (0); |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3650 |
} |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3651 |
|
789 | 3652 |
void |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3653 |
arc_tempreserve_clear(uint64_t reserve) |
789 | 3654 |
{ |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3655 |
atomic_add_64(&arc_tempreserve, -reserve); |
789 | 3656 |
ASSERT((int64_t)arc_tempreserve >= 0); |
3657 |
} |
|
3658 |
||
3659 |
int |
|
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3660 |
arc_tempreserve_space(uint64_t reserve, uint64_t txg) |
789 | 3661 |
{ |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3662 |
int error; |
9412
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3663 |
uint64_t anon_size; |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3664 |
|
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3665 |
if (reserve > arc_c/4 && !arc_no_grow) |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3666 |
arc_c = MIN(arc_c_max, reserve * 4); |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3667 |
if (reserve > arc_c) |
13980
d7059eb1884c
3598 want to dtrace when errors are generated in zfs
Matthew Ahrens <mahrens@delphix.com>
parents:
13973
diff
changeset
|
3668 |
return (SET_ERROR(ENOMEM)); |
982
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3669 |
|
789 | 3670 |
/* |
9412
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3671 |
* Don't count loaned bufs as in flight dirty data to prevent long |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3672 |
* network delays from blocking transactions that are ready to be |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3673 |
* assigned to a txg. |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3674 |
*/ |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3675 |
anon_size = MAX((int64_t)(arc_anon->arcs_size - arc_loaned_bytes), 0); |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3676 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3677 |
/* |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3678 |
* Writes will, almost always, require additional memory allocations |
14046
6a5a2f4a47db
3742 zfs comments need cleaner, more consistent style
Will Andrews <will@firepipe.net>
parents:
14045
diff
changeset
|
3679 |
* in order to compress/encrypt/etc the data. We therefore need to |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3680 |
* make sure that there is sufficient available memory for this. |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3681 |
*/ |
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3682 |
error = arc_memory_throttle(reserve, txg); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3683 |
if (error != 0) |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3684 |
return (error); |
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3685 |
|
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3686 |
/* |
982
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3687 |
* Throttle writes when the amount of dirty data in the cache |
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3688 |
* gets too large. We try to keep the cache less than half full |
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3689 |
* of dirty blocks so that our sync times don't grow too large. |
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3690 |
* Note: if two requests come in concurrently, we might let them |
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3691 |
* both succeed, when one of them should fail. Not a huge deal. |
789 | 3692 |
*/ |
9412
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3693 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3694 |
if (reserve + arc_tempreserve + anon_size > arc_c / 2 && |
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3695 |
anon_size > arc_c / 4) { |
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3696 |
dprintf("failing, arc_tempreserve=%lluK anon_meta=%lluK " |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3697 |
"anon_data=%lluK tempreserve=%lluK arc_c=%lluK\n", |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3698 |
arc_tempreserve>>10, |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3699 |
arc_anon->arcs_lsize[ARC_BUFC_METADATA]>>10, |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3700 |
arc_anon->arcs_lsize[ARC_BUFC_DATA]>>10, |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3701 |
reserve>>10, arc_c>>10); |
13980
d7059eb1884c
3598 want to dtrace when errors are generated in zfs
Matthew Ahrens <mahrens@delphix.com>
parents:
13973
diff
changeset
|
3702 |
return (SET_ERROR(ERESTART)); |
789 | 3703 |
} |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3704 |
atomic_add_64(&arc_tempreserve, reserve); |
789 | 3705 |
return (0); |
3706 |
} |
|
3707 |
||
3708 |
void |
|
3709 |
arc_init(void) |
|
3710 |
{ |
|
3711 |
mutex_init(&arc_reclaim_thr_lock, NULL, MUTEX_DEFAULT, NULL); |
|
3712 |
cv_init(&arc_reclaim_thr_cv, NULL, CV_DEFAULT, NULL); |
|
3713 |
||
2391 | 3714 |
/* Convert seconds to clock ticks */ |
2638
4f583dfeae92
6413510 zfs: writing to ZFS filesystem slows down fsync() on other files in the same FS
perrin
parents:
2391
diff
changeset
|
3715 |
arc_min_prefetch_lifespan = 1 * hz; |
2391 | 3716 |
|
789 | 3717 |
/* Start out with 1/8 of all memory */ |
3403 | 3718 |
arc_c = physmem * PAGESIZE / 8; |
789 | 3719 |
|
3720 |
#ifdef _KERNEL |
|
3721 |
/* |
|
3722 |
* On architectures where the physical memory can be larger |
|
3723 |
* than the addressable space (intel in 32-bit mode), we may |
|
3724 |
* need to limit the cache to 1/8 of VM size. |
|
3725 |
*/ |
|
3403 | 3726 |
arc_c = MIN(arc_c, vmem_size(heap_arena, VMEM_ALLOC | VMEM_FREE) / 8); |
789 | 3727 |
#endif |
3728 |
||
982
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3729 |
/* set min cache to 1/32 of all memory, or 64MB, whichever is more */ |
3403 | 3730 |
arc_c_min = MAX(arc_c / 4, 64<<20); |
982
9bc5c1db9740
6345547 assertion failed: tempreserve < arc.c/4 from zfs_rename
maybee
parents:
789
diff
changeset
|
3731 |
/* set max to 3/4 of all memory, or all but 1GB, whichever is more */ |
3403 | 3732 |
if (arc_c * 8 >= 1<<30) |
3733 |
arc_c_max = (arc_c * 8) - (1<<30); |
|
789 | 3734 |
else |
3403 | 3735 |
arc_c_max = arc_c_min; |
3736 |
arc_c_max = MAX(arc_c * 6, arc_c_max); |
|
2885 | 3737 |
|
3738 |
/* |
|
3739 |
* Allow the tunables to override our calculations if they are |
|
3740 |
* reasonable (ie. over 64MB) |
|
3741 |
*/ |
|
3742 |
if (zfs_arc_max > 64<<20 && zfs_arc_max < physmem * PAGESIZE) |
|
3403 | 3743 |
arc_c_max = zfs_arc_max; |
3744 |
if (zfs_arc_min > 64<<20 && zfs_arc_min <= arc_c_max) |
|
3745 |
arc_c_min = zfs_arc_min; |
|
2885 | 3746 |
|
3403 | 3747 |
arc_c = arc_c_max; |
3748 |
arc_p = (arc_c >> 1); |
|
789 | 3749 |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3750 |
/* limit meta-data to 1/4 of the arc capacity */ |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3751 |
arc_meta_limit = arc_c_max / 4; |
4645 | 3752 |
|
3753 |
/* Allow the tunable to override if it is reasonable */ |
|
3754 |
if (zfs_arc_meta_limit > 0 && zfs_arc_meta_limit <= arc_c_max) |
|
3755 |
arc_meta_limit = zfs_arc_meta_limit; |
|
3756 |
||
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3757 |
if (arc_c_min < arc_meta_limit / 2 && zfs_arc_min == 0) |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3758 |
arc_c_min = arc_meta_limit / 2; |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3759 |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3760 |
if (zfs_arc_grow_retry > 0) |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3761 |
arc_grow_retry = zfs_arc_grow_retry; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3762 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3763 |
if (zfs_arc_shrink_shift > 0) |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3764 |
arc_shrink_shift = zfs_arc_shrink_shift; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3765 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3766 |
if (zfs_arc_p_min_shift > 0) |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3767 |
arc_p_min_shift = zfs_arc_p_min_shift; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
3768 |
|
789 | 3769 |
/* if kmem_flags are set, lets try to use less memory */ |
3770 |
if (kmem_debugging()) |
|
3403 | 3771 |
arc_c = arc_c / 2; |
3772 |
if (arc_c < arc_c_min) |
|
3773 |
arc_c = arc_c_min; |
|
789 | 3774 |
|
3403 | 3775 |
arc_anon = &ARC_anon; |
3776 |
arc_mru = &ARC_mru; |
|
3777 |
arc_mru_ghost = &ARC_mru_ghost; |
|
3778 |
arc_mfu = &ARC_mfu; |
|
3779 |
arc_mfu_ghost = &ARC_mfu_ghost; |
|
5450 | 3780 |
arc_l2c_only = &ARC_l2c_only; |
3403 | 3781 |
arc_size = 0; |
789 | 3782 |
|
3403 | 3783 |
mutex_init(&arc_anon->arcs_mtx, NULL, MUTEX_DEFAULT, NULL); |
3784 |
mutex_init(&arc_mru->arcs_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
3785 |
mutex_init(&arc_mru_ghost->arcs_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
3786 |
mutex_init(&arc_mfu->arcs_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
3787 |
mutex_init(&arc_mfu_ghost->arcs_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
5450 | 3788 |
mutex_init(&arc_l2c_only->arcs_mtx, NULL, MUTEX_DEFAULT, NULL); |
2688
12e2ad22b970
6447701 ZFS hangs when iSCSI Target attempts to initialize its backing store
maybee
parents:
2638
diff
changeset
|
3789 |
|
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3790 |
list_create(&arc_mru->arcs_list[ARC_BUFC_METADATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3791 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3792 |
list_create(&arc_mru->arcs_list[ARC_BUFC_DATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3793 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3794 |
list_create(&arc_mru_ghost->arcs_list[ARC_BUFC_METADATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3795 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3796 |
list_create(&arc_mru_ghost->arcs_list[ARC_BUFC_DATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3797 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3798 |
list_create(&arc_mfu->arcs_list[ARC_BUFC_METADATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3799 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3800 |
list_create(&arc_mfu->arcs_list[ARC_BUFC_DATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3801 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3802 |
list_create(&arc_mfu_ghost->arcs_list[ARC_BUFC_METADATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3803 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3804 |
list_create(&arc_mfu_ghost->arcs_list[ARC_BUFC_DATA], |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3805 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
5450 | 3806 |
list_create(&arc_l2c_only->arcs_list[ARC_BUFC_METADATA], |
3807 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
|
3808 |
list_create(&arc_l2c_only->arcs_list[ARC_BUFC_DATA], |
|
3809 |
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node)); |
|
789 | 3810 |
|
3811 |
buf_init(); |
|
3812 |
||
3813 |
arc_thread_exit = 0; |
|
1544 | 3814 |
arc_eviction_list = NULL; |
3815 |
mutex_init(&arc_eviction_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
2887
eef7119b31c5
6476663 bad trap possible when dereferencing b_hdr after buf eviction
maybee
parents:
2885
diff
changeset
|
3816 |
bzero(&arc_eviction_hdr, sizeof (arc_buf_hdr_t)); |
789 | 3817 |
|
3403 | 3818 |
arc_ksp = kstat_create("zfs", 0, "arcstats", "misc", KSTAT_TYPE_NAMED, |
3819 |
sizeof (arc_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL); |
|
3820 |
||
3821 |
if (arc_ksp != NULL) { |
|
3822 |
arc_ksp->ks_data = &arc_stats; |
|
3823 |
kstat_install(arc_ksp); |
|
3824 |
} |
|
3825 |
||
789 | 3826 |
(void) thread_create(NULL, 0, arc_reclaim_thread, NULL, 0, &p0, |
3827 |
TS_RUN, minclsyspri); |
|
3158
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
3828 |
|
f30a3849aa23
6493923 nfsfind on ZFS filesystem quickly depletes memory in a 1GB system
maybee
parents:
3093
diff
changeset
|
3829 |
arc_dead = FALSE; |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3830 |
arc_warm = B_FALSE; |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
3831 |
|
14167
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3832 |
/* |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3833 |
* Calculate maximum amount of dirty data per pool. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3834 |
* |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3835 |
* If it has been set by /etc/system, take that. |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3836 |
* Otherwise, use a percentage of physical memory defined by |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3837 |
* zfs_dirty_data_max_percent (default 10%) with a cap at |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3838 |
* zfs_dirty_data_max_max (default 4GB). |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3839 |
*/ |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3840 |
if (zfs_dirty_data_max == 0) { |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3841 |
zfs_dirty_data_max = physmem * PAGESIZE * |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3842 |
zfs_dirty_data_max_percent / 100; |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3843 |
zfs_dirty_data_max = MIN(zfs_dirty_data_max, |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3844 |
zfs_dirty_data_max_max); |
dceb17481b99
4045 zfs write throttle & i/o scheduler performance work
Matthew Ahrens <mahrens@delphix.com>
parents:
14046
diff
changeset
|
3845 |
} |
789 | 3846 |
} |
3847 |
||
3848 |
void |
|
3849 |
arc_fini(void) |
|
3850 |
{ |
|
3851 |
mutex_enter(&arc_reclaim_thr_lock); |
|
3852 |
arc_thread_exit = 1; |
|
3853 |
while (arc_thread_exit != 0) |
|
3854 |
cv_wait(&arc_reclaim_thr_cv, &arc_reclaim_thr_lock); |
|
3855 |
mutex_exit(&arc_reclaim_thr_lock); |
|
3856 |
||
5642
504c84876fda
6513209 Destroying pools under stress caused a hang in arc_flush
maybee
parents:
5450
diff
changeset
|
3857 |
arc_flush(NULL); |
789 | 3858 |
|
3859 |
arc_dead = TRUE; |
|
3860 |
||
3403 | 3861 |
if (arc_ksp != NULL) { |
3862 |
kstat_delete(arc_ksp); |
|
3863 |
arc_ksp = NULL; |
|
3864 |
} |
|
3865 |
||
1544 | 3866 |
mutex_destroy(&arc_eviction_mtx); |
789 | 3867 |
mutex_destroy(&arc_reclaim_thr_lock); |
3868 |
cv_destroy(&arc_reclaim_thr_cv); |
|
3869 |
||
4309
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3870 |
list_destroy(&arc_mru->arcs_list[ARC_BUFC_METADATA]); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3871 |
list_destroy(&arc_mru_ghost->arcs_list[ARC_BUFC_METADATA]); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3872 |
list_destroy(&arc_mfu->arcs_list[ARC_BUFC_METADATA]); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3873 |
list_destroy(&arc_mfu_ghost->arcs_list[ARC_BUFC_METADATA]); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3874 |
list_destroy(&arc_mru->arcs_list[ARC_BUFC_DATA]); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3875 |
list_destroy(&arc_mru_ghost->arcs_list[ARC_BUFC_DATA]); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3876 |
list_destroy(&arc_mfu->arcs_list[ARC_BUFC_DATA]); |
3dfde0f4662d
6542676 ARC needs to track meta-data memory overhead
maybee
parents:
3897
diff
changeset
|
3877 |
list_destroy(&arc_mfu_ghost->arcs_list[ARC_BUFC_DATA]); |
789 | 3878 |
|
3403 | 3879 |
mutex_destroy(&arc_anon->arcs_mtx); |
3880 |
mutex_destroy(&arc_mru->arcs_mtx); |
|
3881 |
mutex_destroy(&arc_mru_ghost->arcs_mtx); |
|
3882 |
mutex_destroy(&arc_mfu->arcs_mtx); |
|
3883 |
mutex_destroy(&arc_mfu_ghost->arcs_mtx); |
|
8214
d7abf7c1f1c1
6747934 Some locking variables are not properly initialized or destroyed
Ricardo M. Correia <Ricardo.M.Correia@Sun.COM>
parents:
8213
diff
changeset
|
3884 |
mutex_destroy(&arc_l2c_only->arcs_mtx); |
2856 | 3885 |
|
789 | 3886 |
buf_fini(); |
9412
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3887 |
|
4aefd8704ce0
6717022 ZFS DMU needs zero-copy support
Aleksandr Guzovskiy <Aleksandr.Guzovskiy@Sun.COM>
parents:
9396
diff
changeset
|
3888 |
ASSERT(arc_loaned_bytes == 0); |
789 | 3889 |
} |
5450 | 3890 |
|
3891 |
/* |
|
3892 |
* Level 2 ARC |
|
3893 |
* |
|
3894 |
* The level 2 ARC (L2ARC) is a cache layer in-between main memory and disk. |
|
3895 |
* It uses dedicated storage devices to hold cached data, which are populated |
|
3896 |
* using large infrequent writes. The main role of this cache is to boost |
|
3897 |
* the performance of random read workloads. The intended L2ARC devices |
|
3898 |
* include short-stroked disks, solid state disks, and other media with |
|
3899 |
* substantially faster read latency than disk. |
|
3900 |
* |
|
3901 |
* +-----------------------+ |
|
3902 |
* | ARC | |
|
3903 |
* +-----------------------+ |
|
3904 |
* | ^ ^ |
|
3905 |
* | | | |
|
3906 |
* l2arc_feed_thread() arc_read() |
|
3907 |
* | | | |
|
3908 |
* | l2arc read | |
|
3909 |
* V | | |
|
3910 |
* +---------------+ | |
|
3911 |
* | L2ARC | | |
|
3912 |
* +---------------+ | |
|
3913 |
* | ^ | |
|
3914 |
* l2arc_write() | | |
|
3915 |
* | | | |
|
3916 |
* V | | |
|
3917 |
* +-------+ +-------+ |
|
3918 |
* | vdev | | vdev | |
|
3919 |
* | cache | | cache | |
|
3920 |
* +-------+ +-------+ |
|
3921 |
* +=========+ .-----. |
|
3922 |
* : L2ARC : |-_____-| |
|
3923 |
* : devices : | Disks | |
|
3924 |
* +=========+ `-_____-' |
|
3925 |
* |
|
3926 |
* Read requests are satisfied from the following sources, in order: |
|
3927 |
* |
|
3928 |
* 1) ARC |
|
3929 |
* 2) vdev cache of L2ARC devices |
|
3930 |
* 3) L2ARC devices |
|
3931 |
* 4) vdev cache of disks |
|
3932 |
* 5) disks |
|
3933 |
* |
|
3934 |
* Some L2ARC device types exhibit extremely slow write performance. |
|
3935 |
* To accommodate for this there are some significant differences between |
|
3936 |
* the L2ARC and traditional cache design: |
|
3937 |
* |
|
3938 |
* 1. There is no eviction path from the ARC to the L2ARC. Evictions from |
|
3939 |
* the ARC behave as usual, freeing buffers and placing headers on ghost |
|
3940 |
* lists. The ARC does not send buffers to the L2ARC during eviction as |
|
3941 |
* this would add inflated write latencies for all ARC memory pressure. |
|
3942 |
* |
|
3943 |
* 2. The L2ARC attempts to cache data from the ARC before it is evicted. |
|
3944 |
* It does this by periodically scanning buffers from the eviction-end of |
|
3945 |
* the MFU and MRU ARC lists, copying them to the L2ARC devices if they are |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3946 |
* not already there. It scans until a headroom of buffers is satisfied, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3947 |
* which itself is a buffer for ARC eviction. If a compressible buffer is |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3948 |
* found during scanning and selected for writing to an L2ARC device, we |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3949 |
* temporarily boost scanning headroom during the next scan cycle to make |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3950 |
* sure we adapt to compression effects (which might significantly reduce |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
3951 |
* the data volume we write to L2ARC). The thread that does this is |
5450 | 3952 |
* l2arc_feed_thread(), illustrated below; example sizes are included to |
3953 |
* provide a better sense of ratio than this diagram: |
|
3954 |
* |
|
3955 |
* head --> tail |
|
3956 |
* +---------------------+----------+ |
|
3957 |
* ARC_mfu |:::::#:::::::::::::::|o#o###o###|-->. # already on L2ARC |
|
3958 |
* +---------------------+----------+ | o L2ARC eligible |
|
3959 |
* ARC_mru |:#:::::::::::::::::::|#o#ooo####|-->| : ARC buffer |
|
3960 |
* +---------------------+----------+ | |
|
3961 |
* 15.9 Gbytes ^ 32 Mbytes | |
|
3962 |
* headroom | |
|
3963 |
* l2arc_feed_thread() |
|
3964 |
* | |
|
3965 |
* l2arc write hand <--[oooo]--' |
|
3966 |
* | 8 Mbyte |
|
3967 |
* | write max |
|
3968 |
* V |
|
3969 |
* +==============================+ |
|
3970 |
* L2ARC dev |####|#|###|###| |####| ... | |
|
3971 |
* +==============================+ |
|
3972 |
* 32 Gbytes |
|
3973 |
* |
|
3974 |
* 3. If an ARC buffer is copied to the L2ARC but then hit instead of |
|
3975 |
* evicted, then the L2ARC has cached a buffer much sooner than it probably |
|
3976 |
* needed to, potentially wasting L2ARC device bandwidth and storage. It is |
|
3977 |
* safe to say that this is an uncommon case, since buffers at the end of |
|
3978 |
* the ARC lists have moved there due to inactivity. |
|
3979 |
* |
|
3980 |
* 4. If the ARC evicts faster than the L2ARC can maintain a headroom, |
|
3981 |
* then the L2ARC simply misses copying some buffers. This serves as a |
|
3982 |
* pressure valve to prevent heavy read workloads from both stalling the ARC |
|
3983 |
* with waits and clogging the L2ARC with writes. This also helps prevent |
|
3984 |
* the potential for the L2ARC to churn if it attempts to cache content too |
|
3985 |
* quickly, such as during backups of the entire pool. |
|
3986 |
* |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3987 |
* 5. After system boot and before the ARC has filled main memory, there are |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3988 |
* no evictions from the ARC and so the tails of the ARC_mfu and ARC_mru |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3989 |
* lists can remain mostly static. Instead of searching from tail of these |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3990 |
* lists as pictured, the l2arc_feed_thread() will search from the list heads |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3991 |
* for eligible buffers, greatly increasing its chance of finding them. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3992 |
* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3993 |
* The L2ARC device write speed is also boosted during this time so that |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3994 |
* the L2ARC warms up faster. Since there have been no ARC evictions yet, |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3995 |
* there are no L2ARC reads, and no fear of degrading read performance |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3996 |
* through increased writes. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3997 |
* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
3998 |
* 6. Writes to the L2ARC devices are grouped and sent in-sequence, so that |
5450 | 3999 |
* the vdev queue can aggregate them into larger and fewer writes. Each |
4000 |
* device is written to in a rotor fashion, sweeping writes through |
|
4001 |
* available space then repeating. |
|
4002 |
* |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4003 |
* 7. The L2ARC does not store dirty content. It never needs to flush |
5450 | 4004 |
* write buffers back to disk based storage. |
4005 |
* |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4006 |
* 8. If an ARC buffer is written (and dirtied) which also exists in the |
5450 | 4007 |
* L2ARC, the now stale L2ARC buffer is immediately dropped. |
4008 |
* |
|
4009 |
* The performance of the L2ARC can be tweaked by a number of tunables, which |
|
4010 |
* may be necessary for different workloads: |
|
4011 |
* |
|
4012 |
* l2arc_write_max max write bytes per interval |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4013 |
* l2arc_write_boost extra write bytes during device warmup |
5450 | 4014 |
* l2arc_noprefetch skip caching prefetched buffers |
4015 |
* l2arc_headroom number of max device writes to precache |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4016 |
* l2arc_headroom_boost when we find compressed buffers during ARC |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4017 |
* scanning, we multiply headroom by this |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4018 |
* percentage factor for the next scan cycle, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4019 |
* since more compressed buffers are likely to |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4020 |
* be present |
5450 | 4021 |
* l2arc_feed_secs seconds between L2ARC writing |
4022 |
* |
|
4023 |
* Tunables may be removed or added as future performance improvements are |
|
4024 |
* integrated, and also may become zpool properties. |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4025 |
* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4026 |
* There are three key functions that control how the L2ARC warms up: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4027 |
* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4028 |
* l2arc_write_eligible() check if a buffer is eligible to cache |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4029 |
* l2arc_write_size() calculate how much to write |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4030 |
* l2arc_write_interval() calculate sleep delay between writes |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4031 |
* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4032 |
* These three functions determine what to write, how much, and how quickly |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4033 |
* to send writes. |
5450 | 4034 |
*/ |
4035 |
||
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4036 |
static boolean_t |
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
4037 |
l2arc_write_eligible(uint64_t spa_guid, arc_buf_hdr_t *ab) |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4038 |
{ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4039 |
/* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4040 |
* A buffer is *not* eligible for the L2ARC if it: |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4041 |
* 1. belongs to a different spa. |
10357
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
4042 |
* 2. is already cached on the L2ARC. |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
4043 |
* 3. has an I/O in progress (it may be an incomplete read). |
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
4044 |
* 4. is flagged not eligible (zfs property). |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4045 |
*/ |
10357
29060492b29d
6871680 kstats for ARC evicted bytes by L2ARC state
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
10272
diff
changeset
|
4046 |
if (ab->b_spa != spa_guid || ab->b_l2hdr != NULL || |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4047 |
HDR_IO_IN_PROGRESS(ab) || !HDR_L2CACHE(ab)) |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4048 |
return (B_FALSE); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4049 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4050 |
return (B_TRUE); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4051 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4052 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4053 |
static uint64_t |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4054 |
l2arc_write_size(void) |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4055 |
{ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4056 |
uint64_t size; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4057 |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4058 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4059 |
* Make sure our globals have meaningful values in case the user |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4060 |
* altered them. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4061 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4062 |
size = l2arc_write_max; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4063 |
if (size == 0) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4064 |
cmn_err(CE_NOTE, "Bad value for l2arc_write_max, value must " |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4065 |
"be greater than zero, resetting it to the default (%d)", |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4066 |
L2ARC_WRITE_SIZE); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4067 |
size = l2arc_write_max = L2ARC_WRITE_SIZE; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4068 |
} |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4069 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4070 |
if (arc_warm == B_FALSE) |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4071 |
size += l2arc_write_boost; |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4072 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4073 |
return (size); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4074 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4075 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4076 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4077 |
static clock_t |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4078 |
l2arc_write_interval(clock_t began, uint64_t wanted, uint64_t wrote) |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4079 |
{ |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
4080 |
clock_t interval, next, now; |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4081 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4082 |
/* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4083 |
* If the ARC lists are busy, increase our write rate; if the |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4084 |
* lists are stale, idle back. This is achieved by checking |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4085 |
* how much we previously wrote - if it was more than half of |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4086 |
* what we wanted, schedule the next write much sooner. |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4087 |
*/ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4088 |
if (l2arc_feed_again && wrote > (wanted / 2)) |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4089 |
interval = (hz * l2arc_feed_min_ms) / 1000; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4090 |
else |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4091 |
interval = hz * l2arc_feed_secs; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4092 |
|
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
4093 |
now = ddi_get_lbolt(); |
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
4094 |
next = MAX(now, MIN(now + interval, began + interval)); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4095 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4096 |
return (next); |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4097 |
} |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4098 |
|
5450 | 4099 |
static void |
4100 |
l2arc_hdr_stat_add(void) |
|
4101 |
{ |
|
6018
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
4102 |
ARCSTAT_INCR(arcstat_l2_hdr_size, HDR_SIZE + L2HDR_SIZE); |
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
4103 |
ARCSTAT_INCR(arcstat_hdr_size, -HDR_SIZE); |
5450 | 4104 |
} |
4105 |
||
4106 |
static void |
|
4107 |
l2arc_hdr_stat_remove(void) |
|
4108 |
{ |
|
6018
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
4109 |
ARCSTAT_INCR(arcstat_l2_hdr_size, -(HDR_SIZE + L2HDR_SIZE)); |
109fdf2d7ad7
6628084 Incorrect error message when trying to upgrade a v10 pool
brendan
parents:
5642
diff
changeset
|
4110 |
ARCSTAT_INCR(arcstat_hdr_size, HDR_SIZE); |
5450 | 4111 |
} |
4112 |
||
4113 |
/* |
|
4114 |
* Cycle through L2ARC devices. This is how L2ARC load balances. |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4115 |
* If a device is returned, this also returns holding the spa config lock. |
5450 | 4116 |
*/ |
4117 |
static l2arc_dev_t * |
|
4118 |
l2arc_dev_get_next(void) |
|
4119 |
{ |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4120 |
l2arc_dev_t *first, *next = NULL; |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4121 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4122 |
/* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4123 |
* Lock out the removal of spas (spa_namespace_lock), then removal |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4124 |
* of cache devices (l2arc_dev_mtx). Once a device has been selected, |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4125 |
* both locks will be dropped and a spa config lock held instead. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4126 |
*/ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4127 |
mutex_enter(&spa_namespace_lock); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4128 |
mutex_enter(&l2arc_dev_mtx); |
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4129 |
|
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4130 |
/* if there are no vdevs, there is nothing to do */ |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4131 |
if (l2arc_ndev == 0) |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4132 |
goto out; |
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4133 |
|
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4134 |
first = NULL; |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4135 |
next = l2arc_dev_last; |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4136 |
do { |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4137 |
/* loop around the list looking for a non-faulted vdev */ |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4138 |
if (next == NULL) { |
5450 | 4139 |
next = list_head(l2arc_dev_list); |
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4140 |
} else { |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4141 |
next = list_next(l2arc_dev_list, next); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4142 |
if (next == NULL) |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4143 |
next = list_head(l2arc_dev_list); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4144 |
} |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4145 |
|
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4146 |
/* if we have come back to the start, bail out */ |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4147 |
if (first == NULL) |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4148 |
first = next; |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4149 |
else if (next == first) |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4150 |
break; |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4151 |
|
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4152 |
} while (vdev_is_dead(next->l2ad_vdev)); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4153 |
|
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4154 |
/* if we were unable to find any usable vdevs, return NULL */ |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4155 |
if (vdev_is_dead(next->l2ad_vdev)) |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4156 |
next = NULL; |
5450 | 4157 |
|
4158 |
l2arc_dev_last = next; |
|
4159 |
||
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4160 |
out: |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4161 |
mutex_exit(&l2arc_dev_mtx); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4162 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4163 |
/* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4164 |
* Grab the config lock to prevent the 'next' device from being |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4165 |
* removed while we are writing to it. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4166 |
*/ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4167 |
if (next != NULL) |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4168 |
spa_config_enter(next->l2ad_spa, SCL_L2ARC, next, RW_READER); |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4169 |
mutex_exit(&spa_namespace_lock); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4170 |
|
5450 | 4171 |
return (next); |
4172 |
} |
|
4173 |
||
4174 |
/* |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4175 |
* Free buffers that were tagged for destruction. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4176 |
*/ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4177 |
static void |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4178 |
l2arc_do_free_on_write() |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4179 |
{ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4180 |
list_t *buflist; |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4181 |
l2arc_data_free_t *df, *df_prev; |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4182 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4183 |
mutex_enter(&l2arc_free_on_write_mtx); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4184 |
buflist = l2arc_free_on_write; |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4185 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4186 |
for (df = list_tail(buflist); df; df = df_prev) { |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4187 |
df_prev = list_prev(buflist, df); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4188 |
ASSERT(df->l2df_data != NULL); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4189 |
ASSERT(df->l2df_func != NULL); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4190 |
df->l2df_func(df->l2df_data, df->l2df_size); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4191 |
list_remove(buflist, df); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4192 |
kmem_free(df, sizeof (l2arc_data_free_t)); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4193 |
} |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4194 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4195 |
mutex_exit(&l2arc_free_on_write_mtx); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4196 |
} |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4197 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4198 |
/* |
5450 | 4199 |
* A write to a cache device has completed. Update all headers to allow |
4200 |
* reads from these buffers to begin. |
|
4201 |
*/ |
|
4202 |
static void |
|
4203 |
l2arc_write_done(zio_t *zio) |
|
4204 |
{ |
|
4205 |
l2arc_write_callback_t *cb; |
|
4206 |
l2arc_dev_t *dev; |
|
4207 |
list_t *buflist; |
|
4208 |
arc_buf_hdr_t *head, *ab, *ab_prev; |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4209 |
l2arc_buf_hdr_t *abl2; |
5450 | 4210 |
kmutex_t *hash_lock; |
4211 |
||
4212 |
cb = zio->io_private; |
|
4213 |
ASSERT(cb != NULL); |
|
4214 |
dev = cb->l2wcb_dev; |
|
4215 |
ASSERT(dev != NULL); |
|
4216 |
head = cb->l2wcb_head; |
|
4217 |
ASSERT(head != NULL); |
|
4218 |
buflist = dev->l2ad_buflist; |
|
4219 |
ASSERT(buflist != NULL); |
|
4220 |
DTRACE_PROBE2(l2arc__iodone, zio_t *, zio, |
|
4221 |
l2arc_write_callback_t *, cb); |
|
4222 |
||
4223 |
if (zio->io_error != 0) |
|
4224 |
ARCSTAT_BUMP(arcstat_l2_writes_error); |
|
4225 |
||
4226 |
mutex_enter(&l2arc_buflist_mtx); |
|
4227 |
||
4228 |
/* |
|
4229 |
* All writes completed, or an error was hit. |
|
4230 |
*/ |
|
4231 |
for (ab = list_prev(buflist, head); ab; ab = ab_prev) { |
|
4232 |
ab_prev = list_prev(buflist, ab); |
|
4233 |
||
4234 |
hash_lock = HDR_LOCK(ab); |
|
4235 |
if (!mutex_tryenter(hash_lock)) { |
|
4236 |
/* |
|
4237 |
* This buffer misses out. It may be in a stage |
|
4238 |
* of eviction. Its ARC_L2_WRITING flag will be |
|
4239 |
* left set, denying reads to this buffer. |
|
4240 |
*/ |
|
4241 |
ARCSTAT_BUMP(arcstat_l2_writes_hdr_miss); |
|
4242 |
continue; |
|
4243 |
} |
|
4244 |
||
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4245 |
abl2 = ab->b_l2hdr; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4246 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4247 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4248 |
* Release the temporary compressed buffer as soon as possible. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4249 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4250 |
if (abl2->b_compress != ZIO_COMPRESS_OFF) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4251 |
l2arc_release_cdata_buf(ab); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4252 |
|
5450 | 4253 |
if (zio->io_error != 0) { |
4254 |
/* |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4255 |
* Error - drop L2ARC entry. |
5450 | 4256 |
*/ |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4257 |
list_remove(buflist, ab); |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4258 |
ARCSTAT_INCR(arcstat_l2_asize, -abl2->b_asize); |
5450 | 4259 |
ab->b_l2hdr = NULL; |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4260 |
kmem_free(abl2, sizeof (l2arc_buf_hdr_t)); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4261 |
ARCSTAT_INCR(arcstat_l2_size, -ab->b_size); |
5450 | 4262 |
} |
4263 |
||
4264 |
/* |
|
4265 |
* Allow ARC to begin reads to this L2ARC entry. |
|
4266 |
*/ |
|
4267 |
ab->b_flags &= ~ARC_L2_WRITING; |
|
4268 |
||
4269 |
mutex_exit(hash_lock); |
|
4270 |
} |
|
4271 |
||
4272 |
atomic_inc_64(&l2arc_writes_done); |
|
4273 |
list_remove(buflist, head); |
|
4274 |
kmem_cache_free(hdr_cache, head); |
|
4275 |
mutex_exit(&l2arc_buflist_mtx); |
|
4276 |
||
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4277 |
l2arc_do_free_on_write(); |
5450 | 4278 |
|
4279 |
kmem_free(cb, sizeof (l2arc_write_callback_t)); |
|
4280 |
} |
|
4281 |
||
4282 |
/* |
|
4283 |
* A read to a cache device completed. Validate buffer contents before |
|
4284 |
* handing over to the regular ARC routines. |
|
4285 |
*/ |
|
4286 |
static void |
|
4287 |
l2arc_read_done(zio_t *zio) |
|
4288 |
{ |
|
4289 |
l2arc_read_callback_t *cb; |
|
4290 |
arc_buf_hdr_t *hdr; |
|
4291 |
arc_buf_t *buf; |
|
4292 |
kmutex_t *hash_lock; |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4293 |
int equal; |
5450 | 4294 |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4295 |
ASSERT(zio->io_vd != NULL); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4296 |
ASSERT(zio->io_flags & ZIO_FLAG_DONT_PROPAGATE); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4297 |
|
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4298 |
spa_config_exit(zio->io_spa, SCL_L2ARC, zio->io_vd); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4299 |
|
5450 | 4300 |
cb = zio->io_private; |
4301 |
ASSERT(cb != NULL); |
|
4302 |
buf = cb->l2rcb_buf; |
|
4303 |
ASSERT(buf != NULL); |
|
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
4304 |
|
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
4305 |
hash_lock = HDR_LOCK(buf->b_hdr); |
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
4306 |
mutex_enter(hash_lock); |
5450 | 4307 |
hdr = buf->b_hdr; |
12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
12033
diff
changeset
|
4308 |
ASSERT3P(hash_lock, ==, HDR_LOCK(hdr)); |
5450 | 4309 |
|
4310 |
/* |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4311 |
* If the buffer was compressed, decompress it first. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4312 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4313 |
if (cb->l2rcb_compress != ZIO_COMPRESS_OFF) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4314 |
l2arc_decompress_zio(zio, hdr, cb->l2rcb_compress); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4315 |
ASSERT(zio->io_data != NULL); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4316 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4317 |
/* |
5450 | 4318 |
* Check this survived the L2ARC journey. |
4319 |
*/ |
|
4320 |
equal = arc_cksum_equal(buf); |
|
4321 |
if (equal && zio->io_error == 0 && !HDR_L2_EVICTED(hdr)) { |
|
4322 |
mutex_exit(hash_lock); |
|
4323 |
zio->io_private = buf; |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4324 |
zio->io_bp_copy = cb->l2rcb_bp; /* XXX fix in L2ARC 2.0 */ |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4325 |
zio->io_bp = &zio->io_bp_copy; /* XXX fix in L2ARC 2.0 */ |
5450 | 4326 |
arc_read_done(zio); |
4327 |
} else { |
|
4328 |
mutex_exit(hash_lock); |
|
4329 |
/* |
|
4330 |
* Buffer didn't survive caching. Increment stats and |
|
4331 |
* reissue to the original storage device. |
|
4332 |
*/ |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4333 |
if (zio->io_error != 0) { |
5450 | 4334 |
ARCSTAT_BUMP(arcstat_l2_io_error); |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4335 |
} else { |
13980
d7059eb1884c
3598 want to dtrace when errors are generated in zfs
Matthew Ahrens <mahrens@delphix.com>
parents:
13973
diff
changeset
|
4336 |
zio->io_error = SET_ERROR(EIO); |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4337 |
} |
5450 | 4338 |
if (!equal) |
4339 |
ARCSTAT_BUMP(arcstat_l2_cksum_bad); |
|
4340 |
||
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4341 |
/* |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4342 |
* If there's no waiter, issue an async i/o to the primary |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4343 |
* storage now. If there *is* a waiter, the caller must |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4344 |
* issue the i/o in a context where it's OK to block. |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4345 |
*/ |
8632
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
4346 |
if (zio->io_waiter == NULL) { |
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
4347 |
zio_t *pio = zio_unique_parent(zio); |
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
4348 |
|
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
4349 |
ASSERT(!pio || pio->io_child_type == ZIO_CHILD_LOGICAL); |
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
4350 |
|
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
4351 |
zio_nowait(zio_read(pio, cb->l2rcb_spa, &cb->l2rcb_bp, |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4352 |
buf->b_data, zio->io_size, arc_read_done, buf, |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4353 |
zio->io_priority, cb->l2rcb_flags, &cb->l2rcb_zb)); |
8632
36ef517870a3
6798384 It can take a village to raise a zio
Bill Moore <Bill.Moore@Sun.COM>
parents:
8628
diff
changeset
|
4354 |
} |
5450 | 4355 |
} |
4356 |
||
4357 |
kmem_free(cb, sizeof (l2arc_read_callback_t)); |
|
4358 |
} |
|
4359 |
||
4360 |
/* |
|
4361 |
* This is the list priority from which the L2ARC will search for pages to |
|
4362 |
* cache. This is used within loops (0..3) to cycle through lists in the |
|
4363 |
* desired order. This order can have a significant effect on cache |
|
4364 |
* performance. |
|
4365 |
* |
|
4366 |
* Currently the metadata lists are hit first, MFU then MRU, followed by |
|
4367 |
* the data lists. This function returns a locked list, and also returns |
|
4368 |
* the lock pointer. |
|
4369 |
*/ |
|
4370 |
static list_t * |
|
4371 |
l2arc_list_locked(int list_num, kmutex_t **lock) |
|
4372 |
{ |
|
13952
7a22d0770fc8
3522 zfs module should not allow uninitialized variables
George Wilson <george.wilson@delphix.com>
parents:
13941
diff
changeset
|
4373 |
list_t *list = NULL; |
5450 | 4374 |
|
4375 |
ASSERT(list_num >= 0 && list_num <= 3); |
|
4376 |
||
4377 |
switch (list_num) { |
|
4378 |
case 0: |
|
4379 |
list = &arc_mfu->arcs_list[ARC_BUFC_METADATA]; |
|
4380 |
*lock = &arc_mfu->arcs_mtx; |
|
4381 |
break; |
|
4382 |
case 1: |
|
4383 |
list = &arc_mru->arcs_list[ARC_BUFC_METADATA]; |
|
4384 |
*lock = &arc_mru->arcs_mtx; |
|
4385 |
break; |
|
4386 |
case 2: |
|
4387 |
list = &arc_mfu->arcs_list[ARC_BUFC_DATA]; |
|
4388 |
*lock = &arc_mfu->arcs_mtx; |
|
4389 |
break; |
|
4390 |
case 3: |
|
4391 |
list = &arc_mru->arcs_list[ARC_BUFC_DATA]; |
|
4392 |
*lock = &arc_mru->arcs_mtx; |
|
4393 |
break; |
|
4394 |
} |
|
4395 |
||
4396 |
ASSERT(!(MUTEX_HELD(*lock))); |
|
4397 |
mutex_enter(*lock); |
|
4398 |
return (list); |
|
4399 |
} |
|
4400 |
||
4401 |
/* |
|
4402 |
* Evict buffers from the device write hand to the distance specified in |
|
4403 |
* bytes. This distance may span populated buffers, it may span nothing. |
|
4404 |
* This is clearing a region on the L2ARC device ready for writing. |
|
4405 |
* If the 'all' boolean is set, every buffer is evicted. |
|
4406 |
*/ |
|
4407 |
static void |
|
4408 |
l2arc_evict(l2arc_dev_t *dev, uint64_t distance, boolean_t all) |
|
4409 |
{ |
|
4410 |
list_t *buflist; |
|
4411 |
l2arc_buf_hdr_t *abl2; |
|
4412 |
arc_buf_hdr_t *ab, *ab_prev; |
|
4413 |
kmutex_t *hash_lock; |
|
4414 |
uint64_t taddr; |
|
4415 |
||
4416 |
buflist = dev->l2ad_buflist; |
|
4417 |
||
4418 |
if (buflist == NULL) |
|
4419 |
return; |
|
4420 |
||
4421 |
if (!all && dev->l2ad_first) { |
|
4422 |
/* |
|
4423 |
* This is the first sweep through the device. There is |
|
4424 |
* nothing to evict. |
|
4425 |
*/ |
|
4426 |
return; |
|
4427 |
} |
|
4428 |
||
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4429 |
if (dev->l2ad_hand >= (dev->l2ad_end - (2 * distance))) { |
5450 | 4430 |
/* |
4431 |
* When nearing the end of the device, evict to the end |
|
4432 |
* before the device write hand jumps to the start. |
|
4433 |
*/ |
|
4434 |
taddr = dev->l2ad_end; |
|
4435 |
} else { |
|
4436 |
taddr = dev->l2ad_hand + distance; |
|
4437 |
} |
|
4438 |
DTRACE_PROBE4(l2arc__evict, l2arc_dev_t *, dev, list_t *, buflist, |
|
4439 |
uint64_t, taddr, boolean_t, all); |
|
4440 |
||
4441 |
top: |
|
4442 |
mutex_enter(&l2arc_buflist_mtx); |
|
4443 |
for (ab = list_tail(buflist); ab; ab = ab_prev) { |
|
4444 |
ab_prev = list_prev(buflist, ab); |
|
4445 |
||
4446 |
hash_lock = HDR_LOCK(ab); |
|
4447 |
if (!mutex_tryenter(hash_lock)) { |
|
4448 |
/* |
|
4449 |
* Missed the hash lock. Retry. |
|
4450 |
*/ |
|
4451 |
ARCSTAT_BUMP(arcstat_l2_evict_lock_retry); |
|
4452 |
mutex_exit(&l2arc_buflist_mtx); |
|
4453 |
mutex_enter(hash_lock); |
|
4454 |
mutex_exit(hash_lock); |
|
4455 |
goto top; |
|
4456 |
} |
|
4457 |
||
4458 |
if (HDR_L2_WRITE_HEAD(ab)) { |
|
4459 |
/* |
|
4460 |
* We hit a write head node. Leave it for |
|
4461 |
* l2arc_write_done(). |
|
4462 |
*/ |
|
4463 |
list_remove(buflist, ab); |
|
4464 |
mutex_exit(hash_lock); |
|
4465 |
continue; |
|
4466 |
} |
|
4467 |
||
4468 |
if (!all && ab->b_l2hdr != NULL && |
|
4469 |
(ab->b_l2hdr->b_daddr > taddr || |
|
4470 |
ab->b_l2hdr->b_daddr < dev->l2ad_hand)) { |
|
4471 |
/* |
|
4472 |
* We've evicted to the target address, |
|
4473 |
* or the end of the device. |
|
4474 |
*/ |
|
4475 |
mutex_exit(hash_lock); |
|
4476 |
break; |
|
4477 |
} |
|
4478 |
||
4479 |
if (HDR_FREE_IN_PROGRESS(ab)) { |
|
4480 |
/* |
|
4481 |
* Already on the path to destruction. |
|
4482 |
*/ |
|
4483 |
mutex_exit(hash_lock); |
|
4484 |
continue; |
|
4485 |
} |
|
4486 |
||
4487 |
if (ab->b_state == arc_l2c_only) { |
|
4488 |
ASSERT(!HDR_L2_READING(ab)); |
|
4489 |
/* |
|
4490 |
* This doesn't exist in the ARC. Destroy. |
|
4491 |
* arc_hdr_destroy() will call list_remove() |
|
4492 |
* and decrement arcstat_l2_size. |
|
4493 |
*/ |
|
4494 |
arc_change_state(arc_anon, ab, hash_lock); |
|
4495 |
arc_hdr_destroy(ab); |
|
4496 |
} else { |
|
4497 |
/* |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4498 |
* Invalidate issued or about to be issued |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4499 |
* reads, since we may be about to write |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4500 |
* over this location. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4501 |
*/ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4502 |
if (HDR_L2_READING(ab)) { |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4503 |
ARCSTAT_BUMP(arcstat_l2_evict_reading); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4504 |
ab->b_flags |= ARC_L2_EVICTED; |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4505 |
} |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4506 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4507 |
/* |
5450 | 4508 |
* Tell ARC this no longer exists in L2ARC. |
4509 |
*/ |
|
4510 |
if (ab->b_l2hdr != NULL) { |
|
4511 |
abl2 = ab->b_l2hdr; |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4512 |
ARCSTAT_INCR(arcstat_l2_asize, -abl2->b_asize); |
5450 | 4513 |
ab->b_l2hdr = NULL; |
4514 |
kmem_free(abl2, sizeof (l2arc_buf_hdr_t)); |
|
4515 |
ARCSTAT_INCR(arcstat_l2_size, -ab->b_size); |
|
4516 |
} |
|
4517 |
list_remove(buflist, ab); |
|
4518 |
||
4519 |
/* |
|
4520 |
* This may have been leftover after a |
|
4521 |
* failed write. |
|
4522 |
*/ |
|
4523 |
ab->b_flags &= ~ARC_L2_WRITING; |
|
4524 |
} |
|
4525 |
mutex_exit(hash_lock); |
|
4526 |
} |
|
4527 |
mutex_exit(&l2arc_buflist_mtx); |
|
4528 |
||
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
4529 |
vdev_space_update(dev->l2ad_vdev, -(taddr - dev->l2ad_evict), 0, 0); |
5450 | 4530 |
dev->l2ad_evict = taddr; |
4531 |
} |
|
4532 |
||
4533 |
/* |
|
4534 |
* Find and write ARC buffers to the L2ARC device. |
|
4535 |
* |
|
4536 |
* An ARC_L2_WRITING flag is set so that the L2ARC buffers are not valid |
|
4537 |
* for reading until they have completed writing. |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4538 |
* The headroom_boost is an in-out parameter used to maintain headroom boost |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4539 |
* state between calls to this function. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4540 |
* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4541 |
* Returns the number of bytes actually written (which may be smaller than |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4542 |
* the delta by which the device hand has changed due to alignment). |
5450 | 4543 |
*/ |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4544 |
static uint64_t |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4545 |
l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4546 |
boolean_t *headroom_boost) |
5450 | 4547 |
{ |
4548 |
arc_buf_hdr_t *ab, *ab_prev, *head; |
|
4549 |
list_t *list; |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4550 |
uint64_t write_asize, write_psize, write_sz, headroom, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4551 |
buf_compress_minsz; |
5450 | 4552 |
void *buf_data; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4553 |
kmutex_t *list_lock; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4554 |
boolean_t full; |
5450 | 4555 |
l2arc_write_callback_t *cb; |
4556 |
zio_t *pio, *wzio; |
|
13514
417c34452f03
1748 desire support for reguid in zfs
Garrett D'Amore <garrett@nexenta.com>
parents:
13061
diff
changeset
|
4557 |
uint64_t guid = spa_load_guid(spa); |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4558 |
const boolean_t do_headroom_boost = *headroom_boost; |
5450 | 4559 |
|
4560 |
ASSERT(dev->l2ad_vdev != NULL); |
|
4561 |
||
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4562 |
/* Lower the flag now, we might want to raise it again later. */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4563 |
*headroom_boost = B_FALSE; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4564 |
|
5450 | 4565 |
pio = NULL; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4566 |
write_sz = write_asize = write_psize = 0; |
5450 | 4567 |
full = B_FALSE; |
6245
1a2a7cfb9f26
6429205 each zpool needs to monitor its throughput and throttle heavy writers
maybee
parents:
6018
diff
changeset
|
4568 |
head = kmem_cache_alloc(hdr_cache, KM_PUSHPAGE); |
5450 | 4569 |
head->b_flags |= ARC_L2_WRITE_HEAD; |
4570 |
||
4571 |
/* |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4572 |
* We will want to try to compress buffers that are at least 2x the |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4573 |
* device sector size. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4574 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4575 |
buf_compress_minsz = 2 << dev->l2ad_vdev->vdev_ashift; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4576 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4577 |
/* |
5450 | 4578 |
* Copy buffers for L2ARC writing. |
4579 |
*/ |
|
4580 |
mutex_enter(&l2arc_buflist_mtx); |
|
4581 |
for (int try = 0; try <= 3; try++) { |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4582 |
uint64_t passed_sz = 0; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4583 |
|
5450 | 4584 |
list = l2arc_list_locked(try, &list_lock); |
4585 |
||
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4586 |
/* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4587 |
* L2ARC fast warmup. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4588 |
* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4589 |
* Until the ARC is warm and starts to evict, read from the |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4590 |
* head of the ARC lists rather than the tail. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4591 |
*/ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4592 |
if (arc_warm == B_FALSE) |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4593 |
ab = list_head(list); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4594 |
else |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4595 |
ab = list_tail(list); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4596 |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4597 |
headroom = target_sz * l2arc_headroom; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4598 |
if (do_headroom_boost) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4599 |
headroom = (headroom * l2arc_headroom_boost) / 100; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4600 |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4601 |
for (; ab; ab = ab_prev) { |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4602 |
l2arc_buf_hdr_t *l2hdr; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4603 |
kmutex_t *hash_lock; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4604 |
uint64_t buf_sz; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4605 |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4606 |
if (arc_warm == B_FALSE) |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4607 |
ab_prev = list_next(list, ab); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4608 |
else |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4609 |
ab_prev = list_prev(list, ab); |
5450 | 4610 |
|
4611 |
hash_lock = HDR_LOCK(ab); |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4612 |
if (!mutex_tryenter(hash_lock)) { |
5450 | 4613 |
/* |
4614 |
* Skip this buffer rather than waiting. |
|
4615 |
*/ |
|
4616 |
continue; |
|
4617 |
} |
|
4618 |
||
4619 |
passed_sz += ab->b_size; |
|
4620 |
if (passed_sz > headroom) { |
|
4621 |
/* |
|
4622 |
* Searched too far. |
|
4623 |
*/ |
|
4624 |
mutex_exit(hash_lock); |
|
4625 |
break; |
|
4626 |
} |
|
4627 |
||
8636
7e4ce9158df3
6551866 deadlock between zfs_write(), zfs_freesp(), and zfs_putapage()
Mark Maybee <Mark.Maybee@Sun.COM>
parents:
8632
diff
changeset
|
4628 |
if (!l2arc_write_eligible(guid, ab)) { |
5450 | 4629 |
mutex_exit(hash_lock); |
4630 |
continue; |
|
4631 |
} |
|
4632 |
||
4633 |
if ((write_sz + ab->b_size) > target_sz) { |
|
4634 |
full = B_TRUE; |
|
4635 |
mutex_exit(hash_lock); |
|
4636 |
break; |
|
4637 |
} |
|
4638 |
||
4639 |
if (pio == NULL) { |
|
4640 |
/* |
|
4641 |
* Insert a dummy header on the buflist so |
|
4642 |
* l2arc_write_done() can find where the |
|
4643 |
* write buffers begin without searching. |
|
4644 |
*/ |
|
4645 |
list_insert_head(dev->l2ad_buflist, head); |
|
4646 |
||
4647 |
cb = kmem_alloc( |
|
4648 |
sizeof (l2arc_write_callback_t), KM_SLEEP); |
|
4649 |
cb->l2wcb_dev = dev; |
|
4650 |
cb->l2wcb_head = head; |
|
4651 |
pio = zio_root(spa, l2arc_write_done, cb, |
|
4652 |
ZIO_FLAG_CANFAIL); |
|
4653 |
} |
|
4654 |
||
4655 |
/* |
|
4656 |
* Create and add a new L2ARC header. |
|
4657 |
*/ |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4658 |
l2hdr = kmem_zalloc(sizeof (l2arc_buf_hdr_t), KM_SLEEP); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4659 |
l2hdr->b_dev = dev; |
5450 | 4660 |
ab->b_flags |= ARC_L2_WRITING; |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4661 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4662 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4663 |
* Temporarily stash the data buffer in b_tmp_cdata. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4664 |
* The subsequent write step will pick it up from |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4665 |
* there. This is because can't access ab->b_buf |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4666 |
* without holding the hash_lock, which we in turn |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4667 |
* can't access without holding the ARC list locks |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4668 |
* (which we want to avoid during compression/writing). |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4669 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4670 |
l2hdr->b_compress = ZIO_COMPRESS_OFF; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4671 |
l2hdr->b_asize = ab->b_size; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4672 |
l2hdr->b_tmp_cdata = ab->b_buf->b_data; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4673 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4674 |
buf_sz = ab->b_size; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4675 |
ab->b_l2hdr = l2hdr; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4676 |
|
5450 | 4677 |
list_insert_head(dev->l2ad_buflist, ab); |
4678 |
||
4679 |
/* |
|
4680 |
* Compute and store the buffer cksum before |
|
4681 |
* writing. On debug the cksum is verified first. |
|
4682 |
*/ |
|
4683 |
arc_cksum_verify(ab->b_buf); |
|
4684 |
arc_cksum_compute(ab->b_buf, B_TRUE); |
|
4685 |
||
4686 |
mutex_exit(hash_lock); |
|
4687 |
||
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4688 |
write_sz += buf_sz; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4689 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4690 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4691 |
mutex_exit(list_lock); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4692 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4693 |
if (full == B_TRUE) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4694 |
break; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4695 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4696 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4697 |
/* No buffers selected for writing? */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4698 |
if (pio == NULL) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4699 |
ASSERT0(write_sz); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4700 |
mutex_exit(&l2arc_buflist_mtx); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4701 |
kmem_cache_free(hdr_cache, head); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4702 |
return (0); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4703 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4704 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4705 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4706 |
* Now start writing the buffers. We're starting at the write head |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4707 |
* and work backwards, retracing the course of the buffer selector |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4708 |
* loop above. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4709 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4710 |
for (ab = list_prev(dev->l2ad_buflist, head); ab; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4711 |
ab = list_prev(dev->l2ad_buflist, ab)) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4712 |
l2arc_buf_hdr_t *l2hdr; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4713 |
uint64_t buf_sz; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4714 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4715 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4716 |
* We shouldn't need to lock the buffer here, since we flagged |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4717 |
* it as ARC_L2_WRITING in the previous step, but we must take |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4718 |
* care to only access its L2 cache parameters. In particular, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4719 |
* ab->b_buf may be invalid by now due to ARC eviction. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4720 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4721 |
l2hdr = ab->b_l2hdr; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4722 |
l2hdr->b_daddr = dev->l2ad_hand; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4723 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4724 |
if ((ab->b_flags & ARC_L2COMPRESS) && |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4725 |
l2hdr->b_asize >= buf_compress_minsz) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4726 |
if (l2arc_compress_buf(l2hdr)) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4727 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4728 |
* If compression succeeded, enable headroom |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4729 |
* boost on the next scan cycle. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4730 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4731 |
*headroom_boost = B_TRUE; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4732 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4733 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4734 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4735 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4736 |
* Pick up the buffer data we had previously stashed away |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4737 |
* (and now potentially also compressed). |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4738 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4739 |
buf_data = l2hdr->b_tmp_cdata; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4740 |
buf_sz = l2hdr->b_asize; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4741 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4742 |
/* Compression may have squashed the buffer to zero length. */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4743 |
if (buf_sz != 0) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4744 |
uint64_t buf_p_sz; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4745 |
|
5450 | 4746 |
wzio = zio_write_phys(pio, dev->l2ad_vdev, |
4747 |
dev->l2ad_hand, buf_sz, buf_data, ZIO_CHECKSUM_OFF, |
|
4748 |
NULL, NULL, ZIO_PRIORITY_ASYNC_WRITE, |
|
4749 |
ZIO_FLAG_CANFAIL, B_FALSE); |
|
4750 |
||
4751 |
DTRACE_PROBE2(l2arc__write, vdev_t *, dev->l2ad_vdev, |
|
4752 |
zio_t *, wzio); |
|
4753 |
(void) zio_nowait(wzio); |
|
4754 |
||
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4755 |
write_asize += buf_sz; |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4756 |
/* |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4757 |
* Keep the clock hand suitably device-aligned. |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
4758 |
*/ |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4759 |
buf_p_sz = vdev_psize_to_asize(dev->l2ad_vdev, buf_sz); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4760 |
write_psize += buf_p_sz; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4761 |
dev->l2ad_hand += buf_p_sz; |
5450 | 4762 |
} |
4763 |
} |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4764 |
|
5450 | 4765 |
mutex_exit(&l2arc_buflist_mtx); |
4766 |
||
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4767 |
ASSERT3U(write_asize, <=, target_sz); |
5450 | 4768 |
ARCSTAT_BUMP(arcstat_l2_writes_sent); |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4769 |
ARCSTAT_INCR(arcstat_l2_write_bytes, write_asize); |
5450 | 4770 |
ARCSTAT_INCR(arcstat_l2_size, write_sz); |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4771 |
ARCSTAT_INCR(arcstat_l2_asize, write_asize); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4772 |
vdev_space_update(dev->l2ad_vdev, write_psize, 0, 0); |
5450 | 4773 |
|
4774 |
/* |
|
4775 |
* Bump device hand to the device start if it is approaching the end. |
|
4776 |
* l2arc_evict() will already have evicted ahead for this case. |
|
4777 |
*/ |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4778 |
if (dev->l2ad_hand >= (dev->l2ad_end - target_sz)) { |
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
4779 |
vdev_space_update(dev->l2ad_vdev, |
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
4780 |
dev->l2ad_end - dev->l2ad_hand, 0, 0); |
5450 | 4781 |
dev->l2ad_hand = dev->l2ad_start; |
4782 |
dev->l2ad_evict = dev->l2ad_start; |
|
4783 |
dev->l2ad_first = B_FALSE; |
|
4784 |
} |
|
4785 |
||
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4786 |
dev->l2ad_writing = B_TRUE; |
5450 | 4787 |
(void) zio_wait(pio); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4788 |
dev->l2ad_writing = B_FALSE; |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4789 |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4790 |
return (write_asize); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4791 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4792 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4793 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4794 |
* Compresses an L2ARC buffer. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4795 |
* The data to be compressed must be prefilled in l2hdr->b_tmp_cdata and its |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4796 |
* size in l2hdr->b_asize. This routine tries to compress the data and |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4797 |
* depending on the compression result there are three possible outcomes: |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4798 |
* *) The buffer was incompressible. The original l2hdr contents were left |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4799 |
* untouched and are ready for writing to an L2 device. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4800 |
* *) The buffer was all-zeros, so there is no need to write it to an L2 |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4801 |
* device. To indicate this situation b_tmp_cdata is NULL'ed, b_asize is |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4802 |
* set to zero and b_compress is set to ZIO_COMPRESS_EMPTY. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4803 |
* *) Compression succeeded and b_tmp_cdata was replaced with a temporary |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4804 |
* data buffer which holds the compressed data to be written, and b_asize |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4805 |
* tells us how much data there is. b_compress is set to the appropriate |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4806 |
* compression algorithm. Once writing is done, invoke |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4807 |
* l2arc_release_cdata_buf on this l2hdr to free this temporary buffer. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4808 |
* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4809 |
* Returns B_TRUE if compression succeeded, or B_FALSE if it didn't (the |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4810 |
* buffer was incompressible). |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4811 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4812 |
static boolean_t |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4813 |
l2arc_compress_buf(l2arc_buf_hdr_t *l2hdr) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4814 |
{ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4815 |
void *cdata; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4816 |
size_t csize, len; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4817 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4818 |
ASSERT(l2hdr->b_compress == ZIO_COMPRESS_OFF); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4819 |
ASSERT(l2hdr->b_tmp_cdata != NULL); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4820 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4821 |
len = l2hdr->b_asize; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4822 |
cdata = zio_data_buf_alloc(len); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4823 |
csize = zio_compress_data(ZIO_COMPRESS_LZ4, l2hdr->b_tmp_cdata, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4824 |
cdata, l2hdr->b_asize); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4825 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4826 |
if (csize == 0) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4827 |
/* zero block, indicate that there's nothing to write */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4828 |
zio_data_buf_free(cdata, len); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4829 |
l2hdr->b_compress = ZIO_COMPRESS_EMPTY; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4830 |
l2hdr->b_asize = 0; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4831 |
l2hdr->b_tmp_cdata = NULL; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4832 |
ARCSTAT_BUMP(arcstat_l2_compress_zeros); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4833 |
return (B_TRUE); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4834 |
} else if (csize > 0 && csize < len) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4835 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4836 |
* Compression succeeded, we'll keep the cdata around for |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4837 |
* writing and release it afterwards. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4838 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4839 |
l2hdr->b_compress = ZIO_COMPRESS_LZ4; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4840 |
l2hdr->b_asize = csize; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4841 |
l2hdr->b_tmp_cdata = cdata; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4842 |
ARCSTAT_BUMP(arcstat_l2_compress_successes); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4843 |
return (B_TRUE); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4844 |
} else { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4845 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4846 |
* Compression failed, release the compressed buffer. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4847 |
* l2hdr will be left unmodified. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4848 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4849 |
zio_data_buf_free(cdata, len); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4850 |
ARCSTAT_BUMP(arcstat_l2_compress_failures); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4851 |
return (B_FALSE); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4852 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4853 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4854 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4855 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4856 |
* Decompresses a zio read back from an l2arc device. On success, the |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4857 |
* underlying zio's io_data buffer is overwritten by the uncompressed |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4858 |
* version. On decompression error (corrupt compressed stream), the |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4859 |
* zio->io_error value is set to signal an I/O error. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4860 |
* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4861 |
* Please note that the compressed data stream is not checksummed, so |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4862 |
* if the underlying device is experiencing data corruption, we may feed |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4863 |
* corrupt data to the decompressor, so the decompressor needs to be |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4864 |
* able to handle this situation (LZ4 does). |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4865 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4866 |
static void |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4867 |
l2arc_decompress_zio(zio_t *zio, arc_buf_hdr_t *hdr, enum zio_compress c) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4868 |
{ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4869 |
ASSERT(L2ARC_IS_VALID_COMPRESS(c)); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4870 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4871 |
if (zio->io_error != 0) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4872 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4873 |
* An io error has occured, just restore the original io |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4874 |
* size in preparation for a main pool read. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4875 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4876 |
zio->io_orig_size = zio->io_size = hdr->b_size; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4877 |
return; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4878 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4879 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4880 |
if (c == ZIO_COMPRESS_EMPTY) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4881 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4882 |
* An empty buffer results in a null zio, which means we |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4883 |
* need to fill its io_data after we're done restoring the |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4884 |
* buffer's contents. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4885 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4886 |
ASSERT(hdr->b_buf != NULL); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4887 |
bzero(hdr->b_buf->b_data, hdr->b_size); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4888 |
zio->io_data = zio->io_orig_data = hdr->b_buf->b_data; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4889 |
} else { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4890 |
ASSERT(zio->io_data != NULL); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4891 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4892 |
* We copy the compressed data from the start of the arc buffer |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4893 |
* (the zio_read will have pulled in only what we need, the |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4894 |
* rest is garbage which we will overwrite at decompression) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4895 |
* and then decompress back to the ARC data buffer. This way we |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4896 |
* can minimize copying by simply decompressing back over the |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4897 |
* original compressed data (rather than decompressing to an |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4898 |
* aux buffer and then copying back the uncompressed buffer, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4899 |
* which is likely to be much larger). |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4900 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4901 |
uint64_t csize; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4902 |
void *cdata; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4903 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4904 |
csize = zio->io_size; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4905 |
cdata = zio_data_buf_alloc(csize); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4906 |
bcopy(zio->io_data, cdata, csize); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4907 |
if (zio_decompress_data(c, cdata, zio->io_data, csize, |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4908 |
hdr->b_size) != 0) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4909 |
zio->io_error = EIO; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4910 |
zio_data_buf_free(cdata, csize); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4911 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4912 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4913 |
/* Restore the expected uncompressed IO size. */ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4914 |
zio->io_orig_size = zio->io_size = hdr->b_size; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4915 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4916 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4917 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4918 |
* Releases the temporary b_tmp_cdata buffer in an l2arc header structure. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4919 |
* This buffer serves as a temporary holder of compressed data while |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4920 |
* the buffer entry is being written to an l2arc device. Once that is |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4921 |
* done, we can dispose of it. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4922 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4923 |
static void |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4924 |
l2arc_release_cdata_buf(arc_buf_hdr_t *ab) |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4925 |
{ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4926 |
l2arc_buf_hdr_t *l2hdr = ab->b_l2hdr; |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4927 |
|
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4928 |
if (l2hdr->b_compress == ZIO_COMPRESS_LZ4) { |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4929 |
/* |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4930 |
* If the data was compressed, then we've allocated a |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4931 |
* temporary buffer for it, so now we need to release it. |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4932 |
*/ |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4933 |
ASSERT(l2hdr->b_tmp_cdata != NULL); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4934 |
zio_data_buf_free(l2hdr->b_tmp_cdata, ab->b_size); |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4935 |
} |
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4936 |
l2hdr->b_tmp_cdata = NULL; |
5450 | 4937 |
} |
4938 |
||
4939 |
/* |
|
4940 |
* This thread feeds the L2ARC at regular intervals. This is the beating |
|
4941 |
* heart of the L2ARC. |
|
4942 |
*/ |
|
4943 |
static void |
|
4944 |
l2arc_feed_thread(void) |
|
4945 |
{ |
|
4946 |
callb_cpr_t cpr; |
|
4947 |
l2arc_dev_t *dev; |
|
4948 |
spa_t *spa; |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4949 |
uint64_t size, wrote; |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
4950 |
clock_t begin, next = ddi_get_lbolt(); |
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
4951 |
boolean_t headroom_boost = B_FALSE; |
5450 | 4952 |
|
4953 |
CALLB_CPR_INIT(&cpr, &l2arc_feed_thr_lock, callb_generic_cpr, FTAG); |
|
4954 |
||
4955 |
mutex_enter(&l2arc_feed_thr_lock); |
|
4956 |
||
4957 |
while (l2arc_thread_exit == 0) { |
|
4958 |
CALLB_CPR_SAFE_BEGIN(&cpr); |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4959 |
(void) cv_timedwait(&l2arc_feed_thr_cv, &l2arc_feed_thr_lock, |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
4960 |
next); |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4961 |
CALLB_CPR_SAFE_END(&cpr, &l2arc_feed_thr_lock); |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
4962 |
next = ddi_get_lbolt() + hz; |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4963 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4964 |
/* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4965 |
* Quick check for L2ARC devices. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4966 |
*/ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4967 |
mutex_enter(&l2arc_dev_mtx); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4968 |
if (l2arc_ndev == 0) { |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4969 |
mutex_exit(&l2arc_dev_mtx); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4970 |
continue; |
5450 | 4971 |
} |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4972 |
mutex_exit(&l2arc_dev_mtx); |
11066
cebb50cbe4f9
PSARC/2009/396 Tickless Kernel Architecture / lbolt decoupling
Rafael Vanoni <rafael.vanoni@sun.com>
parents:
10922
diff
changeset
|
4973 |
begin = ddi_get_lbolt(); |
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4974 |
|
5450 | 4975 |
/* |
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4976 |
* This selects the next l2arc device to write to, and in |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
4977 |
* doing so the next spa to feed from: dev->l2ad_spa. This |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4978 |
* will return NULL if there are now no l2arc devices or if |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4979 |
* they are all faulted. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4980 |
* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4981 |
* If a device is returned, its spa's config lock is also |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4982 |
* held to prevent device removal. l2arc_dev_get_next() |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4983 |
* will grab and release l2arc_dev_mtx. |
5450 | 4984 |
*/ |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4985 |
if ((dev = l2arc_dev_get_next()) == NULL) |
5450 | 4986 |
continue; |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4987 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4988 |
spa = dev->l2ad_spa; |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
4989 |
ASSERT(spa != NULL); |
5450 | 4990 |
|
4991 |
/* |
|
13061
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4992 |
* If the pool is read-only then force the feed thread to |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4993 |
* sleep a little longer. |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4994 |
*/ |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4995 |
if (!spa_writeable(spa)) { |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4996 |
next = ddi_get_lbolt() + 5 * l2arc_feed_secs * hz; |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4997 |
spa_config_exit(spa, SCL_L2ARC, dev); |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4998 |
continue; |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
4999 |
} |
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
5000 |
|
bda0decf867b
PSARC 2010/306 Read-only ZFS pools
George Wilson <George.Wilson@Sun.COM>
parents:
12674
diff
changeset
|
5001 |
/* |
5450 | 5002 |
* Avoid contributing to memory pressure. |
5003 |
*/ |
|
5004 |
if (arc_reclaim_needed()) { |
|
5005 |
ARCSTAT_BUMP(arcstat_l2_abort_lowmem); |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5006 |
spa_config_exit(spa, SCL_L2ARC, dev); |
5450 | 5007 |
continue; |
5008 |
} |
|
5009 |
||
5010 |
ARCSTAT_BUMP(arcstat_l2_feeds); |
|
5011 |
||
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
5012 |
size = l2arc_write_size(); |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5013 |
|
5450 | 5014 |
/* |
5015 |
* Evict L2ARC buffers that will be overwritten. |
|
5016 |
*/ |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5017 |
l2arc_evict(dev, size, B_FALSE); |
5450 | 5018 |
|
5019 |
/* |
|
5020 |
* Write ARC buffers. |
|
5021 |
*/ |
|
14039
6cfd5a5778b9
3137 L2ARC compression
Saso Kiselkov <skiselkov@gmail.com>
parents:
13980
diff
changeset
|
5022 |
wrote = l2arc_write_buffers(spa, dev, size, &headroom_boost); |
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
5023 |
|
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
5024 |
/* |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
5025 |
* Calculate interval between writes. |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
5026 |
*/ |
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
5027 |
next = l2arc_write_interval(begin, size, wrote); |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5028 |
spa_config_exit(spa, SCL_L2ARC, dev); |
5450 | 5029 |
} |
5030 |
||
5031 |
l2arc_thread_exit = 0; |
|
5032 |
cv_broadcast(&l2arc_feed_thr_cv); |
|
5033 |
CALLB_CPR_EXIT(&cpr); /* drops l2arc_feed_thr_lock */ |
|
5034 |
thread_exit(); |
|
5035 |
} |
|
5036 |
||
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5037 |
boolean_t |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5038 |
l2arc_vdev_present(vdev_t *vd) |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5039 |
{ |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5040 |
l2arc_dev_t *dev; |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5041 |
|
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5042 |
mutex_enter(&l2arc_dev_mtx); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5043 |
for (dev = list_head(l2arc_dev_list); dev != NULL; |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5044 |
dev = list_next(l2arc_dev_list, dev)) { |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5045 |
if (dev->l2ad_vdev == vd) |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5046 |
break; |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5047 |
} |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5048 |
mutex_exit(&l2arc_dev_mtx); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5049 |
|
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5050 |
return (dev != NULL); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5051 |
} |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5052 |
|
5450 | 5053 |
/* |
5054 |
* Add a vdev for use by the L2ARC. By this point the spa has already |
|
5055 |
* validated the vdev and opened it. |
|
5056 |
*/ |
|
5057 |
void |
|
9816
847676ec1c5b
PSARC 2008/353 zpool autoexpand property
George Wilson <George.Wilson@Sun.COM>
parents:
9412
diff
changeset
|
5058 |
l2arc_add_vdev(spa_t *spa, vdev_t *vd) |
5450 | 5059 |
{ |
5060 |
l2arc_dev_t *adddev; |
|
5061 |
||
6643
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5062 |
ASSERT(!l2arc_vdev_present(vd)); |
3a34b0dbb107
6625086 changing cachefile doesn't remove old cache on last user
eschrock
parents:
6245
diff
changeset
|
5063 |
|
5450 | 5064 |
/* |
5065 |
* Create a new l2arc device entry. |
|
5066 |
*/ |
|
5067 |
adddev = kmem_zalloc(sizeof (l2arc_dev_t), KM_SLEEP); |
|
5068 |
adddev->l2ad_spa = spa; |
|
5069 |
adddev->l2ad_vdev = vd; |
|
9816
847676ec1c5b
PSARC 2008/353 zpool autoexpand property
George Wilson <George.Wilson@Sun.COM>
parents:
9412
diff
changeset
|
5070 |
adddev->l2ad_start = VDEV_LABEL_START_SIZE; |
847676ec1c5b
PSARC 2008/353 zpool autoexpand property
George Wilson <George.Wilson@Sun.COM>
parents:
9412
diff
changeset
|
5071 |
adddev->l2ad_end = VDEV_LABEL_START_SIZE + vdev_get_min_asize(vd); |
5450 | 5072 |
adddev->l2ad_hand = adddev->l2ad_start; |
5073 |
adddev->l2ad_evict = adddev->l2ad_start; |
|
5074 |
adddev->l2ad_first = B_TRUE; |
|
8582
df9361868dbe
6748019 ARC/L2ARC metadata accounting for arc_size
Brendan Gregg - Sun Microsystems <Brendan.Gregg@Sun.COM>
parents:
8241
diff
changeset
|
5075 |
adddev->l2ad_writing = B_FALSE; |
5450 | 5076 |
|
5077 |
/* |
|
5078 |
* This is a list of all ARC buffers that are still valid on the |
|
5079 |
* device. |
|
5080 |
*/ |
|
5081 |
adddev->l2ad_buflist = kmem_zalloc(sizeof (list_t), KM_SLEEP); |
|
5082 |
list_create(adddev->l2ad_buflist, sizeof (arc_buf_hdr_t), |
|
5083 |
offsetof(arc_buf_hdr_t, b_l2node)); |
|
5084 |
||
10922
e2081f502306
PSARC 2009/571 ZFS Deduplication Properties
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
10839
diff
changeset
|
5085 |
vdev_space_update(vd, 0, 0, adddev->l2ad_end - adddev->l2ad_hand); |
5450 | 5086 |
|
5087 |
/* |
|
5088 |
* Add device to global list |
|
5089 |
*/ |
|
5090 |
mutex_enter(&l2arc_dev_mtx); |
|
5091 |
list_insert_head(l2arc_dev_list, adddev); |
|
5092 |
atomic_inc_64(&l2arc_ndev); |
|
5093 |
mutex_exit(&l2arc_dev_mtx); |
|
5094 |
} |
|
5095 |
||
5096 |
/* |
|
5097 |
* Remove a vdev from the L2ARC. |
|
5098 |
*/ |
|
5099 |
void |
|
5100 |
l2arc_remove_vdev(vdev_t *vd) |
|
5101 |
{ |
|
5102 |
l2arc_dev_t *dev, *nextdev, *remdev = NULL; |
|
5103 |
||
5104 |
/* |
|
5105 |
* Find the device by vdev |
|
5106 |
*/ |
|
5107 |
mutex_enter(&l2arc_dev_mtx); |
|
5108 |
for (dev = list_head(l2arc_dev_list); dev; dev = nextdev) { |
|
5109 |
nextdev = list_next(l2arc_dev_list, dev); |
|
5110 |
if (vd == dev->l2ad_vdev) { |
|
5111 |
remdev = dev; |
|
5112 |
break; |
|
5113 |
} |
|
5114 |
} |
|
5115 |
ASSERT(remdev != NULL); |
|
5116 |
||
5117 |
/* |
|
5118 |
* Remove device from global list |
|
5119 |
*/ |
|
5120 |
list_remove(l2arc_dev_list, remdev); |
|
5121 |
l2arc_dev_last = NULL; /* may have been invalidated */ |
|
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5122 |
atomic_dec_64(&l2arc_ndev); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5123 |
mutex_exit(&l2arc_dev_mtx); |
5450 | 5124 |
|
5125 |
/* |
|
5126 |
* Clear all buflists and ARC references. L2ARC device flush. |
|
5127 |
*/ |
|
5128 |
l2arc_evict(remdev, 0, B_TRUE); |
|
5129 |
list_destroy(remdev->l2ad_buflist); |
|
5130 |
kmem_free(remdev->l2ad_buflist, sizeof (list_t)); |
|
5131 |
kmem_free(remdev, sizeof (l2arc_dev_t)); |
|
5132 |
} |
|
5133 |
||
5134 |
void |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5135 |
l2arc_init(void) |
5450 | 5136 |
{ |
5137 |
l2arc_thread_exit = 0; |
|
5138 |
l2arc_ndev = 0; |
|
5139 |
l2arc_writes_sent = 0; |
|
5140 |
l2arc_writes_done = 0; |
|
5141 |
||
5142 |
mutex_init(&l2arc_feed_thr_lock, NULL, MUTEX_DEFAULT, NULL); |
|
5143 |
cv_init(&l2arc_feed_thr_cv, NULL, CV_DEFAULT, NULL); |
|
5144 |
mutex_init(&l2arc_dev_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
5145 |
mutex_init(&l2arc_buflist_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
5146 |
mutex_init(&l2arc_free_on_write_mtx, NULL, MUTEX_DEFAULT, NULL); |
|
5147 |
||
5148 |
l2arc_dev_list = &L2ARC_dev_list; |
|
5149 |
l2arc_free_on_write = &L2ARC_free_on_write; |
|
5150 |
list_create(l2arc_dev_list, sizeof (l2arc_dev_t), |
|
5151 |
offsetof(l2arc_dev_t, l2ad_node)); |
|
5152 |
list_create(l2arc_free_on_write, sizeof (l2arc_data_free_t), |
|
5153 |
offsetof(l2arc_data_free_t, l2df_list_node)); |
|
5154 |
} |
|
5155 |
||
5156 |
void |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5157 |
l2arc_fini(void) |
5450 | 5158 |
{ |
6987
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5159 |
/* |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5160 |
* This is called from dmu_fini(), which is called from spa_fini(); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5161 |
* Because of this, we can assume that all l2arc devices have |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5162 |
* already been removed when the pools themselves were removed. |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5163 |
*/ |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5164 |
|
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5165 |
l2arc_do_free_on_write(); |
877c018eb06c
6628282 arc_stats.arcstat_l2_writes_sent.value.ui64) == (arc_stats.arcstat_l2_writes_done.value.ui64)
brendan
parents:
6643
diff
changeset
|
5166 |
|
5450 | 5167 |
mutex_destroy(&l2arc_feed_thr_lock); |
5168 |
cv_destroy(&l2arc_feed_thr_cv); |
|
5169 |
mutex_destroy(&l2arc_dev_mtx); |
|
5170 |
mutex_destroy(&l2arc_buflist_mtx); |
|
5171 |
mutex_destroy(&l2arc_free_on_write_mtx); |
|
5172 |
||
5173 |
list_destroy(l2arc_dev_list); |
|
5174 |
list_destroy(l2arc_free_on_write); |
|
5175 |
} |
|
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5176 |
|
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5177 |
void |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5178 |
l2arc_start(void) |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5179 |
{ |
8241
5a60f16123ba
6328632 zpool offline is a bit too conservative
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
8214
diff
changeset
|
5180 |
if (!(spa_mode_global & FWRITE)) |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5181 |
return; |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5182 |
|
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5183 |
(void) thread_create(NULL, 0, l2arc_feed_thread, NULL, 0, &p0, |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5184 |
TS_RUN, minclsyspri); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5185 |
} |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5186 |
|
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5187 |
void |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5188 |
l2arc_stop(void) |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5189 |
{ |
8241
5a60f16123ba
6328632 zpool offline is a bit too conservative
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
8214
diff
changeset
|
5190 |
if (!(spa_mode_global & FWRITE)) |
7754
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5191 |
return; |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5192 |
|
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5193 |
mutex_enter(&l2arc_feed_thr_lock); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5194 |
cv_signal(&l2arc_feed_thr_cv); /* kick thread out of startup */ |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5195 |
l2arc_thread_exit = 1; |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5196 |
while (l2arc_thread_exit != 0) |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5197 |
cv_wait(&l2arc_feed_thr_cv, &l2arc_feed_thr_lock); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5198 |
mutex_exit(&l2arc_feed_thr_lock); |
b80e4842ad54
6754011 SPA 3.0: lock breakup, i/o pipeline refactoring, device failure handling
Jeff Bonwick <Jeff.Bonwick@Sun.COM>
parents:
7545
diff
changeset
|
5199 |
} |