author | Shawn Walker-Salas <shawn.walker@oracle.com> |
Thu, 14 Apr 2016 12:48:37 -0700 | |
changeset 5781 | ecbdf40c0a37 |
parent 5331 | 9c955076ffe3 |
permissions | -rw-r--r-- |
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From f7d740377612142c6a08e460b5c542ebe0d758b3 Mon Sep 17 00:00:00 2001 |
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From: Austin Clements <[email protected]> |
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Date: Wed, 26 Aug 2015 13:54:26 -0400 |
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Subject: [PATCH 10/63] [release-branch.go1.5] runtime: add GODEBUG for stack |
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barriers at every frame |
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Currently enabling the debugging mode where stack barriers are |
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installed at every frame requires recompiling the runtime. However, |
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this is potentially useful for field debugging and for runtime tests, |
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so make this mode a GODEBUG. |
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Updates #12238. |
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Change-Id: I6fb128f598b19568ae723a612e099c0ed96917f5 |
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Reviewed-on: https://go-review.googlesource.com/13947 |
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Reviewed-by: Russ Cox <[email protected]> |
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Reviewed-on: https://go-review.googlesource.com/14240 |
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Reviewed-by: Austin Clements <[email protected]> |
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--- |
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src/runtime/extern.go | 3 +++ |
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src/runtime/mgc.go | 25 +++++++++++++------------ |
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src/runtime/mgcmark.go | 2 +- |
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src/runtime/runtime1.go | 6 ++++++ |
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4 files changed, 23 insertions(+), 13 deletions(-) |
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diff --git a/src/runtime/extern.go b/src/runtime/extern.go |
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index d346362..cdb66ba 100644 |
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--- a/src/runtime/extern.go |
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+++ b/src/runtime/extern.go |
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@@ -47,6 +47,9 @@ It is a comma-separated list of name=val pairs setting these named variables: |
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that allow the garbage collector to avoid repeating a stack scan during the |
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mark termination phase. |
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+ gcstackbarrierall: setting gcstackbarrierall=1 installs stack barriers |
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+ in every stack frame, rather than in exponentially-spaced frames. |
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+ |
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gcstoptheworld: setting gcstoptheworld=1 disables concurrent garbage collection, |
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making every garbage collection a stop-the-world event. Setting gcstoptheworld=2 |
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also disables concurrent sweeping after the garbage collection finishes. |
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diff --git a/src/runtime/mgc.go b/src/runtime/mgc.go |
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index f7fd4e5..82b12b6 100644 |
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--- a/src/runtime/mgc.go |
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+++ b/src/runtime/mgc.go |
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@@ -133,18 +133,7 @@ const ( |
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_RootFlushCaches = 4 |
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_RootCount = 5 |
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- // firstStackBarrierOffset is the approximate byte offset at |
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- // which to place the first stack barrier from the current SP. |
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- // This is a lower bound on how much stack will have to be |
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- // re-scanned during mark termination. Subsequent barriers are |
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- // placed at firstStackBarrierOffset * 2^n offsets. |
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- // |
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- // For debugging, this can be set to 0, which will install a |
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- // stack barrier at every frame. If you do this, you may also |
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- // have to raise _StackMin, since the stack barrier |
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- // bookkeeping will use a large amount of each stack. |
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- firstStackBarrierOffset = 1024 |
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- debugStackBarrier = false |
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+ debugStackBarrier = false |
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|
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// sweepMinHeapDistance is a lower bound on the heap distance |
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// (in bytes) reserved for concurrent sweeping between GC |
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@@ -152,6 +141,18 @@ const ( |
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sweepMinHeapDistance = 1024 * 1024 |
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) |
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|
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+// firstStackBarrierOffset is the approximate byte offset at |
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+// which to place the first stack barrier from the current SP. |
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+// This is a lower bound on how much stack will have to be |
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+// re-scanned during mark termination. Subsequent barriers are |
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+// placed at firstStackBarrierOffset * 2^n offsets. |
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+// |
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+// For debugging, this can be set to 0, which will install a |
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+// stack barrier at every frame. If you do this, you may also |
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+// have to raise _StackMin, since the stack barrier |
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+// bookkeeping will use a large amount of each stack. |
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+var firstStackBarrierOffset = 1024 |
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+ |
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// heapminimum is the minimum heap size at which to trigger GC. |
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// For small heaps, this overrides the usual GOGC*live set rule. |
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// |
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diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go |
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index 42aacb6..2e43830 100644 |
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--- a/src/runtime/mgcmark.go |
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+++ b/src/runtime/mgcmark.go |
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@@ -341,7 +341,7 @@ func scanstack(gp *g) { |
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switch gcphase { |
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case _GCscan: |
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// Install stack barriers during stack scan. |
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- barrierOffset = firstStackBarrierOffset |
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+ barrierOffset = uintptr(firstStackBarrierOffset) |
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nextBarrier = sp + barrierOffset |
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|
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if debug.gcstackbarrieroff > 0 { |
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diff --git a/src/runtime/runtime1.go b/src/runtime/runtime1.go |
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index a50e5b6..134c999 100644 |
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--- a/src/runtime/runtime1.go |
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+++ b/src/runtime/runtime1.go |
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@@ -310,6 +310,7 @@ var debug struct { |
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gcpacertrace int32 |
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gcshrinkstackoff int32 |
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gcstackbarrieroff int32 |
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+ gcstackbarrierall int32 |
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gcstoptheworld int32 |
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gctrace int32 |
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invalidptr int32 |
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@@ -327,6 +328,7 @@ var dbgvars = []dbgVar{ |
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{"gcpacertrace", &debug.gcpacertrace}, |
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{"gcshrinkstackoff", &debug.gcshrinkstackoff}, |
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{"gcstackbarrieroff", &debug.gcstackbarrieroff}, |
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+ {"gcstackbarrierall", &debug.gcstackbarrierall}, |
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{"gcstoptheworld", &debug.gcstoptheworld}, |
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{"gctrace", &debug.gctrace}, |
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{"invalidptr", &debug.invalidptr}, |
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@@ -382,6 +384,10 @@ func parsedebugvars() { |
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if islibrary || isarchive { |
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traceback_cache |= 1 |
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} |
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+ |
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+ if debug.gcstackbarrierall > 0 { |
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+ firstStackBarrierOffset = 0 |
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+ } |
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} |
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|
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// Poor mans 64-bit division. |
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-- |
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2.6.1 |
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129 |