--- APC-3.0.19/apc_main.c.ORIG	Fri Feb 13 17:16:08 2009
+++ APC-3.0.19/apc_main.c	Fri Feb 13 17:16:18 2009
@@ -378,21 +378,12 @@
     if (op_array == NULL) {
         return NULL;
     }
-    /*
-     * Basically this will cause a file only to be cached on a percentage 
-     * of the attempts.  This is to avoid cache slams when starting up a
-     * very busy server or when modifying files on a very busy live server.
-     * There is no point having many processes all trying to cache the same
-     * file at the same time.  By introducing a chance of being cached
-     * we theoretically cut the cache slam problem by the given percentage.
-     * For example if apc.slam_defense is set to 66 then 2/3 of the attempts
-     * to cache an uncached file will be ignored.
-     */
-    if(APCG(slam_defense)) {
-        if(APCG(slam_rand)==-1) {
-            APCG(slam_rand) = (int)(100.0*rand()/(RAND_MAX+1.0));
-        }
-        if(APCG(slam_rand) < APCG(slam_defense)) {
+
+    /* check our regular expression filters */
+    if (APCG(filters) && apc_compiled_filters && h->opened_path) {
+        int ret = apc_regex_match_array(apc_compiled_filters, h->opened_path);
+        if(ret == APC_NEGATIVE_MATCH || (ret != APC_POSITIVE_MATCH && !APCG(cache_by_default))) {
+            /* never cache, never find */
             return op_array;
         }
     }