Merge branch 'slub-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm
* 'slub-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm: SLUB: fix checkpatch warnings Use non atomic unlock SLUB: Support for performance statistics SLUB: Alternate fast paths using cmpxchg_local SLUB: Use unique end pointer for each slab page. SLUB: Deal with annoying gcc warning on kfree()
This commit is contained in:
Linus Torvalds
Коммит
c00f08d705
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@ -32,6 +32,13 @@ struct slabinfo {
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int sanity_checks, slab_size, store_user, trace;
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int order, poison, reclaim_account, red_zone;
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unsigned long partial, objects, slabs;
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unsigned long alloc_fastpath, alloc_slowpath;
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unsigned long free_fastpath, free_slowpath;
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unsigned long free_frozen, free_add_partial, free_remove_partial;
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unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
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unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
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unsigned long deactivate_to_head, deactivate_to_tail;
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unsigned long deactivate_remote_frees;
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int numa[MAX_NODES];
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int numa_partial[MAX_NODES];
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} slabinfo[MAX_SLABS];
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@ -64,8 +71,10 @@ int show_inverted = 0;
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int show_single_ref = 0;
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int show_totals = 0;
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int sort_size = 0;
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int sort_active = 0;
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int set_debug = 0;
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int show_ops = 0;
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int show_activity = 0;
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/* Debug options */
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int sanity = 0;
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@ -93,8 +102,10 @@ void usage(void)
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printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
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"slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
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"-a|--aliases Show aliases\n"
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"-A|--activity Most active slabs first\n"
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"-d<options>|--debug=<options> Set/Clear Debug options\n"
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"-e|--empty Show empty slabs\n"
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"-D|--display-active Switch line format to activity\n"
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"-e|--empty Show empty slabs\n"
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"-f|--first-alias Show first alias\n"
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"-h|--help Show usage information\n"
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"-i|--inverted Inverted list\n"
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@ -281,8 +292,11 @@ int line = 0;
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void first_line(void)
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{
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printf("Name Objects Objsize Space "
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"Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
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if (show_activity)
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printf("Name Objects Alloc Free %%Fast\n");
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else
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printf("Name Objects Objsize Space "
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"Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
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}
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/*
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@ -309,6 +323,12 @@ unsigned long slab_size(struct slabinfo *s)
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return s->slabs * (page_size << s->order);
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}
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unsigned long slab_activity(struct slabinfo *s)
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{
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return s->alloc_fastpath + s->free_fastpath +
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s->alloc_slowpath + s->free_slowpath;
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}
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void slab_numa(struct slabinfo *s, int mode)
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{
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int node;
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@ -392,6 +412,71 @@ const char *onoff(int x)
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return "Off";
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}
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void slab_stats(struct slabinfo *s)
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{
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unsigned long total_alloc;
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unsigned long total_free;
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unsigned long total;
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if (!s->alloc_slab)
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return;
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total_alloc = s->alloc_fastpath + s->alloc_slowpath;
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total_free = s->free_fastpath + s->free_slowpath;
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if (!total_alloc)
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return;
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printf("\n");
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printf("Slab Perf Counter Alloc Free %%Al %%Fr\n");
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printf("--------------------------------------------------\n");
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printf("Fastpath %8lu %8lu %3lu %3lu\n",
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s->alloc_fastpath, s->free_fastpath,
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s->alloc_fastpath * 100 / total_alloc,
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s->free_fastpath * 100 / total_free);
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printf("Slowpath %8lu %8lu %3lu %3lu\n",
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total_alloc - s->alloc_fastpath, s->free_slowpath,
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(total_alloc - s->alloc_fastpath) * 100 / total_alloc,
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s->free_slowpath * 100 / total_free);
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printf("Page Alloc %8lu %8lu %3lu %3lu\n",
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s->alloc_slab, s->free_slab,
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s->alloc_slab * 100 / total_alloc,
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s->free_slab * 100 / total_free);
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printf("Add partial %8lu %8lu %3lu %3lu\n",
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s->deactivate_to_head + s->deactivate_to_tail,
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s->free_add_partial,
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(s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
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s->free_add_partial * 100 / total_free);
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printf("Remove partial %8lu %8lu %3lu %3lu\n",
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s->alloc_from_partial, s->free_remove_partial,
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s->alloc_from_partial * 100 / total_alloc,
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s->free_remove_partial * 100 / total_free);
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printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
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s->deactivate_remote_frees, s->free_frozen,
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s->deactivate_remote_frees * 100 / total_alloc,
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s->free_frozen * 100 / total_free);
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printf("Total %8lu %8lu\n\n", total_alloc, total_free);
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if (s->cpuslab_flush)
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printf("Flushes %8lu\n", s->cpuslab_flush);
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if (s->alloc_refill)
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printf("Refill %8lu\n", s->alloc_refill);
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total = s->deactivate_full + s->deactivate_empty +
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s->deactivate_to_head + s->deactivate_to_tail;
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if (total)
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printf("Deactivate Full=%lu(%lu%%) Empty=%lu(%lu%%) "
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"ToHead=%lu(%lu%%) ToTail=%lu(%lu%%)\n",
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s->deactivate_full, (s->deactivate_full * 100) / total,
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s->deactivate_empty, (s->deactivate_empty * 100) / total,
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s->deactivate_to_head, (s->deactivate_to_head * 100) / total,
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s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
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}
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void report(struct slabinfo *s)
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{
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if (strcmp(s->name, "*") == 0)
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@ -430,6 +515,7 @@ void report(struct slabinfo *s)
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ops(s);
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show_tracking(s);
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slab_numa(s, 1);
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slab_stats(s);
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}
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void slabcache(struct slabinfo *s)
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@ -479,13 +565,27 @@ void slabcache(struct slabinfo *s)
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*p++ = 'T';
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*p = 0;
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printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
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s->name, s->objects, s->object_size, size_str, dist_str,
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s->objs_per_slab, s->order,
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s->slabs ? (s->partial * 100) / s->slabs : 100,
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s->slabs ? (s->objects * s->object_size * 100) /
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(s->slabs * (page_size << s->order)) : 100,
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flags);
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if (show_activity) {
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unsigned long total_alloc;
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unsigned long total_free;
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total_alloc = s->alloc_fastpath + s->alloc_slowpath;
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total_free = s->free_fastpath + s->free_slowpath;
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printf("%-21s %8ld %8ld %8ld %3ld %3ld \n",
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s->name, s->objects,
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total_alloc, total_free,
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total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
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total_free ? (s->free_fastpath * 100 / total_free) : 0);
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}
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else
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printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
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s->name, s->objects, s->object_size, size_str, dist_str,
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s->objs_per_slab, s->order,
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s->slabs ? (s->partial * 100) / s->slabs : 100,
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s->slabs ? (s->objects * s->object_size * 100) /
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(s->slabs * (page_size << s->order)) : 100,
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flags);
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}
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/*
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@ -892,6 +992,8 @@ void sort_slabs(void)
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if (sort_size)
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result = slab_size(s1) < slab_size(s2);
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else if (sort_active)
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result = slab_activity(s1) < slab_activity(s2);
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else
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result = strcasecmp(s1->name, s2->name);
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@ -1074,6 +1176,23 @@ void read_slab_dir(void)
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free(t);
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slab->store_user = get_obj("store_user");
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slab->trace = get_obj("trace");
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slab->alloc_fastpath = get_obj("alloc_fastpath");
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slab->alloc_slowpath = get_obj("alloc_slowpath");
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slab->free_fastpath = get_obj("free_fastpath");
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slab->free_slowpath = get_obj("free_slowpath");
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slab->free_frozen= get_obj("free_frozen");
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slab->free_add_partial = get_obj("free_add_partial");
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slab->free_remove_partial = get_obj("free_remove_partial");
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slab->alloc_from_partial = get_obj("alloc_from_partial");
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slab->alloc_slab = get_obj("alloc_slab");
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slab->alloc_refill = get_obj("alloc_refill");
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slab->free_slab = get_obj("free_slab");
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slab->cpuslab_flush = get_obj("cpuslab_flush");
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slab->deactivate_full = get_obj("deactivate_full");
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slab->deactivate_empty = get_obj("deactivate_empty");
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slab->deactivate_to_head = get_obj("deactivate_to_head");
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slab->deactivate_to_tail = get_obj("deactivate_to_tail");
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slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
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chdir("..");
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if (slab->name[0] == ':')
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alias_targets++;
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@ -1124,7 +1243,9 @@ void output_slabs(void)
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struct option opts[] = {
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{ "aliases", 0, NULL, 'a' },
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{ "activity", 0, NULL, 'A' },
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{ "debug", 2, NULL, 'd' },
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{ "display-activity", 0, NULL, 'D' },
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{ "empty", 0, NULL, 'e' },
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{ "first-alias", 0, NULL, 'f' },
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{ "help", 0, NULL, 'h' },
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@ -1149,7 +1270,7 @@ int main(int argc, char *argv[])
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page_size = getpagesize();
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while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
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while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
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opts, NULL)) != -1)
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switch (c) {
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case '1':
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@ -1158,11 +1279,17 @@ int main(int argc, char *argv[])
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case 'a':
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show_alias = 1;
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break;
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case 'A':
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sort_active = 1;
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break;
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case 'd':
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set_debug = 1;
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if (!debug_opt_scan(optarg))
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fatal("Invalid debug option '%s'\n", optarg);
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break;
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case 'D':
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show_activity = 1;
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break;
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case 'e':
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show_empty = 1;
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break;
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@ -52,6 +52,10 @@ config HAVE_LATENCYTOP_SUPPORT
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config SEMAPHORE_SLEEPERS
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def_bool y
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config FAST_CMPXCHG_LOCAL
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bool
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default y
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config MMU
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def_bool y
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@ -64,7 +64,10 @@ struct page {
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#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
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spinlock_t ptl;
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#endif
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struct kmem_cache *slab; /* SLUB: Pointer to slab */
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struct {
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struct kmem_cache *slab; /* SLUB: Pointer to slab */
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void *end; /* SLUB: end marker */
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};
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struct page *first_page; /* Compound tail pages */
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};
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union {
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@ -11,12 +11,35 @@
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#include <linux/workqueue.h>
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#include <linux/kobject.h>
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enum stat_item {
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ALLOC_FASTPATH, /* Allocation from cpu slab */
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ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
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FREE_FASTPATH, /* Free to cpu slub */
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FREE_SLOWPATH, /* Freeing not to cpu slab */
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FREE_FROZEN, /* Freeing to frozen slab */
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FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
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FREE_REMOVE_PARTIAL, /* Freeing removes last object */
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ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
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ALLOC_SLAB, /* Cpu slab acquired from page allocator */
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ALLOC_REFILL, /* Refill cpu slab from slab freelist */
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FREE_SLAB, /* Slab freed to the page allocator */
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CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
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DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
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DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
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DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
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DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
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DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
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NR_SLUB_STAT_ITEMS };
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struct kmem_cache_cpu {
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void **freelist; /* Pointer to first free per cpu object */
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struct page *page; /* The slab from which we are allocating */
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int node; /* The node of the page (or -1 for debug) */
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unsigned int offset; /* Freepointer offset (in word units) */
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unsigned int objsize; /* Size of an object (from kmem_cache) */
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#ifdef CONFIG_SLUB_STATS
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unsigned stat[NR_SLUB_STAT_ITEMS];
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#endif
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};
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|
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struct kmem_cache_node {
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|
|
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@ -205,6 +205,19 @@ config SLUB_DEBUG_ON
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off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
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"slub_debug=-".
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config SLUB_STATS
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default n
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bool "Enable SLUB performance statistics"
|
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depends on SLUB
|
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help
|
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SLUB statistics are useful to debug SLUBs allocation behavior in
|
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order find ways to optimize the allocator. This should never be
|
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enabled for production use since keeping statistics slows down
|
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the allocator by a few percentage points. The slabinfo command
|
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supports the determination of the most active slabs to figure
|
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out which slabs are relevant to a particular load.
|
||||
Try running: slabinfo -DA
|
||||
|
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config DEBUG_PREEMPT
|
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bool "Debug preemptible kernel"
|
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depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
|
||||
|
|
|
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326
mm/slub.c
326
mm/slub.c
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@ -149,6 +149,13 @@ static inline void ClearSlabDebug(struct page *page)
|
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/* Enable to test recovery from slab corruption on boot */
|
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#undef SLUB_RESILIENCY_TEST
|
||||
|
||||
/*
|
||||
* Currently fastpath is not supported if preemption is enabled.
|
||||
*/
|
||||
#if defined(CONFIG_FAST_CMPXCHG_LOCAL) && !defined(CONFIG_PREEMPT)
|
||||
#define SLUB_FASTPATH
|
||||
#endif
|
||||
|
||||
#if PAGE_SHIFT <= 12
|
||||
|
||||
/*
|
||||
|
|
@ -243,6 +250,7 @@ enum track_item { TRACK_ALLOC, TRACK_FREE };
|
|||
static int sysfs_slab_add(struct kmem_cache *);
|
||||
static int sysfs_slab_alias(struct kmem_cache *, const char *);
|
||||
static void sysfs_slab_remove(struct kmem_cache *);
|
||||
|
||||
#else
|
||||
static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; }
|
||||
static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
|
||||
|
|
@ -251,8 +259,16 @@ static inline void sysfs_slab_remove(struct kmem_cache *s)
|
|||
{
|
||||
kfree(s);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
static inline void stat(struct kmem_cache_cpu *c, enum stat_item si)
|
||||
{
|
||||
#ifdef CONFIG_SLUB_STATS
|
||||
c->stat[si]++;
|
||||
#endif
|
||||
}
|
||||
|
||||
/********************************************************************
|
||||
* Core slab cache functions
|
||||
*******************************************************************/
|
||||
|
|
@ -280,15 +296,32 @@ static inline struct kmem_cache_cpu *get_cpu_slab(struct kmem_cache *s, int cpu)
|
|||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* The end pointer in a slab is special. It points to the first object in the
|
||||
* slab but has bit 0 set to mark it.
|
||||
*
|
||||
* Note that SLUB relies on page_mapping returning NULL for pages with bit 0
|
||||
* in the mapping set.
|
||||
*/
|
||||
static inline int is_end(void *addr)
|
||||
{
|
||||
return (unsigned long)addr & PAGE_MAPPING_ANON;
|
||||
}
|
||||
|
||||
void *slab_address(struct page *page)
|
||||
{
|
||||
return page->end - PAGE_MAPPING_ANON;
|
||||
}
|
||||
|
||||
static inline int check_valid_pointer(struct kmem_cache *s,
|
||||
struct page *page, const void *object)
|
||||
{
|
||||
void *base;
|
||||
|
||||
if (!object)
|
||||
if (object == page->end)
|
||||
return 1;
|
||||
|
||||
base = page_address(page);
|
||||
base = slab_address(page);
|
||||
if (object < base || object >= base + s->objects * s->size ||
|
||||
(object - base) % s->size) {
|
||||
return 0;
|
||||
|
|
@ -321,7 +354,8 @@ static inline void set_freepointer(struct kmem_cache *s, void *object, void *fp)
|
|||
|
||||
/* Scan freelist */
|
||||
#define for_each_free_object(__p, __s, __free) \
|
||||
for (__p = (__free); __p; __p = get_freepointer((__s), __p))
|
||||
for (__p = (__free); (__p) != page->end; __p = get_freepointer((__s),\
|
||||
__p))
|
||||
|
||||
/* Determine object index from a given position */
|
||||
static inline int slab_index(void *p, struct kmem_cache *s, void *addr)
|
||||
|
|
@ -473,7 +507,7 @@ static void slab_fix(struct kmem_cache *s, char *fmt, ...)
|
|||
static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
|
||||
{
|
||||
unsigned int off; /* Offset of last byte */
|
||||
u8 *addr = page_address(page);
|
||||
u8 *addr = slab_address(page);
|
||||
|
||||
print_tracking(s, p);
|
||||
|
||||
|
|
@ -651,7 +685,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
|
|||
if (!(s->flags & SLAB_POISON))
|
||||
return 1;
|
||||
|
||||
start = page_address(page);
|
||||
start = slab_address(page);
|
||||
end = start + (PAGE_SIZE << s->order);
|
||||
length = s->objects * s->size;
|
||||
remainder = end - (start + length);
|
||||
|
|
@ -685,9 +719,10 @@ static int check_object(struct kmem_cache *s, struct page *page,
|
|||
endobject, red, s->inuse - s->objsize))
|
||||
return 0;
|
||||
} else {
|
||||
if ((s->flags & SLAB_POISON) && s->objsize < s->inuse)
|
||||
check_bytes_and_report(s, page, p, "Alignment padding", endobject,
|
||||
POISON_INUSE, s->inuse - s->objsize);
|
||||
if ((s->flags & SLAB_POISON) && s->objsize < s->inuse) {
|
||||
check_bytes_and_report(s, page, p, "Alignment padding",
|
||||
endobject, POISON_INUSE, s->inuse - s->objsize);
|
||||
}
|
||||
}
|
||||
|
||||
if (s->flags & SLAB_POISON) {
|
||||
|
|
@ -718,7 +753,7 @@ static int check_object(struct kmem_cache *s, struct page *page,
|
|||
* of the free objects in this slab. May cause
|
||||
* another error because the object count is now wrong.
|
||||
*/
|
||||
set_freepointer(s, p, NULL);
|
||||
set_freepointer(s, p, page->end);
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
|
|
@ -752,18 +787,18 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
|
|||
void *fp = page->freelist;
|
||||
void *object = NULL;
|
||||
|
||||
while (fp && nr <= s->objects) {
|
||||
while (fp != page->end && nr <= s->objects) {
|
||||
if (fp == search)
|
||||
return 1;
|
||||
if (!check_valid_pointer(s, page, fp)) {
|
||||
if (object) {
|
||||
object_err(s, page, object,
|
||||
"Freechain corrupt");
|
||||
set_freepointer(s, object, NULL);
|
||||
set_freepointer(s, object, page->end);
|
||||
break;
|
||||
} else {
|
||||
slab_err(s, page, "Freepointer corrupt");
|
||||
page->freelist = NULL;
|
||||
page->freelist = page->end;
|
||||
page->inuse = s->objects;
|
||||
slab_fix(s, "Freelist cleared");
|
||||
return 0;
|
||||
|
|
@ -869,7 +904,7 @@ bad:
|
|||
*/
|
||||
slab_fix(s, "Marking all objects used");
|
||||
page->inuse = s->objects;
|
||||
page->freelist = NULL;
|
||||
page->freelist = page->end;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -894,11 +929,10 @@ static int free_debug_processing(struct kmem_cache *s, struct page *page,
|
|||
return 0;
|
||||
|
||||
if (unlikely(s != page->slab)) {
|
||||
if (!PageSlab(page))
|
||||
if (!PageSlab(page)) {
|
||||
slab_err(s, page, "Attempt to free object(0x%p) "
|
||||
"outside of slab", object);
|
||||
else
|
||||
if (!page->slab) {
|
||||
} else if (!page->slab) {
|
||||
printk(KERN_ERR
|
||||
"SLUB <none>: no slab for object 0x%p.\n",
|
||||
object);
|
||||
|
|
@ -910,7 +944,7 @@ static int free_debug_processing(struct kmem_cache *s, struct page *page,
|
|||
}
|
||||
|
||||
/* Special debug activities for freeing objects */
|
||||
if (!SlabFrozen(page) && !page->freelist)
|
||||
if (!SlabFrozen(page) && page->freelist == page->end)
|
||||
remove_full(s, page);
|
||||
if (s->flags & SLAB_STORE_USER)
|
||||
set_track(s, object, TRACK_FREE, addr);
|
||||
|
|
@ -1007,7 +1041,7 @@ static unsigned long kmem_cache_flags(unsigned long objsize,
|
|||
*/
|
||||
if (slub_debug && (!slub_debug_slabs ||
|
||||
strncmp(slub_debug_slabs, name,
|
||||
strlen(slub_debug_slabs)) == 0))
|
||||
strlen(slub_debug_slabs)) == 0))
|
||||
flags |= slub_debug;
|
||||
}
|
||||
|
||||
|
|
@ -1102,6 +1136,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
|
|||
SetSlabDebug(page);
|
||||
|
||||
start = page_address(page);
|
||||
page->end = start + 1;
|
||||
|
||||
if (unlikely(s->flags & SLAB_POISON))
|
||||
memset(start, POISON_INUSE, PAGE_SIZE << s->order);
|
||||
|
|
@ -1113,7 +1148,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
|
|||
last = p;
|
||||
}
|
||||
setup_object(s, page, last);
|
||||
set_freepointer(s, last, NULL);
|
||||
set_freepointer(s, last, page->end);
|
||||
|
||||
page->freelist = start;
|
||||
page->inuse = 0;
|
||||
|
|
@ -1129,7 +1164,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
|
|||
void *p;
|
||||
|
||||
slab_pad_check(s, page);
|
||||
for_each_object(p, s, page_address(page))
|
||||
for_each_object(p, s, slab_address(page))
|
||||
check_object(s, page, p, 0);
|
||||
ClearSlabDebug(page);
|
||||
}
|
||||
|
|
@ -1139,6 +1174,7 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
|
|||
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
|
||||
-pages);
|
||||
|
||||
page->mapping = NULL;
|
||||
__free_pages(page, s->order);
|
||||
}
|
||||
|
||||
|
|
@ -1183,7 +1219,7 @@ static __always_inline void slab_lock(struct page *page)
|
|||
|
||||
static __always_inline void slab_unlock(struct page *page)
|
||||
{
|
||||
bit_spin_unlock(PG_locked, &page->flags);
|
||||
__bit_spin_unlock(PG_locked, &page->flags);
|
||||
}
|
||||
|
||||
static __always_inline int slab_trylock(struct page *page)
|
||||
|
|
@ -1294,8 +1330,8 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
|
|||
get_cycles() % 1024 > s->remote_node_defrag_ratio)
|
||||
return NULL;
|
||||
|
||||
zonelist = &NODE_DATA(slab_node(current->mempolicy))
|
||||
->node_zonelists[gfp_zone(flags)];
|
||||
zonelist = &NODE_DATA(
|
||||
slab_node(current->mempolicy))->node_zonelists[gfp_zone(flags)];
|
||||
for (z = zonelist->zones; *z; z++) {
|
||||
struct kmem_cache_node *n;
|
||||
|
||||
|
|
@ -1337,17 +1373,22 @@ static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node)
|
|||
static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
|
||||
{
|
||||
struct kmem_cache_node *n = get_node(s, page_to_nid(page));
|
||||
struct kmem_cache_cpu *c = get_cpu_slab(s, smp_processor_id());
|
||||
|
||||
ClearSlabFrozen(page);
|
||||
if (page->inuse) {
|
||||
|
||||
if (page->freelist)
|
||||
if (page->freelist != page->end) {
|
||||
add_partial(n, page, tail);
|
||||
else if (SlabDebug(page) && (s->flags & SLAB_STORE_USER))
|
||||
add_full(n, page);
|
||||
stat(c, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD);
|
||||
} else {
|
||||
stat(c, DEACTIVATE_FULL);
|
||||
if (SlabDebug(page) && (s->flags & SLAB_STORE_USER))
|
||||
add_full(n, page);
|
||||
}
|
||||
slab_unlock(page);
|
||||
|
||||
} else {
|
||||
stat(c, DEACTIVATE_EMPTY);
|
||||
if (n->nr_partial < MIN_PARTIAL) {
|
||||
/*
|
||||
* Adding an empty slab to the partial slabs in order
|
||||
|
|
@ -1361,6 +1402,7 @@ static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail)
|
|||
slab_unlock(page);
|
||||
} else {
|
||||
slab_unlock(page);
|
||||
stat(get_cpu_slab(s, raw_smp_processor_id()), FREE_SLAB);
|
||||
discard_slab(s, page);
|
||||
}
|
||||
}
|
||||
|
|
@ -1373,12 +1415,19 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
|||
{
|
||||
struct page *page = c->page;
|
||||
int tail = 1;
|
||||
|
||||
if (c->freelist)
|
||||
stat(c, DEACTIVATE_REMOTE_FREES);
|
||||
/*
|
||||
* Merge cpu freelist into freelist. Typically we get here
|
||||
* because both freelists are empty. So this is unlikely
|
||||
* to occur.
|
||||
*
|
||||
* We need to use _is_end here because deactivate slab may
|
||||
* be called for a debug slab. Then c->freelist may contain
|
||||
* a dummy pointer.
|
||||
*/
|
||||
while (unlikely(c->freelist)) {
|
||||
while (unlikely(!is_end(c->freelist))) {
|
||||
void **object;
|
||||
|
||||
tail = 0; /* Hot objects. Put the slab first */
|
||||
|
|
@ -1398,6 +1447,7 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
|||
|
||||
static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
||||
{
|
||||
stat(c, CPUSLAB_FLUSH);
|
||||
slab_lock(c->page);
|
||||
deactivate_slab(s, c);
|
||||
}
|
||||
|
|
@ -1469,16 +1519,21 @@ static void *__slab_alloc(struct kmem_cache *s,
|
|||
{
|
||||
void **object;
|
||||
struct page *new;
|
||||
#ifdef SLUB_FASTPATH
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
#endif
|
||||
if (!c->page)
|
||||
goto new_slab;
|
||||
|
||||
slab_lock(c->page);
|
||||
if (unlikely(!node_match(c, node)))
|
||||
goto another_slab;
|
||||
stat(c, ALLOC_REFILL);
|
||||
load_freelist:
|
||||
object = c->page->freelist;
|
||||
if (unlikely(!object))
|
||||
if (unlikely(object == c->page->end))
|
||||
goto another_slab;
|
||||
if (unlikely(SlabDebug(c->page)))
|
||||
goto debug;
|
||||
|
|
@ -1486,9 +1541,15 @@ load_freelist:
|
|||
object = c->page->freelist;
|
||||
c->freelist = object[c->offset];
|
||||
c->page->inuse = s->objects;
|
||||
c->page->freelist = NULL;
|
||||
c->page->freelist = c->page->end;
|
||||
c->node = page_to_nid(c->page);
|
||||
unlock_out:
|
||||
slab_unlock(c->page);
|
||||
stat(c, ALLOC_SLOWPATH);
|
||||
out:
|
||||
#ifdef SLUB_FASTPATH
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
return object;
|
||||
|
||||
another_slab:
|
||||
|
|
@ -1498,6 +1559,7 @@ new_slab:
|
|||
new = get_partial(s, gfpflags, node);
|
||||
if (new) {
|
||||
c->page = new;
|
||||
stat(c, ALLOC_FROM_PARTIAL);
|
||||
goto load_freelist;
|
||||
}
|
||||
|
||||
|
|
@ -1511,6 +1573,7 @@ new_slab:
|
|||
|
||||
if (new) {
|
||||
c = get_cpu_slab(s, smp_processor_id());
|
||||
stat(c, ALLOC_SLAB);
|
||||
if (c->page)
|
||||
flush_slab(s, c);
|
||||
slab_lock(new);
|
||||
|
|
@ -1518,7 +1581,8 @@ new_slab:
|
|||
c->page = new;
|
||||
goto load_freelist;
|
||||
}
|
||||
return NULL;
|
||||
object = NULL;
|
||||
goto out;
|
||||
debug:
|
||||
object = c->page->freelist;
|
||||
if (!alloc_debug_processing(s, c->page, object, addr))
|
||||
|
|
@ -1527,8 +1591,7 @@ debug:
|
|||
c->page->inuse++;
|
||||
c->page->freelist = object[c->offset];
|
||||
c->node = -1;
|
||||
slab_unlock(c->page);
|
||||
return object;
|
||||
goto unlock_out;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -1545,20 +1608,50 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
|
|||
gfp_t gfpflags, int node, void *addr)
|
||||
{
|
||||
void **object;
|
||||
unsigned long flags;
|
||||
struct kmem_cache_cpu *c;
|
||||
|
||||
/*
|
||||
* The SLUB_FASTPATH path is provisional and is currently disabled if the
|
||||
* kernel is compiled with preemption or if the arch does not support
|
||||
* fast cmpxchg operations. There are a couple of coming changes that will
|
||||
* simplify matters and allow preemption. Ultimately we may end up making
|
||||
* SLUB_FASTPATH the default.
|
||||
*
|
||||
* 1. The introduction of the per cpu allocator will avoid array lookups
|
||||
* through get_cpu_slab(). A special register can be used instead.
|
||||
*
|
||||
* 2. The introduction of per cpu atomic operations (cpu_ops) means that
|
||||
* we can realize the logic here entirely with per cpu atomics. The
|
||||
* per cpu atomic ops will take care of the preemption issues.
|
||||
*/
|
||||
|
||||
#ifdef SLUB_FASTPATH
|
||||
c = get_cpu_slab(s, raw_smp_processor_id());
|
||||
do {
|
||||
object = c->freelist;
|
||||
if (unlikely(is_end(object) || !node_match(c, node))) {
|
||||
object = __slab_alloc(s, gfpflags, node, addr, c);
|
||||
break;
|
||||
}
|
||||
stat(c, ALLOC_FASTPATH);
|
||||
} while (cmpxchg_local(&c->freelist, object, object[c->offset])
|
||||
!= object);
|
||||
#else
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
c = get_cpu_slab(s, smp_processor_id());
|
||||
if (unlikely(!c->freelist || !node_match(c, node)))
|
||||
if (unlikely(is_end(c->freelist) || !node_match(c, node)))
|
||||
|
||||
object = __slab_alloc(s, gfpflags, node, addr, c);
|
||||
|
||||
else {
|
||||
object = c->freelist;
|
||||
c->freelist = object[c->offset];
|
||||
stat(c, ALLOC_FASTPATH);
|
||||
}
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
|
||||
if (unlikely((gfpflags & __GFP_ZERO) && object))
|
||||
memset(object, 0, c->objsize);
|
||||
|
|
@ -1593,7 +1686,15 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
|
|||
{
|
||||
void *prior;
|
||||
void **object = (void *)x;
|
||||
struct kmem_cache_cpu *c;
|
||||
|
||||
#ifdef SLUB_FASTPATH
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
#endif
|
||||
c = get_cpu_slab(s, raw_smp_processor_id());
|
||||
stat(c, FREE_SLOWPATH);
|
||||
slab_lock(page);
|
||||
|
||||
if (unlikely(SlabDebug(page)))
|
||||
|
|
@ -1603,8 +1704,10 @@ checks_ok:
|
|||
page->freelist = object;
|
||||
page->inuse--;
|
||||
|
||||
if (unlikely(SlabFrozen(page)))
|
||||
if (unlikely(SlabFrozen(page))) {
|
||||
stat(c, FREE_FROZEN);
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
if (unlikely(!page->inuse))
|
||||
goto slab_empty;
|
||||
|
|
@ -1614,21 +1717,31 @@ checks_ok:
|
|||
* was not on the partial list before
|
||||
* then add it.
|
||||
*/
|
||||
if (unlikely(!prior))
|
||||
if (unlikely(prior == page->end)) {
|
||||
add_partial(get_node(s, page_to_nid(page)), page, 1);
|
||||
stat(c, FREE_ADD_PARTIAL);
|
||||
}
|
||||
|
||||
out_unlock:
|
||||
slab_unlock(page);
|
||||
#ifdef SLUB_FASTPATH
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
return;
|
||||
|
||||
slab_empty:
|
||||
if (prior)
|
||||
if (prior != page->end) {
|
||||
/*
|
||||
* Slab still on the partial list.
|
||||
*/
|
||||
remove_partial(s, page);
|
||||
|
||||
stat(c, FREE_REMOVE_PARTIAL);
|
||||
}
|
||||
slab_unlock(page);
|
||||
stat(c, FREE_SLAB);
|
||||
#ifdef SLUB_FASTPATH
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
discard_slab(s, page);
|
||||
return;
|
||||
|
||||
|
|
@ -1653,19 +1766,49 @@ static __always_inline void slab_free(struct kmem_cache *s,
|
|||
struct page *page, void *x, void *addr)
|
||||
{
|
||||
void **object = (void *)x;
|
||||
unsigned long flags;
|
||||
struct kmem_cache_cpu *c;
|
||||
|
||||
#ifdef SLUB_FASTPATH
|
||||
void **freelist;
|
||||
|
||||
c = get_cpu_slab(s, raw_smp_processor_id());
|
||||
debug_check_no_locks_freed(object, s->objsize);
|
||||
do {
|
||||
freelist = c->freelist;
|
||||
barrier();
|
||||
/*
|
||||
* If the compiler would reorder the retrieval of c->page to
|
||||
* come before c->freelist then an interrupt could
|
||||
* change the cpu slab before we retrieve c->freelist. We
|
||||
* could be matching on a page no longer active and put the
|
||||
* object onto the freelist of the wrong slab.
|
||||
*
|
||||
* On the other hand: If we already have the freelist pointer
|
||||
* then any change of cpu_slab will cause the cmpxchg to fail
|
||||
* since the freelist pointers are unique per slab.
|
||||
*/
|
||||
if (unlikely(page != c->page || c->node < 0)) {
|
||||
__slab_free(s, page, x, addr, c->offset);
|
||||
break;
|
||||
}
|
||||
object[c->offset] = freelist;
|
||||
stat(c, FREE_FASTPATH);
|
||||
} while (cmpxchg_local(&c->freelist, freelist, object) != freelist);
|
||||
#else
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
debug_check_no_locks_freed(object, s->objsize);
|
||||
c = get_cpu_slab(s, smp_processor_id());
|
||||
if (likely(page == c->page && c->node >= 0)) {
|
||||
object[c->offset] = c->freelist;
|
||||
c->freelist = object;
|
||||
stat(c, FREE_FASTPATH);
|
||||
} else
|
||||
__slab_free(s, page, x, addr, c->offset);
|
||||
|
||||
local_irq_restore(flags);
|
||||
#endif
|
||||
}
|
||||
|
||||
void kmem_cache_free(struct kmem_cache *s, void *x)
|
||||
|
|
@ -1842,7 +1985,7 @@ static void init_kmem_cache_cpu(struct kmem_cache *s,
|
|||
struct kmem_cache_cpu *c)
|
||||
{
|
||||
c->page = NULL;
|
||||
c->freelist = NULL;
|
||||
c->freelist = (void *)PAGE_MAPPING_ANON;
|
||||
c->node = 0;
|
||||
c->offset = s->offset / sizeof(void *);
|
||||
c->objsize = s->objsize;
|
||||
|
|
@ -2446,7 +2589,8 @@ static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags)
|
|||
goto unlock_out;
|
||||
|
||||
realsize = kmalloc_caches[index].objsize;
|
||||
text = kasprintf(flags & ~SLUB_DMA, "kmalloc_dma-%d", (unsigned int)realsize),
|
||||
text = kasprintf(flags & ~SLUB_DMA, "kmalloc_dma-%d",
|
||||
(unsigned int)realsize);
|
||||
s = kmalloc(kmem_size, flags & ~SLUB_DMA);
|
||||
|
||||
if (!s || !text || !kmem_cache_open(s, flags, text,
|
||||
|
|
@ -2601,6 +2745,7 @@ EXPORT_SYMBOL(ksize);
|
|||
void kfree(const void *x)
|
||||
{
|
||||
struct page *page;
|
||||
void *object = (void *)x;
|
||||
|
||||
if (unlikely(ZERO_OR_NULL_PTR(x)))
|
||||
return;
|
||||
|
|
@ -2610,7 +2755,7 @@ void kfree(const void *x)
|
|||
put_page(page);
|
||||
return;
|
||||
}
|
||||
slab_free(page->slab, page, (void *)x, __builtin_return_address(0));
|
||||
slab_free(page->slab, page, object, __builtin_return_address(0));
|
||||
}
|
||||
EXPORT_SYMBOL(kfree);
|
||||
|
||||
|
|
@ -2896,7 +3041,8 @@ void __init kmem_cache_init(void)
|
|||
#endif
|
||||
|
||||
|
||||
printk(KERN_INFO "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
|
||||
printk(KERN_INFO
|
||||
"SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
|
||||
" CPUs=%d, Nodes=%d\n",
|
||||
caches, cache_line_size(),
|
||||
slub_min_order, slub_max_order, slub_min_objects,
|
||||
|
|
@ -3063,7 +3209,7 @@ static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb,
|
|||
}
|
||||
|
||||
static struct notifier_block __cpuinitdata slab_notifier = {
|
||||
&slab_cpuup_callback, NULL, 0
|
||||
.notifier_call = slab_cpuup_callback
|
||||
};
|
||||
|
||||
#endif
|
||||
|
|
@ -3104,7 +3250,7 @@ static int validate_slab(struct kmem_cache *s, struct page *page,
|
|||
unsigned long *map)
|
||||
{
|
||||
void *p;
|
||||
void *addr = page_address(page);
|
||||
void *addr = slab_address(page);
|
||||
|
||||
if (!check_slab(s, page) ||
|
||||
!on_freelist(s, page, NULL))
|
||||
|
|
@ -3221,8 +3367,9 @@ static void resiliency_test(void)
|
|||
p = kzalloc(32, GFP_KERNEL);
|
||||
p[32 + sizeof(void *)] = 0x34;
|
||||
printk(KERN_ERR "\n2. kmalloc-32: Clobber next pointer/next slab"
|
||||
" 0x34 -> -0x%p\n", p);
|
||||
printk(KERN_ERR "If allocated object is overwritten then not detectable\n\n");
|
||||
" 0x34 -> -0x%p\n", p);
|
||||
printk(KERN_ERR
|
||||
"If allocated object is overwritten then not detectable\n\n");
|
||||
|
||||
validate_slab_cache(kmalloc_caches + 5);
|
||||
p = kzalloc(64, GFP_KERNEL);
|
||||
|
|
@ -3230,7 +3377,8 @@ static void resiliency_test(void)
|
|||
*p = 0x56;
|
||||
printk(KERN_ERR "\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n",
|
||||
p);
|
||||
printk(KERN_ERR "If allocated object is overwritten then not detectable\n\n");
|
||||
printk(KERN_ERR
|
||||
"If allocated object is overwritten then not detectable\n\n");
|
||||
validate_slab_cache(kmalloc_caches + 6);
|
||||
|
||||
printk(KERN_ERR "\nB. Corruption after free\n");
|
||||
|
|
@ -3243,7 +3391,8 @@ static void resiliency_test(void)
|
|||
p = kzalloc(256, GFP_KERNEL);
|
||||
kfree(p);
|
||||
p[50] = 0x9a;
|
||||
printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", p);
|
||||
printk(KERN_ERR "\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n",
|
||||
p);
|
||||
validate_slab_cache(kmalloc_caches + 8);
|
||||
|
||||
p = kzalloc(512, GFP_KERNEL);
|
||||
|
|
@ -3384,7 +3533,7 @@ static int add_location(struct loc_track *t, struct kmem_cache *s,
|
|||
static void process_slab(struct loc_track *t, struct kmem_cache *s,
|
||||
struct page *page, enum track_item alloc)
|
||||
{
|
||||
void *addr = page_address(page);
|
||||
void *addr = slab_address(page);
|
||||
DECLARE_BITMAP(map, s->objects);
|
||||
void *p;
|
||||
|
||||
|
|
@ -3872,6 +4021,62 @@ static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s,
|
|||
SLAB_ATTR(remote_node_defrag_ratio);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_SLUB_STATS
|
||||
|
||||
static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si)
|
||||
{
|
||||
unsigned long sum = 0;
|
||||
int cpu;
|
||||
int len;
|
||||
int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL);
|
||||
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
for_each_online_cpu(cpu) {
|
||||
unsigned x = get_cpu_slab(s, cpu)->stat[si];
|
||||
|
||||
data[cpu] = x;
|
||||
sum += x;
|
||||
}
|
||||
|
||||
len = sprintf(buf, "%lu", sum);
|
||||
|
||||
for_each_online_cpu(cpu) {
|
||||
if (data[cpu] && len < PAGE_SIZE - 20)
|
||||
len += sprintf(buf + len, " c%d=%u", cpu, data[cpu]);
|
||||
}
|
||||
kfree(data);
|
||||
return len + sprintf(buf + len, "\n");
|
||||
}
|
||||
|
||||
#define STAT_ATTR(si, text) \
|
||||
static ssize_t text##_show(struct kmem_cache *s, char *buf) \
|
||||
{ \
|
||||
return show_stat(s, buf, si); \
|
||||
} \
|
||||
SLAB_ATTR_RO(text); \
|
||||
|
||||
STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath);
|
||||
STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath);
|
||||
STAT_ATTR(FREE_FASTPATH, free_fastpath);
|
||||
STAT_ATTR(FREE_SLOWPATH, free_slowpath);
|
||||
STAT_ATTR(FREE_FROZEN, free_frozen);
|
||||
STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial);
|
||||
STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial);
|
||||
STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial);
|
||||
STAT_ATTR(ALLOC_SLAB, alloc_slab);
|
||||
STAT_ATTR(ALLOC_REFILL, alloc_refill);
|
||||
STAT_ATTR(FREE_SLAB, free_slab);
|
||||
STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush);
|
||||
STAT_ATTR(DEACTIVATE_FULL, deactivate_full);
|
||||
STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty);
|
||||
STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head);
|
||||
STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail);
|
||||
STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees);
|
||||
|
||||
#endif
|
||||
|
||||
static struct attribute *slab_attrs[] = {
|
||||
&slab_size_attr.attr,
|
||||
&object_size_attr.attr,
|
||||
|
|
@ -3901,6 +4106,25 @@ static struct attribute *slab_attrs[] = {
|
|||
#endif
|
||||
#ifdef CONFIG_NUMA
|
||||
&remote_node_defrag_ratio_attr.attr,
|
||||
#endif
|
||||
#ifdef CONFIG_SLUB_STATS
|
||||
&alloc_fastpath_attr.attr,
|
||||
&alloc_slowpath_attr.attr,
|
||||
&free_fastpath_attr.attr,
|
||||
&free_slowpath_attr.attr,
|
||||
&free_frozen_attr.attr,
|
||||
&free_add_partial_attr.attr,
|
||||
&free_remove_partial_attr.attr,
|
||||
&alloc_from_partial_attr.attr,
|
||||
&alloc_slab_attr.attr,
|
||||
&alloc_refill_attr.attr,
|
||||
&free_slab_attr.attr,
|
||||
&cpuslab_flush_attr.attr,
|
||||
&deactivate_full_attr.attr,
|
||||
&deactivate_empty_attr.attr,
|
||||
&deactivate_to_head_attr.attr,
|
||||
&deactivate_to_tail_attr.attr,
|
||||
&deactivate_remote_frees_attr.attr,
|
||||
#endif
|
||||
NULL
|
||||
};
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче