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-rw-r--r--Documentation/vm/slabinfo.c149
-rw-r--r--include/linux/slub_def.h23
-rw-r--r--lib/Kconfig.debug13
-rw-r--r--mm/slub.c127
4 files changed, 293 insertions, 19 deletions
diff --git a/Documentation/vm/slabinfo.c b/Documentation/vm/slabinfo.c
index 488c1f3..7123fee 100644
--- a/Documentation/vm/slabinfo.c
+++ b/Documentation/vm/slabinfo.c
@@ -32,6 +32,13 @@ struct slabinfo {
int sanity_checks, slab_size, store_user, trace;
int order, poison, reclaim_account, red_zone;
unsigned long partial, objects, slabs;
+ unsigned long alloc_fastpath, alloc_slowpath;
+ unsigned long free_fastpath, free_slowpath;
+ unsigned long free_frozen, free_add_partial, free_remove_partial;
+ unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
+ unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
+ unsigned long deactivate_to_head, deactivate_to_tail;
+ unsigned long deactivate_remote_frees;
int numa[MAX_NODES];
int numa_partial[MAX_NODES];
} slabinfo[MAX_SLABS];
@@ -64,8 +71,10 @@ int show_inverted = 0;
int show_single_ref = 0;
int show_totals = 0;
int sort_size = 0;
+int sort_active = 0;
int set_debug = 0;
int show_ops = 0;
+int show_activity = 0;
/* Debug options */
int sanity = 0;
@@ -93,8 +102,10 @@ void usage(void)
printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
"slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
"-a|--aliases Show aliases\n"
+ "-A|--activity Most active slabs first\n"
"-d<options>|--debug=<options> Set/Clear Debug options\n"
- "-e|--empty Show empty slabs\n"
+ "-D|--display-active Switch line format to activity\n"
+ "-e|--empty Show empty slabs\n"
"-f|--first-alias Show first alias\n"
"-h|--help Show usage information\n"
"-i|--inverted Inverted list\n"
@@ -281,8 +292,11 @@ int line = 0;
void first_line(void)
{
- printf("Name Objects Objsize Space "
- "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
+ if (show_activity)
+ printf("Name Objects Alloc Free %%Fast\n");
+ else
+ printf("Name Objects Objsize Space "
+ "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
}
/*
@@ -309,6 +323,12 @@ unsigned long slab_size(struct slabinfo *s)
return s->slabs * (page_size << s->order);
}
+unsigned long slab_activity(struct slabinfo *s)
+{
+ return s->alloc_fastpath + s->free_fastpath +
+ s->alloc_slowpath + s->free_slowpath;
+}
+
void slab_numa(struct slabinfo *s, int mode)
{
int node;
@@ -392,6 +412,71 @@ const char *onoff(int x)
return "Off";
}
+void slab_stats(struct slabinfo *s)
+{
+ unsigned long total_alloc;
+ unsigned long total_free;
+ unsigned long total;
+
+ if (!s->alloc_slab)
+ return;
+
+ total_alloc = s->alloc_fastpath + s->alloc_slowpath;
+ total_free = s->free_fastpath + s->free_slowpath;
+
+ if (!total_alloc)
+ return;
+
+ printf("\n");
+ printf("Slab Perf Counter Alloc Free %%Al %%Fr\n");
+ printf("--------------------------------------------------\n");
+ printf("Fastpath %8lu %8lu %3lu %3lu\n",
+ s->alloc_fastpath, s->free_fastpath,
+ s->alloc_fastpath * 100 / total_alloc,
+ s->free_fastpath * 100 / total_free);
+ printf("Slowpath %8lu %8lu %3lu %3lu\n",
+ total_alloc - s->alloc_fastpath, s->free_slowpath,
+ (total_alloc - s->alloc_fastpath) * 100 / total_alloc,
+ s->free_slowpath * 100 / total_free);
+ printf("Page Alloc %8lu %8lu %3lu %3lu\n",
+ s->alloc_slab, s->free_slab,
+ s->alloc_slab * 100 / total_alloc,
+ s->free_slab * 100 / total_free);
+ printf("Add partial %8lu %8lu %3lu %3lu\n",
+ s->deactivate_to_head + s->deactivate_to_tail,
+ s->free_add_partial,
+ (s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
+ s->free_add_partial * 100 / total_free);
+ printf("Remove partial %8lu %8lu %3lu %3lu\n",
+ s->alloc_from_partial, s->free_remove_partial,
+ s->alloc_from_partial * 100 / total_alloc,
+ s->free_remove_partial * 100 / total_free);
+
+ printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
+ s->deactivate_remote_frees, s->free_frozen,
+ s->deactivate_remote_frees * 100 / total_alloc,
+ s->free_frozen * 100 / total_free);
+
+ printf("Total %8lu %8lu\n\n", total_alloc, total_free);
+
+ if (s->cpuslab_flush)
+ printf("Flushes %8lu\n", s->cpuslab_flush);
+
+ if (s->alloc_refill)
+ printf("Refill %8lu\n", s->alloc_refill);
+
+ total = s->deactivate_full + s->deactivate_empty +
+ s->deactivate_to_head + s->deactivate_to_tail;
+
+ if (total)
+ printf("Deactivate Full=%lu(%lu%%) Empty=%lu(%lu%%) "
+ "ToHead=%lu(%lu%%) ToTail=%lu(%lu%%)\n",
+ s->deactivate_full, (s->deactivate_full * 100) / total,
+ s->deactivate_empty, (s->deactivate_empty * 100) / total,
+ s->deactivate_to_head, (s->deactivate_to_head * 100) / total,
+ s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
+}
+
void report(struct slabinfo *s)
{
if (strcmp(s->name, "*") == 0)
@@ -430,6 +515,7 @@ void report(struct slabinfo *s)
ops(s);
show_tracking(s);
slab_numa(s, 1);
+ slab_stats(s);
}
void slabcache(struct slabinfo *s)
@@ -479,13 +565,27 @@ void slabcache(struct slabinfo *s)
*p++ = 'T';
*p = 0;
- printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
- s->name, s->objects, s->object_size, size_str, dist_str,
- s->objs_per_slab, s->order,
- s->slabs ? (s->partial * 100) / s->slabs : 100,
- s->slabs ? (s->objects * s->object_size * 100) /
- (s->slabs * (page_size << s->order)) : 100,
- flags);
+ if (show_activity) {
+ unsigned long total_alloc;
+ unsigned long total_free;
+
+ total_alloc = s->alloc_fastpath + s->alloc_slowpath;
+ total_free = s->free_fastpath + s->free_slowpath;
+
+ printf("%-21s %8ld %8ld %8ld %3ld %3ld \n",
+ s->name, s->objects,
+ total_alloc, total_free,
+ total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
+ total_free ? (s->free_fastpath * 100 / total_free) : 0);
+ }
+ else
+ printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
+ s->name, s->objects, s->object_size, size_str, dist_str,
+ s->objs_per_slab, s->order,
+ s->slabs ? (s->partial * 100) / s->slabs : 100,
+ s->slabs ? (s->objects * s->object_size * 100) /
+ (s->slabs * (page_size << s->order)) : 100,
+ flags);
}
/*
@@ -892,6 +992,8 @@ void sort_slabs(void)
if (sort_size)
result = slab_size(s1) < slab_size(s2);
+ else if (sort_active)
+ result = slab_activity(s1) < slab_activity(s2);
else
result = strcasecmp(s1->name, s2->name);
@@ -1074,6 +1176,23 @@ void read_slab_dir(void)
free(t);
slab->store_user = get_obj("store_user");
slab->trace = get_obj("trace");
+ slab->alloc_fastpath = get_obj("alloc_fastpath");
+ slab->alloc_slowpath = get_obj("alloc_slowpath");
+ slab->free_fastpath = get_obj("free_fastpath");
+ slab->free_slowpath = get_obj("free_slowpath");
+ slab->free_frozen= get_obj("free_frozen");
+ slab->free_add_partial = get_obj("free_add_partial");
+ slab->free_remove_partial = get_obj("free_remove_partial");
+ slab->alloc_from_partial = get_obj("alloc_from_partial");
+ slab->alloc_slab = get_obj("alloc_slab");
+ slab->alloc_refill = get_obj("alloc_refill");
+ slab->free_slab = get_obj("free_slab");
+ slab->cpuslab_flush = get_obj("cpuslab_flush");
+ slab->deactivate_full = get_obj("deactivate_full");
+ slab->deactivate_empty = get_obj("deactivate_empty");
+ slab->deactivate_to_head = get_obj("deactivate_to_head");
+ slab->deactivate_to_tail = get_obj("deactivate_to_tail");
+ slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
chdir("..");
if (slab->name[0] == ':')
alias_targets++;
@@ -1124,7 +1243,9 @@ void output_slabs(void)
struct option opts[] = {
{ "aliases", 0, NULL, 'a' },
+ { "activity", 0, NULL, 'A' },
{ "debug", 2, NULL, 'd' },
+ { "display-activity", 0, NULL, 'D' },
{ "empty", 0, NULL, 'e' },
{ "first-alias", 0, NULL, 'f' },
{ "help", 0, NULL, 'h' },
@@ -1149,7 +1270,7 @@ int main(int argc, char *argv[])
page_size = getpagesize();
- while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
+ while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
opts, NULL)) != -1)
switch (c) {
case '1':
@@ -1158,11 +1279,17 @@ int main(int argc, char *argv[])
case 'a':
show_alias = 1;
break;
+ case 'A':
+ sort_active = 1;
+ break;
case 'd':
set_debug = 1;
if (!debug_opt_scan(optarg))
fatal("Invalid debug option '%s'\n", optarg);
break;
+ case 'D':
+ show_activity = 1;
+ break;
case 'e':
show_empty = 1;
break;
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index ddb1a70..5e6d3d6 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -11,12 +11,35 @@
#include <linux/workqueue.h>
#include <linux/kobject.h>
+enum stat_item {
+ ALLOC_FASTPATH, /* Allocation from cpu slab */
+ ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
+ FREE_FASTPATH, /* Free to cpu slub */
+ FREE_SLOWPATH, /* Freeing not to cpu slab */
+ FREE_FROZEN, /* Freeing to frozen slab */
+ FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
+ FREE_REMOVE_PARTIAL, /* Freeing removes last object */
+ ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */
+ ALLOC_SLAB, /* Cpu slab acquired from page allocator */
+ ALLOC_REFILL, /* Refill cpu slab from slab freelist */
+ FREE_SLAB, /* Slab freed to the page allocator */
+ CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
+ DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
+ DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
+ DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
+ DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
+ DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
+ NR_SLUB_STAT_ITEMS };
+
struct kmem_cache_cpu {
void **freelist; /* Pointer to first free per cpu object */
struct page *page; /* The slab from which we are allocating */
int node; /* The node of the page (or -1 for debug) */
unsigned int offset; /* Freepointer offset (in word units) */
unsigned int objsize; /* Size of an object (from kmem_cache) */
+#ifdef CONFIG_SLUB_STATS
+ unsigned stat[NR_SLUB_STAT_ITEMS];
+#endif
};
struct kmem_cache_node {
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 0d385be..4f4008f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -205,6 +205,19 @@ config SLUB_DEBUG_ON
off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
"slub_debug=-".
+config SLUB_STATS
+ default n
+ bool "Enable SLUB performance statistics"
+ depends on SLUB
+ help
+ SLUB statistics are useful to debug SLUBs allocation behavior in
+ order find ways to optimize the allocator. This should never be
+ enabled for production use since keeping statistics slows down
+ the allocator by a few percentage points. The slabinfo command
+ supports the determination of the most active slabs to figure
+ out which slabs are relevant to a particular load.
+ Try running: slabinfo -DA
+
config DEBUG_PREEMPT
bool "Debug preemptible kernel"
depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
diff --git a/mm/slub.c b/mm/slub.c
index 20ab8f0..ac836d3 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -250,6 +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)
@@ -258,8 +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
*******************************************************************/
@@ -1364,17 +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 != page->end)
+ 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
@@ -1388,6 +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);
}
}
@@ -1400,6 +1415,9 @@ 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
@@ -1429,6 +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);
}
@@ -1511,6 +1530,7 @@ static void *__slab_alloc(struct kmem_cache *s,
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 == c->page->end))
@@ -1525,6 +1545,7 @@ load_freelist:
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);
@@ -1538,6 +1559,7 @@ new_slab:
new = get_partial(s, gfpflags, node);
if (new) {
c->page = new;
+ stat(c, ALLOC_FROM_PARTIAL);
goto load_freelist;
}
@@ -1551,6 +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);
@@ -1610,6 +1633,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
object = __slab_alloc(s, gfpflags, node, addr, c);
break;
}
+ stat(c, ALLOC_FASTPATH);
} while (cmpxchg_local(&c->freelist, object, object[c->offset])
!= object);
#else
@@ -1624,6 +1648,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
else {
object = c->freelist;
c->freelist = object[c->offset];
+ stat(c, ALLOC_FASTPATH);
}
local_irq_restore(flags);
#endif
@@ -1661,12 +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)))
@@ -1676,8 +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;
@@ -1687,8 +1717,10 @@ checks_ok:
* was not on the partial list before
* then add it.
*/
- if (unlikely(prior == page->end))
+ 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);
@@ -1698,13 +1730,15 @@ out_unlock:
return;
slab_empty:
- if (prior != page->end)
+ 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
@@ -1758,6 +1792,7 @@ static __always_inline void slab_free(struct kmem_cache *s,
break;
}
object[c->offset] = freelist;
+ stat(c, FREE_FASTPATH);
} while (cmpxchg_local(&c->freelist, freelist, object) != freelist);
#else
unsigned long flags;
@@ -1768,6 +1803,7 @@ static __always_inline void slab_free(struct kmem_cache *s,
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);
@@ -3980,6 +4016,62 @@ 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,
@@ -4010,6 +4102,25 @@ static struct attribute *slab_attrs[] = {
#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
};
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