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slub: Add statistics for this_cmpxchg_double failures 

Add some statistics for debugging.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2011-03-22 13:35:00 -05:00 committed by Pekka Enberg
parent 2fd66c517d
commit 4fdccdfbb4
2 changed files with 3 additions and 1 deletions
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1
include/linux/slub_def.h
View File

@ -32,6 +32,7 @@ enum stat_item {
DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
ORDER_FALLBACK, /* Number of times fallback was necessary */
CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
NR_SLUB_STAT_ITEMS };
struct kmem_cache_cpu {

3
mm/slub.c
View File

@ -217,7 +217,7 @@ static inline void sysfs_slab_remove(struct kmem_cache *s)
#endif
static inline void stat(struct kmem_cache *s, enum stat_item si)
static inline void stat(const struct kmem_cache *s, enum stat_item si)
{
#ifdef CONFIG_SLUB_STATS
__this_cpu_inc(s->cpu_slab->stat[si]);
@ -1597,6 +1597,7 @@ static inline void note_cmpxchg_failure(const char *n,
printk("for unknown reason: actual=%lx was=%lx target=%lx\n",
actual_tid, tid, next_tid(tid));
#endif
stat(s, CMPXCHG_DOUBLE_CPU_FAIL);
}
#endif