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Commit 4fdccdfb authored by Christoph Lameter's avatar Christoph Lameter Committed by Pekka Enberg
Browse files

slub: Add statistics for this_cmpxchg_double failures 



Add some statistics for debugging.

Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarPekka Enberg <penberg@kernel.org>
parent 2fd66c51

include/linux/slub_def.h

+1 −0
Original line number Diff line number Diff line
@@ -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 {

mm/slub.c

+2 −1
Original line number Diff line number Diff line
@@ -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