Add some statistics for debugging.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
include/linux/slub_def.h | 1 +
mm/slub.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6/include/linux/slub_def.h
===================================================================
--- linux-2.6.orig/include/linux/slub_def.h 2011-03-11 10:34:26.000000000 -0600
+++ linux-2.6/include/linux/slub_def.h 2011-03-11 10:34:49.000000000 -0600
@@ -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 {
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2011-03-11 10:34:27.000000000 -0600
+++ linux-2.6/mm/slub.c 2011-03-11 10:34:49.000000000 -0600
@@ -217,7 +217,7 @@ static inline void sysfs_slab_remove(str
#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]);
@@ -1551,6 +1551,7 @@ static inline void note_cmpxchg_failure(
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
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