From 35e785ee677750ec6ca985a121cf0d88a0828988 Mon Sep 17 00:00:00 2001
From: Christoph Lameter <cl@linux.com>
Date: Sat, 22 Mar 2014 12:49:47 +1100
Subject: [PATCH] slub: use raw_cpu_inc for incrementing statistics

Statistics are not critical to the operation of the allocation
but should also not cause too much overhead.

When __this_cpu_inc is altered to check if preemption is disabled this
triggers.  Use raw_cpu_inc to avoid the checks.  Using this_cpu_ops may
cause interrupt disable/enable sequences on various arches which may
significantly impact allocator performance.

Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/slub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/slub.c b/mm/slub.c
index 5c6b2b26ec50e4..06852501a9c816 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -224,7 +224,7 @@ static inline void memcg_propagate_slab_attrs(struct kmem_cache *s) { }
 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]);
+	raw_cpu_inc(s->cpu_slab->stat[si]);
 #endif
 }