From: Christoph Lameter <cl@linux.com>
Date: Mon, 7 Apr 2014 22:39:42 +0000 (-0700)
Subject: slub: use raw_cpu_inc for incrementing statistics
X-Git-Tag: v3.15-rc1~57^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=88da03a67674bcd6e9ecf18a0a182cf1303056ba;p=pandora-kernel.git

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.

[akpm@linux-foundation.org: add comment]
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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