From: Siddha, Suresh B <suresh.b.siddha@intel.com>
Date: Wed, 22 Aug 2007 21:01:49 +0000 (-0700)
Subject: slab: skip calling cache_free_alien() when the platform is not numa capable
X-Git-Tag: v2.6.23-rc4~55
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1807a1aaf5f2a35ea6d4b527b28bc8889d255a2f;p=pandora-kernel.git

slab: skip calling cache_free_alien() when the platform is not numa capable

Skip calling cache_free_alien() when the platform is not numa capable.
This will avoid cache misses that happen while accessing slabp (which is
per page memory reference) to get nodeid.  Instead use a global variable to
skip the call, which is mostly likely to be present in the cache.

This gives a 0.8% performance boost with the database oltp workload on a
quad-core SMP platform and by any means the number is not small :)

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

Reading git-diff-tree failed