From: Christoph Lameter <clameter@sgi.com>
Date: Sat, 25 Mar 2006 11:06:45 +0000 (-0800)
Subject: [PATCH] slab: Bypass free lists for __drain_alien_cache()
X-Git-Tag: v2.6.17-rc1~852
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e00946fe2351307eb3eda7a3343530f6d2d1af2e;p=pandora-kernel.git

[PATCH] slab: Bypass free lists for __drain_alien_cache()

__drain_alien_cache() currently drains objects by freeing them to the
(remote) freelists of the original node.  However, each node also has a
shared list containing objects to be used on any processor of that node.
We can avoid a number of remote node accesses by copying the pointers to
the free objects directly into the remote shared array.

And while we are at it: Skip alien draining if the alien cache spinlock is
already taken.

Kiran reported that this is a performance benefit.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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