From: Christoph Lameter <christoph@lameter.com>
Date: Thu, 23 Jun 2005 07:10:05 +0000 (-0700)
Subject: [PATCH] Optimize sys_times for a single thread process
X-Git-Tag: v2.6.13-rc4~130^2~31
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=71a2224d7d1cefc23a1ac80bba421cc069cc3257;p=pandora-kernel.git

[PATCH] Optimize sys_times for a single thread process

Avoid taking the tasklist_lock in sys_times if the process is single
threaded.  In a NUMA system taking the tasklist_lock may cause a bouncing
cacheline if multiple independent processes continually call sys_times to
measure their performance.

Signed-off-by: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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