tree 3b3bc52e592484f008b4f1035a0d2e9e16b029f3
parent b030a4dd609e167da7f73c2d1fa5af864a0aea17
author Christoph Lameter <christoph@lameter.com> 1119510605 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1119545130 -0700

[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>