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[PATCH] Optimize sys_times for a single thread process
authorChristoph Lameter <christoph@lameter.com>
Thu, 23 Jun 2005 07:10:05 +0000 (00:10 -0700)
committerLinus Torvalds <torvalds@ppc970.osdl.org>
Thu, 23 Jun 2005 16:45:30 +0000 (09:45 -0700)
commit71a2224d7d1cefc23a1ac80bba421cc069cc3257
tree3b3bc52e592484f008b4f1035a0d2e9e16b029f3tree | snapshot
parentb030a4dd609e167da7f73c2d1fa5af864a0aea17commit | diff
[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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