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authorChristoph Lameter <christoph@lameter.com>2005-06-23 00:10:05 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 09:45:30 -0700
commit71a2224d7d1cefc23a1ac80bba421cc069cc3257 (patch)
tree3b3bc52e592484f008b4f1035a0d2e9e16b029f3 /ipc
parentb030a4dd609e167da7f73c2d1fa5af864a0aea17 (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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