[PATCH] Avoid taking global tasklist_lock for single threadedprocess at getrusage()
commit2dd0ebcd2ab7b18a50c0810ddb45a84316e4ee2e
authorRavikiran G Thirumalai <kiran@scalex86.org>
Thu, 23 Mar 2006 11:00:13 +0000 (23 03:00 -0800)
committerLinus Torvalds <torvalds@g5.osdl.org>
Thu, 23 Mar 2006 15:38:09 +0000 (23 07:38 -0800)
tree17518ebe86c2b701aa4a74fcac025c1793a87a87
parent0c9e63fd38a2fb2181668a0cdd622a3c23cfd567
[PATCH] Avoid taking global tasklist_lock for single threadedprocess at getrusage()

Avoid taking the global tasklist_lock when possible, if a process is single
threaded during getrusage().  Any avoidance of tasklist_lock is good for
NUMA boxes (and possibly for large SMPs).  Thanks to Oleg Nesterov for
review and suggestions.

Signed-off-by: Nippun Goel <nippung@calsoftinc.com>
Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
kernel/sys.c