tree 17518ebe86c2b701aa4a74fcac025c1793a87a87
parent 0c9e63fd38a2fb2181668a0cdd622a3c23cfd567
author Ravikiran G Thirumalai <kiran@scalex86.org> 1143111613 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1143128289 -0800

[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>