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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-12-16 08:45:31 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-16 09:46:33 +0100
commit34f28ecd0f4bdc733c681294d02d9fab5880591b (patch)
tree7869949614b6a4f2bf52f01dfaa769ebe22c8aab /kernel/sched_fair.c
parent03e89e4574a680af15f59329b061f35d9813aff4 (diff)
sched: optimize update_curr()
Impact: micro-optimization Skip the hard work when there is none. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
-rw-r--r--kernel/sched_fair.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 928cd74cff0d..5ad4440f0fc4 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -492,6 +492,8 @@ static void update_curr(struct cfs_rq *cfs_rq)
* overflow on 32 bits):
*/
delta_exec = (unsigned long)(now - curr->exec_start);
+ if (!delta_exec)
+ return;
__update_curr(cfs_rq, curr, delta_exec);
curr->exec_start = now;