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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2008-12-16 08:45:31 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-16 09:46:33 +0100 |
| commit | 34f28ecd0f4bdc733c681294d02d9fab5880591b (patch) | |
| tree | 7869949614b6a4f2bf52f01dfaa769ebe22c8aab /kernel/sched_fair.c | |
| parent | 03e89e4574a680af15f59329b061f35d9813aff4 (diff) | |
| download | lwn-34f28ecd0f4bdc733c681294d02d9fab5880591b.tar.gz lwn-34f28ecd0f4bdc733c681294d02d9fab5880591b.zip | |
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.c | 2 |
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; |