Commit-ID: 36ace27e3e60d44ea69ce394b2e45386ae98d9d9
Gitweb: http://git.kernel.org/tip/36ace27e3e60d44ea69ce394b2e45386ae98d9d9
Author: Tim Blechmann <tim@xxxxxxxxxx>
AuthorDate: Tue, 24 Nov 2009 11:55:45 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 24 Nov 2009 12:18:12 +0100
sched: Optimize branch hint in pick_next_task_fair()
Branch hint profiling on my nehalem machine showed 90%
incorrect branch hints:
15728471 158903754 90 pick_next_task_fair
sched_fair.c 1555
Signed-off-by: Tim Blechmann <tim@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
LKML-Reference: <4B0BBBB1.2050100@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/sched_fair.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index f28a267..24086e7 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1704,7 +1704,7 @@ static struct task_struct *pick_next_task_fair(struct rq *rq)
struct cfs_rq *cfs_rq = &rq->cfs;
struct sched_entity *se;
- if (unlikely(!cfs_rq->nr_running))
+ if (!cfs_rq->nr_running)
return NULL;
do {
--
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