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sched: Optimize branch hint in pick_next_task_fair()

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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@klingt.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0BBBB1.2050100@klingt.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tim Blechmann 2009-11-24 11:55:45 +01:00 committed by Ingo Molnar
parent 429947248f
commit 36ace27e3e
1 changed files with 1 additions and 1 deletions
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2
kernel/sched_fair.c
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@ -1704,7 +1704,7 @@ static struct task_struct *pick_next_task_fair(struct rq *rq)
struct cfs_rq *cfs_rq = &rq->cfs; struct cfs_rq *cfs_rq = &rq->cfs;
struct sched_entity *se; struct sched_entity *se;
if (unlikely(!cfs_rq->nr_running)) if (!cfs_rq->nr_running)
return NULL; return NULL;
do { do {