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authorTim Blechmann <tim@klingt.org>2009-11-24 05:55:45 -0500
committerIngo Molnar <mingo@elte.hu>2009-11-24 06:18:12 -0500
commit36ace27e3e60d44ea69ce394b2e45386ae98d9d9 (patch)
tree059cf2b286d14b90e6a2515e7014eff82b5c73c6 /kernel
parent429947248f814e90f416ab4f68a871ab628000c3 (diff)
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@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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched_fair.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index f28a2671a1a6..24086e7e7593 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)
1704 struct cfs_rq *cfs_rq = &rq->cfs; 1704 struct cfs_rq *cfs_rq = &rq->cfs;
1705 struct sched_entity *se; 1705 struct sched_entity *se;
1706 1706
1707 if (unlikely(!cfs_rq->nr_running)) 1707 if (!cfs_rq->nr_running)
1708 return NULL; 1708 return NULL;
1709 1709
1710 do { 1710 do {