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sched: Check the right ->nr_running in yield_task_fair() 

With CONFIG_FAIR_GROUP_SCHED, each task_group has its own cfs_rq.
Yielding to a task from another cfs_rq may be worthwhile, since
a process calling yield typically cannot use the CPU right now.

Therefor, we want to check the per-cpu nr_running, not the
cgroup local one.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110201094715.798c4f86@annuminas.surriel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rik van Riel 2011-02-01 09:47:15 -05:00 committed by Ingo Molnar
parent 6ea72f1206
commit 725e7580aa
1 changed files with 1 additions and 1 deletions
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2
kernel/sched_fair.c
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@ -1331,7 +1331,7 @@ static void yield_task_fair(struct rq *rq)
/*
* Are we the only task in the tree?
*/
if (unlikely(cfs_rq->nr_running == 1))
if (unlikely(rq->nr_running == 1))
return;
clear_buddies(cfs_rq, se);