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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>
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@ -1331,7 +1331,7 @@ static void yield_task_fair(struct rq *rq)
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/*
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* Are we the only task in the tree?
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*/
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if (unlikely(cfs_rq->nr_running == 1))
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if (unlikely(rq->nr_running == 1))
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return;
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clear_buddies(cfs_rq, se);
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