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| author | Rik van Riel <riel@redhat.com> | 2011-02-01 09:47:15 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-02-03 14:20:32 +0100 |
| commit | 725e7580aaf98e9f7b22b8ccfc640ad0c09e2b08 (patch) | |
| tree | 8717e0fce19f74509ac1dffa91be95c3ef76c1e5 /kernel/sched_fair.c | |
| parent | 6ea72f12069306b235151c5b05ac0cca7e1dedfa (diff) | |
| download | kernel_samsung_smdk4412-725e7580aaf98e9f7b22b8ccfc640ad0c09e2b08.zip kernel_samsung_smdk4412-725e7580aaf98e9f7b22b8ccfc640ad0c09e2b08.tar.gz kernel_samsung_smdk4412-725e7580aaf98e9f7b22b8ccfc640ad0c09e2b08.tar.bz2 | |
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>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | 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 55040f3..4de9905 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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); |