From: Rik van Riel <riel@redhat.com>
Date: Tue, 1 Feb 2011 14:47:15 +0000 (-0500)
Subject: sched: Check the right ->nr_running in yield_task_fair()
X-Git-Tag: v2.6.39-rc1~509^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=725e7580aaf98e9f7b22b8ccfc640ad0c09e2b08;p=pandora-kernel.git

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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