linux-kernel - [tip:sched/urgent] sched: Re-add lost cpu_allowed check to sched_fair.c::select_task_rq

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Date:	Sat, 19 Sep 2009 15:16:45 GMT
From:	tip-bot for Mike Galbraith <efault@....de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, efault@....de, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/urgent] sched: Re-add lost cpu_allowed check to sched_fair.c::select_task_rq_fair()

Commit-ID:  3f04e8cd5b24727a2500f8ab8f3de730ba47b02c
Gitweb:     http://git.kernel.org/tip/3f04e8cd5b24727a2500f8ab8f3de730ba47b02c
Author:     Mike Galbraith <efault@....de>
AuthorDate: Sat, 19 Sep 2009 16:52:35 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sat, 19 Sep 2009 17:11:31 +0200

sched: Re-add lost cpu_allowed check to sched_fair.c::select_task_rq_fair()

While doing some testing, I pinned mplayer, only to find it
following X around like a puppy. Looking at commit c88d591, I found
a cpu_allowed check that went AWOL.  I plugged it back in where it
looks like it needs to go, and now when I say "sit, stay!", mplayer
obeys again.

'c88d591 sched: Merge select_task_rq_fair() and
sched_balance_self()' accidentally dropped the check, causing
wake_affine() to pull pinned tasks - put it back.

[ v2: use a cheaper version from Peter ]

Signed-off-by: Mike Galbraith <efault@....de>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/sched_fair.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 29b35a7..566e3bb 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1339,7 +1339,8 @@ static int select_task_rq_fair(struct task_struct *p, int sd_flag, int wake_flag
 	int sync = wake_flags & WF_SYNC;
 
 	if (sd_flag & SD_BALANCE_WAKE) {
-		if (sched_feat(AFFINE_WAKEUPS))
+		if (sched_feat(AFFINE_WAKEUPS) &&
+		    cpumask_test_cpu(cpu, &p->cpus_allowed))
 			want_affine = 1;
 		new_cpu = prev_cpu;
 	}
--
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