linux-kernel - [tip:sched/core] sched/numa: Check sched_feat(NUMA) in migrate_improves

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Date:	Mon, 6 Jul 2015 08:39:24 -0700
From:	"tip-bot for bsegall@...gle.com" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, torvalds@...ux-foundation.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, mgorman@...e.de, tglx@...utronix.de,
	peterz@...radead.org, bsegall@...gle.com
Subject: [tip:sched/core] sched/numa: Check sched_feat(NUMA)
  in migrate_improves_locality()

Commit-ID:  c79ca895092dba6995fc78db20649ab55ce9149d
Gitweb:     http://git.kernel.org/tip/c79ca895092dba6995fc78db20649ab55ce9149d
Author:     bsegall@...gle.com <bsegall@...gle.com>
AuthorDate: Tue, 16 Jun 2015 12:18:21 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 6 Jul 2015 15:03:14 +0200

sched/numa: Check sched_feat(NUMA) in migrate_improves_locality()

migrate_improves_locality checked sched_feat(NUMA_FAVOUR_HIGHER) but not
sched_feat(NUMA), so disabling just the NUMA feature would leave it
working off of old data.

Signed-off-by: Ben Segall <bsegall@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/xm26si9rtqbm.fsf@sword-of-the-dawn.mtv.corp.google.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index d113c3b..98b2b96 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5680,8 +5680,8 @@ static bool migrate_improves_locality(struct task_struct *p, struct lb_env *env)
 	unsigned long src_faults, dst_faults;
 	int src_nid, dst_nid;
 
-	if (!sched_feat(NUMA_FAVOUR_HIGHER) || !p->numa_faults ||
-	    !(env->sd->flags & SD_NUMA)) {
+	if (!sched_feat(NUMA) || !sched_feat(NUMA_FAVOUR_HIGHER) ||
+	    !p->numa_faults || !(env->sd->flags & SD_NUMA)) {
 		return false;
 	}
 
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