linux-kernel - [tip:sched/core] sched/numa: Fix task_tick_fair() from disabling numa

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Date:	Tue, 6 Oct 2015 09:17:03 -0700
From:	tip-bot for Srikar Dronamraju <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	peterz@...radead.org, efault@....de, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, mingo@...nel.org,
	srikar@...ux.vnet.ibm.com, hpa@...or.com, tglx@...utronix.de,
	riel@...hat.com, mgorman@...e.de
Subject: [tip:sched/core] sched/numa: Fix task_tick_fair()
  from disabling numa_balancing

Commit-ID:  b52da86e0ad58f096710977fcda856fd84da9233
Gitweb:     http://git.kernel.org/tip/b52da86e0ad58f096710977fcda856fd84da9233
Author:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
AuthorDate: Fri, 2 Oct 2015 07:48:25 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 6 Oct 2015 17:08:21 +0200

sched/numa: Fix task_tick_fair() from disabling numa_balancing

If static branch 'sched_numa_balancing' is enabled, it should kickstart
NUMA balancing through task_tick_numa(). However the following commit:

  2a595721a1fa ("sched/numa: Convert sched_numa_balancing to a static_branch")

erroneously disables this.

Fix this anomaly by enabling task_tick_numa() when the static branch
'sched_numa_balancing' is enabled.

Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Link: http://lkml.kernel.org/r/1443752305-27413-1-git-send-email-srikar@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4df37a4..3bdc3da 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7881,7 +7881,7 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
 		entity_tick(cfs_rq, se, queued);
 	}
 
-	if (!static_branch_unlikely(&sched_numa_balancing))
+	if (static_branch_unlikely(&sched_numa_balancing))
 		task_tick_numa(rq, curr);
 }
 
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