linux-kernel - [PATCH 14/14] sched: force migration on buddy CPU

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Message-Id: <1366910611-20048-15-git-send-email-vincent.guittot@linaro.org>
Date:	Thu, 25 Apr 2013 19:23:30 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, peterz@...radead.org,
	mingo@...nel.org, linux@....linux.org.uk, pjt@...gle.com,
	santosh.shilimkar@...com, Morten.Rasmussen@....com,
	chander.kashyap@...aro.org, cmetcalf@...era.com,
	tony.luck@...el.com, alex.shi@...el.com, preeti@...ux.vnet.ibm.com
Cc:	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
	len.brown@...el.com, arjan@...ux.intel.com,
	amit.kucheria@...aro.org, corbet@....net, l.majewski@...sung.com,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 14/14] sched: force migration on buddy CPU

If a CPU that doesn't participate to the packing effort, has at least one
running task, it means that its group is imbalanced and the CPUs can pull this
task.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 kernel/sched/fair.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 54c1541..f87aed2 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4729,6 +4729,9 @@ static inline void update_sg_lb_stats(struct lb_env *env,
 				max_nr_running = nr_running;
 			if (min_nr_running > nr_running)
 				min_nr_running = nr_running;
+
+			if (!is_my_buddy(i, i) && nr_running > 0)
+				sgs->group_imb = 1;
 		}
 
 		sgs->group_load += load;
-- 
1.7.9.5

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