linux-kernel - [patch v4 15/18] sched: pull all tasks from source group

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Message-Id: <1358996820-23036-16-git-send-email-alex.shi@intel.com>
Date:	Thu, 24 Jan 2013 11:06:57 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	torvalds@...ux-foundation.org, mingo@...hat.com,
	peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, namhyung@...nel.org, efault@....de
Cc:	vincent.guittot@...aro.org, gregkh@...uxfoundation.org,
	preeti@...ux.vnet.ibm.com, viresh.kumar@...aro.org,
	linux-kernel@...r.kernel.org, alex.shi@...el.com
Subject: [patch v4 15/18] sched: pull all tasks from source group

In power balance, we hope some sched groups are fully empty to save
CPU power of them. So, we want to move any tasks from them.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 kernel/sched/fair.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 19624f4..a1ccb40 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5110,7 +5110,9 @@ static struct rq *find_busiest_queue(struct lb_env *env,
 		 * When comparing with imbalance, use weighted_cpuload()
 		 * which is not scaled with the cpu power.
 		 */
-		if (capacity && rq->nr_running == 1 && wl > env->imbalance)
+		if (rq->nr_running == 0 ||
+			(!env->power_lb && capacity &&
+				rq->nr_running == 1 && wl > env->imbalance))
 			continue;
 
 		/*
@@ -5214,7 +5216,8 @@ redo:
 
 	ld_moved = 0;
 	lb_iterations = 1;
-	if (busiest->nr_running > 1) {
+	if (busiest->nr_running > 1 ||
+		(busiest->nr_running == 1 && env.power_lb)) {
 		/*
 		 * Attempt to move tasks. If find_busiest_group has found
 		 * an imbalance but busiest->nr_running <= 1, the group is
-- 
1.7.12

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