linux-kernel - [PATCH v3 19/22] sched: pull all tasks from source group

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Message-Id: <1357375071-11793-20-git-send-email-alex.shi@intel.com>
Date:	Sat,  5 Jan 2013 16:37:48 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	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, linux-kernel@...r.kernel.org,
	alex.shi@...el.com
Subject: [PATCH v3 19/22] 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 all 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 380c8cf..d43fe6a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5109,7 +5109,9 @@ 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;
 
 		/*
@@ -5213,7 +5215,8 @@ 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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