linux-kernel - [PATCH v3 10/22] sched: consider runnable load average in move

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Date:	Sat,  5 Jan 2013 16:37:39 +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 10/22] sched: consider runnable load average in move_tasks

Except using runnable load average in background, move_tasks is also
the key functions in load balance. We need consider the runnable load
average in it in order to the apple to apple load comparison.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 kernel/sched/fair.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 84a6517..cab62aa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3967,6 +3967,15 @@ static unsigned long task_h_load(struct task_struct *p);
 
 static const unsigned int sched_nr_migrate_break = 32;
 
+static unsigned long task_h_load_avg(struct task_struct *p)
+{
+	u32 period = p->se.avg.runnable_avg_period;
+	if (!period)
+		return 0;
+
+	return task_h_load(p) * p->se.avg.runnable_avg_sum / period;
+}
+
 /*
  * move_tasks tries to move up to imbalance weighted load from busiest to
  * this_rq, as part of a balancing operation within domain "sd".
@@ -4002,7 +4011,7 @@ static int move_tasks(struct lb_env *env)
 		if (throttled_lb_pair(task_group(p), env->src_cpu, env->dst_cpu))
 			goto next;
 
-		load = task_h_load(p);
+		load = task_h_load_avg(p);
 
 		if (sched_feat(LB_MIN) && load < 16 && !env->sd->nr_balance_failed)
 			goto next;
-- 
1.7.12

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