linux-kernel - [PATCH v10 3/7] sched: Implement update_blocked_averages() for CONFIG_FAIR_GROUP

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Date:	Wed, 15 Jul 2015 08:04:38 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	mingo@...nel.org, peterz@...radead.org,
	linux-kernel@...r.kernel.org
Cc:	pjt@...gle.com, bsegall@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	umgwanakikbuti@...il.com, len.brown@...el.com,
	rafael.j.wysocki@...el.com, arjan@...ux.intel.com,
	fengguang.wu@...el.com, Yuyang Du <yuyang.du@...el.com>
Subject: [PATCH v10 3/7] sched: Implement update_blocked_averages() for CONFIG_FAIR_GROUP_SCHED=n

The load and the util of idle cpus must be updated periodically in
order to decay the blocked part.

If CONFIG_FAIR_GROUP_SCHED is not set, the load and util of idle cpus
are not decayed and stay at the values set before becoming idle.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Reviewed-by: Yuyang Du <yuyang.du@...el.com>
---
 kernel/sched/fair.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 452c932..3e9bccf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5877,6 +5877,16 @@ static unsigned long task_h_load(struct task_struct *p)
 #else
 static inline void update_blocked_averages(int cpu)
 {
+	struct rq *rq = cpu_rq(cpu);
+	struct cfs_rq *cfs_rq = &rq->cfs;
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&rq->lock, flags);
+	update_rq_clock(rq);
+
+	update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq);
+
+	raw_spin_unlock_irqrestore(&rq->lock, flags);
 }
 
 static unsigned long task_h_load(struct task_struct *p)
-- 
2.1.4

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