linux-kernel - [RFCv7 PATCH 06/10] sched/fair: cpufreq

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Message-Id: <1456190570-4475-7-git-send-email-smuckle@linaro.org>
Date:	Mon, 22 Feb 2016 17:22:46 -0800
From:	Steve Muckle <steve.muckle@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Juri Lelli <Juri.Lelli@....com>,
	Patrick Bellasi <patrick.bellasi@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Juri Lelli <juri.lelli@....com>
Subject: [RFCv7 PATCH 06/10] sched/fair: cpufreq_sched triggers for load balancing

From: Juri Lelli <juri.lelli@....com>

As we don't trigger freq changes from {en,de}queue_task_fair() during load
balancing, we need to do explicitly so on load balancing paths.

[smuckle@...aro.org: move update_capacity_of calls so rq lock is held]

cc: Ingo Molnar <mingo@...hat.com>
cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Juri Lelli <juri.lelli@....com>
Signed-off-by: Steve Muckle <smuckle@...aro.org>
---
 kernel/sched/fair.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e7fab8f..5531513 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6107,6 +6107,10 @@ static void attach_one_task(struct rq *rq, struct task_struct *p)
 {
 	raw_spin_lock(&rq->lock);
 	attach_task(rq, p);
+	/*
+	 * We want to potentially raise target_cpu's OPP.
+	 */
+	update_capacity_of(cpu_of(rq));
 	raw_spin_unlock(&rq->lock);
 }
 
@@ -6128,6 +6132,11 @@ static void attach_tasks(struct lb_env *env)
 		attach_task(env->dst_rq, p);
 	}
 
+	/*
+	 * We want to potentially raise env.dst_cpu's OPP.
+	 */
+	update_capacity_of(env->dst_cpu);
+
 	raw_spin_unlock(&env->dst_rq->lock);
 }
 
@@ -7267,6 +7276,11 @@ more_balance:
 		 * ld_moved     - cumulative load moved across iterations
 		 */
 		cur_ld_moved = detach_tasks(&env);
+		/*
+		 * We want to potentially lower env.src_cpu's OPP.
+		 */
+		if (cur_ld_moved)
+			update_capacity_of(env.src_cpu);
 
 		/*
 		 * We've detached some tasks from busiest_rq. Every
@@ -7631,8 +7645,13 @@ static int active_load_balance_cpu_stop(void *data)
 		schedstat_inc(sd, alb_count);
 
 		p = detach_one_task(&env);
-		if (p)
+		if (p) {
 			schedstat_inc(sd, alb_pushed);
+			/*
+			 * We want to potentially lower env.src_cpu's OPP.
+			 */
+			update_capacity_of(env.src_cpu);
+		}
 		else
 			schedstat_inc(sd, alb_failed);
 	}
-- 
2.4.10