linux-kernel - [RFCv3 PATCH 38/48] sched: Infrastructure to query if load balancing is energy-aware

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Message-Id: <1423074685-6336-39-git-send-email-morten.rasmussen@arm.com>
Date:	Wed,  4 Feb 2015 18:31:15 +0000
From:	Morten Rasmussen <morten.rasmussen@....com>
To:	peterz@...radead.org, mingo@...hat.com
Cc:	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	yuyang.du@...el.com, preeti@...ux.vnet.ibm.com,
	mturquette@...aro.org, nico@...aro.org, rjw@...ysocki.net,
	juri.lelli@....com, linux-kernel@...r.kernel.org
Subject: [RFCv3 PATCH 38/48] sched: Infrastructure to query if load balancing is energy-aware

From: Dietmar Eggemann <dietmar.eggemann@....com>

Energy-aware load balancing should only happen if the ENERGY_AWARE feature
is turned on and the sched domain on which the load balancing is performed
on contains energy data.
There is also a need during a load balance action to be able to query if we
should continue to load balance energy-aware or if we reached the tipping
point which forces us to fall back to the conventional load balancing
functionality.

cc: Ingo Molnar <mingo@...hat.com>
cc: Peter Zijlstra <peterz@...radead.org>

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
---
 kernel/sched/fair.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 0e95eb5..45c784f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5836,6 +5836,7 @@ struct lb_env {
 
 	enum fbq_type		fbq_type;
 	struct list_head	tasks;
+	bool                    use_ea;
 };
 
 /*
@@ -7348,6 +7349,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
 		.cpus		= cpus,
 		.fbq_type	= all,
 		.tasks		= LIST_HEAD_INIT(env.tasks),
+		.use_ea		= (energy_aware() && sd->groups->sge) ? true : false,
 	};
 
 	/*
-- 
1.9.1

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