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

[Morten Rasmussen]

From: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>

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@xxxxxxxxxx>
cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
---
 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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