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From ac91525a35e79b82a09fb1ed75ee547802f3bed1 Mon Sep 17 00:00:00 2001
From: Morten Rasmussen <morten.rasmussen@arm.com>
Date: Tue, 13 Jan 2015 13:45:51 +0000
Subject: [PATCH 46/92] sched: Make energy awareness a sched feature
This patch introduces the ENERGY_AWARE sched feature, which is
implemented using jump labels when SCHED_DEBUG is defined. It is
statically set false when SCHED_DEBUG is not defined. Hence this doesn't
allow energy awareness to be enabled without SCHED_DEBUG. This
sched_feature knob will be replaced later with a more appropriate
control knob when things have matured a bit.
ENERGY_AWARE is based on per-entity load-tracking hence FAIR_GROUP_SCHED
must be enable. This dependency isn't checked at compile time yet.
cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
(cherry picked from commit e3b80d193dad157c720ec29496104126dbfc67ce)
Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com>
---
kernel/sched/fair.c | 5 +++++
kernel/sched/features.h | 5 +++++
2 files changed, 10 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index cb283ca..fa393d9 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5291,6 +5291,11 @@ static void record_wakee(struct task_struct *p)
}
}
+static inline bool energy_aware(void)
+{
+ return sched_feat(ENERGY_AWARE);
+}
+
/*
* Detect M:N waker/wakee relationships via a switching-frequency heuristic.
*
diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index 69631fa..b634151 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -69,3 +69,8 @@
SCHED_FEAT(LB_MIN, false)
SCHED_FEAT(ATTACH_AGE_LOAD, true)
+/*
+ * Energy aware scheduling. Use platform energy model to guide scheduling
+ * decisions optimizing for energy efficiency.
+ */
+SCHED_FEAT(ENERGY_AWARE, false)
--
1.9.1
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