linux-kernel - [PATCH v7 05/14] sched: Introduce a sched

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Message-Id: <20180912091309.7551-6-quentin.perret@arm.com>
Date:   Wed, 12 Sep 2018 10:13:00 +0100
From:   Quentin Perret <quentin.perret@....com>
To:     peterz@...radead.org, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, mingo@...hat.com,
        dietmar.eggemann@....com, morten.rasmussen@....com,
        chris.redpath@....com, patrick.bellasi@....com,
        valentin.schneider@....com, vincent.guittot@...aro.org,
        thara.gopinath@...aro.org, viresh.kumar@...aro.org,
        tkjos@...gle.com, joel@...lfernandes.org, smuckle@...gle.com,
        adharmap@...eaurora.org, skannan@...eaurora.org,
        pkondeti@...eaurora.org, juri.lelli@...hat.com,
        edubezval@...il.com, srinivas.pandruvada@...ux.intel.com,
        currojerez@...eup.net, javi.merino@...nel.org,
        quentin.perret@....com
Subject: [PATCH v7 05/14] sched: Introduce a sched_feat for Energy Aware Scheduling

In order to make sure Energy Aware Scheduling (EAS) doesn't hurt
systems not using it, add a new sched_feat, called ENERGY_AWARE,
guarding the access to EAS code paths.

Signed-off-by: Quentin Perret <quentin.perret@....com>
---
 kernel/sched/features.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index 85ae8488039c..26ff6752e492 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -90,3 +90,10 @@ SCHED_FEAT(WA_BIAS, true)
  * UtilEstimation. Use estimated CPU utilization.
  */
 SCHED_FEAT(UTIL_EST, true)
+
+/*
+ * Energy-Aware Scheduling. Whether or not tasks will be placed into an
+ * energy-aware fashion depends on this feature being enabled and on the
+ * root domain having an Energy Model attached.
+ */
+SCHED_FEAT(ENERGY_AWARE, false)
-- 
2.18.0