linux-kernel - [RFC PATCH 6/7] sched/fair: update cpu_capcity to reflect thermal pressure

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Date:   Tue,  9 Oct 2018 12:25:01 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, rui.zhang@...el.com
Cc:     gregkh@...uxfoundation.org, rafael@...nel.org,
        amit.kachhap@...il.com, viresh.kumar@...aro.org,
        javi.merino@...nel.org, edubezval@...il.com,
        daniel.lezcano@...aro.org, linux-pm@...r.kernel.org,
        quentin.perret@....com, ionela.voinescu@....com,
        vincent.guittot@...aro.org
Subject: [RFC PATCH 6/7] sched/fair: update cpu_capcity to reflect thermal pressure

cpu_capacity relflects the maximum available capacity of a cpu. Thermal
pressure on a cpu means this maximum available capacity is reduced. This
patch reduces the average thermal pressure for a cpu from its maximum
available capacity so that cpu_capacity reflects the actual
available capacity.

Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
---
 kernel/sched/fair.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7deb1d0..8651e55 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7497,6 +7497,7 @@ static unsigned long scale_rt_capacity(int cpu)
 
 	used = READ_ONCE(rq->avg_rt.util_avg);
 	used += READ_ONCE(rq->avg_dl.util_avg);
+	used += READ_ONCE(rq->avg_thermal.load_avg);
 
 	if (unlikely(used >= max))
 		return 1;
-- 
2.1.4