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From:   Thara Gopinath <thara.gopinath@linaro.org>
To:     mingo@redhat.com, peterz@infradead.org, ionela.voinescu@arm.com,
        vincent.guittot@linaro.org, rui.zhang@intel.com,
        edubezval@gmail.com, qperret@google.com
Cc:     linux-kernel@vger.kernel.org, amit.kachhap@gmail.com,
        javi.merino@kernel.org, daniel.lezcano@linaro.org
Subject: [Patch v5 4/6] sched/fair: update cpu_capcity to reflect thermal pressure
Date:   Tue,  5 Nov 2019 13:49:44 -0500
Message-Id: <1572979786-20361-5-git-send-email-thara.gopinath@linaro.org>
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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.

Other signals that are deducted from cpu_capacity to reflect the actual
capacity available are rt and dl util_avg. util_avg tracks a binary signal
and uses the weights 1024 and 0. Whereas thermal pressure is tracked
using load_avg. load_avg uses the actual "delta" capacity as the weight.

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

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9fb0494..5f6c371 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7738,6 +7738,7 @@ static unsigned long scale_rt_capacity(struct sched_domain *sd, 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