Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Thara Gopinath <thara.gopinath@linaro.org>
To:     mingo@redhat.com, peterz@infradead.org, ionela.voinescu@arm.com,
        vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
        rui.zhang@intel.com, qperret@google.com, daniel.lezcano@linaro.org,
        viresh.kumar@linaro.org
Cc:     linux-kernel@vger.kernel.org, amit.kachhap@gmail.com,
        javi.merino@kernel.org, amit.kucheria@verdurent.com
Subject: [Patch v7 5/7] sched/fair: update cpu_capacity to reflect thermal pressure
Date:   Sat, 11 Jan 2020 10:59:04 -0500
Message-Id: <1578758346-507-6-git-send-email-thara.gopinath@linaro.org>
In-Reply-To: <1578758346-507-1-git-send-email-thara.gopinath@linaro.org>
References: <1578758346-507-1-git-send-email-thara.gopinath@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

cpu_capacity initially reflects the maximum possible capacity of a cpu.
Thermal pressure on a cpu means this maximum possible capacity is
unavailable due to thermal events. This patch subtracts the average thermal
pressure for a cpu from its maximum possible capacity so that cpu_capacity
reflects the actual maximum currently available capacity.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
---

v6->v7:
	Rewrote the patch description as per Ionela's suggestion.

 kernel/sched/fair.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 311bb0b..2b1fec3 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7733,8 +7733,15 @@ static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
 	if (unlikely(irq >= max))
 		return 1;
 
+	/*
+	 * avg_rt.util avg and avg_dl.util track binary signals
+	 * (running and not running) with weights 0 and 1024 respectively.
+	 * avg_thermal.load_avg tracks thermal pressure and the weighted
+	 * average uses the actual delta max capacity(load).
+	 */
 	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