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,
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 v6 5/7] sched/fair: update cpu_capacity to reflect thermal pressure
Date: Wed, 11 Dec 2019 23:11:46 -0500 [thread overview]
Message-ID: <1576123908-12105-6-git-send-email-thara.gopinath@linaro.org> (raw)
In-Reply-To: <1576123908-12105-1-git-send-email-thara.gopinath@linaro.org>
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@linaro.org>
---
kernel/sched/fair.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e12a375..4840655 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7725,8 +7725,15 @@ 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.
+ */
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
next prev parent reply other threads:[~2019-12-12 4:12 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-12 4:11 [Patch v6 0/7] Introduce Thermal Pressure Thara Gopinath
2019-12-12 4:11 ` [Patch v6 1/7] sched/pelt.c: Add support to track thermal pressure Thara Gopinath
2019-12-16 13:43 ` Peter Zijlstra
2019-12-17 12:54 ` Dietmar Eggemann
[not found] ` <CALD-y_xHS7CaZ8SU--VP5+2F5Y8cVb4sw0XuG+JUpP_jxE7yuQ@mail.gmail.com>
2020-01-09 12:24 ` Dietmar Eggemann
2019-12-23 17:56 ` Ionela Voinescu
2020-01-02 14:40 ` Thara Gopinath
2019-12-12 4:11 ` [Patch v6 2/7] sched: Add hook to read per cpu " Thara Gopinath
2019-12-16 14:35 ` Peter Zijlstra
2019-12-17 12:54 ` Dietmar Eggemann
2019-12-12 4:11 ` [Patch v6 3/7] Add infrastructure to store and update instantaneous " Thara Gopinath
2019-12-16 14:37 ` Peter Zijlstra
2019-12-17 12:54 ` Dietmar Eggemann
2019-12-23 17:50 ` Ionela Voinescu
2019-12-12 4:11 ` [Patch v6 4/7] sched/fair: Enable periodic update of average " Thara Gopinath
2019-12-16 14:39 ` Peter Zijlstra
2019-12-16 17:59 ` Quentin Perret
2019-12-17 12:57 ` Dietmar Eggemann
2019-12-27 15:22 ` Thara Gopinath
2019-12-12 4:11 ` Thara Gopinath [this message]
2019-12-17 12:54 ` [Patch v6 5/7] sched/fair: update cpu_capacity to reflect " Dietmar Eggemann
2019-12-23 17:52 ` Ionela Voinescu
2019-12-12 4:11 ` [Patch v6 6/7] thermal/cpu-cooling: Update thermal pressure in case of a maximum frequency capping Thara Gopinath
2019-12-23 17:54 ` Ionela Voinescu
2019-12-12 4:11 ` [Patch v6 7/7] sched/fair: Enable tuning of decay period Thara Gopinath
2019-12-23 17:55 ` Ionela Voinescu
2019-12-16 14:56 ` [Patch v6 0/7] Introduce Thermal Pressure Peter Zijlstra
2020-01-11 15:04 ` Thara Gopinath
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