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 [thread overview]
Message-ID: <1578758346-507-6-git-send-email-thara.gopinath@linaro.org> (raw)
In-Reply-To: <1578758346-507-1-git-send-email-thara.gopinath@linaro.org>
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
next prev parent reply other threads:[~2020-01-11 15:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-11 15:58 [Patch v7 0/7] Introduce Thermal Pressure Thara Gopinath
2020-01-11 15:59 ` [Patch v7 1/7] sched/pelt: Add support to track thermal pressure Thara Gopinath
2020-01-11 15:59 ` [Patch v7 2/7] sched/topology: Add hook to read per cpu " Thara Gopinath
2020-01-11 15:59 ` [Patch v7 3/7] arm,arm64,drivers:Add infrastructure to store and update instantaneous " Thara Gopinath
2020-01-11 15:59 ` [Patch v7 4/7] sched/fair: Enable periodic update of average " Thara Gopinath
2020-01-11 18:27 ` kbuild test robot
2020-01-12 5:43 ` kbuild test robot
2020-01-11 15:59 ` Thara Gopinath [this message]
2020-01-11 15:59 ` [Patch v7 6/7] thermal/cpu-cooling: Update thermal pressure in case of a maximum frequency capping Thara Gopinath
2020-01-11 15:59 ` [Patch v7 7/7] sched/fair: Enable tuning of decay period Thara Gopinath
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