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From: Ionela Voinescu <ionela.voinescu@arm.com>
To: mingo@redhat.com, peterz@infradead.org,
	vincent.guittot@linaro.org, catalin.marinas@arm.com,
	will@kernel.org, rjw@rjwysocki.net, viresh.kumar@linaro.org
Cc: dietmar.eggemann@arm.com, qperret@google.com,
	valentin.schneider@arm.com, linux-pm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, ionela.voinescu@arm.com
Subject: [PATCH 0/3] condition EAS enablement on FI support
Date: Thu, 24 Sep 2020 13:39:34 +0100	[thread overview]
Message-ID: <20200924123937.20938-1-ionela.voinescu@arm.com> (raw)

Given the maturity gained by cpufreq-based Frequency Invariance (FI)
support following the patches at [1], this series conditions Energy
Aware Scheduling (EAS) enablement on a frequency invariant system.

Currently, EAS can be enabled on a system without FI support, leading
to incorrect (energy-wise) task placements. As no warning is emitted,
it could take some debugging effort to track the behavior back to the
lack of FI support; this series changes that by disabling EAS
(and advertising it) when FI support is missing.

The series is structured as follows:
 - 1/3 - create function that can rebuild the scheduling and EAS'
   performance domains if EAS' initial conditions change
 - 2/3 - condition EAS enablement on FI support
 - 3/3 - arm64: rebuild scheduling and performance domains in the
         case of late, counter-driven FI initialisation.

This series is dependent on the patches at [1] and based on linux-next
20200918.

[1] Most recent version at:
https://lore.kernel.org/lkml/20200901205549.30096-1-ionela.voinescu@arm.com/

Ionela Voinescu (3):
  sched/topology,schedutil: wrap sched domains rebuild
  sched/topology: condition EAS enablement on FIE support
  arm64: rebuild sched domains on invariance status changes

 arch/arm64/include/asm/topology.h |  1 +
 arch/arm64/kernel/topology.c      | 10 ++++++++++
 include/linux/sched/topology.h    |  1 +
 kernel/sched/cpufreq_schedutil.c  |  9 +--------
 kernel/sched/topology.c           | 26 +++++++++++++++++++-------
 5 files changed, 32 insertions(+), 15 deletions(-)


base-commit: b652d2a5f2a4e93d803cc33eb57fdc41ee528500
prerequisite-patch-id: 592324cdfe0735a845d827d23f4d042b66e480ae
prerequisite-patch-id: b232a586616b573b7fc320df2dcf4783f26dc169
prerequisite-patch-id: 8a8238e55f4e522eb0ee44c1d4a083cac019959a
prerequisite-patch-id: 8edd7fc97f15c7f737339d3e07dbcd6c6d99d986
prerequisite-patch-id: b24b28cd2ec4c929b770f5dd3eeb30f839f8d6ab
-- 
2.17.1


             reply	other threads:[~2020-09-24 12:40 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-24 12:39 Ionela Voinescu [this message]
2020-09-24 12:39 ` [PATCH 1/3] sched/topology,schedutil: wrap sched domains rebuild Ionela Voinescu
2020-09-24 13:34   ` Quentin Perret
2020-09-24 16:07     ` Ionela Voinescu
2020-09-24 12:39 ` [PATCH 2/3] sched/topology: condition EAS enablement on FIE support Ionela Voinescu
2020-09-24 12:39 ` [PATCH 3/3] arm64: rebuild sched domains on invariance status changes Ionela Voinescu
2020-09-24 13:39   ` Quentin Perret
2020-09-24 16:10     ` Ionela Voinescu
2020-09-25 13:59       ` Quentin Perret
2020-09-28 11:55         ` Dietmar Eggemann
2020-09-28 14:23           ` Ionela Voinescu
2020-09-24 13:37 ` [PATCH 0/3] condition EAS enablement on FI support Quentin Perret
2020-09-24 16:08   ` Ionela Voinescu

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