linux-kernel - [PATCH 0/3] condition EAS enablement on FI support

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Date:   Thu, 24 Sep 2020 13:39:34 +0100
From:   Ionela Voinescu <ionela.voinescu@....com>
To:     mingo@...hat.com, peterz@...radead.org, vincent.guittot@...aro.org,
        catalin.marinas@....com, will@...nel.org, rjw@...ysocki.net,
        viresh.kumar@...aro.org
Cc:     dietmar.eggemann@....com, qperret@...gle.com,
        valentin.schneider@....com, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ionela.voinescu@....com
Subject: [PATCH 0/3] condition EAS enablement on FI support

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