linux-kernel - [PATCH v2 0/3] sched, arch_topology: Thermal pressure configuration cleanup

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Message-Id: <20200712165917.9168-1-valentin.schneider@arm.com>
Date:   Sun, 12 Jul 2020 17:59:14 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org
Cc:     Russell King <linux@...linux.org.uk>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>
Subject: [PATCH v2 0/3] sched, arch_topology: Thermal pressure configuration cleanup

Hi folks,

This stems from this thread [1] on the list. TL;DR: the thermal pressure config
has no helpful documentation, and figuring out if the right dependencies are in
place is not easy for a regular user. 

The current landscape also paints an odd picture: arch_set_thermal_pressure() is
hardcoded in sched/core.c, and is *not* architecture-definable, while
arch_get_thermal_pressure() is. Patch 1 is tackling this, the rest is Kconfig
stuff.

Cheers,
Valentin

[1]: https://lkml.kernel.org/r/20200603173150.GB1551@shell.armlinux.org.uk

Revisions
=========

v1 -> v2
--------

o Remove cpufreq_cooling.c weak function; use #define stub in sched/topology.h
  (Vincent)
o Hinge arm SCHED_THERMAL_PRESSURE selection on ARM_CPU_TOPOLOGY

Valentin Schneider (3):
  arch_topology, sched/core: Cleanup thermal pressure definition
  sched: Cleanup SCHED_THERMAL_PRESSURE kconfig entry
  arm, arm64: Select CONFIG_SCHED_THERMAL_PRESSURE

 arch/arm/Kconfig                  |  1 +
 arch/arm/include/asm/topology.h   |  3 ++-
 arch/arm64/Kconfig                |  1 +
 arch/arm64/include/asm/topology.h |  3 ++-
 drivers/base/arch_topology.c      | 11 +++++++++++
 include/linux/arch_topology.h     |  4 ++--
 include/linux/sched/topology.h    |  7 +++++++
 init/Kconfig                      | 15 ++++++++++++++-
 kernel/sched/core.c               | 11 -----------
 9 files changed, 40 insertions(+), 16 deletions(-)

--
2.27.0