linux-kernel - [PATCH 0/4] scheduler-based cpu frequency scaling

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Date:	Mon,  4 May 2015 15:10:37 -0700
From:	Michael Turquette <mturquette@...aro.org>
To:	peterz@...radead.org, mingo@...nel.org
Cc:	linux-kernel@...r.kernel.org, preeti@...ux.vnet.ibm.com,
	Morten.Rasmussen@....com, riel@...hat.com, efault@....de,
	nicolas.pitre@...aro.org, inaro-kernel@...ts.linaro.org,
	daniel.lezcano@...aro.org, patches@...aro.org,
	eas-dev@...ts.linaro.org, dietmar.eggemann@....com,
	vincent.guittot@...aro.org, amit.kucheria@...aro.org,
	juri.lelli@....com, rjw@...ysocki.net, viresh.kumar@...aro.org,
	ashwin.chaugule@...aro.org, alex.shi@...aro.org,
	Michael Turquette <mturquette@...aro.org>
Subject: [PATCH 0/4] scheduler-based cpu frequency scaling

This series implements an event-driven cpufreq governor that scales cpu
frequency as a function of cfs runqueue utilization. The intent of this RFC is
to get some discussion going about how the scheduler can become the policy
engine for selecting cpu frequency, what limitations exist and what design do
we want to take to get to a solution.

This work is a different take on the patches I posted in November:
http://lkml.kernel.org/r/<1413958051-7103-1-git-send-email-mturquette@...aro.org>

This series depends on having frequency-invariant representations for load.
This requires Vincent's recently merged cpu capacity rework patches, as well as
a new patch from Morten included here. Morten's patch will likely make an
appearance in his energy aware scheduling v4 series.

Thanks to Juri Lelli <juri.lelli@....com> for contributing to the development
of the governor.

A git branch with these patches can be pulled from here:
https://git.linaro.org/people/mike.turquette/linux.git sched-freq

Smoke testing has been done on an OMAP4 Pandaboard and an Exynos 5800
Chromebook2. Extensive benchmarking and regression testing has not yet been
done. Before sinking too much time into extensive testing I'd like to get
feedback on the general design.

Michael Turquette (3):
  sched: sched feature for cpu frequency selection
  sched: export get_cpu_usage & capacity_orig_of
  sched: cpufreq_sched_cfs: PELT-based cpu frequency scaling

Morten Rasmussen (1):
  arm: Frequency invariant scheduler load-tracking support

 arch/arm/include/asm/topology.h |   7 +
 arch/arm/kernel/smp.c           |  53 ++++++-
 arch/arm/kernel/topology.c      |  17 +++
 drivers/cpufreq/Kconfig         |  24 ++++
 include/linux/cpufreq.h         |   3 +
 kernel/sched/Makefile           |   1 +
 kernel/sched/cpufreq_cfs.c      | 311 ++++++++++++++++++++++++++++++++++++++++
 kernel/sched/fair.c             |  48 +++----
 kernel/sched/features.h         |   6 +
 kernel/sched/sched.h            |  39 +++++
 10 files changed, 475 insertions(+), 34 deletions(-)
 create mode 100644 kernel/sched/cpufreq_cfs.c

-- 
1.9.1

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