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

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Date:	Tue, 05 May 2015 01:27:12 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Michael Turquette <mturquette@...aro.org>
Cc:	peterz@...radead.org, mingo@...nel.org,
	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, viresh.kumar@...aro.org,
	ashwin.chaugule@...aro.org, alex.shi@...aro.org
Subject: Re: [PATCH 0/4] scheduler-based cpu frequency scaling

On Monday, May 04, 2015 03:10:37 PM Michael Turquette wrote:
> 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

Can you *please* always CC PM-related patches to linux-pm?


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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