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

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Date:	Tue, 5 May 2015 11:28:41 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	riel <riel@...hat.com>, efault@....de,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Juri Lelli <juri.lelli@....com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Alex Shi <alex.shi@...aro.org>
Subject: Re: [PATCH 0/4] scheduler-based cpu frequency scaling

On Mon, May 4, 2015 at 4:27 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> 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?

Will do. Apologies for the oversight.

Regards,
Mike

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