linux-kernel - Re: [PATCH RFC 0/3] Per-process power consumption measurement facility

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Date:	Fri, 5 Jul 2013 09:48:46 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Konstantin Krivyakin <k.krivyakin@...sung.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, viresh.kumar@...aro.org,
	mingo@...hat.com, Peter Zijlstra <peterz@...radead.org>
Cc:	i.zhbanov@...sung.com, e.voevodin@...sung.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/3] Per-process power consumption measurement facility

Hi Krivyakin,

Please use "./scripts/get_maintainer.pl" and send proper maintainers.

I added them.

Thank you,
Kyungmin Park

On Fri, Jul 5, 2013 at 12:17 AM, Konstantin Krivyakin
<k.krivyakin@...sung.com> wrote:
> This patchset adds per-process power consumption measurement facility.
> Power consumption is very important on mobile platforms. This code
> allows to measure consumed power in Watts*Hours. The consumed power
> for process is updated on scheduler switch and depends on current
> CPU voltage and frequency.
>
> The formula for computation is: P = C * V^2 * f, where C is a constant
> that reflects capacity of the system, V is the current voltage and
> f is the current frequency.
> (Taken from: http://en.wikipedia.org/wiki/CPU_power_dissipation).
>
> In this patchset was added implementation for Exynos platform
> to demonstrate how it works.
>
> To minimize scheduler impact for each CPU P-state the value of (V^2 *f)
> was precomputed at the time of platform initialization.
>
> And to reduce performance impact furthermore, the C constant is multiplied
> in userspace.
>
> Konstantin Krivyakin (3):
>   Add interface to receive current cpu power
>   Add power consumption counter in task_struct.
>   Update current cpu power when cpu freq change for exynos.
>
>  drivers/cpufreq/cpufreq.c            |   17 +++++++++++++++++
>  drivers/cpufreq/exynos-cpufreq.c     |    2 ++
>  drivers/cpufreq/exynos-cpufreq.h     |    1 +
>  drivers/cpufreq/exynos4x12-cpufreq.c |   19 ++++++++++++++++++-
>  include/linux/cpufreq.h              |    6 ++++++
>  include/linux/sched.h                |    2 ++
>  include/uapi/linux/taskstats.h       |    2 ++
>  kernel/fork.c                        |    1 +
>  kernel/sched/core.c                  |    8 ++++++++
>  kernel/sched/cputime.c               |   11 +++++++++++
>  kernel/tsacct.c                      |    3 +++
>  11 files changed, 71 insertions(+), 1 deletion(-)
>
> --
> 1.7.9.5
>
> --
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