Subject: Re: [PATCH 3/5] scheduler: cpuacct: Enable platform hooks to track
 cpuusage for CPU frequencies
From: Peter Zijlstra <peterz@infradead.org>
To: Mike Chan <mike@android.com>
Cc: Florian Mickler <florian@mickler.org>,
        John Stultz <john.stultz@linaro.org>,
        lkml <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
        Stephane Eranian <eranian@google.com>
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	 <1290250104.2118.4.camel@laptop> <20101122065129.072bba06@schatten.dmk.lab>
	 <1290422639.2110.3.camel@laptop> <20101122132306.245e0bcb@schatten.dmk.lab>
	 <AANLkTike-bR-fjakyxiFbWvER=BYdDnFSegjOcdsb1qt@mail.gmail.com>
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Date: Tue, 23 Nov 2010 12:35:59 +0100
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On Mon, 2010-11-22 at 18:05 -0800, Mike Chan wrote:

> This is useful for tracking cpu power per c-group. We split each
> android application into its own c-group and track what cpu speeds and
> how long the cpu spent for each one. Peter we've actually discussed
> this before:
> http://lkml.org/lkml/2010/5/6/301
> 
> These patches were discussed with Paul Menage and Balbir Singh back in
> April, as well as on lmkl and the cpufreq mailing lists. These may or
> may not be useful for mainline, I assume anyone wanting to track power
> specific for c-groups would be interested. I'm open for different
> implementations that can help achieve cpu power tracking per-cgroup if
> this particular implementation is controversial, or if you just want
> to help make Android's kernel better.

Right, so Stephane is working on perf-cgroup bits (I saw he recently
posted another version, which I guess I ought to look at soonish).

With that it would be rather simple to use perf to track per-cgroup
power state.
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