linux-kernel - Re: [PATCH 3/5] scheduler: cpuacct: Enable platform hooks to track cpuusage for CPU frequencies

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Message-ID: <1290512159.2072.392.camel@laptop>
Date:	Tue, 23 Nov 2010 12:35:59 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Chan <mike@...roid.com>
Cc:	Florian Mickler <florian@...kler.org>,
	John Stultz <john.stultz@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 3/5] scheduler: cpuacct: Enable platform hooks to track
 cpuusage for CPU frequencies

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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