linux-kernel - Re: [PATCH 1/9] Remove parent field in cpuacct cgroup

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Message-ID: <CAKTCnzk=i1a3DHrforcaOCBdhjv1xi=5W=eiJiZoK4BNb3wqVw@mail.gmail.com>
Date:	Thu, 22 Sep 2011 20:41:13 +0530
From:	Balbir Singh <bsingharora@...il.com>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Glauber Costa <glommer@...allels.com>,
	linux-kernel@...r.kernel.org, xemul@...allels.com,
	paul@...lmenage.org, lizf@...fujitsu.com, daniel.lezcano@...e.fr,
	mingo@...e.hu, jbottomley@...allels.com
Subject: Re: [PATCH 1/9] Remove parent field in cpuacct cgroup

On Tue, Sep 20, 2011 at 10:59 PM, Srivatsa Vaddagiri
<vatsa@...ux.vnet.ibm.com> wrote:
> * Peter Zijlstra <a.p.zijlstra@...llo.nl> [2011-09-19 20:40:53]:
>
>> > Note I was talking about cpuusage. Well, in this case, I myself fail
>> > to see the value of the whole cpuusage thing...
>
> If I recall, cpuacct was prototyped by Paul Menage (and later modified
> by Balbir) as a way to demonstrate cgroup controller ..It was one
> of those "first" cgroups controllers written to demonstrate how cgroups worked.
>
> With regard to its value, it does provide a handy interface to measure
> cpu utilization of cgroups (vs having to manually sum up task's
> utilization) and afaik libvirt makes use of it (although I
> don't think anyone reads it at "high" frequency).
>

Android makes heavy use of cpuacct as well. We invented it to do cpu
accounting independent of control

Balbir
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