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

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Message-ID: <20110920172930.GA5318@linux.vnet.ibm.com>
Date:	Tue, 20 Sep 2011 22:59:30 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	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

* 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).

http://www.redhat.com/archives/libvir-list/2011-April/msg00801.html

> >  Someone that sees 
> > further could maybe help us out here? (but this is sideways to the whole 
> > discussion we're having anyway)
> 
> Would probably do to cc the cpuacct authors in this patch set ;-) I
> think it came from IBM, so I added vatsa.

- vatsa
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