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

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Message-ID: <1316457343.6091.11.camel@twins>
Date:	Mon, 19 Sep 2011 20:35:43 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Glauber Costa <glommer@...allels.com>
Cc:	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 Mon, 2011-09-19 at 13:30 -0300, Glauber Costa wrote:
> For cpuusage, I am not sure this optimization is a valid one 

I was talking about cpuusage, cpuacct_charge() is called for every
ctxsw/tick.

But even for cpuacct tick stuff, wouldn't you need to sum all your child
cgroups to update the current cgroup? and that up the whole tree?
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