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

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Date:	Fri, 23 Sep 2011 13:39:26 +0530
From:	Balbir Singh <bsingharora@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	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

>> Android makes heavy use of cpuacct as well. We invented it to do cpu
>> accounting independent of control
>
> But its a massive waste of time to have to iterate a double hierarchy,
> cache-miss heaven.
>

By double hierarchy you mean both cpu and cpuacct? What if they are
not mounted together?

> Or so people really have independent cgroups as well? I thought people
> just co-mount all this crap.
>

Please see
http://code.google.com/p/cgroupmgr/wiki/cgroupsForAndroid
http://stackoverflow.com/questions/6814207/android-cpuacct-usage-file

AFAIK, some versions mount cpuacct at /acct and independent of cpu cgroups

Balbir
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