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

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Message-ID: <4E7CA9B1.9070903@parallels.com>
Date:	Fri, 23 Sep 2011 12:45:53 -0300
From:	Glauber Costa <glommer@...allels.com>
To:	Balbir Singh <bsingharora@...il.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.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 09/23/2011 05:09 AM, Balbir Singh wrote:
>>> 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
But then, are they using both cpuacct and cpu cgroup for an independent 
group of tasks?

The problem here is that we're gathering the same statistics 3 times 
just because we need/want to present then in a different way. This is 
really bad design.


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