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

[Glauber Costa]

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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