linux-kernel - Re: [PATCH v5 00/11] per-cgroup cpu-stat

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Message-ID: <20130109144148.GH3926@htj.dyndns.org>
Date:	Wed, 9 Jan 2013 06:41:48 -0800
From:	Tejun Heo <tj@...nel.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v5 00/11] per-cgroup cpu-stat

Hello, Glauber.

On Wed, Jan 09, 2013 at 03:45:27PM +0400, Glauber Costa wrote:
> [ update: I thought I posted this already before leaving for holidays. However,
>   now that I am checking for replies, I can't find nor replies nor the original
>   mail in my boxes or archives. I am posting again for safety sake, but sorry
>   you are getting this twice by any chance ]

I think I saw the series a while back.

> This is an attempt to provide userspace with enough information to reconstruct
> per-container version of files like "/proc/stat". In particular, we are
> interested in knowing the per-cgroup slices of user time, system time, wait
> time, number of processes, and a variety of statistics.
> 
> This task is made more complicated by the fact that multiple controllers are
> involved in collecting those statistics: cpu and cpuacct. So the first thing I
> am doing here, is ressurecting Tejun's patches that aim at deprecating cpuacct.
> 
> This is one of the major differences from earlier attempts: all data is provided
> by the cpu controller, resulting in greater simplicity.
> 
> This also tries to hook into the existing scheduler hierarchy walks instead of
> providing new ones.

The cgroup part looks good to me.

Thanks.

-- 
tejun
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