linux-kernel - Re: [PATCH v2 cgroup/for-5.8] cgroup: add cpu.stat file to root cgroup

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Message-ID: <20200528140701.GM83516@mtj.thefacebook.com>
Date:   Thu, 28 May 2020 10:07:01 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Boris Burkov <boris@....io>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com
Subject: Re: [PATCH v2 cgroup/for-5.8] cgroup: add cpu.stat file to root
 cgroup

On Wed, May 27, 2020 at 02:43:19PM -0700, Boris Burkov wrote:
> Currently, the root cgroup does not have a cpu.stat file. Add one which
> is consistent with /proc/stat to capture global cpu statistics that
> might not fall under cgroup accounting.
> 
> We haven't done this in the past because the data are already presented
> in /proc/stat and we didn't want to add overhead from collecting root
> cgroup stats when cgroups are configured, but no cgroups have been
> created.
> 
> By keeping the data consistent with /proc/stat, I think we avoid the
> first problem, while improving the usability of cgroups stats.
> We avoid the second problem by computing the contents of cpu.stat from
> existing data collected for /proc/stat anyway.
> 
> Signed-off-by: Boris Burkov <boris@....io>
> Suggested-by: Tejun Heo <tj@...nel.org>

Applied to cgroup/for-5.8.

Thanks.

-- 
tejun