linux-kernel - Re: [PATCH v2 1/5] cputime, cpuacct: Include guest time in user time in cpuacct.stat

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Message-ID: <YTefCTq1KyRxYlxr@slm.duckdns.org>
Date:   Tue, 7 Sep 2021 07:19:05 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Andrey Ryabinin <arbn@...dex-team.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        bharata@...ux.vnet.ibm.com, boris@....io, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/5] cputime, cpuacct: Include guest time in user time
 in cpuacct.stat

On Fri, Aug 20, 2021 at 12:40:01PM +0300, Andrey Ryabinin wrote:
> cpuacct.stat in no-root cgroups shows user time without guest time
> included int it. This doesn't match with user time shown in root
> cpuacct.stat and /proc/<pid>/stat. This also affects cgroup2's cpu.stat
> in the same way.
> 
> Make account_guest_time() to add user time to cgroup's cpustat to
> fix this.
> 
> Fixes: ef12fefabf94 ("cpuacct: add per-cgroup utime/stime statistics")
> Signed-off-by: Andrey Ryabinin <arbn@...dex-team.com>
> Cc: <stable@...r.kernel.org>

The fact that this has been broken for so long, prolly from the beginning,
gives me some pause but the patches looks fine to me.

For the series,

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun