linux-kernel - Re: [PATCH v2 2/2] sched: add throttled time stat for throttled children

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Date:   Mon, 19 Jun 2023 19:53:11 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Josh Don <joshdon@...gle.com>
Cc:     Tejun Heo <tj@...nel.org>, 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>,
        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>,
        Valentin Schneider <vschneid@...hat.com>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xiangling Kong <xiangling@...gle.com>
Subject: Re: [PATCH v2 2/2] sched: add throttled time stat for throttled
 children

On Mon, Jun 12, 2023 at 04:27:48PM -0700, Josh Don <joshdon@...gle.com> wrote:
> We currently export the total throttled time for cgroups that are given
> a bandwidth limit.

I assume you refer to cpu.stat:throttled_usec (from struct
cfs_bandwidth) -- notice that the value is not properly hierarchical
despite v2 filename.

> This patch extends this accounting to also account the total time that
> each children cgroup has been throttled.

IIUC, this is visible on inner-nodes cpu cgroups (i.e. with no tasks)?

IOW, wouldn't you get the intended information if hierarchical summing
was added/fixed for cpu.stat:throttled_usec?

Thanks,
Michal

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