linux-kernel - Re: [PATCH v3 2/2] sched: add throttled time stat for throttled children

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Message-ID: <ZJNqRefKRP5mxFaw@slm.duckdns.org>
Date:   Wed, 21 Jun 2023 11:23:17 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Josh Don <joshdon@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>,
        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,
        mkoutny@...e.com
Subject: Re: [PATCH v3 2/2] sched: add throttled time stat for throttled
 children

On Tue, Jun 20, 2023 at 11:32:47AM -0700, Josh Don wrote:
> We currently export the total throttled time for cgroups that are given
> a bandwidth limit. This patch extends this accounting to also account
> the total time that each children cgroup has been throttled.
> 
> This is useful to understand the degree to which children have been
> affected by the throttling control. Children which are not runnable
> during the entire throttled period, for example, will not show any
> self-throttling time during this period.
> 
> Expose this in a new interface, 'cpu.stat.local', which is similar to
> how non-hierarchical events are accounted in 'memory.events.local'.
> 
> Signed-off-by: Josh Don <joshdon@...gle.com>

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

Thanks.

-- 
tejun