linux-kernel - Re: [External] Re: [PATCH] psi: Add PSI_CPU

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Message-ID: <2cb984f3-fb8b-df26-31a2-8a091213d87e@bytedance.com>
Date:   Tue, 9 Feb 2021 09:49:34 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, rostedt@...dmis.org,
        dietmar.eggemann@....com, linux-kernel@...r.kernel.org,
        songmuchun@...edance.com
Subject: Re: [External] Re: [PATCH] psi: Add PSI_CPU_FULL state

在 2021/2/9 上午2:18, Johannes Weiner 写道:

> On Sun, Feb 07, 2021 at 03:24:02PM +0800, Chengming Zhou wrote:
>> The FULL state doesn't exist for the CPU resource at the system level,
>> but exist at the cgroup level, means all non-idle tasks in a cgroup are
>> delayed on the CPU resource which used by others outside of the cgroup.
>>
>> Co-developed-by: Muchun Song <songmuchun@...edance.com>
>> Signed-off-by: Muchun Song <songmuchun@...edance.com>
>> Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
>
> That metric's come up in our production environment recently as well,
> it makes a lot of sense.
>
> In addition to outside competition, this also applies to downtimes
> enforced by cpu.max - another cgroup usecase that is worth mentioning
> in the changelog & code comment.

Thank you, I will add this and send patch-v2.

> Thanks