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Date:   Mon, 8 Feb 2021 13:18:08 -0500
From:   Johannes Weiner <>
To:     Chengming Zhou <>
Subject: Re: [PATCH] psi: Add PSI_CPU_FULL state

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 <>
> Signed-off-by: Muchun Song <>
> Signed-off-by: Chengming Zhou <>

Acked-by: Johannes Weiner <>

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.


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