linux-kernel - Re: [PATCH v2 2/6] cgroup/cpuset: Clarify the use of invalid partition root

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Message-ID: <YNcHOe3o//pIiByh@mtj.duckdns.org>
Date:   Sat, 26 Jun 2021 06:53:45 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Shuah Khan <shuah@...nel.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Phil Auld <pauld@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH v2 2/6] cgroup/cpuset: Clarify the use of invalid
 partition root

Hello, Waiman.

On Mon, Jun 21, 2021 at 02:49:20PM -0400, Waiman Long wrote:
>  1) A partition root can't be changed to member if it has child partition
>     roots.
>  2) Removing CPUs from cpuset.cpus that causes it to become invalid is
>     not allowed.

I'm not a fan of this approach. No matter what we have to be able to handle
CPU removals which are user-iniated operations anyway, so I don't see why
we're adding a different way of handling a different set of operations. Just
handle them the same?

Thanks.

-- 
tejun