linux-kernel - Re: [PATCH v7 5/6] cgroup/cpuset: Update description of cpuset.cpus.partition in cgroup-v2.rst

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Date:   Wed, 13 Oct 2021 18:11:37 -0400
From:   Waiman Long <longman@...hat.com>
To:     Michal Koutný <mkoutny@...e.com>,
        Waiman Long <llong@...hat.com>
Cc:     Tejun Heo <tj@...nel.org>, 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>,
        Frederic Weisbecker <frederic@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH v7 5/6] cgroup/cpuset: Update description of
 cpuset.cpus.partition in cgroup-v2.rst

On 10/13/21 5:45 PM, Waiman Long wrote:
>
>
>>
>> In conclusion, it'd be good to have validity conditions separate from
>> transition conditions (since hotplug transition can't be rejected) and
>> perhaps treat administrative changes from an ancestor equally as a
>> hotplug.
>
> I am trying to make the result of changing "cpuset.cpus" as close to 
> hotplug as possible but there are cases where the "cpuset.cpus" change 
> is prohibited but hotplug can still happen to remove the cpu.
>
> Hope this will help to clarify the current design.
>
BTW, the attached file is the current draft of cpuset.cpus.partition 
document.

Cheers,
Longman


View attachment "cpuset.cpus.partition.txt" of type "text/plain" (4889 bytes)