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

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Date:   Fri, 16 Jul 2021 17:28:58 -0400
From:   Waiman Long <llong@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Waiman Long <llong@...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

On 7/16/21 5:18 PM, Tejun Heo wrote:
> Hello,
>
> On Fri, Jul 16, 2021 at 05:12:17PM -0400, Waiman Long wrote:
>> Are you suggesting that we add a cpuset.cpus.events file that allows
>> processes to be notified if an event (e.g. hotplug) that changes a partition
>> root to invalid partition happens or when explicit change to a partition
>> root fails? Will that be enough to satisfy your requirement?
> Yeah, something like that or make the current state file generate events on
> state transitions.


Sure. I will change the patch to make cpuset.cpus.partition generates 
event when its state change. Thanks for the suggestion. It definitely 
makes it better.

Cheers,
Longman