linux-kernel - Re: [PATCH v4 1/6] cgroup/cpuset: Enable event notification when partition state changes

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Message-ID: <YRQRL0M5SAKugVQ6@slm.duckdns.org>
Date:   Wed, 11 Aug 2021 08:04:31 -1000
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>,
        Frederic Weisbecker <frederic@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Michal Koutný <mkoutny@...e.com>
Subject: Re: [PATCH v4 1/6] cgroup/cpuset: Enable event notification when
 partition state changes

On Tue, Aug 10, 2021 at 11:06:02PM -0400, Waiman Long wrote:
> A valid cpuset partition can become invalid if all its CPUs are offlined
> or somehow removed. This can happen through external events without
> "cpuset.cpus.partition" being touched at all.
> 
> Users that rely on the property of a partition being present do not
> currently have a simple way to get such an event notified other than
> constant periodic polling which is both inefficient and cumbersome.
> 
> To make life easier for those users, event notification is now enabled
> for "cpuset.cpus.partition" whenever its state changes.
> 
> Suggested-by: Tejun Heo <tj@...nel.org>
> Signed-off-by: Waiman Long <longman@...hat.com>

Applied to cgroup/for-5.15.

Thanks.

-- 
tejun