linux-kernel - Re: [PATCH RFC] cpuset: Make cpusets get restored on hotplug

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Message-ID: <20200326192035.GO162390@mtj.duckdns.org>
Date:   Thu, 26 Mar 2020 15:20:35 -0400
From:   Tejun Heo <tj@...nel.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, Dmitry Shmidt <dimitrysh@...gle.com>,
        Amit Pundir <amit.pundir@...aro.org>, kernel-team@...roid.com,
        jsbarnes@...gle.com, sonnyrao@...gle.com, vpillai@...italocean.com,
        peterz@...radead.org, Guenter Roeck <groeck@...omium.org>,
        Waiman Long <longman@...hat.com>,
        Greg Kerr <kerrnel@...gle.com>, cgroups@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>
Subject: Re: [PATCH RFC] cpuset: Make cpusets get restored on hotplug

On Thu, Mar 26, 2020 at 03:16:23PM -0400, Joel Fernandes (Google) wrote:
> This deliberately changes the behavior of the per-cpuset
> cpus file to not be effected by hotplug. When a cpu is offlined,
> it will be removed from the cpuset/cpus file. When a cpu is onlined,
> if the cpuset originally requested that that cpu was part of the cpuset,
> that cpu will be restored to the cpuset. The cpus files still
> have to be hierachical, but the ranges no longer have to be out of
> the currently online cpus, just the physically present cpus.

This is already the behavior on cgroup2 and I don't think we want to
introduce this big a behavior change to cgroup1 cpuset at this point.

Thanks.

-- 
tejun