linux-kernel - Re: [regression] cpuset: offlined CPUs removed from affinity masks

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Message-ID: <20200312182618.GE79873@mtj.duckdns.org>
Date:   Thu, 12 Mar 2020 14:26:19 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Li Zefan <lizefan@...wei.com>, cgroups <cgroups@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [regression] cpuset: offlined CPUs removed from affinity masks

Hello,

On Sat, Mar 07, 2020 at 11:06:47AM -0500, Mathieu Desnoyers wrote:
> Looking into solving this, one key issue seems to get in the way: cpuset
> appear to care about not allowing to create a cpuset which has no currently
> active CPU where to run, e.g.:
...
> Clearly, there is an intent that cpusets take the active mask into
> account to prohibit creating an empty cpuset, but nothing prevents
> cpu hotplug from creating an empty cpuset.
> 
> I wonder how to solve this inconsistency ?

Please try cpuset in cgroup2. It shouldn't have those issues.

Thanks.

-- 
tejun