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Date:   Thu, 12 Mar 2020 14:26:19 -0400
From:   Tejun Heo <>
To:     Mathieu Desnoyers <>
Cc:     Li Zefan <>, cgroups <>,
        linux-kernel <>,
        Peter Zijlstra <>,
        Ingo Molnar <>,
        Valentin Schneider <>,
        Thomas Gleixner <>
Subject: Re: [regression] cpuset: offlined CPUs removed from affinity masks


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.



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