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Date: Sun, 12 Jun 2022 16:55:13 -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 v11 3/8] cgroup/cpuset: Allow no-task partition to have empty cpuset.cpus.effective On Sun, Jun 12, 2022 at 10:53:53PM -0400, Waiman Long wrote: > Without this patch, cpus.effective will never be empty. It just falls back > to its parent if it becomes empty. Now with an empty cpus.effective, I am Yeah, that part is fine. > afraid that if a task is somehow moved to such a cpuset, something bad may > happen. So I add this check as a safeguard. But how would that happen? A lot of other things would break too if that were to happen. Thanks. -- tejun
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