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Message-ID: <20230320150433.v3xcl7rqsxz4x6tg@blackpad>
Date: Mon, 20 Mar 2023 16:04:33 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Waiman Long <longman@...hat.com>
Cc: Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
Johannes Weiner <hannes@...xchg.org>,
Shuah Khan <shuah@...nel.org>, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
Will Deacon <will@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH v2 3/4] cgroup/cpuset: Include offline CPUs when tasks'
cpumasks in top_cpuset are updated
On Fri, Mar 17, 2023 at 02:05:32PM -0400, Waiman Long <longman@...hat.com> wrote:
> A cpu will be in the subparts_cpus only if it has been given to the child
> partition. So when it becomes online, it will become part of the scheduling
> domain that child partition. Only the tasks in that child partition will get
> their cpumasks updated to use it, not those in the top cpuset.
Right, it's actually the difference between offlining a CPU and giving it
to a sub-partition (hence a removed child (or switched to member) before
CPU onlining). It's clear to me now.
Thanks,
Michal
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