linux-kernel - Re: [PATCH v2 3/4] cgroup/cpuset: Include offline CPUs when tasks' cpumasks in top

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)