linux-kernel - Re: [PATCH cgroup/for-6.20 v4 4/5] cgroup/cpuset: Don't invalidate sibling partitions on cpuset.cpus conflict

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Message-ID: <uogjuuvcu7vsazm53xztqg2tiqeeestcfxwjyopeapoi3nji3d@7dsxwvynzcah>
Date: Mon, 12 Jan 2026 16:08:30 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Waiman Long <llong@...hat.com>
Cc: Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>, 
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org, 
	cgroups@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org, 
	Sun Shaojie <sunshaojie@...inos.cn>, Chen Ridong <chenridong@...weicloud.com>, 
	Chen Ridong <chenridong@...wei.com>
Subject: Re: [PATCH cgroup/for-6.20 v4 4/5] cgroup/cpuset: Don't invalidate
 sibling partitions on cpuset.cpus conflict

On Mon, Jan 12, 2026 at 09:51:28AM -0500, Waiman Long <llong@...hat.com> wrote:
> Sorry, I might have missed this comment of yours. The
> "cpuset.cpus.exclusive" file lists all the CPUs that can be granted to its
> children as exclusive CPUs. The cgroup root is an implicit partition root
> where all its CPUs can be granted to its children whether they are online or
> offline. "cpuset.cpus.effective" OTOH ignores the offline CPUs as well as
> exclusive CPUs that have been passed down to existing descendant partition
> roots so it may differ from the implicit "cpuset.cpus.exclusive".

Howewer, there's no "cpuset.cpus" configurable nor visible on the root
cgroup. So possibly drop this hunk altogether for simplicity?


Michal

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