linux-kernel - Re: [PATCH] cgroup/cpuset: Expose cpuset.cpus.isolated

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Message-ID: <ZWYZfqAtObghsqxS@slm.duckdns.org>
Date:   Tue, 28 Nov 2023 06:46:54 -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
Subject: Re: [PATCH] cgroup/cpuset: Expose cpuset.cpus.isolated

Hello,

On Mon, Nov 27, 2023 at 02:51:05PM -0500, Waiman Long wrote:
> The root-only cpuset.cpus.isolated control file shows the current set
> of isolated CPUs in isolated partitions. This control file is currently
> exposed only with the cgroup_debug boot command line option which also
> adds the ".__DEBUG__." prefix. This is actually a useful control file if
> users want to find out which CPUs are currently in an isolated state by
> the cpuset controller. Remove CFTYPE_DEBUG flag for this control file and
> make it available by default without any prefix.
> 
> The test_cpuset_prs.sh test script and the cgroup-v2.rst documentation
> file are also updated accordingly. Minor code change is also made in
> test_cpuset_prs.sh to avoid false test failure when running on debug
> kernel.

Applied to cgroup/for-6.8 but I wonder whether this would be useful in
non-root cgroups too. e.g. In a delegated partition which is namespaced,
wouldn't this be useful too?

Thanks.

-- 
tejun