linux-kernel - Re: [PATCH v4 0/5] cgroup/cpuset: Fix CLONE_INTO

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Message-ID: <168bb07f-844f-13f5-e4bd-77c2cec94046@redhat.com>
Date:   Wed, 12 Apr 2023 14:29:46 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Christian Brauner <brauner@...nel.org>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Michal Koutný <mkoutny@...e.com>,
        Giuseppe Scrivano <gscrivan@...hat.com>
Subject: Re: [PATCH v4 0/5] cgroup/cpuset: Fix CLONE_INTO_CGROUP problem &
 other issues


On 4/12/23 14:26, Tejun Heo wrote:
> On Tue, Apr 11, 2023 at 09:35:56AM -0400, Waiman Long wrote:
>>   v4:
>>    - Add missing rcu_read_lock/unlock to cpuset_cancel_fork() in patch 3.
>>    - Add patch 5 to reduce performance impact for the
>>      non-CLONE_INTO_CGROUP case.
>>
>>   v3:
>>    - Update patches 2 & 3 to put task_cs() call under rcu_read_lock().
>>
>>   v2:
>>    - Drop v1 patch 3
>>    - Add a new patch to fix an issue in cpuset_cancel_attach() and
>>      another patch to add cpuset_can_fork() and cpuset_cacnel_fork()
>>      methods.
>>
>> The first patch in this series fixes a problem in
>> cpuset_cancel_attach(). Patches 2 and 3 fixes the CLONE_INTO_CGROUP
>> problem in cpuset. Patch 4 is a minor fix. The last patch is a
>> performance optimization patch for the non-CLONE_INTO_CGROUP case.
> Applied 1-4 to cgroup/for-6.3-fixes w/ stable cc'd. Given that the fixes are
> a bit involved, the breakages have been there for quite a while and the
> cpuset code has changed quite a bit, backporting might not be trivial tho.
> Let's see how that goes.

I know stable backport won't be straight forward. I am planning to help 
in the backporting effort. Thanks for taking these into your cgroup tree.

Cheers,
Longman