linux-kernel - Re: [PATCH v5] cgroup: split cgroup_destroy

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Message-ID: <1cacc295-ccea-4725-913c-7c95efeec776@huaweicloud.com>
Date: Tue, 19 Aug 2025 09:56:55 +0800
From: Chen Ridong <chenridong@...weicloud.com>
To: Tejun Heo <tj@...nel.org>
Cc: hannes@...xchg.org, mkoutny@...e.com, lizefan@...wei.com,
 cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, lujialin4@...wei.com,
 chenridong@...wei.com, hdanton@...a.com, gaoyingjie@...ontech.com
Subject: Re: [PATCH v5] cgroup: split cgroup_destroy_wq into 3 workqueues



On 2025/8/19 1:08, Tejun Heo wrote:
> Hello,
> 
> On Mon, Aug 18, 2025 at 06:14:35AM +0000, Chen Ridong wrote:
> ...
>> + * Rationale for using separate workqueues:
>> + * The cgroup root free work may depend on completion of other css offline
>> + * operations. If all tasks were enqueued to a single workqueue, this could
>> + * create a deadlock scenario where:
>> + * - Free work waits for other css offline work to complete.
>> + * - But other css offline work is queued after free work in the same queue.
> 
> Can you please refer to the concrete example too?
> 
> Thanks.
> 

Sure, the comment has been updated in v6. Please let me know if you have any feedback.

-- 
Best regards,
Ridong