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

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Message-ID: <aKNeF68tmjLKB6dK@slm.duckdns.org>
Date: Mon, 18 Aug 2025 07:08:39 -1000
From: Tejun Heo <tj@...nel.org>
To: Chen Ridong <chenridong@...weicloud.com>
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

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.

-- 
tejun