linux-kernel - Re: [PATCH v2 -next] cgroup: remove offline draining in root destruction to avoid hung

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3f6feb92-0496-416b-bf0c-4391e0d4426d@huaweicloud.com>
Date: Sat, 16 Aug 2025 08:33:55 +0800
From: Chen Ridong <chenridong@...weicloud.com>
To: Hillf Danton <hdanton@...a.com>
Cc: Michal Koutny <mkoutny@...e.com>, tj@...nel.org, cgroups@...r.kernel.org,
 linux-kernel@...r.kernel.org, lujialin4@...wei.com, chenridong@...wei.com,
 gaoyingjie@...ontech.com
Subject: Re: [PATCH v2 -next] cgroup: remove offline draining in root
 destruction to avoid hung_tasks



On 2025/8/15 19:54, Hillf Danton wrote:
> On Fri, 15 Aug 2025 18:28:53 +0800 Chen Ridong wrote:
>>
>> To clarify, when you mentioned "cut max_active off", did you mean setting max_active of
>> cgroup_destroy_wq to 1?
>>
> 	cgroup_destroy_wq = alloc_workqueue("cgroup_destroy", 0, 0);

Thank you for the additional clarification.

While this modification is functional, I’m concerned it might spawn a significant number of cgroup
destruction tasks—most of which would contend for cgroup_mutex. Could this waste system resources?

-- 
Best regards,
Ridong