From: Tejun Heo <tj@kernel.org>
To: Yi Tao <escape@linux.alibaba.com>
Cc: hannes@cmpxchg.org, mkoutny@suse.com, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 2/3] cgroup: retry find task if threadgroup leader changed
Date: Tue, 9 Sep 2025 06:59:33 -1000 [thread overview]
Message-ID: <aMBc9XRGDp6ipbOK@slm.duckdns.org> (raw)
In-Reply-To: <42b7b9b12a65e7b1a8e58ce055240ad63f93bf6b.1757403652.git.escape@linux.alibaba.com>
On Tue, Sep 09, 2025 at 03:55:29PM +0800, Yi Tao wrote:
> Between obtaining the threadgroup leader via PID and acquiring the
> cgroup attach lock, the threadgroup leader may change, which could lead
> to incorrect cgroup migration. Therefore, after acquiring the cgroup
> attach lock, we check whether the threadgroup leader has changed, and if
> so, retry the operation.
>
> Signed-off-by: Yi Tao <escape@linux.alibaba.com>
This and thread group lock relocation should come before the patch which
requires it, not after.
Thanks.
--
tejun
next prev parent reply other threads:[~2025-09-09 16:59 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-03 11:11 [PATCH] cgroup: replace global percpu_rwsem with signal_struct->group_rwsem when writing cgroup.procs/threads Yi Tao
2025-09-03 13:14 ` Waiman Long
2025-09-04 1:35 ` Chen Ridong
2025-09-04 4:59 ` escape
2025-09-04 5:02 ` escape
2025-09-03 16:53 ` Tejun Heo
2025-09-03 20:03 ` Michal Koutný
2025-09-03 20:45 ` Tejun Heo
2025-09-04 1:40 ` Chen Ridong
2025-09-04 6:43 ` escape
2025-09-04 6:52 ` Tejun Heo
2025-09-04 3:15 ` escape
2025-09-04 6:38 ` escape
2025-09-04 7:28 ` Tejun Heo
2025-09-04 8:10 ` escape
2025-09-04 11:39 ` [PATCH v2 0/1] " Yi Tao
2025-09-04 11:39 ` [PATCH v2 1/1] " Yi Tao
2025-09-04 16:31 ` Tejun Heo
2025-09-05 2:16 ` escape
2025-09-05 2:27 ` Tejun Heo
2025-09-05 3:44 ` escape
2025-09-05 3:48 ` Tejun Heo
2025-09-05 4:30 ` escape
2025-09-05 2:02 ` Chen Ridong
2025-09-05 13:17 ` kernel test robot
2025-09-08 10:20 ` [PATCH v3 0/1] cgroup: replace global percpu_rwsem with per threadgroup resem when writing to cgroup.procs Yi Tao
2025-09-08 10:20 ` [PATCH v3 1/1] " Yi Tao
2025-09-08 16:05 ` Tejun Heo
2025-09-08 19:39 ` Waiman Long
2025-09-09 7:55 ` [PATCH v4 0/3] " Yi Tao
2025-09-09 7:55 ` [PATCH v4 1/3] " Yi Tao
2025-09-09 7:55 ` [PATCH v4 2/3] cgroup: retry find task if threadgroup leader changed Yi Tao
2025-09-09 16:59 ` Tejun Heo [this message]
2025-09-09 7:55 ` [PATCH v4 3/3] cgroup: refactor the cgroup_attach_lock code to make it clearer Yi Tao
2025-09-09 17:00 ` Tejun Heo
2025-09-10 6:59 ` [PATCH v5 0/3] cgroup: replace global percpu_rwsem with per threadgroup resem when writing to cgroup.procs Yi Tao
2025-09-10 6:59 ` [PATCH v5 1/3] cgroup: refactor the cgroup_attach_lock code to make it clearer Yi Tao
2025-09-10 17:26 ` Tejun Heo
2025-09-10 6:59 ` [PATCH v5 2/3] cgroup: relocate cgroup_attach_lock within cgroup_procs_write_start Yi Tao
2025-09-10 17:31 ` Tejun Heo
2025-09-11 3:22 ` Waiman Long
2025-09-10 6:59 ` [PATCH v5 3/3] cgroup: replace global percpu_rwsem with per threadgroup resem when writing to cgroup.procs Yi Tao
2025-09-10 17:47 ` Tejun Heo
2025-09-11 1:52 ` Yi Tao
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