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From: escape <escape@linux.alibaba.com>
To: Tejun Heo <tj@kernel.org>
Cc: hannes@cmpxchg.org, mkoutny@suse.com, cgroups@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/1] cgroup: replace global percpu_rwsem with signal_struct->group_rwsem when writing cgroup.procs/threads
Date: Fri, 5 Sep 2025 12:30:49 +0800	[thread overview]
Message-ID: <b0b5766d-e683-41bb-9a8c-00723478d68f@linux.alibaba.com> (raw)
In-Reply-To: <aLpdc4oDdAxvtUQT@slm.duckdns.org>



在 2025/9/5 11:48, Tejun Heo 写道:
> Hello,
>
> On Fri, Sep 05, 2025 at 11:44:53AM +0800, escape wrote:
> ...
>> To avoid the complexity of runtime changes to favordynmods, perhaps a
>> better approach would be to introduce a separate control variable,
>> configured via a kernel command line parameter such as
>> cgroup_migration_lock=[global|thread_group] to explicitly govern this
>> behavior. What do you think about this approach?
> Can't you just down_write threadgroup_rwsem when flipping the flag? Wouldn't
> that provide sufficient synchronization?
>
> Thanks.
>
You're right, it's clear and simple. I will make the changes in this way.

Thanks.

  reply	other threads:[~2025-09-05  4:30 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-03 11:11 [PATCH] " 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 [this message]
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
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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