From: "Michal Koutný" <mkoutny-IBi9RG/b67k@public.gmane.org>
To: Waiman Long <longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Zefan Li <lizefan.x-EC8Uxl6Npydl57MIdRCFDg@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
Christian Brauner
<brauner-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Juri Lelli <juri.lelli-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Dietmar Eggemann <dietmar.eggemann-5wv7dgnIgG8@public.gmane.org>,
gscrivan-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: Re: [PATCH 3/3] cgroup/cpuset: Allow only one active attach operation per cpuset
Date: Tue, 4 Apr 2023 11:07:37 +0200 [thread overview]
Message-ID: <20230404090737.3g3uxga52bojgdu5@blackpad> (raw)
In-Reply-To: <24b67530-62ce-4f9c-7b74-d41d2ccc710e-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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Hi.
On Mon, Apr 03, 2023 at 01:41:33PM -0400, Waiman Long <longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
> This patch is actually not related to the CLONE_INTO_GROUP problem in patch
> 1. It is a generic problem when multiple users are moving threads into
> cgroup.threads of the same or different cpusets simultaneously.
I meant this:
__cgroup_procs_write
cgroup_kn_lock_live
mutex_lock(&cgroup_mutex)
and (more succintly)
cgroup_update_dfl_csses
lockdep_assert_held(&cgroup_mutex)
Even the threaded migrations should be synchronized here.
Can you please explain in more detail what's the problematic case?
> I don't believe this patch has a dependency on patch 1.
(I meant the opposite, patch 1 would depend in this 3/3. But maybe this
one isn't need.)
Michal
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next prev parent reply other threads:[~2023-04-04 9:07 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-31 14:50 [PATCH 0/3] cgroup/cpuset: Fix CLONE_INTO_CGROUP problem & other issues Waiman Long
2023-03-31 14:50 ` [PATCH 1/3] cgroup/cpuset: Make cpuset_fork() handle CLONE_INTO_CGROUP properly Waiman Long
[not found] ` <20230331145045.2251683-2-longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2023-04-03 16:55 ` Michal Koutný
2023-04-03 17:18 ` Waiman Long
[not found] ` <d9f0005c-6825-b2a0-eac3-fcbad6e32b2f-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2023-04-03 17:29 ` Waiman Long
2023-04-04 9:19 ` Michal Koutný
2023-04-04 13:52 ` Waiman Long
2023-04-04 17:26 ` Waiman Long
2023-04-06 9:45 ` Christian Brauner
2023-04-06 14:08 ` Waiman Long
2023-04-06 2:51 ` kernel test robot
[not found] ` <202304061003.e5e0dc9c-yujie.liu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2023-04-06 12:17 ` Waiman Long
[not found] ` <20230331145045.2251683-1-longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2023-03-31 14:50 ` [PATCH 2/3] cgroup/cpuset: Make cpuset_attach_task() skip subpartitions CPUs for top_cpuset Waiman Long
[not found] ` <20230331145045.2251683-3-longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2023-04-03 16:35 ` Michal Koutný
2023-03-31 14:50 ` [PATCH 3/3] cgroup/cpuset: Allow only one active attach operation per cpuset Waiman Long
[not found] ` <20230331145045.2251683-4-longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2023-04-03 16:47 ` Michal Koutný
2023-04-03 17:41 ` Waiman Long
[not found] ` <24b67530-62ce-4f9c-7b74-d41d2ccc710e-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2023-04-04 9:07 ` Michal Koutný [this message]
2023-04-04 14:12 ` Waiman Long
2023-04-06 9:44 ` Christian Brauner
2023-04-07 15:30 ` Waiman Long
[not found] ` <89853ab9-7759-11bf-f751-28ce81a4f02e-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2023-04-09 11:46 ` Christian Brauner
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