linux-kernel - Re: [PATCH 1/1] cgroup: avoid the unnecessary list_add(dying_tasks) in cgroup

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Message-ID: <ZnMWe4dcz3M6cyAU@slm.duckdns.org>
Date: Wed, 19 Jun 2024 07:33:47 -1000
From: Tejun Heo <tj@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Zefan Li <lizefan.x@...edance.com>,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] cgroup: avoid the unnecessary list_add(dying_tasks)
 in cgroup_exit()

On Mon, Jun 17, 2024 at 04:31:52PM +0200, Oleg Nesterov wrote:
> cgroup_exit() needs to do this only if the exiting task is a leader and it
> is not the last live thread.  The patch doesn't use delay_group_leader(),
> atomic_read(signal->live) matches the code css_task_iter_advance() more.
> 
> cgroup_release() can now check list_empty(task->cg_list) before it takes
> css_set_lock and calls ss_set_skip_task_iters().
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Applied to cgroup/for-6.11.

Thanks.

-- 
tejun