Re: [PATCH v4 3/7] cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock

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To: Roman Gushchin <guroan@xxxxxxxxx>
Subject: Re: [PATCH v4 3/7] cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Mon, 3 Dec 2018 08:17:06 -0800
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>, Dan Carpenter <dan.carpenter@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>, cgroups@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kernel-team@xxxxxx, Roman Gushchin <guro@xxxxxx>
In-reply-to: <20181130234745.6756-4-guro@fb.com>
References: <20181130234745.6756-1-guro@fb.com> <20181130234745.6756-4-guro@fb.com>
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, Nov 30, 2018 at 03:47:41PM -0800, Roman Gushchin wrote:
> +	 * nr_descendants and nr_dying_descendants are protected
> +	 * by cgroup_mutex and css_set_lock.

Can you be a bit more specific - hold both for writes, either for
reads.

Thanks.

-- 
tejun

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- Re: [PATCH v4 3/7] cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock
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References:
- [PATCH v4 0/7] freezer for cgroup v2
  - From: Roman Gushchin
- [PATCH v4 3/7] cgroup: protect cgroup->nr_(dying_)descendants by css_set_lock
  - From: Roman Gushchin

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