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

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Message-ID: <20181203161706.GL2509588@devbig004.ftw2.facebook.com>
Date:   Mon, 3 Dec 2018 08:17:06 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Roman Gushchin <guroan@...il.com>
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Roman Gushchin <guro@...com>
Subject: Re: [PATCH v4 3/7] cgroup: protect cgroup->nr_(dying_)descendants by
 css_set_lock

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