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

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Message-ID: <20181203175525.GA31090@castle.DHCP.thefacebook.com>
Date:   Mon, 3 Dec 2018 17:55:32 +0000
From:   Roman Gushchin <guro@...com>
To:     Tejun Heo <tj@...nel.org>
CC:     Roman Gushchin <guroan@...il.com>, Oleg Nesterov <oleg@...hat.com>,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v4 3/7] cgroup: protect cgroup->nr_(dying_)descendants by
 css_set_lock

On Mon, Dec 03, 2018 at 08:17:06AM -0800, Tejun Heo wrote:
> 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.

Sure. Thanks!