linux-kernel - Re: [PATCH] cgroup: Show control files in cgroup2 root after mount

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Message-ID: <20170718210658.GF3365493@devbig577.frc2.facebook.com>
Date:   Tue, 18 Jul 2017 17:06:58 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: Show control files in cgroup2 root after mount

On Tue, Jul 18, 2017 at 04:50:10PM -0400, Tejun Heo wrote:
> Heh, I'm really confused.  If I do the same thing, I get the following
> result which makes sense as the files would be activated in
> cgroup_apply_cftypes() when the debug controller is registered during
> boot.
> 
>  # mkdir /cgroup2
>  # mount -t cgroup2 cgroup2 /cgroup2
>  # ls /cgroup2/
>  cgroup.controllers      debug.current_css_set
>  cgroup.procs            debug.current_css_set_cg_links
>  cgroup.subtree_control  debug.current_css_set_refcount
>  cgroup.threads          debug.masks
>  debug.csses             debug.taskcount
>  debug.css_links

Never mind.  I can repro after getting rid of some automatic umounts
from rc.local.  Will find out what went wrong.

Thanks!

-- 
tejun