linux-kernel - Re: [PATCH] cgroup: disallow disabled controllers on the default hierarchy

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Message-ID: <20140605135329.GB21607@htj.dyndns.org>
Date:	Thu, 5 Jun 2014 09:53:29 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] cgroup: disallow disabled controllers on the default
 hierarchy

On Thu, Jun 05, 2014 at 05:16:30PM +0800, Li Zefan wrote:
> After booting with cgroup_disable=memory, I still saw memcg files
> in the default hierarchy, and I can write to them, though it won't
> take effect.
> 
>   # dmesg
>   ...
>   Disabling memory control group subsystem
>   ...
>   # mount -t cgroup -o __DEVEL__sane_behavior xxx /cgroup
>   # ls /cgroup
>   ...
>   memory.failcnt                   memory.move_charge_at_immigrate
>   memory.force_empty               memory.numa_stat
>   memory.limit_in_bytes            memory.oom_control
>   ...
>   # cat /cgroup/memory.usage_in_bytes
>   0
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Applied to cgroup/for-3.16 w/ minor comment update.

Thanks.

-- 
tejun
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