linux-kernel - Re: [PATCH 12/12] cgroup: implement dynamic subtree controller enable/disable on the default hierarchy

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Date:	Fri, 18 Apr 2014 16:41:08 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	lizefan@...wei.com, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/12] cgroup: implement dynamic subtree controller
 enable/disable on the default hierarchy

Hello,

On Thu, Apr 17, 2014 at 11:33:50PM +0530, Raghavendra KT wrote:
> On Tue, Apr 15, 2014 at 3:07 AM, Tejun Heo <tj@...nel.org> wrote:
> I undertsand that with the above parsing we could do
> echo "-blkio +blkio" > cgroup.subtree_control and honor last enable/disable.

Yeah, and the behavior is described in the following document.

 http://lkml.kernel.org/g/20140416145248.GD1257@htj.dyndns.org

> It confused me while testing. do you think we should return -EINVAL in
> such case?

Hmmm... I think whatever comes later wins is a pretty clear and easy
rule, no?

-- 
tejun
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