netdev - Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory Controller

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Message-ID: <4E76572B.2000904@parallels.com>
Date:	Sun, 18 Sep 2011 17:40:11 -0300
From:	Glauber Costa <glommer@...allels.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
CC:	<linux-kernel@...r.kernel.org>, <paul@...lmenage.org>,
	<lizf@...fujitsu.com>, <kamezawa.hiroyu@...fujitsu.com>,
	<ebiederm@...ssion.com>, <davem@...emloft.net>,
	<gthelen@...gle.com>, <netdev@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: Re: [PATCH v2 1/7] Basic kernel memory functionality for the Memory
 Controller

On 09/18/2011 05:39 PM, Kirill A. Shutemov wrote:
> On Sun, Sep 18, 2011 at 04:11:21PM -0300, Glauber Costa wrote:
>> On 09/18/2011 04:05 PM, Kirill A. Shutemov wrote:
>>> On Sun, Sep 18, 2011 at 12:39:12AM -0300, Glauber Costa wrote:
>>>>> Always zero in root cgroup?
>>>>
>>>> Yes, if we're not accounting, it should be zero. WARN_ON, maybe?
>>>
>>> -ENOSYS?
>>>
>> I'd personally prefer WARN_ON. It is good symmetry from userspace PoV to
>> always be able to get a value out of it. Also, it something goes wrong
>> and it is not zero for some reason, this will help us find it.
>
> What's the point to get non-relevant value?
> What about -ENOSYS + WARN_ON?
>
Well,

what about not even registering kernel memory files for !root cgroup?
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