linux-kernel - Re: [PATCH v2 04/11] kmem accounting basic infrastructure

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Message-ID: <502B9E5F.2080907@parallels.com>
Date:	Wed, 15 Aug 2012 17:04:31 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<cgroups@...r.kernel.org>, <devel@...nvz.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<kamezawa.hiroyu@...fujitsu.com>, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH v2 04/11] kmem accounting basic infrastructure

On 08/15/2012 05:02 PM, Michal Hocko wrote:
> On Wed 15-08-12 16:53:40, Glauber Costa wrote:
> [...]
>>>>> This doesn't check for the hierachy so kmem_accounted might not be in 
>>>>> sync with it's parents. mem_cgroup_create (below) needs to copy
>>>>> kmem_accounted down from the parent and the above needs to check if this
>>>>> is a similar dance like mem_cgroup_oom_control_write.
>>>>>
>>>>
>>>> I don't see why we have to.
>>>>
>>>> I believe in a A/B/C hierarchy, C should be perfectly able to set a
>>>> different limit than its parents. Note that this is not a boolean.
>>>
>>> Ohh, I wasn't clear enough. I am not against setting the _limit_ I just
>>> meant that the kmem_accounted should be consistent within the hierarchy.
>>>
>>
>> If a parent of yours is accounted, you get accounted as well. This is
>> not the state in this patch, but gets added later. Isn't this enough ?
> 
> But if the parent is not accounted, you can set the children to be
> accounted, right? Or maybe this is changed later in the series? I didn't
> get to the end yet.
> 

Yes, you can. Do you see any problem with that?


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