linux-kernel - Re: [PATCH 1/2] Add mempressure cgroup

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Date:	Thu, 10 Jan 2013 11:18:25 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
CC:	Tejun Heo <tj@...nel.org>, David Rientjes <rientjes@...gle.com>,
	"Pekka Enberg" <penberg@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Michal Hocko <mhocko@...e.cz>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Luiz Capitulino" <lcapitulino@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>,
	"Leonid Moiseichuk" <leonid.moiseichuk@...ia.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	"Bartlomiej Zolnierkiewicz" <b.zolnierkie@...sung.com>,
	John Stultz <john.stultz@...aro.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <linaro-kernel@...ts.linaro.org>,
	<patches@...aro.org>, <kernel-team@...roid.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 1/2] Add mempressure cgroup

On 01/10/2013 02:06 AM, Anton Vorontsov wrote:
> On Wed, Jan 09, 2013 at 01:55:14PM -0800, Tejun Heo wrote:
> [...]
>>> We can use mempressure w/o memcg, and even then it can (or should :) be
>>> useful (for cpuset, for example).
>>
>> The problem is that you end with, at the very least, duplicate
>> hierarchical accounting mechanisms which overlap with each other
>> while, most likely, being slightly different.  About the same thing
>> happened with cpu and cpuacct controllers and we're now trying to
>> deprecate the latter.
> 
> Yeah. I started answering your comments about hierarchical accounting,
> looked into the memcg code, and realized that *this* is where I need the
> memcg stuff. :)
> 
> Thus yes, I guess I'll have to integrate it with memcg, or sort of.
> 

That being my point since the beginning. To generate per-memcg pressure,
you need memcg anyway. So you would have to have two different and
orthogonal mechanisms, and therefore, double account.


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