linux-kernel - Re: Android low memory killer vs. memory pressure notifications

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Message-ID: <20111220145654.GA26881@oksana.dev.rtsoft.ru>
Date:	Tue, 20 Dec 2011 18:56:54 +0400
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Rik van Riel <riel@...hat.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: Android low memory killer vs. memory pressure notifications

On Mon, Dec 19, 2011 at 11:12:09AM -0800, David Rientjes wrote:
> On Mon, 19 Dec 2011, Michal Hocko wrote:
> 
> > page_cgroup is 16B per page and with the current Johannes' memcg
> > naturalization work (in the mmotm tree) we are down to 8B per page (we
> > got rid of lru). Kamezawa has some patches to get rid of the flags so we
> > will be down to 4B per page on 32b. Is this still too much?
> > I would be really careful about a yet another lowmem notification
> > mechanism.
> > 
> 
> There was always general interest in a low memory notification mechanism 
> even prior to memcg, see http://lwn.net/Articles/268732/ from Marcelo and 
> KOSAKI-san.  The desire is not only to avoid the metadata overhead of 
> memcg, but also to avoid cgroups entirely.

Hm, assuming that metadata is no longer an issue, why do you think avoiding
cgroups would be a good idea?

Thanks,

-- 
Anton Vorontsov
Email: cbouatmailru@...il.com
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