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

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Message-ID: <alpine.DEB.2.00.1112191110060.19949@chino.kir.corp.google.com>
Date:	Mon, 19 Dec 2011 11:12:09 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Anton Vorontsov <anton.vorontsov@...aro.org>,
	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, 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.
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