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

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Message-ID: <4EEF6240.9020107@gmail.com>
Date:	Mon, 19 Dec 2011 11:11:44 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
CC:	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>,
	David Rientjes <rientjes@...gle.com>,
	Michal Hocko <mhocko@...e.cz>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: Android low memory killer vs. memory pressure notifications

> - Use memory controller cgroup (CGROUP_MEM_RES_CTLR) notifications from
>    the kernel side, plus userland "manager" that would kill applications.
>
>    The main downside of this approach is that mem_cg needs 20 bytes per
>    page (on a 32 bit machine). So on a 32 bit machine with 4K pages
>    that's approx. 0.5% of RAM, or, in other words, 5MB on a 1GB machine.
>
>    0.5% doesn't sound too bad, but 5MB does, quite a little bit. So,
>    mem_cg feels like an overkill for this simple task (see the driver at
>    the very bottom).

Kamezawa-san, Is 20bytes/page still correct now? If I remember 
correctly, you improved space efficiency of memcg.

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