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

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Date:	Mon, 19 Dec 2011 11:16:32 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
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>,
	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
Subject: Re: Android low memory killer vs. memory pressure notifications

(12/19/11 5:39 AM), Alan Cox wrote:
>>    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.
>
> The obvious question would be why? Would fixing memcg make more sense ?

Just historical reason. Initial memcg implement by IBM was just crap. 
People need very long time to fix it.


> The only problem I see with having a user space manager is that manager
> probably has to be mlock to avoid awkward fail cases and that may in fact
> make it smaller kernel side.


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