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

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Message-ID: <20111219103954.354d68af@pyramind.ukuu.org.uk>
Date:	Mon, 19 Dec 2011 10:39:54 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
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
Subject: Re: Android low memory killer vs. memory pressure notifications

>   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 ?

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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