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

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Message-ID: <4EEF6532.3090201@redhat.com>
Date:	Mon, 19 Dec 2011 11:24:18 -0500
From:	Rik van Riel <riel@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Arve Hjønnevåg 
	<arve@...roid.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

On 12/19/2011 11:16 AM, KOSAKI Motohiro wrote:
> (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.

And the reason for that, I suspect, is that the "proper"
implementation changes the VM by so much that it would
never have been merged in the first place...

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