linux-kernel - Re: lowmemory android driver not needed?

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Message-ID: <28c262360901140418y242586cekd1c3220c2f4336a3@mail.gmail.com>
Date:	Wed, 14 Jan 2009 21:18:32 +0900
From:	"MinChan Kim" <minchan.kim@...il.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"Pavel Machek" <pavel@...e.cz>, "Greg KH" <greg@...ah.com>,
	"Arve Hj?nnev?g" <arve@...roid.com>,
	"Brian Swetland" <swetland@...gle.com>, arve@...gle.com,
	"San Mehat" <san@...roid.com>, "Robert Love" <rlove@...gle.com>,
	linux-kernel@...r.kernel.org,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"Rik van Riel" <riel@...hat.com>
Subject: Re: lowmemory android driver not needed?

Last time,  it seems my mail is lost.
My mail is mangled by web mail(gmail) which change my mail's base encoding type.

On Wed, Jan 14, 2009 at 7:48 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
>> > Alan, does this sound like it should remain in the tree?
>>
>> Maybe our oom killer should get a new tunable, telling it how
>> aggressive it should be, instead?
>
> I was thinking that, and it would integrate better with the OLPC work
> (which IMHO is a nicer interface for some stuff)
>
> You'd want two thresholds
>
> The 'arghhhh....' point where you start killing stuff
> The 'uh oh...' point where an OLPC style low memory notifier kicks in
>
> (OLPC's model is a handle you can select/poll for 'memory getting low' so
> apps can respond to pressure by doing stuff like dumping caches)

I guess OLPC model is similar to mem_notify.
Last year, Kosaki-san made mem_notify patch series.
It may help this situation.

http://lwn.net/Articles/268732/


> The rest ought to follow naturally IFF you can find a clean efficient way
> to measure that pressure and quantify it as a number. Our default would
> be like now, the Android default might be to trigger earlier..
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-- 
Kinds regards,
MinChan Kim
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