linux-kernel - Re: [RFC v2] Support volatile range for anon vma

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Date:	Wed, 31 Oct 2012 22:01:15 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	John Stultz <john.stultz@...aro.org>,
	Christoph Lameter <cl@...ux.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	Robert Love <rlove@...gle.com>, Mel Gorman <mel@....ul.ie>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>,
	Mike Hommey <mh@...ndium.org>, Taras Glek <tglek@...illa.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	sanjay@...gle.com, David Rientjes <rientjes@...gle.com>
Subject: Re: [RFC v2] Support volatile range for anon vma

>> - making zero page daemon and avoid pagesize zero fill at page fault
>> - making new vma or page flags and mark as discardable w/o swap and
>>   vmscan treat it. (like this and/or MADV_FREE)
>
> Thanks for the information.
> I realized by you I'm not first people to think of this idea.
> Rik already tried it(https://lkml.org/lkml/2007/4/17/53) by new page flag
> and even other OSes already have such good feature. And John's concept was
> already tried long time ago (https://lkml.org/lkml/2005/11/1/384)
>
> Hmm, I look over Rik's thread but couldn't find why it wasn't merged
> at that time. Anyone know it?

Dunno. and I like volatile feature than old one. but bold remark, please don't
100% trust me, I haven't review a detailed code of your patch and I don't
strictly understand it.
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