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

[KOSAKI Motohiro]

>> - 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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