linux-kernel - Re: [RFC v4 0/3] Support volatile for anonymous range

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Message-ID: <50DCE6D5.7000901@jp.fujitsu.com>
Date:	Fri, 28 Dec 2012 09:24:53 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Minchan Kim <minchan@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Arun Sharma <asharma@...com>, sanjay@...gle.com,
	Paul Turner <pjt@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	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>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Subject: Re: [RFC v4 0/3] Support volatile for anonymous range

(2012/12/26 12:46), Minchan Kim wrote:
> Hi Kame,
>
> What are you doing these holiday season? :)
> I can't believe you sit down in front of computer.
>
Honestly, my holiday starts tomorrow ;) (but until 1/5 in the next year.)

>>
>> Hm, by the way, the user need to attach pages to the process by causing page-fault
>> (as you do by memset()) before calling mvolatile() ?
>
> For effectiveness, Yes.
>

Isn't it better to make page-fault by get_user_pages() in mvolatile() ?
Calling page fault in userland seems just to increase burden of apps.

>>
>> I think your approach is interesting, anyway.
>
> Thanks for your interest, Kame.
>
> あけましておめでとう.
>

A happy new year.

Thanks,
-Kame


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