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Date: Fri, 28 Dec 2012 09:24:53 +0900
From: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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Subject: Re: [RFC v4 0/3] Support volatile for anonymous range
References: <1355813274-571-1-git-send-email-minchan@kernel.org> <50DA62CE.30604@jp.fujitsu.com> <20121226034600.GB2453@blaptop>
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To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michael Kerrisk <mtk.manpages@gmail.com>, Arun Sharma <asharma@fb.com>, sanjay@google.com, Paul Turner <pjt@google.com>, David Rientjes <rientjes@google.com>, John Stultz <john.stultz@linaro.org>, Christoph Lameter <cl@linux.com>, Android Kernel Team <kernel-team@android.com>, Robert Love <rlove@google.com>, Mel Gorman <mel@csn.ul.ie>, Hugh Dickins <hughd@google.com>, Dave Hansen <dave@linux.vnet.ibm.com>, Rik van Riel <riel@redhat.com>, Dave Chinner <david@fromorbit.com>, Neil Brown <neilb@suse.de>, Mike Hommey <mh@glandium.org>, Taras Glek <tglek@mozilla.com>, KOSAKI Motohiro <kosaki.motohiro@gmail.com>

(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.
>
> a??a??a? 3/4 a??a?|a??a??a??a??a??.
>

A happy new year.

Thanks,
-Kame


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