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Date:	Wed, 28 Apr 2010 09:36:42 +0900
From:	KAMEZAWA Hiroyuki <>
To:	Andrea Arcangeli <>
Cc:	Mel Gorman <>, Linux-MM <>,
	LKML <>,
	Minchan Kim <>,
	Christoph Lameter <>,
	Rik van Riel <>,
	Andrew Morton <>
Subject: Re: [PATCH 3/3] mm,migration: Remove straggling migration PTEs when
 page tables are being moved after the VMA has already moved

On Wed, 28 Apr 2010 02:08:33 +0200
Andrea Arcangeli <> wrote:

> On Wed, Apr 28, 2010 at 09:03:02AM +0900, KAMEZAWA Hiroyuki wrote:
> > I bet calling __get_user_pages_fast() before vma_adjust() is the way to go. 
> > When page_count(page) != page_mapcount(page) +1, migration skip it.
> My proposed fix avoids to walk the pagetables once more time and to
> mangle over the page counts. Can you check it? It works but it needs
> more review.

Sure...but can we avoid temporal objrmap breakage(inconsistency) by it ?


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