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Date:	Sat, 01 May 2010 09:02:28 -0400
From:	Rik van Riel <>
To:	Andrea Arcangeli <>
CC:	Mel Gorman <>,
	Andrew Morton <>,
	Linux-MM <>,
	LKML <>,
	Minchan Kim <>,
	KAMEZAWA Hiroyuki <>,
	Christoph Lameter <>
Subject: Re: [PATCH 2/2] mm,migration: Avoid race between shift_arg_pages()
 and rmap_walk() during migration by not migrating temporary stacks

On 05/01/2010 05:39 AM, Andrea Arcangeli wrote:

> ===
> Subject: fix race between shift_arg_pages and rmap_walk
> From: Andrea Arcangeli<>
> migrate.c requires rmap to be able to find all ptes mapping a page at
> all times, otherwise the migration entry can be instantiated, but it
> can't be removed if the second rmap_walk fails to find the page.
> And split_huge_page() will have the same requirements as migrate.c
> already has.
> Signed-off-by: Andrea Arcangeli<>

Reviewed-by: Rik van Riel <>

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