linux-kernel - Re: [PATCH 2/2] mm,migration: Avoid race between shift_arg_pages() and rmap_walk() during migration by not migrating temporary stacks

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Message-ID: <4BDC2664.40504@redhat.com>
Date:	Sat, 01 May 2010 09:02:28 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>
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<aarcange@...hat.com>
>
> 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<aarcange@...hat.com>

Reviewed-by: Rik van Riel <riel@...hat.com>

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