linux-kernel - Re: [PATCH 0/3] Fix migration races in rmap

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Date:	Wed, 28 Apr 2010 02:20:56 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Christoph Lameter <cl@...ux.com>, Mel Gorman <mel@....ul.ie>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/3] Fix migration races in rmap_walk() V2

On Wed, Apr 28, 2010 at 09:13:45AM +0900, KAMEZAWA Hiroyuki wrote:
> Doing some check in move_ptes() after vma_adjust() is not safe.
> IOW, when vma's information and information in page-table is incosistent...objrmap
> is broken and migartion will cause panic.
> 
> Then...I think there are 2 ways.
>   1. use seqcounter in "mm_struct" as previous patch and lock it at mremap.
> or
>   2. get_user_pages_fast() when do remap.

3 take the anon_vma->lock
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