linux-kernel - Re: [PATCH 1/2] mm,migration: During fork(), wait for migration to end if migration PTE is encountered

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Message-ID: <4BD62AE3.2070302@redhat.com>
Date:	Mon, 26 Apr 2010 20:08:03 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	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>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] mm,migration: During fork(), wait for migration to
 end if migration PTE is encountered

On 04/26/2010 06:37 PM, Mel Gorman wrote:
> From: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
>
> From: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
>
> At page migration, we replace pte with migration_entry, which has
> similar format as swap_entry and replace it with real pfn at the
> end of migration. But there is a race with fork()'s copy_page_range().

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

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