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

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Message-ID: <4BE94935.9090200@redhat.com>
Date:	Tue, 11 May 2010 08:10:29 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] mm,migration: Avoid race between shift_arg_pages() and
 rmap_walk() during migration by not migrating temporary stacks

On 05/11/2010 04:57 AM, Mel Gorman wrote:
> Hi Andrew,
>
> This patch closes the most important race in relation to exec and
> migration. With it applied, the swapops bug is no longer triggering for
> known problem workloads. If you pick it up, it should go with the other
> mmmigration-* fixes in mm.

> This patch causes pages within the temporary stack during exec to be skipped
> by migration. It does this by marking the VMA covering the temporary stack
> with an otherwise impossible combination of VMA flags. These flags are
> cleared when the temporary stack is moved to its final location.
>
> [kamezawa.hiroyu@...fujitsu.com: Idea for having migration skip temporary stacks]
> Signed-off-by: Mel Gorman<mel@....ul.ie>
> Reviewed-by: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>

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

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