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: <alpine.LFD.2.00.1005111009500.3711@i5.linux-foundation.org>
Date:	Tue, 11 May 2010 10:11:03 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	Andrew Morton <akpm@...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>,
	Rik van Riel <riel@...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 Tue, 11 May 2010, Mel Gorman wrote:
> 
> 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.

Ack. _Much_ better and clearer.

I'm not entirely sure we need that "maybe_stack" (if we need it, that 
would sound like a problem anyway), but I guess it can't hurt either.

		Linus
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