linux-kernel - Re: [PATCH 1/2] mm,migration: Prevent rmap_walk_[anon|ksm] seeing the wrong VMA information

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Date:	Fri, 7 May 2010 14:49:37 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Lameter <cl@...ux.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 1/2] mm,migration: Prevent rmap_walk_[anon|ksm] seeing
 the wrong VMA information

On Fri, 7 May 2010 08:52:19 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Thu, 6 May 2010 10:46:21 +0100
> Mel Gorman <mel@....ul.ie> wrote:

> > 5. It added a field to mm_struct. It's the smallest of concerns though.
> > 
> > Do you think it's a better approach and should be revisited?
> > 
> > 
> 
> If everyone think seqlock is simple, I think it should be. But it seems you all are
> going ahead with anon_vma->lock approach. 
> (Basically, it's ok to me if it works. We may be able to make it better in later.)
> 
> I'll check your V7.
> 
> Thank you for answering.

plz forget about seq_counter. we may have to add "retry" path for avoiding
dead lock. If so, using anon_vma->lock in proper manner seems sane.

Thanks,
-Kame

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