linux-kernel - Re: [PATCH 5/5] extend KSM refcounts to the anon

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Message-ID: <4BFE7CFC.4060706@redhat.com>
Date:	Thu, 27 May 2010 10:09:00 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Mel Gorman <mel@....ul.ie>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>
Subject: Re: [PATCH 5/5] extend KSM refcounts to the anon_vma root

On 05/27/2010 10:02 AM, Minchan Kim wrote:

> Hmm, I can understand this point.
> Now, rmap code always depeneds on root anon_vma's lock.
> I think it doesn't depends on KSM and MIGRATION.
>
> If we don't use KSM and MIGRATION and it is compiled out,
> Can root's anon_vma disappear during rmap walking?
> who prevent it?
>
> What am I missing?

unlink_anon_vmas walks the list in the order from newest
to oldest, ie. the root always gets unlinked (and potentially
freed) last.

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