linux-kernel - Re: [PATCH 02/11] mm,migration: Do not try to migrate unmapped anonymous pages

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Message-Id: <20100319152103.876F.A69D9226@jp.fujitsu.com>
Date:	Fri, 19 Mar 2010 15:21:41 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 02/11] mm,migration: Do not try to migrate unmapped anonymous pages

> > then, this logic depend on SLAB_DESTROY_BY_RCU, not refcount.
> > So, I think we don't need your [1/11] patch.
> > 
> > Am I missing something?
> > 
> 
> The refcount is still needed. The anon_vma might be valid, but the
> refcount is what ensures that the anon_vma is not freed and reused.

please please why do we need both mechanism. now cristoph is very busy and I am
de fact reviewer of page migration and mempolicy code. I really hope to understand
your patch.



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