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Date: Thu, 25 Mar 2010 09:35:05 -0500 (CDT)
From: Christoph Lameter <cl@linux-foundation.org>
Subject: Re: [PATCH 02/11] mm,migration: Do not try to migrate unmapped
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To: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Minchan Kim <minchan.kim@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, David Rientjes <rientjes@google.com>, Rik van Riel <riel@redhat.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org
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On Thu, 25 Mar 2010, Mel Gorman wrote:

> Christoph is opposed to removing it because of cache-hotness issues more
> so than use-after-free concerns. The refcount is needed with or without
> SLAB_DESTROY_BY_RCU.

The issue is only performance. If we can preserve the cache hotness in a
different way (or do things in a completely different manner) then its
fine.

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