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Date: Thu, 13 Apr 2006 18:33:07 -0700 (PDT)
From: Christoph Lameter <clameter@sgi.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
cc: akpm@osdl.org, hugh@veritas.com, linux-kernel@vger.kernel.org,
       lee.schermerhorn@hp.com, linux-mm@kvack.org, taka@valinux.co.jp,
       marcelo.tosatti@cyclades.com
Subject: Re: [PATCH 5/5] Swapless V2: Revise main migration logic
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On Fri, 14 Apr 2006, KAMEZAWA Hiroyuki wrote:

> For hotremove (I stops it now..), we should fix this later (if we can do).
> If new SWP_TYPE_MIGRATION swp entry can contain write protect bit,
> hotremove can avoid copy-on-write but things will be more complicated.

This is a known issue.I'd be glad if you could come up with a working 
scheme to solve this that is simple.