linux-kernel - Re: [RFC 0/3] Pin page control subsystem

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Message-ID: <00000140787b6191-ae3f2eb1-515e-48a1-8e64-502772af4700-000000@email.amazonses.com>
Date:	Tue, 13 Aug 2013 16:21:30 +0000
From:	Christoph Lameter <cl@...two.org>
To:	Minchan Kim <minchan@...nel.org>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	k.kozlowski@...sung.com,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Mel Gorman <mgorman@...e.de>, guz.fnst@...fujitsu.com,
	Benjamin LaHaise <bcrl@...ck.org>,
	Dave Hansen <dave.hansen@...el.com>, lliubbo@...il.com,
	aquini@...hat.com, Rik van Riel <riel@...hat.com>
Subject: Re: [RFC 0/3] Pin page control subsystem

On Tue, 13 Aug 2013, Minchan Kim wrote:

> VM sometime want to migrate and/or reclaim pages for CMA, memory-hotplug,
> THP and so on but at the moment, it could handle only userspace pages
> so if above example subsystem have pinned a some page in a range VM want
> to migrate, migration is failed so above exmaple couldn't work well.

Dont we have the mmu_notifiers that could help in that case? You could get
a callback which could prepare the pages for migration?
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