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

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Date:	Wed, 14 Aug 2013 09:12:37 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Christoph Lameter <cl@...two.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

Hello Christoph,

On Tue, Aug 13, 2013 at 04:21:30PM +0000, Christoph Lameter wrote:
> 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?

Now I'm not familiar with mmu_notifier so please could you elaborate it
a bit for me to dive into that? 

Thanks!

> 
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-- 
Kind regards,
Minchan Kim
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