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Date: Wed, 14 Aug 2013 09:12:37 +0900
From: Minchan Kim <minchan@kernel.org>
To: Christoph Lameter <cl@gentwo.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, k.kozlowski@samsung.com,
        Seth Jennings <sjenning@linux.vnet.ibm.com>,
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        Benjamin LaHaise <bcrl@kvack.org>, Dave Hansen <dave.hansen@intel.com>,
        lliubbo@gmail.com, aquini@redhat.com, Rik van Riel <riel@redhat.com>
Subject: Re: [RFC 0/3] Pin page control subsystem
Message-ID: <20130814001236.GC2271@bbox>
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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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