linux-kernel - Re: [RFC][PATCH 2/3] pagemap: export KPF

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Message-ID: <4EEFAA95.6070600@ah.jp.nec.com>
Date:	Mon, 19 Dec 2011 16:20:21 -0500
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
CC:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>, linux-mm@...ck.org,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 2/3] pagemap: export KPF_THP

On Mon, Dec 19, 2011 at 03:48:08PM -0500, KOSAKI Motohiro wrote:
> >> The detail of transparent hugepage are hidden by design. We hope it
> >> keep 'transparent'.
> >> Until any explain why we should expose KPF_THP, we don't agree it.
> > 
> > The reason why I want to know physical address of thp is testing.
> > I'm working on memory error recovery and writing test code to confirm
> > that memory recovery really works when an error occurs on thps.
> > There I need to locate thps on the physical memory.
> 
> I'm sorry, I simply don't understand what you say. Why do you think
> memory recovery and thp are related feature?

This is because memory error can occur on thp and then we should be
able to handle them (otherwise we can use corrupted date) and
verify that it works.
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