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

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Date:	Mon, 19 Dec 2011 15:48:08 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	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

>> 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?



> 
> IMO, transparency in thp means that we need no manual setup to use
> it (as a contrast with hugetlbfs,) so it seems to me that exporting
> pageflag of thp does not break the design of thp.
> 
> Anyway, I should have written the purpose in the patch description.
> Thanks for the comment.
> 
> Naoya

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