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

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Date:	Mon, 19 Dec 2011 14:24:53 -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

(12/19/11 1:38 PM), Naoya Horiguchi wrote:
> This flag shows that a given pages is a subpage of transparent hugepage.
> It does not care about whether it is a head page or a tail page, because
> it's clear from pfn of the target page which you should know when you read
> /proc/kpageflags.
> 
> Signed-off-by: Naoya Horiguchi<n-horiguchi@...jp.nec.com>

NAK.

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.

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