linux-kernel - Re: [PATCH] mm: compaction: Abort compaction if too many pages are isolated and caller is asynchronous

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Message-ID: <20110601191529.GY19505@random.random>
Date:	Wed, 1 Jun 2011 21:15:29 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Minchan Kim <minchan.kim@...il.com>, akpm@...ux-foundation.org,
	Ury Stankevich <urykhy@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, stable@...nel.org
Subject: Re: [PATCH] mm: compaction: Abort compaction if too many pages are
 isolated and caller is asynchronous

On Wed, Jun 01, 2011 at 06:58:09PM +0100, Mel Gorman wrote:
> Umm, HIGHMEM4G implies a two-level pagetable layout so where are
> things like _PAGE_BIT_SPLITTING being set when THP is enabled?

They should be set on the pgd, pud_offset/pgd_offset will just bypass.
The splitting bit shouldn't be special about it, the present bit
should work the same.
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