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

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Date:	Mon, 6 Jun 2011 14:40:25 +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 Mon, Jun 06, 2011 at 11:43:45AM +0100, Mel Gorman wrote:
> Maybe not full, but it has more PageReserved pages than anywhere else
> and few MIGRATE_MOVABLE blocks. MIGRATE_MOVABLE gets skipped during
> async compaction we could easily reach the end of the DMA zone quickly.

Debug data has nr_isolated_file in dma zone 1 and nr_isolated_file in
normal zone being -1.
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