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Date: Thu, 9 Sep 2010 12:17:59 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH 08/10] vmscan: isolated_lru_pages() stop neighbour
 search if neighbour cannot be isolated
Message-Id: <20100909121759.d66fb89a.kamezawa.hiroyu@jp.fujitsu.com>
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Sender: owner-linux-mm@kvack.org
To: Mel Gorman <mel@csn.ul.ie>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Linux Kernel List <linux-kernel@vger.kernel.org>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Minchan Kim <minchan.kim@gmail.com>, Wu Fengguang <fengguang.wu@intel.com>, Andrea Arcangeli <aarcange@redhat.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Dave Chinner <david@fromorbit.com>, Chris Mason <chris.mason@oracle.com>, Christoph Hellwig <hch@lst.de>, Andrew Morton <akpm@linux-foundation.org>
List-ID: <linux-mm.kvack.org>

On Mon,  6 Sep 2010 11:47:31 +0100
Mel Gorman <mel@csn.ul.ie> wrote:

> From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> 
> isolate_lru_pages() does not just isolate LRU tail pages, but also isolate
> neighbour pages of the eviction page. The neighbour search does not stop even
> if neighbours cannot be isolated which is excessive as the lumpy reclaim will
> no longer result in a successful higher order allocation. This patch stops
> the PFN neighbour pages if an isolation fails and moves on to the next block.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> Signed-off-by: Mel Gorman <mel@csn.ul.ie>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


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