Date: Thu, 21 Jun 2007 05:28:13 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Mel Gorman <mel@csn.ul.ie>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, mel@csn.ul.ie,
       kamezawa.hiroyu@jp.fujitsu.com, clameter@sgi.com
Subject: Re: [PATCH 7/7] Compact memory directly by a process when a
 high-order allocation fails
Message-Id: <20070621052813.ac93e12e.akpm@linux-foundation.org>
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	<20070618093042.7790.30669.sendpatchset@skynet.skynet.ie>
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> On Mon, 18 Jun 2007 10:30:42 +0100 (IST) Mel Gorman <mel@csn.ul.ie> wrote:
> +
> +			/*
> +			 * It's a race if compaction frees a suitable page but
> +			 * someone else allocates it
> +			 */
> +			count_vm_event(COMPACTRACE);
> +		}

Could perhaps cause arbitrarily long starvation.  A fix would be to free
the synchronously-compacted higher-order page into somewhere which is
private to this task (a new field in task_struct would be one such place).
-
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