linux-kernel - Re: [PATCH 7/7] Compact memory directly by a process when a high-order allocation fails

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Date:	Thu, 21 Jun 2007 05:28:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org, mel@....ul.ie,
	kamezawa.hiroyu@...fujitsu.com, clameter@....com
Subject: Re: [PATCH 7/7] Compact memory directly by a process when a
 high-order allocation fails

> On Mon, 18 Jun 2007 10:30:42 +0100 (IST) Mel Gorman <mel@....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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