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Date:	Tue, 27 Oct 2009 15:19:05 +0000
From:	Mel Gorman <>
To:	Christoph Lameter <>
Cc:	Stephan von Krawczynski <>,
	Frans Pop <>, Jiri Kosina <>,
	Sven Geggus <>,
	Karol Lewandowski <>,
	Tobias Oetiker <>,
	"Rafael J. Wysocki" <>,
	David Miller <>,
	Reinette Chatre <>,
	Kalle Valo <>,
	David Rientjes <>,
	KOSAKI Motohiro <>,
	Mohamed Abbas <>,
	Jens Axboe <>,
	"John W. Linville" <>,
	Pekka Enberg <>,
	Bartlomiej Zolnierkiewicz <>,
	Greg Kroah-Hartman <>,
	Kernel Testers List <>,,,
	"" <>
Subject: Re: [PATCH 2/5] page allocator: Do not allow interrupts to use

On Fri, Oct 23, 2009 at 10:03:05PM -0400, Christoph Lameter wrote:
> There are now rt dependencies in the page allocator that screw things up?

The rt logic was present before.

> And an rt flag causes the page allocator to try harder meaning it adds
> latency.

The harder term in the flag is a bit misleading. The effect of ALLOC_HARDER
is that the watermark is lower for the task. i.e. a rt task is less likely
to enter direct reclaim than normal tasks so it should have less latency.

> ?

Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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