linux-kernel - Re: [PATCH] fix count_vm_event preempt in memory compaction direct reclaim

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Date:	Wed, 5 May 2010 16:32:49 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] fix count_vm_event preempt in memory compaction direct
	reclaim

On Wed, May 05, 2010 at 05:25:31PM +0200, Andrea Arcangeli wrote:
> On Wed, May 05, 2010 at 04:14:39PM +0100, Mel Gorman wrote:
> > How about the following as an alternative to dropp migrate_prep?
> 
> Yep this is what I'd like too... btw in the comments you also mention
> IPI but I guess that's ok.

It was an oversight. I've corrected it now.

> About the cost I'm not sure but I would
> expect the cost of this to be even higher because it also has to run
> the scheduler unlike a real IPI.
> 

Fair point. I wouldn't be too sure what the relative costs are but either
way it's bad and unnecessary in the case of compaction.

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