linux-kernel - Re: [PATCH 0/3] Fix malloc() stall in zone_reclaim() and bring behaviour more in line with expectations V3

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Message-ID: <20090617120342.GB28529@csn.ul.ie>
Date:	Wed, 17 Jun 2009 13:03:42 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>, riel@...hat.com,
	fengguang.wu@...el.com, linuxram@...ibm.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 0/3] Fix malloc() stall in zone_reclaim() and bring
	behaviour more in line with expectations V3

On Wed, Jun 17, 2009 at 07:06:46PM +0900, KOSAKI Motohiro wrote:
> > On Tue, 16 Jun 2009, Mel Gorman wrote:
> > 
> > > I don't have a particular workload in mind to be perfectly honest. I'm just not
> > > convinced of the wisdom of trying to unmap pages by default in zone_reclaim()
> > > just because the NUMA distances happen to be large.
> > 
> > zone reclaim = 1 is supposed to be light weight with minimal impact. The
> > intend was just to remove potentially unused pagecache pages so that node
> > local allocations can succeed again. So lets not unmap pages.
> 
> hm, At least major two zone reclaim developer disagree my patch. Thus I have to
> agree with you, because I really don't hope to ignore other developer's opnion.
> 
> So, as far as I understand, the conclusion of this thread are
>   - Drop my patch
>   - instead, implement improvement patch of (may_unmap && page_mapped()) case
>   - the documentation should be changed
>   - it's my homework(?)
> 
> Can you agree this?
> 

Yes.

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