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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Date:	Wed, 17 Jun 2009 19:06:46 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com, Mel Gorman <mel@....ul.ie>,
	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 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?



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