linux-kernel - Re: [RFC] mmaped copy too slow?

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Message-Id: <1200388107.15103.23.camel@twins>
Date:	Tue, 15 Jan 2008 10:08:27 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] mmaped copy too slow?


On Tue, 2008-01-15 at 18:03 +0900, KOSAKI Motohiro wrote:
> Hi Peter,
> 
> > > > While being able to deal with used-once mappings in page reclaim
> > > > could be a good idea, this would require us to be able to determine
> > > > the difference between a page that was accessed once since it was
> > > > faulted in and a page that got accessed several times.
> > > 
> > > it makes sense that read ahead hit assume used-once mapping, may be.
> > > I will try it.
> > 
> > I once had a patch that made read-ahead give feedback into page reclaim,
> > but people didn't like it.
> 
> Could you please tell me your mail subject or URL?
> I hope know why people didn't like.

I think this is the last thread on the subject:

  http://lkml.org/lkml/2007/7/21/219



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