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

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Message-Id: <1200387478.15103.21.camel@twins>
Date:	Tue, 15 Jan 2008 09:57:58 +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 12:20 +0900, KOSAKI Motohiro wrote:
> Hi Rik
> 
> > 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.

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