linux-kernel - Re: How can we make page replacement smarter

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Message-ID: <46ACABBF.10406@redhat.com>
Date:	Sun, 29 Jul 2007 11:01:19 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Al Boldi <a1426z@...ab.com>, Chris Snook <csnook@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: How can we make page replacement smarter

Alan Cox wrote:
>> Files are different.  File content tends to be grouped
>> in large related chunks, both logically in the file and
>> on disk.  Generally there is a lot more file data on a
>> system than what fits in memory.
> 
> Binary paging patterns don't always look like that unfortunately although
> I suspect we might want to be weighing towards paging out R/O file mapped
> pages earlier simply because they are bigger linear chunks

A properly implemented use-once algorithm should be able
to filter out the spatial locality of reference pages from
the temporal locality of reference ones, though...

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