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Date: Mon, 2 Jul 2001 15:42:07 -0300 (BRST)
From: Rik van Riel <riel@conectiva.com.br>
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To: Marco Colombo <marco@esi.it>
Cc: Daniel Phillips <phillips@bonn-fries.net>, <mike_phillips@urscorp.com>,
        <linux-kernel@vger.kernel.org>
Subject: Re: VM Requirement Document - v0.0
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On Thu, 28 Jun 2001, Marco Colombo wrote:

> I'm not sure that, in general, recent pages with only one access are
> still better eviction candidates compared to 8 hours old pages. Here
> we need either another way to detect one-shot activity (like the one
> performed by updatedb),

Fully agreed, but there is one problem with this idea.
Suppose you have a maximum of 20% of your RAM for these
"one-shot" things, now how are you going to be able to
page in an application with a working set of, say, 25%
the size of RAM ?

If you don't have any special measures, the pages from
this "new" application will always be treated as one-shot
pages and the process will never be able to be cached in
memory completely...

Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...

http://www.surriel.com/		http://distro.conectiva.com/

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