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Date: Fri, 22 Nov 2002 09:32:31 -0800
From: Andrew Morton <akpm@digeo.com>
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To: Ingo Oeser <ingo.oeser@informatik.tu-chemnitz.de>
CC: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [CFT][PATCH] Latest -rmap15 stuff against 2.4.20-rc2-ac2
References: <20021121225507.GH20701@stingr.net> <20021122083828.R628@nightmaster.csn.tu-chemnitz.de>
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Ingo Oeser wrote:
> 
> On Fri, Nov 22, 2002 at 01:55:07AM +0300, Paul P Komkoff Jr wrote:
> > ChangeSet@1.695.1.6, 2002-11-21 16:42:17-02:00, riel@duckman.distro.conectiva
> >   first stab at fine-tuning arjan's O(1) VM
> [...]
> >   - preferentially deactivate file cache pages, if there are many
> >     of those
> 
> You guys don't know, how much admins have dared to get this
> behavior (back).
> 
> We will make a lot of admins very happy with that.
> 

This is what /proc/sys/vm/swappiness does in 2.5, actually.  It defines
the kernel's preference for pagecache over mapped memory.

Setting it to 100 (percent) makes it treat both types of memory equally.

Setting it to zero makes the kernel very much prefer to reclaim plain
pagecache rather than mapped-into-pagetables memory.
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