From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dave Hansen <haveblue@us.ibm.com>
Date: Tue, 22 Feb 2005 19:35:38 +0000
Subject: Re: [patch -mm series] ia64 specific /dev/mem handlers
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To: Andrew Morton <akpm@osdl.org>
Cc: Matthew Wilcox <matthew@wil.cx>, jes@wildopensource.com, linux-ia64@vger.kernel.org, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

I was talking with Nigel Cunningham about doing something a little
different from the classic page flag bits when the number of users is
restricted and performance isn't ultra-critical.  Would something like
this work for you, instead of using a real page->flags bit for
PG_cached?

http://marc.theaimsgroup.com/?l=linux-kernel&m0878103926956&w=2

BTW, they're planning on using two of those dynamic flags for software
suspend, and I'll probably use at least another two in the memory
hotplug code.  

-- Dave