Subject: Re: [patch -mm series] ia64 specific /dev/mem handlers
From: Dave Hansen <haveblue@us.ibm.com>
To: Jes Sorensen <jes@wildopensource.com>
Cc: Andrew Morton <akpm@osdl.org>, Matthew Wilcox <matthew@wil.cx>,
       linux-ia64@vger.kernel.org,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: Tue, 22 Feb 2005 16:48:44 -0800
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On Tue, 2005-02-22 at 16:38 -0500, Jes Sorensen wrote:
> >>>>> "Dave" == Dave Hansen <haveblue@us.ibm.com> writes:
> 
> Dave> I was talking with Nigel Cunningham about doing something a
> Dave> little different from the classic page flag bits when the number
> Dave> of users is restricted and performance isn't ultra-critical.
> Dave> Would something like this work for you, instead of using a real
> Dave> page->flags bit for PG_cached?
> 
> Just took a quick look at this and it looks a bit heavy for our
> use. We are only looking at a small number of pages. However I could
> imagine future cases where performance may be more critical.

If it's a quite small number (or range) of pages, perhaps a short
list_head list would suffice.  It would sure beat consuming a page flag.

-- Dave

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