linux-kernel - Re: RFC: CONFIG_PAGE_SHIFT (aka software PAGE

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Message-ID: <20070713010634.GM28613@v2.random>
Date:	Fri, 13 Jul 2007 03:06:34 +0200
From:	Andrea Arcangeli <andrea@...e.de>
To:	Matt Mackall <mpm@...enic.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: RFC: CONFIG_PAGE_SHIFT (aka software PAGE_SIZE)

On Thu, Jul 12, 2007 at 12:53:09PM -0500, Matt Mackall wrote:
> On Sat, Jul 07, 2007 at 12:26:51AM +0200, Andrea Arcangeli wrote:
> > The original idea of having a software page size larger than a
> > hardware page size, originated at SUSE by myself and Andi Kleen while
> > helping AMD to design their amd64 cpu,
> 
> Original? This was done on VAXen and in Mach ages ago.

I know nothing about that ancient stuff, but I've to trust you on
this.

> On Linux, there've already been two implementations, one by Hugh
> Dickens and an expanded version by Bill Irwin (presented at OLS in
> 2003).
> 
> Bill's patch was notable for going to heroic efforts to maintain
> binary compatibility, basically separating the userspace notion of the
> ABI's page size from the kernel's. How's your version fair here?

The events I referred to happened well before Bill's effort.

I admit I also started having some doubt about the correctness of my
above statement when I read Hugh's patch dated Jul 2001 in the last
few days, I'm now uncertain when Hugh's effort started, probably many
months before he published his code.

Overall I definitely shooted myself in the foot ;), because 1) I don't
actually care that much about the attribution of the idea (I wrote it
only as a side note), 2) we're in open source intellectual property
destruction land anyway so it doesn't matter who had the
idea. Apologies.

The way I felt while writing that side note, was that the time has
come to do what we had planned a long time ago, I simply didn't care
too much if VAXen or other ancient OS had it working before, sorry.
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