linux-kernel - Re: x86 status was Re: -mm merge plans for 2.6.23

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Message-Id: <20070712214048.703567db.akpm@linux-foundation.org>
Date:	Thu, 12 Jul 2007 21:40:48 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrea Arcangeli <andrea@...e.de>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: x86 status was Re: -mm merge plans for 2.6.23

On Fri, 13 Jul 2007 04:23:43 +0200 (CEST) Roman Zippel <zippel@...ux-m68k.org> wrote:

> Hi,
> 
> On Wed, 11 Jul 2007, Linus Torvalds wrote:
> 
> > Sure, bugs happen, but code that everybody runs the same generally doesn't 
> > break. So a CPU scheduler doesn't worry me all that much. CPU schedulers 
> > are "easy".
> 
> A little more advance warning wouldn't have hurt though.
> The new scheduler does _a_lot_ of heavy 64 bit calculations without any 
> attempt to scale that down a little...
> One can blame me now for not having it brought up earlier, but discussions 
> with Ingo are not something I'm looking forward to. :(
> 

I brought that up a couple of weeks ago, got handwaved at and gave up.

It still isn't obvious to me that all that arith needs to be 64-bit
on 32-bit machines, or even on 64-bit.  4e9 is a big number.
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