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

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Message-Id: <1184389456.6632.13.camel@Homer.simpson.net>
Date:	Sat, 14 Jul 2007 07:04:16 +0200
From:	Mike Galbraith <efault@....de>
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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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, 2007-07-13 at 19:23 +0200, Roman Zippel wrote:
> Hi,
> 
> On Fri, 13 Jul 2007, Mike Galbraith wrote:
> 
> > > The new scheduler does _a_lot_ of heavy 64 bit calculations without any 
> > > attempt to scale that down a little...
> > 
> > See prio_to_weight[], prio_to_wmult[] and sysctl_sched_stat_granularity.
> > Perhaps more can be done, but "without any attempt..." isn't accurate.
> 
> Calculating these values at runtime would have been completely insane, the 
> alternative would be a crummy approximation, so using a lookup table is 
> actually a good thing. That's not the problem.

I meant see usage.

	-Mike



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