linux-kernel - Re: [PATCH] CFS: Fix missing digit off in wmult table

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Date:	Wed, 18 Jul 2007 15:48:11 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	James Bruce <bruce@...rew.cmu.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>,
	Andrea Arcangeli <andrea@...e.de>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH] CFS: Fix missing digit off in wmult table

* Roman Zippel <zippel@...ux-m68k.org> wrote:

> > By breaking the UNIX model of nice levels. Not an option in my book.
> 
> Breaking user expectations of nice levels is?

_changing_ it is an option within reason, and we've done it a couple of 
times already in the past, and even within CFS (as Peter correctly 
observed) we've been through a couple of iterations already. And as i 
mentioned it before, the outer edge of nice levels (+19, by far the most 
commonly used nice level) was inconsistent to begin with: 3%, 5%, 9% of 
nice-0, depending on HZ. So changing that to a consistent (and 
user-requested) 1.5% is a much smaller change than you seem to make it 
out to be. CFS itself is a far larger "change of expectations" than this 
tweak to nice levels. So by your standard we could never change the 
scheduler. (which your ultimate argument might be after all =B-)

	Ingo
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