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

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Date:	Wed, 18 Jul 2007 15:27:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	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

On Wed, 2007-07-18 at 15:07 +0200, Roman Zippel wrote:
> Hi,
> 
> On Wed, 18 Jul 2007, Peter Zijlstra wrote:
> 
> > By breaking the UNIX model of nice levels. Not an option in my book.
> 
> Breaking user expectations of nice levels is?

http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html

specifically:

"3.239 Nice Value

  A number used as advice to the system to alter process scheduling.
  Numerically smaller values give a process additional preference when
  scheduling a process to run. Numerically larger values reduce the
  preference and make a process less likely to run. Typically, a process
  with a smaller nice value runs to completion more quickly than an
  equivalent process with a higher nice value. The symbol {NZERO}
  specifies the default nice value of the system."

The only expectation is that a process with a lower nice level gets more
time. Any other expectation is a bug.

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