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Subject: Re: [PATCH] CFS: Fix missing digit off in wmult table
From: Peter Zijlstra <peterz@infradead.org>
To: Roman Zippel <zippel@linux-m68k.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
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Date: Wed, 18 Jul 2007 15:27:46 +0200
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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.