linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Message-ID: <20070417100157.GC25553@elte.hu>
Date:	Tue, 17 Apr 2007 12:01:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Nick Piggin <npiggin@...e.de>,
	Peter Williams <pwil3058@...pond.net.au>,
	Mike Galbraith <efault@....de>,
	Con Kolivas <kernel@...ivas.org>, ck list <ck@....kolivas.org>,
	Bill Huey <billh@...ppy.monkey.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]


* William Lee Irwin III <wli@...omorphy.com> wrote:

> On Tue, Apr 17, 2007 at 11:24:22AM +0200, Ingo Molnar wrote:
>
> > until now the main approach for nice levels in Linux was always: 
> > "implement your main scheduling logic for nice 0 and then look for 
> > some low-overhead method that can be glued to it that does something 
> > that behaves like nice levels". Feel free to turn that around into a 
> > more natural approach, but the algorithm should remain fairly simple 
> > i think.
> 
> Part of my insistence was because it seemed to be relatively close to 
> a one-liner, though I'm not entirely sure what particular computation 
> to use to handle the signedness of the keys. I guess I could pick some 
> particular nice semantics myself and then sweep the extant schedulers 
> to use them after getting a testcase hammered out.

i'd love to have a oneliner solution :-)

wrt. signedness: note that in v2 i have made rq_running signed, and most 
calculations (especially those related to nice) are signed values. (On 
64-bit systems this all isnt a big issue - most of the arithmetics 
gymnastics in CFS are done to keep deltas within 32 bits, so that 
divisions and multiplications are sane.)

	Ingo
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