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

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Date:	Sat, 14 Apr 2007 21:18:16 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	William Lee Irwin III <wli@...omorphy.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair
 Scheduler [CFS]

On Sat, 14 Apr 2007, William Lee Irwin III wrote:

> The two basic attacks on such large priority spaces are the near future
> vs.  far future subdivisions and subdividing the priority space into
> (most often regular) intervals. Subdividing the priority space into
> intervals is the most obvious; you simply use some O(lg(n)) priority
> queue as the bucket discipline in the "time ring," queue by the upper
> bits of the queue priority in the time ring, and by the lower bits in
> the O(lg(n)) bucket discipline.

Sure. If you really need sub-millisecond precision, you can replace the 
bucket's list_head with an rb_root. It may be not necessary though for a 
cpu scheduler (still, didn't read Ingo's code yet).


- Davide


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