linux-kernel - Re: [RFC] Extend Linux to support proportional-share scheduling

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Message-ID: <20070421042433.GE2986@holomorphy.com>
Date:	Fri, 20 Apr 2007 21:24:33 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Tong Li <tong.n.li@...el.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Extend Linux to support proportional-share scheduling

On Fri, Apr 20, 2007 at 11:30:04AM -0700, Tong Li wrote:
> This patch extends the existing Linux scheduler with support for
> proportional-share scheduling (as a new KConfig option).
> http://www.cs.duke.edu/~tongli/linux/linux-2.6.19.2-trio.patch
> It uses a scheduling algorithm, called Distributed Weighted Round-Robin 
> (DWRR), which retains the existing scheduler design as much as possible, 
> and extends it to achieve proportional fairness with O(1) time complexity 
> and a constant error bound, compared to the ideal fair scheduling 
> algorithm. The code is by no means final and has been only tested on a 
> four-processor dual-core x86-64 system. Rather than focusing on coding 
> issues, the intent of this RFC is to invite discussions on the proposed 
> DWRR algorithm and proportional-share scheduling in general.

Very nice. I think we need this kind of functionality in mainline.


-- wli
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