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

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Message-ID: <20070417104141.GV8915@holomorphy.com>
Date:	Tue, 17 Apr 2007 03:41:41 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Peter Williams <pwil3058@...pond.net.au>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

William Lee Irwin III wrote:
>> Comments on which directions you'd like this to go in these respects
>> would be appreciated, as I regard you as the current "project owner."

On Tue, Apr 17, 2007 at 06:00:06PM +1000, Peter Williams wrote:
> I'd do scan through LKML from about 18 months ago looking for mention of 
> runtime configurable version of plugsched.  Some students at a 
> university (in Germany, I think) posted some patches adding this feature 
> to plugsched around about then.

Excellent. I'll go hunting for that.


On Tue, Apr 17, 2007 at 06:00:06PM +1000, Peter Williams wrote:
> I never added them to plugsched proper as I knew (from previous 
> experience when the company I worked for posted patches with similar 
> functionality) that Linux would like this idea less than he did the 
> current plugsched mechanism.

Odd how the requirements ended up including that. Fickleness abounds.
If only we knew up-front what the end would be.


On Tue, Apr 17, 2007 at 06:00:06PM +1000, Peter Williams wrote:
> Unfortunately, my own cache of the relevant e-mails got overwritten 
> during a Fedora Core upgrade (I've since moved /var onto a separate 
> drive to avoid a repetition) or I would dig them out and send them to 
> you.  I'd provided with copies of the company's patches to use as a 
> guide to how to overcome the problems associated with changing 
> schedulers on a running system (a few non trivial locking issues pop up).
> Maybe if one of the students still reads LKML he will provide a pointer.

I was tempted to restart from scratch given Ingo's comments, but I
reconsidered and I'll be working with your code (and the German
students' as well). If everything has to change, so be it, but it'll
still be a derived work. It would be ignoring precedent and failure to
properly attribute if I did otherwise.


-- wli
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