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

William Lee Irwin III
2007-04-17T10:42:12Z

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