Messages in this thread | | | Date | Fri, 8 May 2009 11:10:52 +0200 | From | Henrik Austad <> | Subject | Re: SCHED_EDF infos |
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On Fri, May 08, 2009 at 11:35:58AM +0900, GeunSik Lim wrote: > Hi Henlik,
Hi Lim,
First off, to all of you, sorry for my last, very poorly formatted email. I have now tranceded into the realms of mutt.
> [..] > I think so. > How can we approach EDF implementation like Pfair as a generic solution > for Multicore in Linux?
I am working on an implementation now, and I hope to be able to release a prototype by the end of next week. I think we can continue the discussion then based on that.
> > I'm working on SCHED_PFAIR :-) Which is a multicore, ratebased deadline > > driven global scheduling policy where I use the PD^2 rules to solve > > tie-breaks. In theory, it can reach 100% utilization on all cores > > without missing deadlines (but in practice you will only get close to > > 100% as it is not perfect).
> > [..] > > I'd suggest getting the scheduler running first, then look at those > > problems later. If you spend all your time trying to learn the > > scheduler and design in every little feature you need, you'll never > > finish in time.
> In fact, I also don't have perfect know how to solve PI in Multicore. > [...] > > deadline inversion will be a problem, in fact, whatever you chooose to > > be the 'key' for picking tasks (priority, niceness, deadlines, wind > > direction, <whatever>), you can pretty much take that and add a > > -inversion after it. :)
No, PI is going to be deadly no matter what you do.
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