Messages in this thread | | | From | Con Kolivas <> | Subject | Re: [PATCH] 2.6.0 batch scheduling, HT aware | Date | Tue, 23 Dec 2003 13:42:56 +1100 |
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On Tue, 23 Dec 2003 12:36, Nick Piggin wrote: > Con Kolivas wrote: > >On Tue, 23 Dec 2003 12:11, Nick Piggin wrote: > >>I think this patch is much too ugly to get into such an elegant > >> scheduler. No fault to you Con because its an ugly problem. > > > >You're too kind. No it's ugly because of my code but it works for now. > > Well its all the special cases for batch scheduling that I don't like, > the idea to not run batch tasks on a package running non batch processes > is sound. I thought the batch scheduling code is Ingo's, but I could > be mistaken. Anyway...
I realise the special cases suck. Code for one setting in a spot where it affects everyone is bad. Regarding the batch scheduling; no that's my special flavour coded ugly from the ground up. Ingo's is much smarter than this but once again I needed something that works now without too much effort.
> > >>How about this: if a task is "delta" priority points below a task running > >>on another sibling, move it to that sibling (so priorities via timeslice > >>start working). I call it active unbalancing! I might be able to make it > >>fit if there is interest. Other suggestions? > > > >I discussed this with Ingo and that's the sort of thing we thought of. > > Perhaps a relative crossover of 10 dynamic priorities and an absolute > > crossover of 5 static priorities before things got queued together. This > > is really only required for the UP HT case. > > Well I guess it would still be nice for "SMP HT" as well. Hopefully the > code can be generic enough that it would just carry over nicely.
I disagree. I can't think of a real world scenario where 2+ physical cpus would benefit from this.
> It does > have complications though because the load balancer would have to be taught > about it, and those architectures that do hardware priorities probably > don't even want it.
Probably the simple relative/absolute will have to suffice. However it still doesn't help the fact that running something cpu bound concurrently at nice 0 with something interactive nice 0 is actually slower if you use a UP HT processor in SMP mode instead of UP.
Con
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