Messages in this thread | | | Date | Mon, 19 Jun 2023 14:02:15 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH V3 6/6] sched/fair: Implement starvation monitor |
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On Fri, Jun 16, 2023 at 02:05:07PM +0200, Peter Zijlstra wrote: > On Tue, Jun 13, 2023 at 03:41:30PM +0200, Daniel Bristot de Oliveira wrote: > > > In an 0-laxity scheduler, the server would run at 0-laxity, jumping in > > front of DL tasks... that would break EDF. It would be mixing two > > schedulers in one. It is not required and likely not a good idea either. > > I did consider a hybrid 0-laxity and EDF scheduler for mixed > criticality, as have others like Ted Baker IIRC. IIRC it can be done > using an augmented tree, but none of that solves the problems 0-laxity > has (like over preemption and the general problem of playing chicken by > doing things at the *VERY* last possible moment). > > I think I did a talk at OSPERT on this at some point many years ago. > Luckily some bright fellow had this semi-partitioned stuff that would > make live much simpler :-)
I must clarify; I was thinking Least-Laxity-First, which is ofcourse not the same as a 0-laxity scheduler.
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