Messages in this thread | | | Date | Sat, 12 Jul 2003 15:42:46 -0700 | Subject | Re: [patch] SCHED_SOFTRR linux scheduler policy ... | From | Bill Huey (Hui) <> |
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On Sat, Jul 12, 2003 at 08:59:18AM -0700, Davide Libenzi wrote: > On Sat, 12 Jul 2003, Jamie Lokier wrote: > > > Davide Libenzi wrote: > > > With the current patch you do not need any special support if you are > > > already asking for SCHED_RR policy. If you are not root you will be > > > automatically downgraded to SCHED_SOFTRR ;) > > > > Cool. What happens if you run two SCHED_SOFTRR tasks and they both > > use 50% of the CPU - will that starve all the other tasks? Or is the > > CPU usage of all SOFTRR tasks bounded collectively? > > Nope :) They will run their timeslice entirely and then they will try to > get some more. Looking at their last recharge timestamp, Dad scheduler > will put them in bed and will give other tasks a chance to run. But don't > worry, I am very sure there're other exploit available. I just didn't have > enough time to think about it. It is amazing how limited are things that > you can do in one hour :)
Hey,
Have any of you folks seen this ?
http://www.linuxdevices.com/articles/AT6078481804.html http://research.microsoft.com/~mbj/papers/tr-99-59_abstract.html
Neat stuff. This with a fully preemptive kernel is one of Linux kernel dreams for multimedia.
bill
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