Messages in this thread | | | Date | Tue, 08 May 2007 12:29:19 +0900 | From | Satoru Takeuchi <> | Subject | Re: [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes |
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At Tue, 08 May 2007 13:02:25 +1000, Rusty Russell wrote: > > On Tue, 2007-05-08 at 11:41 +0900, Satoru Takeuchi wrote: > > At Mon, 07 May 2007 23:42:53 +1000, > > Rusty Russell wrote: > > > I look forward to your patch! > > > Rusty. > > > > Thanks, I'll do. Maybe this work will take several days including test. > > Excellent. > > > BTW, how should I manage rt process having max priority as Gautham said? > > He said that it's OK unless such kernel thread exists. However, currently > > MAX_USER_RT_PRIORITY is equal to MAX_RT_PRIO, so user process also be able > > to cause this problem. Is Srivatsa's idea 2 acceptable? Or just apply > > "Shouldn't abuse highest rt proority" rule? > > We used to be able to create kernel threads higher than any userspace > priority. If this is no longer true, I think that's OK: equal priority > still means we'll get scheduled, right?
IF SCHED_RR, yes. However, if SCHED_FIFO, no. Such process doen't have timeslice and only relinquish CPU time voluntarily.
# Hence this problem is complicated ;-(
Thanks,
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