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SubjectRe: [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes
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On Tue, 2007-05-08 at 12:29 +0900, Satoru Takeuchi wrote:
> At Tue, 08 May 2007 13:02:25 +1000,
> Rusty Russell wrote:
> > 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 ;-(

OK, well, I agree with "don't do that" then 8)

Thanks,
Rusty.

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