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SubjectRe: [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes
On Mon, May 07, 2007 at 04:17:24PM +0530, Gautham R Shenoy wrote:
> Nevertheless, with the freezer based approach that we're experimenting,
> this problem shouldn't arise. We expect the whole system to get frozen
> before we actually do a cpu_down() (which will then call
> __stop_machine_run). So any such rogue RT task will have to first fail
> the freezer ( which it will),

From what I understand of the freezer, if the RT task is running in user
space (which seems to be the case in this thread), it should get frozen even
if it is a forever running SCHED_FIFO task at MAX_RT_PRIO -1 priority?

> but that's ok, since on a freezer-fail,
> we just thaw all the processes and get the system up and running again.
> Yeah, the cpu-hotplug operation will fail though.

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