On Mon, May 07, 2007 at 04:32:56PM +0530, Srivatsa Vaddagiri wrote: > 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?
Yes, you are right. It will end up getting the fake signal. So yeah, freezer pretty much solves the problem for cpu hotplug. But I now wonder if we will have some problem with module stopping if we have a high prio SCHED_FIFO in the system. > > -- > Regards, > vatsa Regards gautham. -- Gautham R Shenoy Linux Technology Center IBM India. "Freedom comes with a price tag of responsibility, which is still a bargain, because Freedom is priceless!" - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/