Messages in this thread | | | Date | Mon, 8 Nov 2004 16:42:46 +0100 | From | Ingo Molnar <> | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm2-V0.7.1 |
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* Esben Nielsen <simlo@phys.au.dk> wrote:
> On a SMP system you don't have these nice properties. You always have > to take into account that N processes are really running at the same > time.
not necessarily. In theory we could introduce the notion of "hyper-high-priority tasks" (e.g. SCHED_HYPER_FIFO), which tasks not only get preempted on one CPU immediately, but cause the kernel to stop and loop on all other CPUs as well. That way the same 'nice' properties of UP kernels get carried over to the SMP system as well, at the cost of serializing all execution while the hyper-high-prio task is running. Once the task stops running, the other CPUs can continue as well.
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