Re: new IRQ scalability changes in 2.3.48

From: Andrea Arcangeli (andrea@suse.de)
Date: Thu Mar 02 2000 - 10:06:57 EST


On Fri, 3 Mar 2000, Ingo Molnar wrote:

>check out the 'focus CPU' feature.

24319201.pdf 7.4.10:

        "In lowest priority mode, if a focus processor exists, it may
         accept the interrupt, regardless of its priority. A processor is
         said to be the focus of an interrupt if it is currently servicing
         that interrupt or if it has a pending request for that
         interrupt."

Can a CPU have pending request for an interrupt and be running with irq
locally disabled?

Andrea

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