On Tue, 2007-04-10 at 14:34 +0200, Pieter Palmers wrote:
> I'm also wondering why/whether threaded IRQ's can't be software-demuxed
> in the kernel. A very basic interrupt handler like this:
>
> handle_irq() {
> switch(irq_source) {
> case HDA:
> set_my_prio(high);
> hda_handle_irq();
> case 1394:
> set_my_prio(low);
> 1394_handle_irq();
> }
> }
>
> Ingo's threaded IRQ stuff does something like this, but I don't quite
> know the details of it. I'm under the impression that it allows setting
> the priority of the 'handle_irq()' but not of the dispatched IRQ handlers.
yes, thats correct. the priority of the IRQ itself is based in h/w, and
is not affected by the scheduling class or priority of the kernel task
that runs the *_handle_irq(). the point of ingo's changes are that
*_handle_irq() runs in a dedicated task/thread per IRQ at a (relatively)
fixed priority.
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