RT process priority > Interrupts ?

[Valdis.Kletnieks at vt.edu]

On Thu, 09 Apr 2015 10:59:20 +0900, manty kuma said:
> In Linux, when a real time process is executing and an interrupt comes,
> will the RT process be preempted?
>
> Is RT process considered superior to interrupts?

Think it through - that would imply that RT processes effectively run with
interrupts disabled (or ignored, which amounts to the same thing).  What would
be the result of that? How would the system behave?  Consider in particular
that RT processes want a hard maximum on latency (and usually as low latency as
you can get).  Remember to consider the case of more than one RT process on a
system....

For bonus points, work it out for both hard and soft IRQs.
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