Joe Korty wrote:

Create /proc/all-interrupts for some architectures.

Create a version of /proc/interrupts that displays _every_
IRQ vector, not just those that someone thought might be
interesting, and add an entry in the commentary column
for those vectors which lacked such a comment.

Rationale: /proc/interrupts is not truly useful unless it
displays every IRQ vector, not just those somebody thought
would be interesting.  For example, since /proc/interrupts
does not display the rescheduling interrupt, the occurance
of rescheduling interrupt floods ends up affecting
latencies, yet without an entry in /proc/interrupts, it
is difficult to discern why latencies are being affected.

Rather than modify /proc/interrupts, this patch creates
a new version of /proc/interrupts, on the off-chance
that adding new lines to /proc/interrupts, and appending
new fields to the end of old lines, might break some
longstanding script.  However, these kinds of changes
traditionally do not affect scripts, so it might be
reasonable to fold /proc/all-interrupts back into
/proc/interrupts.

I think that would be the right thing to do.  We have added things to
/proc/interrupts in the past.

	-hpa