> What other purposes do you see the performance counters useful for?
Export one to user space as a cycle counter for benchmarking. RDTSC doesn't
do this job anymore.
> To collect information on process characteristics so they can be scheduled
> more efficiently?
That might happen at some point in the future, but i would expect
us to wait for CPUs with more performance counters first.
> Is this going to require sharing the nmi interrupt and knowing which
> perfcounter
> register triggered the interrupt to get the correct action? Currently the
> oprofile interrupt handler assumes any performance monitoring counter it sees
> overflowing is something it should count.
Yes. That needs to be fixed.
-Andi
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