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SubjectRe: [discuss] Re: 2.6.19-rc5: known regressions (v3)

> 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.


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