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SubjectHardware performance counter overflow
Hi, I've noticed that there are quite a few hardware performance counter
patches (which allow access to things like the Pentium Model Specific
Registers for gathering profiling info) floating around, including Rabbit
(, Richard Gooch's patches, and
PAPI (very cool and portable, IMHO). But I haven't seen any of these that
supports delivering interrupts when counters overflow (the last version of
PAPI that I saw provides high-level emulation of this on Linux/x86, but
it's not really accurate enough for serious work).
Is there any other patch that supports overflows on Linux/x86, or is it
work that still needs to be done? Monitoring these overflows is the trick
behind large parts of Intel's VTune and SGI's SpeedShop, and I'd love to
see a profiler like this come to Linux. Basically, I'm a student and I
think it would be an interesting project, but I don't want to re-invent the
wheel unnecessarily.
Thanks a lot!

PS Please CC me at with any replies, if you don't

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