Messages in this thread | | | Date | Tue, 1 Dec 2009 12:04:40 +0000 | From | Jamie Iles <> | Subject | Perf events/ARM |
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Hi,
I'm looking at adding support for the hardware performance counters in ARMv6 using the new perf events framework. I have a simple setup that uses the counters on their own, but wrt the perf events framework:
- what are the requirements of set_perf_event_pending() and perf_event_do_pending()? As far as I can tell from sparc/x86/powerpc, set_perf_event_pending() triggers an interrupt that then calls perf_event_do_pending(). Does perf_event_do_pending need to run in interrupt context or could I use a soft IRQ if platforms don't have a spare IRQ?
- ARM does not have proper support for atomic64's. Other than performance, would there be any known problems with using the generic spinlocked atomic64's?
Thanks,
Jamie
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