Messages in this thread | | | Subject | Re: register_timer_hook use in arch/sh/oprofile | From | Peter Zijlstra <> | Date | Fri, 26 Jun 2009 09:01:25 +0200 |
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On Wed, 2009-06-24 at 15:24 +0200, Ingo Molnar wrote: > > [ And long-term analysis ('perf stat' type of runs) dont need IRQs > anyway - perfcounters reads outs the counts and summarizes them > across the measured workload. ]
If the counter width is less than 64 bits we do need to have some interrupt to read them from before they cycle so we can accumulate the deltas into a proper u64.
But for proper 64 bit hardware counters there is indeed no need for that.
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