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Architectures and Processors forum Number of performance monitoring units in ARM Cortex A-53 and A-9

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Number of performance monitoring units in ARM Cortex A-53 and A-9

user over 5 years ago

Home many performance monitoring units (PMU) are in ARM Cortex A-53 and A-9? Is there a single PMU for each core or single PMU for the whole processor?

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42Bastian Schick over 5 years ago +2 verified

Though the TRM is not clear about this, I am pretty sure it is one PMU per core. Esp. because most events like L1 cache accesses make no sense if they count every core's events. At least a CA9 TRM shows...