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The processor includes performance monitors that enable you to gather various statistics on the operation of the processor and its memory system during runtime. They provide useful information that you can use when debugging or profiling code.
The PMU provides six counters. Each counter can count any of the events available in the processor. The absolute counts that the PMU records might vary because of pipeline effects. This variability only has an impact on the operation of the PMU when a counter is enabled for a short time.