Enabling Raspberry Pi Performance Counter Support on Linux perf_event
نویسندگان
چکیده
The Raspberry Pi is a low-cost, low-power, embedded ARM platform designed for use as an educational tool. The ARMv6 processor core included on the Raspberry Pi includes support for hardware performance counters (low-overhead registers that can provide detailed architectural performance measurements). Support for these counters is available for ARM Linux via the perf event interface, but not enabled by default for the Raspberry Pi. In this paper we investigate why the counters were not enabled, describe what steps are needed to enable them, and then validate the results to ensure they are working. We contributed the patches needed to enable the counters to upstream Linux maintainers so that support will be available by default for all users.
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