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Increased attention to RISC-V in Cloud, Data Center, Automotive andNetworking applications, has been fueling the move of RISC-V to thehigh-performance computing scenario. However, lack of powerful performancemonitoring tools will result in poorly optimized applications and,consequently, a limited computing performance. While the RISC-V ISA alreadydefines a hardware performance monitor (HPM), current software gives limitedsupport for monitoring performance. In this paper we introduce extensions andmodifications to the Performance analysis tools for Linux(perf/perf_events),Linux kernel, and OpenSBI, aiming to achieve full support for the RISC-Vperformance monitoring specification. Preliminary testing and evaluation wascarried out in Linux 5.7 running on a FPGA booted CVA6 CPU, formerly namedAriane, showing a monitoring overhead of 0.283%.

Supporting RISC-V Performance Counters through Performance analysis tools for Linux (Perf)