Performance Feature Improvements in RISC-V Linux Kernel

Explore performance feature improvements in RISC-V Linux kernel in this 16-minute conference talk from the Linux Plumbers Conference. Delve into the current limitations of basic perf support with counter overflow and stat, and learn about the multiple perf-related ISA extensions being drafted to address these concerns. Examine existing challenges and new implementation issues for ISA extensions, including counter event mapping, event encoding, host and guest usage for perf, kernel blind spot profiling with SSE, and restricted user space access for cycle/instret. Gain insights into the speaker's objective of gathering early feedback from the community to determine the best path forward for RISC-V performance enhancements.