Hi all,

This proposal is a refinement and update of a previous thread: https://lists.riscv.org/g/tech-privileged-archive/message/488.  We noticed the current activities regarding HPM in Linux community and in Unix Platform Spec Task Group, so again we would like to call for attention to the fundamental problems of RISC-V HPM.  In brief, we plan to add 6 new CSRs to address these problems.  Please check https://github.com/NonerKao/PMU_enhancement_proposal/blob/master/proposal.md for a simple perf example and the details.

Thanks!