HiSilicon Performance Monitor Control Unit - Offloading PMU Accesses

Explore the Performance Monitor Control Unit (PMCU) device for Kunpeng SoC in this Linux Plumbers Conference talk. Learn how PMCU offloads PMU accesses from CPUs, handling configuration, event switching, and counter reading of core PMUs. Discover the benefits of fine-grained and multi-PMU-event CPU profiling with reduced software overhead and minimal impact on target workloads. Understand the implementation of PMCU's software stack using the 'perf_event' auxtrace framework, including documentation, driver, and user perf tool support. Delve into challenges such as synchronizing PMCU with CPU internal accesses and potential conflicts between arm_pmu and PMCU events. Gain insights into the current state of PMCU development and participate in discussions on use cases, interfaces, and implementation improvements for this non-intrusive CPU monitoring solution.