PERF_COUNT_HW_STALLED_CYCLES_BACKEND 57 include/uapi/linux/perf_event.h PERF_COUNT_HW_STALLED_CYCLES_BACKEND = 8, PERF_COUNT_HW_STALLED_CYCLES_BACKEND 57 tools/include/uapi/linux/perf_event.h PERF_COUNT_HW_STALLED_CYCLES_BACKEND = 8,