PERF_EVENT_IOC_REFRESH  456 include/uapi/linux/perf_event.h #define PERF_EVENT_IOC_REFRESH			_IO ('$', 2)
PERF_EVENT_IOC_REFRESH  456 tools/include/uapi/linux/perf_event.h #define PERF_EVENT_IOC_REFRESH			_IO ('$', 2)