Hi, Ralf According to the feedback received during the development of the previous versions of Perf-events, changes to the code are getting slight. So I think it's a good time to ask you to help review the code. The patches 1~7 can be reviewed/applied/tested independently. And 8~12 are trying to make Oprofile use Perf-events framework as backend, and are depended on perf_event_rm9000.c and perf_event_loongson2.c to be added in. Thanks for your time, Deng-Cheng