2011/3/21 Lin Ming <[email protected]>: > 2011/3/21 陳韋任 <[email protected]>: >> Hi, Lin >> >>> It's used to control if some action is allowed or not for normal user. >>> See comments at kernel/perf_event.c: >>> >>> /* >>> * perf event paranoia level: >>> * -1 - not paranoid at all >>> * 0 - disallow raw tracepoint access for unpriv >>> * 1 - disallow cpu events for unpriv >>> * 2 - disallow kernel profiling for unpriv >>> */ >> >> I assume -1 give normal user the most high level privilege, >> but it doesn't work. I have tried -1 through 2, but none of >> them works. Any suggestion? Or maybe the event "branches" does >> not support PBES modifier (pp)? > > In x86_setup_perfctr: > > /* > * Branch tracing: > */ > if ((attr->config == PERF_COUNT_HW_BRANCH_INSTRUCTIONS) && > (hwc->sample_period == 1)) { > /* BTS is not supported by this architecture. */ > if (!x86_pmu.bts_active) > return -EOPNOTSUPP; > > /* BTS is currently only allowed for user-mode. */ > if (!attr->exclude_kernel) > return -EOPNOTSUPP; > } > > Does your CPU support PEBS? Please attach below output. > > dmesg |grep "Performance Events"
And also "cat /proc/cpuinfo" Thanks, Lin Ming > > Lin Ming > >> >> Thanks! >> >> Regards, >> chenwj >> >> -- >> Wei-Ren Chen (陳韋任) >> Parallel Processing Lab, Institute of Information Science, >> Academia Sinica, Taiwan (R.O.C.) >> Tel:886-2-2788-3799 #1667 >> > -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
