Hey all, I just tried to use LBR with a user defined dynamic trace point and get a strange error message:
$ sudo perf probe -x /lib64/libc.so.6 malloc $ sudo perf record -e probe_libc:malloc --call-graph lbr -F 1000 ./foo Error: The sys_perf_event_open() syscall returned with 95 (Operation not supported) for event (probe_libc:malloc). /bin/dmesg may provide additional information. No CONFIG_PERF_EVENTS=y kernel support configured? When I do the same with the Dwarf unwinder, it works just fine. Using the LBR unwinder with a performance counter like instructions also works fine. Does anyone know what the issue is here? -- Milian Wolff | [email protected] | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts
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