Can't Add Perf Probe For C++ Methods


Answer :

As a workaround you can get the method address with objdump and perf probe will accept it.

  $ perf probe -x /path/file '0x643f30' Added new event:   probe_libfile:abs_643f30 (on 0x643f30 in /path/file)  You can now use it in all perf tools, such as:      perf record -e probe_libfile:abs_643f30 -aR sleep 1

Do note that perf probe expects an offset from the file, and objdump and readelf return the address after adjusting for the loading address. For -pie executable, where the loading address is 0, the addresses will be the same.
For non -pie executables you can get the loading address by looking at the output of readelf -l /path/file and searching for the offset 0x000000 and looking at what VirtAddr it points to, then subtract that number from the symbol address that you get from objdump --syms or readelf --syms. It will usually be 0x400000


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