By default, op_help lists the available performance counter options. If you give it a symbolic event name, it will return the hardware value (e.g. "op_help DATA_MEM_REFS").

--cpu-type / -c

Show the events for the given numerical CPU type.

--get-cpu-type / -r

Show the symbolic CPU name.

--help / -? / --usage

Show help message.

--version / -v

Show version.

$prefix/share/oprofile/

Event description files used by OProfile.

/var/lib/oprofile/samples/

The location of the generated sample files.

This man page is current for oprofile-0.8.1.