40.2.2.2. Unit Masks
40.2.2.2. Unit Masks If the cpu_type is not timer , unit masks may also be required to further define the event. Unit masks for each event are listed with the op_help command. The values for each unit mask are listed in hexadecimal format. To specify more than one unit mask, the hexadecimal values must be combined using a bitwise or operation.
opcontrol --event= <event-name> : <sample-rate> : <unit-mask>