1. A computer program product for monitoring processor characteristic information of a processor using run-time-instrumentation, the computer program product comprising: a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: executing an instruction stream on a processor; detecting a run-time instrumentation sample point of the executing instruction stream on the processor; and storing a reporting group in a run-time instrumentation program buffer based on the run-time instrumentation sample point, the reporting group including processor characteristic information associated with the processor.