1. A computer implemented method for performing run-time instrumentation, the method comprising: capturing, by a processor, run-time instrumentation data based on an instruction stream of instructions of an application program executing on the processor, the capturing comprising storing the run-time instrumentation data in a collection buffer of the processor; detecting, by the processor, a run-time instrumentation sample point trigger; and copying contents of the collection buffer into a program buffer as a reporting group based on the detecting the run-time instrumentation sample point trigger, the program buffer located in main storage in an address space that is accessible by the application program.