1. A computing system that includes a processor and that supplies the processor with a source indication for an instruction instance executed by the processor, wherein the instruction instance requests data from a first piece of hardware that is external to the processor, wherein the instruction instance is associated with a runtime event, wherein the processor supplies an encoding of the runtime event associated with the source indication for profiling of code, and wherein the source indication represents a cumulative path from the first piece of hardware, through a second piece of hardware, to the processor.