1. A method, comprising: monitoring multithreaded hardware yield operations from a first hardware thread of a processor core to a second hardware thread of the processor core; determining utilization of a processor core by the first and second hardware threads over a time interval; determining a duration of the multithreaded hardware yield operations through subtraction of an initiation time value stored upon initiation of the multithreaded hardware yield operations from a completion time value obtained upon completion of the multithreaded hardware yield operations; subtracting the duration of the multithreaded hardware yield operations from a core utilization counter for the first hardware thread; and combining the utilization of the processor core over the time interval with the core utilization counter for the first hardware thread to determine total core utilization during the time interval by the first hardware thread.