PERFORMANCE MEASUREMENT UNIT

摘要

PROBLEM TO BE SOLVED: To provide a performance measurement unit.SOLUTION: A performance measurement unit includes: a first event counter for recording an event count value indicating the number of events which occur in a processor core; and a second event counter for copying the event count value recorded in the first event counter. When the processor core enters a predetermined operation mode, the second event counter copies the event count value recorded in the first event counter. The predetermined operation mode is an operating system kernel mode. The performance measurement unit further includes a counter setting logic for selectively permitting the second event counter to copy the event count value recorded in the event counter.