Mechanism for using performance counters to identify reasons...

Details Mechanism for using performance counters to identify reasons... Mechanism for using performance counters to identify reasons...

2011-02-22

2011-02-22

Petranek, Jacob (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Specialized instruction processing in support of testing,...

Reexamination Certificate

active

07895421

ABSTRACT:
A system and method of accounting for lost clock cycles in a microprocessor. A method includes detecting a first reason which prevents exit of an entry from an instruction retirement queue, and incrementing a first count corresponding to the first reason, wherein the first count is incremented while the first reason prevents exit of the entry from the queue. A first point in time is determined when said first reason no longer prevents exit of the entry from the queue. A second reason which prevents exit of the entry from the queue is detected, wherein the second reason came into existence prior to said first point in time. A second count corresponding to the second reason is incremented, wherein incrementing the second count begins at the first point in time.

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