| 摘要 |
Hardware support for software controlled fast multiplexing of performance counters may include a plurality of performance counters operable to collect one or more counts of one or more selected activities, and a plurality of registers operable to store a set of performance counter configurations. A state machine may be operable to automatically select a register from the plurality of registers for reconfiguring the one or more performance counters in response to receiving a first signal. The state machine may be further operable to reconfigure the one or more performance counters based on a configuration specified in the selected register. The state machine yet further may be operable to copy data in selected one or more of the plurality of performance counters to a memory location, or to copy data from the memory location to the counters, in response to receiving a second signal. The state machine may be operable to store or restore the counter values and state machine configuration in response to a context switch event.
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