Functions Related to Hardware Counter Overflow Profiling

The following functions are related to hardware counter overflow profiling:

• collector_not_program_related: The counter does not relate to the program.

• collector_lost_hwc_overflow: The counter appears to have exceeded the overflow value without generating an overflow signal. The value is recorded and the counter reset.

• collector_lost_sigemt: The counter appears to have exceeded the overflow value and been halted but the overflow signal appears to be lost. The value is recorded and the counter reset.

• collector_hwc_ABORT: Reading the hardware counters has failed, typically when a privileged process has taken control of the counters, resulting in the termination of hardware counter collection.

• collector_final_counters: The values of the counters taken immediately before suspending or terminating collection, with the count since the previous overflow. If this corresponds to a significant fraction of the <Total> count, a smaller overflow interval (that is, a higher resolution configuration) is recommended.

• collector_record_counters: The counts accumulated while handling and recording hardware counter events, partially accounting for hardware counter overflow profiling overhead. If this corresponds to a significant fraction of the <Total> count, a larger overflow interval (that is, a lower resolution configuration) is recommended.