prf - operating system profiler
The special file /dev/prf provides access to activity information in the
operating system. Writing the file loads the measurement facility with
text addresses to be monitored. Reading the file returns these addresses
and a set of counters indicative of activity between adjacent text
The recording mechanism is driven by a separate profiling clock. The
profiling clock period is set so that it does not become synchronized
with the regular system clock. Samples that catch the operating system
are matched against the stored text addresses and increment corresponding
counters for later processing.
The file /dev/prf is a pseudo-device with no associated hardware.
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