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- PPPPRRRRFFFF((((7777)))) PPPPRRRRFFFF((((7777))))
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- NNNNAAAAMMMMEEEE
- prf - operating system profiler
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- The special file /_d_e_v/_p_r_f 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
- addresses.
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- 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.
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- The file /_d_e_v/_p_r_f is a pseudo-device with no associated hardware.
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- FFFFIIIILLLLEEEESSSS
- /dev/prf
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- profiler(1M).
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- PPPPaaaaggggeeee 1111
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