A simple perf test for clock_gettime()
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Build gettime_perf
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  $ export CROSS_COMPILE=<cross compile triple>
  $ make


Run gettime_perf
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  $ ./gettime_perf
  clock:        monotonic cycles:  157619725
  clock: monotonic-coarse cycles:  577629197
  clock:    monotonic-raw cycles:  156798341
  clock:         boottime cycles:  157180753