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Filename : func_time_stats.stp

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#!/usr/bin/stap
/*
 * func_time_stats.stp
 * usage: func_time_stats.stp function_probe
 */

global start, intervals

probe $1 { start[tid()] = gettimeofday_us() }
probe $1.return
{
  t = gettimeofday_us() 
  old_t = start[tid()]
  if (old_t) intervals <<< t - old_t
  delete start[tid()]
}
probe end
{
  printf("intervals min:%dus avg:%dus max:%dus count:%d variance:%d\n",
         @min(intervals), @avg(intervals), @max(intervals),
         @count(intervals), @variance(intervals, 3))
  print(@hist_log(intervals));
}