testsuite/systemtap.examples/general/grapher.stp


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#! /usr/bin/stap

probe begin
{
printf ("%%Title:CPU utilization\n");
printf ("%%XAxisTitle:Time\n");
printf ("%%YAxisTitle:Percent\n");
printf ("%%DataSet:cpu 100 00ff00 bar\n");
printf ("%%DataSet:kbd 75 ff0000 discreet\n");
}

# CPU utilization
probe begin { qnames["cpu"] ++; qsq_start ("cpu") }
probe scheduler.cpu_on { if (!idle) {qs_wait ("cpu") qs_run ("cpu") }}
probe scheduler.cpu_off { if (!idle) qs_done ("cpu") }

global qnames

function qsq_util_reset(q) {
  u=qsq_utilization (q, 100)
  qsq_start (q)
  return u
}

probe timer.ms(100) {  # collect utilization percentages frequently
  foreach (q in qnames)
    printf("cpu %d %d\n", gettimeofday_ms(), qsq_util_reset(q))
}

probe kernel.function("kbd_event") {
 if ($event_type == 1 && $value)
   printf("kbd %d %d\n", gettimeofday_ms(), $event_code)
}