testsuite/systemtap.examples/general/grapher.stp


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#! /usr/bin/stap

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

# 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") {
 printf("kbd %d %d\n", gettimeofday_ms(), 75)
}