global count;
global testing = 1
probe kernel.function("__wake_up_common") if (testing)
{
  count++
  if (count <= 8)
    { system("echo sleeping") } /* NB: these are enqueued */
  else if (count <= 16)
    { warn("") } // using empty strings to avoid interjection of other strings in middle
  else if (count <= 24)
    { error("") } // ditto
  else // 25
    {
      printf("count: %d\n", count)
      testing = 0
    }
}