global cpu_in, cpu_out
probe qemu.system.x86_64.cpu_in { cpu_in[addr]++ }
probe qemu.system.x86_64.cpu_out {cpu_out[addr]++ }
probe end {
  # write out the data
  printf("\ncpu_in\n%6s %8s\n","port", "count")
  foreach (addr+ in cpu_in)
    printf("0x%04x %8d\n", addr, cpu_in[addr])
  printf("\ncpu_out\n%6s %8s\n","port", "count")
  foreach (addr+ in cpu_out)
    printf("0x%04x %8d\n", addr, cpu_out[addr])
}