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Filename : qemu_io.stp

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#!/usr/bin/stap
#
# Copyright (C) 2011 Red Hat, Inc.
# Written by William Cohen <wcohen@redhat.com>
#
# The qemu_io.stp script tallies the number of times each of the IO
# port on the guest virtual machines is touched by a input or output
# operation. When the script exits, it prints a count of the number of
# times each IO port read and written.

global cpu_in, cpu_out
probe qemu.*.*.cpu_in?, qemu.kvm.cpu_in? { cpu_in[addr]++ }
probe qemu.*.*.cpu_out?, qemu.kvm.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])
}