What does "cpu_time" represent exactly in libvirt? : <p>I can pull the following CPU values from libvirt:</p>

<pre><code>virsh domstats vm1 --cpu-total
Domain: 'vm1'
  cpu.time=6173016809079111
  cpu.user=26714880000000
  cpu.system=248540680000000

virsh cpu-stats vm1 --total
Total:
    cpu_time       6173017.263233824 seconds
    user_time        26714.890000000 seconds
    system_time     248540.700000000 seconds
</code></pre>

<p>What does the cpu_time figure represent here exactly?</p>

<p>I'm looking to calculate CPU utilization as a percentage using this data.</p>

<p>Thanks</p>
