[virt-tools-list] Virt Manager CPU usage calculation algorithm

[Maxim Sditanov]

Good day

I implementing in virsh more detailed output for domains
(https://bugzilla.redhat.com/show_bug.cgi?id=595428).
And i stuck with CPU usage percentage calculation. How virt manager
calculate cpu percentage?
I tried to read virt-manager sources, but it is hard for me to
understand virt-manager (i am not familiar with python).
I found function "_sample_cpu_stats" in file src/virtManager/domain.py
and i think this function make calculations. But i may be wrong

Please, describe logic, how virt-manager calculate cpu usage

Thanks

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With best wishes, Maxim Sditanov