VCS 6.0.1 linux - How CPU usage is calculated?

Hello All,

Maybe this is already known answer but I tried to find how VCS 6.0.1 HostMonitor is calculating CPU usage on Linux hosts and didn't found answer.
Can somebody of you answer this question?
I would like to know from where it is collecting CPU data, if it is an avarage CPU usage... (It is looks like that collected information is wrong)

Thank you very much.

Iv4n