jiffies on guest linux

[mikalankes]

Hello,

I'm conducting research on real-time scheduling of virtual machines, and I'm currently using the setup:

Host: Ubuntu 9.10
Guest: Ubuntu 9.10
VirtualBox version: 3.0.8

My question is: Does the 'jiffies' (absolute time kernel variable) update in a guest machine when the machine is not running, i.e., when the machine is put to idle by the linux host scheduler?

A general question: What happens with the time in the guest when it gets preempted by the host operating system scheduler? Is time frozen or does it elapse?

Regards