Both the kernel kvm and user-space qemu support SystemTap
probes. These are some examples using those probe points to gain a
better understanding of where the performance problems exist in
virtualization system.

Information about the qemu tracing points is at:

http://wiki.qemu.org/Features/Tracing

For more information about SystemTap:

http://sourceware.org/systemtap/

These examples may or may not work in your particular evironment.
Feedback about the examples would be appreciated.  Please
comment about them on [email protected].

-Will Cohen