[irq]: techie interrupted

Figuring out “what’s going on?” is always something very important. For example, knowing what processes were running on which processors can be very useful if you are doing OS development and/or performances evaluation. If applied to virtualization, that turns into figuring out what VMs were running on which processors (or, better, what virtual CPUs were running on which physical CPUs), during the execution of some workload.

When using Xen as hypervisor, all that is possible by means of two tools: xentrace and xenalyze.