Diagnosing runaway CPU in a .Net production application

Question

Does anyone know of a tool that can help me figure out why we are seeing runaway CPU in a managed app?

What I am not looking for:

Answer 1

It does sound like you need a real profiler, but I thought I'd just throw this out there: PerfMon. It comes with windows, you can setup a perfmon profile that you can send to the user, they can capture and send you the log.

Here's a couple links I've kept around every time I need a perfmon refresher: TechNet magazine from 2008 and a post from the Advanced .NET Debugging blog.