The Oprofile manual indicates that I need a kernel patch to generate graph data.
I can find only two patches and

They seem out-of-date.  Any idea where I can get it?

The system that I am oprofiling on has CPU -- P4 / Xeon with 2 hyper-threads, i.e. pr-ht.
The version of oprofile on my system is oprofile 0.9.3 compiled on May 29 2008 17:31:09

Thank you.