Hi :) I'd like to share a neat hack with you. It is a field access profiler that can be used on any program written in C (well, in theory at least). I wrote it so that I can use it on gnumach. I used it to come up with 322fa73afed84fe37fb7bfe0583109ff33eb26d7.
http://darnassus.sceen.net/gitweb/teythoon/axxxp.git The readme sheds some light on its operation, and has some fancy screenshots: http://darnassus.sceen.net/gitweb/teythoon/axxxp.git/blob/2628b116ae9ba2e4182714df17af4e64bd3d13f9:/README (If you are using Debian/testing, be aware of #742779.) Cheers, Justus