When diving into a large code base and trying to understand how it works, one thing that would be very helpful to know is how control gets to a particular point in the code. That is, for a given subroutine, what does the stack look like when the subroutine is executed?
This is similar to what dtrace on Solaris can do for system calls, but I am only looking to instrument perl subroutines (or points in perl code.) Also, like dtrace, it would be nice to do this on a running perl/mod_perl process. It's kinda like being able to attach the perl debugger to a running process. I realize I'm probably just dreaming right now, but I figured I'd at least bring up the idea with other perl users.
