That works to an extent - only it only reports calls done in that pass through the code, and doesn't support object calls. Hmmm.

If I'm just going to report calls made during a call, I could always do global changes from

sub foo {

to

sub foo { 
    print STDERR "foo"

for all the modules. That would then dump out a list of used routines to STDERR (ie the web logs) as they were used. Hmmm.