SV = PVGV(0x816c6e8) at 0x814f6d8
  GP = 0x816c720
    CV = 0x814f714
SV = PVGV(0x816f938) at 0x814f810
  GP = 0x81709f8
    CV = 0x0             <-- &Child::f doesn't exist
    CVGEN = 0x0

##</code><code>##

SV = PVGV(0x816f938) at 0x814f810
  GP = 0x81709f8
    CV = 0x814f714       <-- &Child::f aliased to &Base::f
    CVGEN = 0x4d         <-- ...for method dispatch only

##</code><code>##

SV = PVGV(0x816c6e8) at 0x814f6d8    # Reference (at 0x814f6d8) to typeglob (at 0x816c6e8)?
  GP = 0x816c720                     # Address of typeglob? Has AV, HV, CV.
    CV = 0x814f714                   # Address of CV of f()

SV = PVGV(0x816f938) at 0x814f810    # Akin to above
  GP = 0x81709f8                     # ""
    CV = 0x0                         # Child::f()'s pointer to CV, equiv place to Base::f()
    CVGEN = 0x0                      # "generated CV"? do you mean "this CVGEN 'slot' is used for nothing else than method dispatch"?


##</code><code>##

gv.c
453:                GvCVGEN(topgv) = PL_sub_generation;
##</code><code>##

gv.c
457-        else if (topgv && GvREFCNT(topgv) == 1) {
458-            /* cache the fact that the method is not defined */
459:            GvCVGEN(topgv) = PL_sub_generation;

...

1433-       /* Adding a new name to a subroutine invalidates method cache */
1434:       PL_sub_generation++;

##</code><code>##

dump.c
1544:   Perl_dump_indent(aTHX_ level, file, "    CVGEN = 0x%"UVxf"\n", (UV)GvCVGEN(sv));

##</code><code>##

sv.c
3330-       GvCVGEN(dstr) = 0; /* Switch off cacheness. */