- work on test suite.- localize the depth to guard against non-local exits.Current overhead (with PERLDBf_NONAME) wrt non-debugging run (estimates):	 8% extra call frame on DB::sub	 7% output of subroutine data	70% output of timing data (on OS/2, 35% with custom dprof_times())(Additional 17% are spent to write the output, but they are counted and subtracted.)  With compensation for DProf overhead all but some odd 12% are subtracted ?!- Calculate overhead/count for XS calls and Perl calls separately.- goto &XSUB in pp_ctl.c;