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diff --git a/contrib/perl5/ext/Devel/DProf/Todo b/contrib/perl5/ext/Devel/DProf/Todo
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+- 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;