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@@ -417,6 +417,15 @@ MIX >
@end example
@end deffn
+@deffn {debug command} sbt [NUMBER]
+This command changes the limit for the backtrace of executed instructions.
+If the number is omitted, the command prints the current limit. If you
+use a 0, backtraces are turned off. This can improve performance. If you
+wish for all the instructions to be logged, a -1 will enable that. The
+amount of memory required for unlimited backtraces can be substantial
+for long-running programs.
+@end deffn
+
@deffn {debug command} pbt [INS_NUMBER]
This command prints a backtrace of executed instructions. Its optional
argument @var{ins_number} is the number of instructions to print. If it