This function sets the value of *profiler-threshold* below which symbols are not profiled in a repeated profiling run. After a profiling run, all the symbols being profiled have a percentage value for the amount of time they were on the top of the stack. If *profiler-threshold* is set to 40 then by running reset-profiler with argument
:top
all symbols which are found on the top of the stack less than forty percent of the time are removed from the list of those symbols considered for profiling.