Here are results  for netbsd/walnut 

cpu0 at mainbus0: 264MHz 405GP (Revision 1.69)

bash-2.05# ./lockprof 
Registering restartable atomic sequences
Timing unlock overhead
Timing RAS locks
Timing CPU locks (inlined)
Timing CPU locks (not inlined)
unlock overhead: 1.139334 s (0.011393 us/loop)
RAS: 4.555380 s (0.045554 us/loop)
cpu locks (inlined): 7.595705 s (0.075957 us/loop)
cpu locks (not inlined): 9.492122 s (0.094921 us/loop)