n fine mode, addresses can be specified exactly, 
			but both the start and end addresses must exist on the same 4K byte page. In 
			other words, the address range must be less than 4K bytes, and the addresses 
			can only differ in the bottom 12 bits. If fine mode cannot be used, the 
			underlying perfmon library automatically switches to coarse address 
			specification. Four pairs of registers are available to specify coarse 
			instruction address ranges. The restrictions to coarse address specificati