MTD/flash perfomance statistics

[Bruce_Leonard at selinc.com]

We're using UBIFS/UBI/MTD/NAND and we want to find out how much of our 
time is spent accessing the flash.  Are there any tools or is there any 
code in that chain that collects any sort of statistics on flash 
performace/utilization?  I could do something as crude as a counter in my 
NAND driver, but if there's anything more sophisticated that I can just 
"use out of the box" so to speak that would be better.  Thanks.

Bruce