blog post on timekeeping in fio

[Vincent Fu <vincentfu@xxxxxxxxx>]

I have written a blog post describing how fio uses the CPU clock to keep 
time. It's admittedly a slog to understand the entire process but I 
think there is some nice engineering in there.

https://github.com/vincentkfu/fio-blog/wiki/How-does-fio-keep-time

Feedback is appreciated!

Vincent