How can I get write request callback?

[Liu-Cheng]

I see there is a callback function for read request, but I don't see any write request call back.
I find the read request callback is invoked in Controller.cpp while processing the pending request queue. The pending queue is only for read request. Could you give me some suggestions on invoking write request callback?

Thank you.

[lucjaulmes]

Try lucjaulmes/ramulator@23a409c