Simple traffic monitor(WIP)

[YWHyuk]

This is simple version of EPT monitoring tool. It handle a part of issue #7. This patch make kernel expose some metrics

• vCPU id
• Guest Physical address
• Guest Virtual address
• Guest program counter
• Guest cr3 register
• Protection attribute

Also, attached simple python script monitor.py. It parses metrics and report

• most hot memory address or
• most hot program counter.

I'll attach a example below.

$ python monitor.py
RIP:ffffffff811c409e Miss: 5388
RIP:ffffffff81440c39 Miss: 9423
RIP:ffffffff810ec4e8 Miss: 9896
RIP:ffffffff810b88c3 Miss: 128777 <down_read_trylock>
RIP:ffffffff810b8da7 Miss: 152979 <up_read>
RIP:ffffffff8144c717 Miss: 181586 <clear_page_erms>
Total 520949

[YWHyuk]

I think it should be another branch or introduce a new macro ex) #define MONITOR.