2018 LLVM Developers’ Meeting: B. Seshadri “Code Coverage with CPU Performance Monitoring Unit”

Thank you very much. good presented. I have a question. What about the accuracy of Hardware Performance Counters? As you know, the counters may produce different values between different execution. If we seek to count the number of retired instructions, the value will not be accrue due to several reasons, such as page faults or out of order execution. Can you please explain me if you take into account this issue in you work? Thanks