2011/3/17 陳韋任 <che...@iis.sinica.edu.tw>:

>  The "better match" just means better than usual sampling mechanisms,
> right? Arun mentioned that "PEBS is known to be precise, but not
> accurate". So we still cannot get the exact IP which causes the event.
> Am I right?

Appendix B.2.3.3 Precise Execution Events in this doc:

http://www.intel.com/Assets/PDF/manual/248966.pdf

explains what Intel calls the "Shadowing effect" in some detail.

So yes, hardware can see the precise IP, but it doesn't let software
record it :(

 -Arun

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