Hi, William

  Thanks for the explaination.

> There are some mechanism such and Intel's Precise Event Buffer (PEBS) and 
> AMD's Instruction Based Sampling to better match events and the instructions 
> that caused them. Depending which processor and version of software you are 
> using these mechanisms might available.

  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?

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Parallel Processing Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667

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