Messages in this thread | | | Date | Tue, 26 Oct 2021 10:03:02 -0700 | Subject | Re: [PATCH V2 3/6] perf intel-pt: Support itrace A option to approximate IPC | From | Andi Kleen <> |
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On 10/26/2021 2:01 AM, Adrian Hunter wrote: > Normally, for cycle-acccurate mode, IPC values are an exact number of > instructions and cycles. Due to the granularity of timestamps, that happens > only when a CYC packet correlates to the event. > > Support the itrace 'A' option, to use instead, the number of cycles > associated with the current timestamp. This provides IPC information for > every change of timestamp, but at the expense of accuracy.
Can you expand a bit what exactly the accuracy loss it?
Would be good to describe that in the manpage too.
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