Re: [PATCH V2 3/6] perf intel-pt: Support itrace A option to approximate IPC

[Andi Kleen]

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.