Messages in this thread | | | Date | Fri, 30 Aug 2019 17:31:10 -0700 | From | Andi Kleen <> | Subject | Re: [RESEND PATCH V3 3/8] perf/x86/intel: Support hardware TopDown metrics |
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> the same manner. It would greatly simplify the kernel implementation.
I tried that originally. It was actually more complicated.
You can't really do deltas on raw metrics, and a lot of the perf infrastructure is built around deltas.
To do the regular reset and not lose precision over time internally you have to keep expanded counters anyways. And if you do that you can just expose them to user space too, and have everything in user space just work without any changes (except for the final output)
-Andi
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