Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 11 Jul 2023 10:44:52 +0530 | Subject | Re: Invalid event (cycles:pp) in per-thread mode, enable system wide with '-a'. | From | Ravi Bangoria <> |
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On 11-Jul-23 2:52 AM, Nick Desaulniers wrote: > On Sun, Jun 25, 2023 at 10:45 PM Ravi Bangoria <ravi.bangoria@amd.com> wrote: >> >> Hi Nick, >> >> On 23-Jun-23 9:53 PM, Nick Desaulniers wrote: >>>>> On 12-Oct-22 3:02 AM, Nick Desaulniers wrote: >>> Hi Ravi, >>> Sorry, I'm not able to load a custom kernel image on my employer >>> provided workstation, and I never got approval to expense hardware for >>> testing this otherwise. >>> >>> Was there ever any update on this? I'm on 6.1.25 now and still cant run >>> $ perf record -e cycles:pp --call-graph lbr <any command to profile> >> >> Per-process precise sampling on AMD platforms should work from 6.2-rc1 >> onward. > > Ok, I can wait for my employer to ship 6.2 on our workstations. > >> However, --call-graph=lbr is not supported on AMD (hw limitation). > > On any AMD uarches? Is there an equivalent? LBR encoding is compact > which makes working it much faster than DWARF or stack frame > unwinding.
I understand that LBR call-stack is the fastest option but unfortunately none of the current AMD uarch supports it.
Thanks, Ravi
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