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Hi together,
Recently on cachyos we have updated the linux-tools perf to the 6.12 release.
When trying to convert the profile with perf 6.12 I get following:
create_llvm_prof --binary=/usr/src/debug/linux-cachyos/vmlinux --profile=/home/ptr1337/bench/withoutprime.data --format=extbinary --out=cachyos-benchmarker.afdo
[ERROR:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:161] Event size 0 of event UNKNOWN_EVENT_0 is less than header size 8
[ERROR:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1335] Error reading build ID header.
WARNING: Logging before InitGoogleLogging() is written to STDERR
E20241205 17:53:35.636153 254754 profile_creator.cc:209] Error reading profile from /home/ptr1337/bench/withoutprime.data
When using perf 6.10 it does work correctly:
create_llvm_prof --binary=/usr/src/debug/linux-cachyos/vmlinux --profile=/home/ptr1337/bench/withoutprime.data --format=extbinary --out=cachyos-benchmarker.afdo
[WARNING:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1322] Skipping 268 bytes of metadata: HEADER_CPU_TOPOLOGY
[WARNING:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1069] Skipping unsupported event PERF_RECORD_ID_INDEX
[WARNING:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1069] Skipping unsupported event PERF_RECORD_EVENT_UPDATE
[WARNING:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1069] Skipping unsupported event PERF_RECORD_CPU_MAP
[WARNING:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1069] Skipping unsupported event UNKNOWN_EVENT_17
[WARNING:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1069] Skipping unsupported event UNKNOWN_EVENT_82
[INFO:/home/runner/work/autofdo/autofdo/third_party/perf_data_converter/src/quipper/perf_reader.cc:1060] Number of events stored: 4931669
Reproducer:
- Go into cachyos or archlinux enviroment
- Compile kernel with autofdo support and an unstripped vmlinux
- Boot into the kernel and profile a workload with perf record --pfm-events RETIRED_TAKEN_BRANCH_INSTRUCTIONS:k -a -N -b -c 500009 -o cachyos-benchmarker.data -- cachyos-benchmarker ~/bench
- Try to convert the profile: create_llvm_prof --binary=/usr/src/debug/linux-cachyos/vmlinux --profile=/home/ptr1337/bench/withoutprime.data --format=extbinary --out=cachyos-benchmarker.afdo
If you need further logs, please let me know
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