[Erik-Lundell]

This is done as soon as ethosu_execution_stats is linked, was built with ET_EVENT_TRACER_ENABLED, and a tracer is available.

No EthosUStatsBuffer registration is neccessary.

The metrics are written as a profile_event with
delegate_debug_id_str = "ethosu.pmu.counters", and delegate_debug_metadata binary blob described in
EthosUExecutionStats.h. The blob begins with EUC1 (EthosU Counters), where 1 is a versioning number.

For consuming the metrics,
backends/arm/ethosu/parse_delegate_metadata.py
is added that provides

parse_pmu_profile_event() -> EthosUPmuProfileEvent, that parsers the blob into a typed dataclass, and

parse_ethosu_delegate_pmu_metadata() -> dict
that can be passed to the delegate_metadata_parser argument of Inspector.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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✅ You can merge normally! (3 Unrelated Failures)

As of commit a3cb696 with merge base a489dca ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / nxp-mcuxpresso-test / linux-job (gh) (trunk failure)
  undefined reference to SYS_INFO_PrintAll'`
• trunk / test-torchao-huggingface-checkpoints (lfm2_5_1_2b, mt-l-arm64g4-16-62, executorch-ubuntu-22.04-gc... / linux-job (gh) (trunk failure)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1
• trunk / test-torchao-huggingface-checkpoints (lfm2_5_1_2b, mt-l-x86iavx512-8-64, executorch-ubuntu-22.04-... / linux-job (gh) (trunk failure)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

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