Re: [PATCH v1 0/3] perf pmu: Add tool-provided NVMe PMU

[Namhyung Kim <namhyung@kernel.org>]

On Tue, Jun 09, 2026 at 12:03:45AM -0700, Ian Rogers wrote:
> This patch series introduces a tool-provided PMU for NVMe devices to expose
> various hardware logs as perf events.
> 
> Using libnvme, the new nvme_pmu extracts metrics from standard NVMe log pages
> including:
> - SMART / Health Information (e.g. data units read/written, power cycles,
>   temperature)
> - Endurance Group Information
> - FDP (Flexible Data Placement) Statistics
> - Error Information
> - Zoned Namespaces (ZNS) Changed Zones
> 
> Key features:
> - Dynamic probing of supported log pages on /dev/nvmeX. Unsupported events
>   are marked as deprecated and hidden from `perf list` by default.
> - Generic configuration encoding where the log type, size, and offset are
>   encoded directly into the event configuration.
> - Correct interval delta tracking using baseline offset snapshots. This mimics
>   the behavior of the hwmon PMU, allowing gauges like Temperature to be
>   reported instantaneously in `perf stat -I`, while standard counters
>   correctly accumulate deltas.
> - Robust handling of cross-architecture endianness when reading 128-bit and
>   64-bit fields from the NVMe specification.

Can you please show actual output so that we can understand what you're
doing?

Thanks,
Namhyung

> 
> The series is broken down into:
> 1. Adding the libnvme feature detection via pkg-config in tools/build.
> 2. The core implementation of the NVMe tool PMU.
> 3. A unit test suite verifying the parsing and encoding of the NVMe PMU
>    events using a mocked device.
> 
> Ian Rogers (3):
>   perf build: Add libnvme feature detection
>   perf pmu: Implement tool-provided NVMe PMU
>   perf tests: Add NVMe PMU event parsing test
> 
>  tools/build/Makefile.feature       |   2 +
>  tools/build/feature/Makefile       |   3 +
>  tools/build/feature/test-libnvme.c |  11 +
>  tools/perf/Makefile.config         |  12 +
>  tools/perf/tests/Build             |   1 +
>  tools/perf/tests/builtin-test.c    |   1 +
>  tools/perf/tests/nvme_pmu.c        | 176 ++++++++++
>  tools/perf/tests/tests.h           |   1 +
>  tools/perf/util/Build              |   1 +
>  tools/perf/util/evsel.c            |  11 +-
>  tools/perf/util/nvme_pmu.c         | 535 +++++++++++++++++++++++++++++
>  tools/perf/util/nvme_pmu.h         | 143 ++++++++
>  tools/perf/util/pmu.c              |  15 +
>  tools/perf/util/pmu.h              |   8 +-
>  tools/perf/util/pmus.c             |  31 +-
>  tools/perf/util/pmus.h             |   1 +
>  16 files changed, 945 insertions(+), 7 deletions(-)
>  create mode 100644 tools/build/feature/test-libnvme.c
>  create mode 100644 tools/perf/tests/nvme_pmu.c
>  create mode 100644 tools/perf/util/nvme_pmu.c
>  create mode 100644 tools/perf/util/nvme_pmu.h
> 
> -- 
> 2.54.0.1064.gd145956f57-goog
>