[PATCH v3 0/4] Add support for a DRM tool like PMU

[Ian Rogers]

On Thu, Apr 3, 2025 at 1:24 PM Ian Rogers <irogers at google.com> wrote:
>
> DRM clients expose information through usage stats as documented in
> Documentation/gpu/drm-usage-stats.rst (available online at
> https://docs.kernel.org/gpu/drm-usage-stats.html). Add a tool like
> PMU, similar to the hwmon PMU, that exposes DRM information.

I'm reminded by Brendan Gregg's new blog:
https://www.brendangregg.com/blog/2025-05-01/doom-gpu-flame-graphs.html
that this is still outstanding. The patches also reduce some directory
scanning for the hwmon "PMU", they are in Google's tree:
https://github.com/googleprodkernel/linux-perf/blob/google_tools_master/tools/perf/util/drm_pmu.c

Thanks,
Ian

> v3: Minor tweak to the test so the skip (exit 2) doesn't trigger the
>     trap cleanup.
>
> v2: Add support to only scan hwmon and drm PMUs if the event or PMU
> wildcard can match. Add a test as requested by Namhyung. Add file
> comments.
>
> v1:
> https://lore.kernel.org/lkml/20250211071727.364389-1-irogers@google.com/
>
> Ian Rogers (4):
>   perf parse-events: Avoid scanning PMUs that can't contain events
>   perf parse-events: Avoid scanning PMUs that can't match a wildcard
>   perf drm_pmu: Add a tool like PMU to expose DRM information
>   perf tests: Add a DRM PMU test
>
>  tools/perf/tests/shell/drm_pmu.sh |  78 ++++
>  tools/perf/util/Build             |   1 +
>  tools/perf/util/drm_pmu.c         | 689 ++++++++++++++++++++++++++++++
>  tools/perf/util/drm_pmu.h         |  39 ++
>  tools/perf/util/evsel.c           |   9 +
>  tools/perf/util/parse-events.c    |  30 +-
>  tools/perf/util/pmu.c             |  15 +
>  tools/perf/util/pmu.h             |   4 +-
>  tools/perf/util/pmus.c            | 101 ++++-
>  tools/perf/util/pmus.h            |   2 +
>  10 files changed, 952 insertions(+), 16 deletions(-)
>  create mode 100755 tools/perf/tests/shell/drm_pmu.sh
>  create mode 100644 tools/perf/util/drm_pmu.c
>  create mode 100644 tools/perf/util/drm_pmu.h
>
> --
> 2.49.0.504.g3bcea36a83-goog
>