linux-kernel - Re: [PATCH v3 0/4] Add support for a DRM tool like PMU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAP-5=fXkayZ7pj+EctOtSBiTcGuyi6SHm9c5RZ3HyyPYcot9zA@mail.gmail.com>
Date: Wed, 30 Apr 2025 08:21:59 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, James Clark <james.clark@...aro.org>, 
	Weilin Wang <weilin.wang@...el.com>, Dominique Martinet <asmadeus@...ewreck.org>, 
	Thomas Richter <tmricht@...ux.ibm.com>, Junhao He <hejunhao3@...wei.com>, 
	Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, Brendan Gregg <brendan@...el.com>, 
	gabriel.munoz@...el.com, matthew.olson@...el.com, 
	brandon.kammerdiener@...el.com
Cc: dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v3 0/4] Add support for a DRM tool like PMU

On Thu, Apr 3, 2025 at 1:24 PM Ian Rogers <irogers@...gle.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
>