linux-kernel - [PATCH v3 0/7] perf python: Add missing infra pieces for counting

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Message-ID: <20250519195148.1708988-1-irogers@google.com>
Date: Mon, 19 May 2025 12:51:37 -0700
From: Ian Rogers <irogers@...gle.com>
To: Gautam Menghani <gautam@...ux.ibm.com>, 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>, Howard Chu <howardchu95@...il.com>, 
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc: maddy@...ux.ibm.com
Subject: [PATCH v3 0/7] perf python: Add missing infra pieces for counting

Add the missing infra code in the perf python bindings for measuring and
reading the counter values for the given perf event. Demonstrate the
usage of this with counting.py - a python version of counting.c

Ian v2 -> v3:
1. Make the read API use CPUs and threads rather than indices as
   discussed in:
https://lore.kernel.org/linux-perf-users/20250512055748.479786-1-gautam@linux.ibm.com/
2. Add python cpus and threads functions to evsel so that these can be
   iterated to avoid reading CPUs not present on a parsed evsel.
3. Clean up bits of the perf_thread_map libperf API.
3. Allow a command line event to be specified for parsing, for example:
```
$ tools/perf/python/counting.py -e data_read
For evsel(uncore_imc_free_running_0/data_read/) val: 23062 enable: 1612523 run: 1612523
For evsel(uncore_imc_free_running_1/data_read/) val: 22423 enable: 1599354 run: 1599354
```

Gautam v1 -> v2:
1. Use the existing iteration support for evlist
2. Drop the use of next method
3. Use existing helper functions for python example

Gautam Menghani (4):
  perf python: Add support for perf_counts_values to return counter data
  perf python: Add evsel read method
  perf python: Add evlist close support
  perf python: Add counting.py as example for counting perf events

Ian Rogers (3):
  libperf threadmap: Don't segv for index 0 for the NULL perf_thread_map
  libperf threadmap: Add perf_thread_map__idx
  perf python: Add evsel cpus and threads functions

 tools/lib/perf/include/perf/threadmap.h |   1 +
 tools/lib/perf/threadmap.c              |  17 +++
 tools/perf/python/counting.py           |  36 +++++
 tools/perf/util/python.c                | 178 +++++++++++++++++++++++-
 4 files changed, 231 insertions(+), 1 deletion(-)
 create mode 100755 tools/perf/python/counting.py

-- 
2.49.0.1101.gccaa498523-goog