linux-kernel - [PATCH 0/1] tools: perf: Expose sample ID / stream ID to python scripts

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Date: Tue, 23 Jan 2024 10:31:36 +0000
From: Ben Gainey <ben.gainey@....com>
To: linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	namhyung@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	will@...nel.org,
	Ben Gainey <ben.gainey@....com>
Subject: [PATCH 0/1] tools: perf: Expose sample ID / stream ID to python scripts

This patch modifies the perf python scripting engine so that the ID and
STREAM_ID are exposed as part of the sample so that they may be
correlated to the corresponding throttle/unthrottle event (for example).

NB: For scripts where perf_db_export_mode = True, this may be a breaking
change depending on how the script is constructed. Each field is passed
to `sample_table` as an argument so any script that is written as:

    def sample_table(db_id, evsel_id, machine_id, ..., cyc_cnt, flags)

will now fail due to the changed number of arguments with:

    TypeError: sample_table() takes 25 positional arguments but 27 were given

Scripts that use:

    def sample_table(*args)

or some variation thereof will not be affected.

When `perf_db_export_mode = False`, the script should be unaffected as
all the arguments are inserted into a dictionary.

The export-to-xxx.py scripts use the (..., *x) form so are not affected.

Ben Gainey (1):
  tools: perf: Expose sample ID / stream ID to python scripts

 tools/perf/Documentation/perf-script-python.txt        | 4 ++--
 tools/perf/util/scripting-engines/trace-event-python.c | 8 +++++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

-- 
2.43.0