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

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Message-ID: <8568a3c6-00c9-4801-b710-e70cc06e021b@intel.com>
Date: Tue, 23 Jan 2024 13:04:49 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Ben Gainey <ben.gainey@....com>, 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, will@...nel.org
Subject: Re: [PATCH 1/1] tools: perf: Expose sample ID / stream ID to python
 scripts

On 23/01/24 12:31, Ben Gainey wrote:
> perf script exposes the evsel_name to python scripts as part of the data
> passed to the sample or tracepoint handler function, and it passes the id and
> stream_id to the throttled/unthrottled handler functions. This makes matching
> throttle events and samples difficult.
> 
> To make this possible, this change exposes the sample id and stream_id values
> to the script.
> 
> Signed-off-by: Ben Gainey <ben.gainey@....com>
> ---
>  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(-)
> 
> diff --git a/tools/perf/Documentation/perf-script-python.txt b/tools/perf/Documentation/perf-script-python.txt
> index 6a8581012e162..13e37e9385ee4 100644
> --- a/tools/perf/Documentation/perf-script-python.txt
> +++ b/tools/perf/Documentation/perf-script-python.txt
> @@ -642,8 +642,8 @@ SUPPORTED FIELDS
>  
>  Currently supported fields:
>  
> -ev_name, comm, pid, tid, cpu, ip, time, period, phys_addr, addr,
> -symbol, symoff, dso, time_enabled, time_running, values, callchain,
> +ev_name, comm, id, stream_id, pid, tid, cpu, ip, time, period, phys_addr,
> +addr, symbol, symoff, dso, time_enabled, time_running, values, callchain,
>  brstack, brstacksym, datasrc, datasrc_decode, iregs, uregs,
>  weight, transaction, raw_buf, attr, cpumode.
>  
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index 860e1837ba969..d88966645b2f4 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -858,6 +858,10 @@ static PyObject *get_perf_sample_dict(struct perf_sample *sample,
>  	pydict_set_item_string_decref(dict, "ev_name", _PyUnicode_FromString(evsel__name(evsel)));
>  	pydict_set_item_string_decref(dict, "attr", _PyBytes_FromStringAndSize((const char *)&evsel->core.attr, sizeof(evsel->core.attr)));
>  
> +	pydict_set_item_string_decref(dict_sample, "id",
> +			PyLong_FromUnsignedLongLong(sample->id));
> +	pydict_set_item_string_decref(dict_sample, "stream_id",
> +			PyLong_FromUnsignedLongLong(sample->stream_id));
>  	pydict_set_item_string_decref(dict_sample, "pid",
>  			_PyLong_FromLong(sample->pid));
>  	pydict_set_item_string_decref(dict_sample, "tid",
> @@ -1306,7 +1310,7 @@ static void python_export_sample_table(struct db_export *dbe,
>  	struct tables *tables = container_of(dbe, struct tables, dbe);
>  	PyObject *t;
>  
> -	t = tuple_new(25);
> +	t = tuple_new(27);
>  
>  	tuple_set_d64(t, 0, es->db_id);
>  	tuple_set_d64(t, 1, es->evsel->db_id);
> @@ -1333,6 +1337,8 @@ static void python_export_sample_table(struct db_export *dbe,
>  	tuple_set_d64(t, 22, es->sample->insn_cnt);
>  	tuple_set_d64(t, 23, es->sample->cyc_cnt);
>  	tuple_set_s32(t, 24, es->sample->flags);
> +	tuple_set_d64(t, 25, es->sample->id);
> +	tuple_set_d64(t, 26, es->sample->stream_id);

Unless you actually plan to use the db_export interface with
these, there is no need to add them at this time.

>  
>  	call_object(tables->sample_handler, t, "sample_table");
>