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

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Date: Tue, 23 Jan 2024 11:24:04 +0000
From: Ben Gainey <Ben.Gainey@....com>
To: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "adrian.hunter@...el.com"
	<adrian.hunter@...el.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-perf-users@...r.kernel.org"
	<linux-perf-users@...r.kernel.org>
CC: "alexander.shishkin@...ux.intel.com" <alexander.shishkin@...ux.intel.com>,
	"peterz@...radead.org" <peterz@...radead.org>, "acme@...nel.org"
	<acme@...nel.org>, "mingo@...hat.com" <mingo@...hat.com>, Mark Rutland
	<Mark.Rutland@....com>, "will@...nel.org" <will@...nel.org>,
	"irogers@...gle.com" <irogers@...gle.com>, "jolsa@...nel.org"
	<jolsa@...nel.org>, "namhyung@...nel.org" <namhyung@...nel.org>
Subject: Re: [PATCH 1/1] tools: perf: Expose sample ID / stream ID to python
 scripts

On Tue, 2024-01-23 at 13:04 +0200, Adrian Hunter wrote:
> 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.
> 

For the particular script I was using the db export interface.


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