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Date: Wed, 6 Jan 2016 09:00:31 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
CC: Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Jiri Olsa <jolsa@...nel.org>,
LKML <linux-kernel@...r.kernel.org>,
David Ahern <dsahern@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH v2 5/5] perf evlist: Add -T/--trace option to show trace
fields
On Tue, Jan 05, 2016 at 07:23:33PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jan 05, 2016 at 07:58:38PM +0900, Namhyung Kim escreveu:
> > To use dynamic sort keys, it might be good to add an option to see the
> > list of field names.
> >
> > $ perf evlist -T -i perf.data.sched
>
> Humm, I think here we should just use --trace_fields, like what appears
> in the output for each line below, and also as is the case for the '-s
> trace_fields' case, ok?
OK
>
> With:
>
> $ . ~/git/linux/tools/perf/perf-completion.sh
> [acme@zoo linux]$ perf evlist --
> --force --freq --group --input --verbose
> [acme@zoo linux]$ perf evlist --
>
> We can autocomplete it from --t<TAB> anyway :)
>
> Unsure about '-T', perhaps this is so specialized, that can remain with
> just the long option?
OK
>
> Perhaps we can add a tip, when we run:
>
> perf evlist
>
> And there are tracepoint events, something like:
>
> perf evlist -v
> sched:sched_switch ...
> # Tip use 'perf evlist --trace_fields' to show fields for events such
> # as "sched:sched_switch"
OK, it'd display this only the evlist has tracepoints. How about this oneliner?
# Tip: use 'perf evlist --trace_fields' to show fields for tracepoint events
Thanks,
Namhyung
>
> - Arnaldo
>
> > sched:sched_switch: trace_fields=prev_comm,prev_pid,prev_prio,prev_state,next_comm,next_pid,next_prio
> > sched:sched_stat_wait: trace_fields=comm,pid,delay
> > sched:sched_stat_sleep: trace_fields=comm,pid,delay
> > sched:sched_stat_iowait: trace_fields=comm,pid,delay
> > sched:sched_stat_runtime: trace_fields=comm,pid,runtime,vruntime
> > sched:sched_process_fork: trace_fields=parent_comm,parent_pid,child_comm,child_pid
> > sched:sched_wakeup: trace_fields=comm,pid,prio,success,target_cpu
> > sched:sched_wakeup_new: trace_fields=comm,pid,prio,success,target_cpu
> > sched:sched_migrate_task: trace_fields=comm,pid,prio,orig_cpu,dest_cpu
> >
> > Acked-by: Jiri Olsa <jolsa@...nel.org>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> > tools/perf/Documentation/perf-evlist.txt | 4 ++++
> > tools/perf/builtin-evlist.c | 1 +
> > tools/perf/util/evsel.c | 23 +++++++++++++++++++++++
> > tools/perf/util/evsel.h | 1 +
> > 4 files changed, 29 insertions(+)
> >
> > diff --git a/tools/perf/Documentation/perf-evlist.txt b/tools/perf/Documentation/perf-evlist.txt
> > index 1ceb3700ffbb..b0d99c276cf5 100644
> > --- a/tools/perf/Documentation/perf-evlist.txt
> > +++ b/tools/perf/Documentation/perf-evlist.txt
> > @@ -32,6 +32,10 @@ OPTIONS
> > --group::
> > Show event group information.
> >
> > +-T::
> > +--trace::
> > + Show tracepoint field names.
> > +
> > SEE ALSO
> > --------
> > linkperf:perf-record[1], linkperf:perf-list[1],
> > diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
> > index 08a7d36a2cf8..2820bb2d8cf8 100644
> > --- a/tools/perf/builtin-evlist.c
> > +++ b/tools/perf/builtin-evlist.c
> > @@ -49,6 +49,7 @@ int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
> > OPT_BOOLEAN('g', "group", &details.event_group,
> > "Show event group information"),
> > OPT_BOOLEAN('f', "force", &details.force, "don't complain, do it"),
> > + OPT_BOOLEAN('T', "trace", &details.trace, "Show tracepoint fields"),
> > OPT_END()
> > };
> > const char * const evlist_usage[] = {
> > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> > index 544e4400de13..174d0029e038 100644
> > --- a/tools/perf/util/evsel.c
> > +++ b/tools/perf/util/evsel.c
> > @@ -2298,6 +2298,29 @@ int perf_evsel__fprintf(struct perf_evsel *evsel,
> > printed += comma_fprintf(fp, &first, " %s=%" PRIu64,
> > term, (u64)evsel->attr.sample_freq);
> > }
> > +
> > + if (details->trace) {
> > + struct format_field *field;
> > +
> > + if (evsel->attr.type != PERF_TYPE_TRACEPOINT) {
> > + printed += comma_fprintf(fp, &first, " (not a tracepoint)");
> > + goto out;
> > + }
> > +
> > + field = evsel->tp_format->format.fields;
> > + if (field == NULL) {
> > + printed += comma_fprintf(fp, &first, " (no trace field)");
> > + goto out;
> > + }
> > +
> > + printed += comma_fprintf(fp, &first, " trace_fields=%s", field->name);
> > +
> > + field = field->next;
> > + while (field) {
> > + printed += comma_fprintf(fp, &first, "%s", field->name);
> > + field = field->next;
> > + }
> > + }
> > out:
> > fputc('\n', fp);
> > return ++printed;
> > diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> > index 5ded1fc0341e..9b36dd584d4a 100644
> > --- a/tools/perf/util/evsel.h
> > +++ b/tools/perf/util/evsel.h
> > @@ -369,6 +369,7 @@ struct perf_attr_details {
> > bool verbose;
> > bool event_group;
> > bool force;
> > + bool trace;
> > };
> >
> > int perf_evsel__fprintf(struct perf_evsel *evsel,
> > --
> > 2.6.4
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