Messages in this thread | | | Date | Thu, 7 Jan 2016 08:21:44 +0900 | From | Namhyung Kim <> | Subject | Re: [PATCH v3 5/5] perf evlist: Add --trace-fields option to show trace fields |
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On Wed, Jan 06, 2016 at 08:10:51PM -0300, Arnaldo Carvalho de Melo wrote: > Em Wed, Jan 06, 2016 at 09:55:01AM +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 -i perf.data.sched > > sched:sched_switch > > sched:sched_stat_wait > > sched:sched_stat_sleep > > sched:sched_stat_iowait > > sched:sched_stat_runtime > > sched:sched_process_fork > > sched:sched_wakeup > > sched:sched_wakeup_new > > sched:sched_migrate_task > > # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events > > Ok, almost there, question is: if I ask explicitely for > "--trace-fields", why should we have the "trace_fields=" in all lines, > instead of just: > > > $ perf evlist -i perf.data.sched --trace-fields > sched:sched_switch: prev_comm,prev_pid,prev_prio,prev_state,next_comm,next_pid,next_prio > sched:sched_stat_wait: comm,pid,delay > > ?
I made it to work with other options too, like 'perf evlist --freq --trace-fields'. In that case you may want to see it. :)
Thanks, Namhyung
> > I like the lack of spaces after commans, this way we can double click > and select the whole list, then edit it, etc. > > - Arnaldo > > > $ perf evlist -i perf.data.sched --trace-fields > > 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 > > > > Signed-off-by: Namhyung Kim <namhyung@kernel.org> > > --- > > tools/perf/Documentation/perf-evlist.txt | 3 +++ > > tools/perf/builtin-evlist.c | 11 ++++++++++- > > tools/perf/util/evsel.c | 23 +++++++++++++++++++++++ > > tools/perf/util/evsel.h | 1 + > > 4 files changed, 37 insertions(+), 1 deletion(-) > > > > diff --git a/tools/perf/Documentation/perf-evlist.txt b/tools/perf/Documentation/perf-evlist.txt > > index 1ceb3700ffbb..6f7200fb85cf 100644 > > --- a/tools/perf/Documentation/perf-evlist.txt > > +++ b/tools/perf/Documentation/perf-evlist.txt > > @@ -32,6 +32,9 @@ OPTIONS > > --group:: > > Show event group information. > > > > +--trace-fields:: > > + 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..8a31f511e1a0 100644 > > --- a/tools/perf/builtin-evlist.c > > +++ b/tools/perf/builtin-evlist.c > > @@ -26,14 +26,22 @@ static int __cmd_evlist(const char *file_name, struct perf_attr_details *details > > .mode = PERF_DATA_MODE_READ, > > .force = details->force, > > }; > > + bool has_tracepoint = false; > > > > session = perf_session__new(&file, 0, NULL); > > if (session == NULL) > > return -1; > > > > - evlist__for_each(session->evlist, pos) > > + evlist__for_each(session->evlist, pos) { > > perf_evsel__fprintf(pos, details, stdout); > > > > + if (pos->attr.type == PERF_TYPE_TRACEPOINT) > > + has_tracepoint = true; > > + } > > + > > + if (has_tracepoint && !details->trace_fields) > > + printf("# Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events\n"); > > + > > perf_session__delete(session); > > return 0; > > } > > @@ -49,6 +57,7 @@ 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(0, "trace-fields", &details.trace_fields, "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..b7822c98fcca 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_fields) { > > + 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..8e75434bd01c 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_fields; > > }; > > > > int perf_evsel__fprintf(struct perf_evsel *evsel, > > -- > > 2.6.4
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