[PATCH v2 5/5] perf evlist: Add -T/--trace option to show trace fields

[Namhyung Kim <namhyung@kernel.org>]

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
  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@kernel.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.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