perf evlist: Add --trace-fields option to show trace fields (775d8a1b) · Commits · 戴 / test

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 $ 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 Committer notes: For another file, in verbose mode: # perf evlist -v --trace-fields sched:sched_switch: type: 2, size: 112, config: 0x10b, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW, disabled: 1, inherit: 1, mmap: 1, comm: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1, trace_fields: prev_comm,prev_pid,prev_prio,prev_state,next_comm,next_pid,next_prio # Signed-off-by:

Namhyung Kim <namhyung@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1452125549-1511-5-git-send-email-namhyung@kernel.org [ Replaced 'trace_fields=' with 'trace_fields: ' to make the output consistent in -v mode ] Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-evlist.txt

+3 −0

Original line number	Diff line number	Diff line
		@@ -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],

tools/perf/builtin-evlist.c

+10 −1

Original line number	Diff line number	Diff line
		@@ -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[] = {

tools/perf/util/evsel.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -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;

tools/perf/util/evsel.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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,

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