perf: Report lost events in perf trace debug mode (ffabd99e) · Commits · 戴 / test

tools/perf/builtin-trace.c

+17 −5

Original line number	Diff line number	Diff line
		@@ -11,7 +11,7 @@

		static char const *script_name;
		static char const *generate_script_lang;
		static bool debug_ordering;
		static bool debug_mode;
		static u64 last_timestamp;
		static u64 nr_unordered;

		@@ -92,7 +92,7 @@ static int process_sample_event(event_t event, struct perf_session session)
		}

		if (session->sample_type & PERF_SAMPLE_RAW) {
		if (debug_ordering) {
		if (debug_mode) {
		if (data.time < last_timestamp) {
		pr_err("Samples misordered, previous: %llu "
		"this: %llu\n", last_timestamp,
		@@ -116,6 +116,15 @@ static int process_sample_event(event_t event, struct perf_session session)
		return 0;
		}

		static u64 nr_lost;

		static int process_lost_event(event_t event, struct perf_session session __used)
		{
		nr_lost += event->lost.lost;

		return 0;
		}

		static struct perf_event_ops event_ops = {
		.sample = process_sample_event,
		.comm = event__process_comm,
		@@ -123,6 +132,7 @@ static struct perf_event_ops event_ops = {
		.event_type = event__process_event_type,
		.tracing_data = event__process_tracing_data,
		.build_id = event__process_build_id,
		.lost = process_lost_event,
		.ordered_samples = true,
		};

		@@ -141,8 +151,10 @@ static int __cmd_trace(struct perf_session *session)

		ret = perf_session__process_events(session, &event_ops);

		if (debug_ordering)
		if (debug_mode) {
		pr_err("Misordered timestamps: %llu\n", nr_unordered);
		pr_err("Lost events: %llu\n", nr_lost);
		}

		return ret;
		}
		@@ -554,8 +566,8 @@ static const struct option options[] = {
		"generate perf-trace.xx script in specified language"),
		OPT_STRING('i', "input", &input_name, "file",
		"input file name"),
		OPT_BOOLEAN('d', "debug-ordering", &debug_ordering,
		"check that samples time ordering is monotonic"),
		OPT_BOOLEAN('d', "debug-mode", &debug_mode,
		"do various checks like samples ordering and lost events"),

		OPT_END()
		};

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