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Commit 3d7c27b6 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
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perf script: Add support to display lost events 



Adding option to display lost events:

  $ perf script --show-lost-events ...
   mplayer 13810 [002] 468011.402396:        100 cycles:ppp:  ff..
   mplayer 13810 [002] 468011.402396: PERF_RECORD_LOST lost 3880
   mplayer 13810 [002] 468011.402397:        100 cycles:ppp:  ff..

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180107160356.28203-10-jolsa@kernel.org


[ Use PRIu64 when printing u64 values, fixing the build in some arches ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 28a0b398

tools/perf/Documentation/perf-script.txt

+3 −0
Original line number Diff line number Diff line
@@ -300,6 +300,9 @@ OPTIONS 
	Display context switch events i.e. events of type PERF_RECORD_SWITCH or

	PERF_RECORD_SWITCH_CPU_WIDE.



--show-lost-events

	Display lost events i.e. events of type PERF_RECORD_LOST.



--demangle::

	Demangle symbol names to human readable form. It's enabled by default,

	disable with --no-demangle.

tools/perf/builtin-script.c

+28 −0
Original line number Diff line number Diff line
@@ -1489,6 +1489,7 @@ struct perf_script { 
	bool			show_mmap_events;

	bool			show_switch_events;

	bool			show_namespace_events;

	bool			show_lost_events;

	bool			allocated;

	bool			per_event_dump;

	struct cpu_map		*cpus;
@@ -2080,6 +2081,29 @@ static int process_switch_event(struct perf_tool *tool, 
	return 0;

}



static int

process_lost_event(struct perf_tool *tool,

		   union perf_event *event,

		   struct perf_sample *sample,

		   struct machine *machine)

{

	struct perf_script *script = container_of(tool, struct perf_script, tool);

	struct perf_session *session = script->session;

	struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);

	struct thread *thread;



	thread = machine__findnew_thread(machine, sample->pid,

					 sample->tid);

	if (thread == NULL)

		return -1;



	perf_sample__fprintf_start(sample, thread, evsel,

				   PERF_RECORD_LOST, stdout);

	perf_event__fprintf(event, stdout);

	thread__put(thread);

	return 0;

}



static void sig_handler(int sig __maybe_unused)

{

	session_done = 1;
@@ -2174,6 +2198,8 @@ static int __cmd_script(struct perf_script *script) 
		script->tool.context_switch = process_switch_event;

	if (script->show_namespace_events)

		script->tool.namespaces = process_namespaces_event;

	if (script->show_lost_events)

		script->tool.lost = process_lost_event;



	if (perf_script__setup_per_event_dump(script)) {

		pr_err("Couldn't create the per event dump files\n");
@@ -3110,6 +3136,8 @@ int cmd_script(int argc, const char **argv) 
		    "Show context switch events (if recorded)"),

	OPT_BOOLEAN('\0', "show-namespace-events", &script.show_namespace_events,

		    "Show namespace events (if recorded)"),

	OPT_BOOLEAN('\0', "show-lost-events", &script.show_lost_events,

		    "Show lost events (if recorded)"),

	OPT_BOOLEAN('\0', "per-event-dump", &script.per_event_dump,

		    "Dump trace output to files named by the monitored events"),

	OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),

tools/perf/util/event.c

+8 −0
Original line number Diff line number Diff line
@@ -1435,6 +1435,11 @@ size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp) 
		       event->context_switch.next_prev_tid);

}



static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)

{

	return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);

}



size_t perf_event__fprintf(union perf_event *event, FILE *fp)

{

	size_t ret = fprintf(fp, "PERF_RECORD_%s",
@@ -1467,6 +1472,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp) 
	case PERF_RECORD_SWITCH_CPU_WIDE:

		ret += perf_event__fprintf_switch(event, fp);

		break;

	case PERF_RECORD_LOST:

		ret += perf_event__fprintf_lost(event, fp);

		break;

	default:

		ret += fprintf(fp, "\n");

	}