perf tools: Add stat round user level event

Adding the stat round event to be stored after each stat interval round,
so that report tools (report/script) gets notified and process interval
data.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-18-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/event.c

@@ -43,6 +43,7 @@ static const char *perf_event__names[] = {
 	[PERF_RECORD_CPU_MAP]			= "CPU_MAP",
 	[PERF_RECORD_STAT_CONFIG]		= "STAT_CONFIG",
 	[PERF_RECORD_STAT]			= "STAT",
+	[PERF_RECORD_STAT_ROUND]		= "STAT_ROUND",
 };
 
 const char *perf_event__name(unsigned int id)

tools/perf/util/event.h

@@ -230,6 +230,7 @@ enum perf_user_event_type { /* above any possible kernel type */
 	PERF_RECORD_CPU_MAP			= 74,
 	PERF_RECORD_STAT_CONFIG			= 75,
 	PERF_RECORD_STAT			= 76,
+	PERF_RECORD_STAT_ROUND			= 77,
 	PERF_RECORD_HEADER_MAX
 };
 
@@ -432,6 +433,17 @@ struct stat_event {
 	};
 };
 
+enum {
+	PERF_STAT_ROUND_TYPE__INTERVAL	= 0,
+	PERF_STAT_ROUND_TYPE__FINAL	= 1,
+};
+
+struct stat_round_event {
+	struct perf_event_header	header;
+	u64				type;
+	u64				time;
+};
+
 union perf_event {
 	struct perf_event_header	header;
 	struct mmap_event		mmap;
@@ -458,6 +470,7 @@ union perf_event {
 	struct cpu_map_event		cpu_map;
 	struct stat_config_event	stat_config;
 	struct stat_event		stat;
+	struct stat_round_event		stat_round;
 };
 
 void perf_event__print_totals(void);

tools/perf/util/session.c

@@ -333,6 +333,15 @@ static int process_stat_stub(struct perf_tool *tool __maybe_unused,
 	return 0;
 }
 
+static int process_stat_round_stub(struct perf_tool *tool __maybe_unused,
+				   union perf_event *event __maybe_unused,
+				   struct perf_session *perf_session
+				   __maybe_unused)
+{
+	dump_printf(": unhandled!\n");
+	return 0;
+}
+
 void perf_tool__fill_defaults(struct perf_tool *tool)
 {
 	if (tool->sample == NULL)
@@ -391,6 +400,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
 		tool->stat_config = process_event_stat_config_stub;
 	if (tool->stat == NULL)
 		tool->stat = process_stat_stub;
+	if (tool->stat_round == NULL)
+		tool->stat_round = process_stat_round_stub;
 }
 
 static void swap_sample_id_all(union perf_event *event, void *data)
@@ -729,6 +740,13 @@ static void perf_event__stat_swap(union perf_event *event,
 	event->stat.run    = bswap_64(event->stat.run);
 }
 
+static void perf_event__stat_round_swap(union perf_event *event,
+					bool sample_id_all __maybe_unused)
+{
+	event->stat_round.type = bswap_64(event->stat_round.type);
+	event->stat_round.time = bswap_64(event->stat_round.time);
+}
+
 typedef void (*perf_event__swap_op)(union perf_event *event,
 				    bool sample_id_all);
 
@@ -760,6 +778,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
 	[PERF_RECORD_CPU_MAP]		  = perf_event__cpu_map_swap,
 	[PERF_RECORD_STAT_CONFIG]	  = perf_event__stat_config_swap,
 	[PERF_RECORD_STAT]		  = perf_event__stat_swap,
+	[PERF_RECORD_STAT_ROUND]	  = perf_event__stat_round_swap,
 	[PERF_RECORD_HEADER_MAX]	  = NULL,
 };
 
@@ -1304,6 +1323,8 @@ static s64 perf_session__process_user_event(struct perf_session *session,
 		return tool->stat_config(tool, event, session);
 	case PERF_RECORD_STAT:
 		return tool->stat(tool, event, session);
+	case PERF_RECORD_STAT_ROUND:
+		return tool->stat_round(tool, event, session);
 	default:
 		return -EINVAL;
 	}

tools/perf/util/tool.h

@@ -59,7 +59,8 @@ struct perf_tool {
 			thread_map,
 			cpu_map,
 			stat_config,
-			stat;
+			stat,
+			stat_round;
 	event_op3	auxtrace;
 	bool		ordered_events;
 	bool		ordering_requires_timestamps;