[PATCH 2/4] perf tools: Add perf_event__synthesize_{start,stop}()

[Namhyung Kim]

These functions are to prepare and cleanup necessary work for synthesizing.
It doesn't do anything yet but later patch will add it.

Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/builtin-inject.c        | 3 +++
 tools/perf/builtin-record.c        | 3 +++
 tools/perf/builtin-stat.c          | 2 ++
 tools/perf/builtin-top.c           | 4 ++++
 tools/perf/util/auxtrace.c         | 2 ++
 tools/perf/util/synthetic-events.c | 8 ++++++++
 tools/perf/util/synthetic-events.h | 3 +++
 7 files changed, 25 insertions(+)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index e254f18986f7..2e91a887919b 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -2368,9 +2368,12 @@ int cmd_inject(int argc, const char **argv)
 	if (ret < 0)
 		goto out_delete;
 
+	perf_event__synthesize_start();
+
 	ret = __cmd_inject(&inject);
 
 	guest_session__exit(&inject.guest_session);
+	perf_event__synthesize_stop();
 
 out_delete:
 	strlist__delete(inject.known_build_ids);
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 02e38f50a138..5b7b9ad2a280 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1966,6 +1966,8 @@ static int record__synthesize(struct record *rec, bool tail)
 	if (rec->opts.tail_synthesize != tail)
 		return 0;
 
+	perf_event__synthesize_start();
+
 	if (data->is_pipe) {
 		err = perf_event__synthesize_for_pipe(tool, session, data,
 						      process_synthesized_event);
@@ -2072,6 +2074,7 @@ static int record__synthesize(struct record *rec, bool tail)
 	}
 
 out:
+	perf_event__synthesize_stop();
 	return err;
 }
 
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index e05fe72c1d87..f6f61e08f4c2 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -962,6 +962,7 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 		if (err < 0)
 			return err;
 
+		perf_event__synthesize_start();
 		err = perf_event__synthesize_stat_events(&stat_config, NULL, evsel_list,
 							 process_synthesized_event, is_pipe);
 		if (err < 0)
@@ -2641,6 +2642,7 @@ int cmd_stat(int argc, const char **argv)
 			perf_session__write_header(perf_stat.session, evsel_list, fd, true);
 		}
 
+		perf_event__synthesize_stop();
 		evlist__close(evsel_list);
 		perf_session__delete(perf_stat.session);
 	}
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index e89208b4ad4b..1eff894e6b5f 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1258,6 +1258,8 @@ static int __cmd_top(struct perf_top *top)
 #endif
 	}
 
+	perf_event__synthesize_start();
+
 	ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
 						&top->session->machines.host,
 						&top->record_opts);
@@ -1273,6 +1275,8 @@ static int __cmd_top(struct perf_top *top)
 				    top->evlist->core.threads, true, false,
 				    top->nr_threads_synthesize);
 
+	perf_event__synthesize_stop();
+
 	if (top->nr_threads_synthesize > 1)
 		perf_set_singlethreaded();
 
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index b59c278fe9ed..1bfe076c22fb 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -1328,6 +1328,7 @@ int perf_event__process_auxtrace_info(struct perf_session *session,
 	if (err)
 		return err;
 
+	perf_event__synthesize_start();
 	unleader_auxtrace(session);
 
 	return 0;
@@ -2834,6 +2835,7 @@ void auxtrace__free(struct perf_session *session)
 	if (!session->auxtrace)
 		return;
 
+	perf_event__synthesize_stop();
 	return session->auxtrace->free(session);
 }
 
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 0ff57ca24577..9d4f5dacd154 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -47,6 +47,14 @@
 
 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
 
+void perf_event__synthesize_start(void)
+{
+}
+
+void perf_event__synthesize_stop(void)
+{
+}
+
 int perf_tool__process_synth_event(struct perf_tool *tool,
 				   union perf_event *event,
 				   struct machine *machine,
diff --git a/tools/perf/util/synthetic-events.h b/tools/perf/util/synthetic-events.h
index 53737d1619a4..e4414616080c 100644
--- a/tools/perf/util/synthetic-events.h
+++ b/tools/perf/util/synthetic-events.h
@@ -43,6 +43,9 @@ int parse_synth_opt(char *str);
 typedef int (*perf_event__handler_t)(struct perf_tool *tool, union perf_event *event,
 				     struct perf_sample *sample, struct machine *machine);
 
+void perf_event__synthesize_start(void);
+void perf_event__synthesize_stop(void);
+
 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist, perf_event__handler_t process);
 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr, u32 ids, u64 *id, perf_event__handler_t process);
 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc, perf_event__handler_t process, struct machine *machine);
-- 
2.37.3.968.ga6b4b080e4-goog