perf hist: Add symbol_conf.skip_empty

Add the skip_empty flag to symbol_conf and set the value from the report
command to preserve the existing behavior.  This makes the code simpler
and will be needed other code which is hard to add a new argument.

Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240607202918.2357459-4-namhyung@kernel.org

tools/perf/builtin-annotate.c

@@ -571,8 +571,8 @@ static int __cmd_annotate(struct perf_annotate *ann)
 		goto out;
 
 	if (dump_trace) {
-		perf_session__fprintf_nr_events(session, stdout, false);
+		perf_session__fprintf_nr_events(session, stdout);
-		evlist__fprintf_nr_events(session->evlist, stdout, false);
+		evlist__fprintf_nr_events(session->evlist, stdout);
 		goto out;
 	}
 

tools/perf/builtin-report.c

@@ -810,8 +810,8 @@ static int stats_print(struct report *rep)
 {
 	struct perf_session *session = rep->session;
 
-	perf_session__fprintf_nr_events(session, stdout, rep->skip_empty);
+	perf_session__fprintf_nr_events(session, stdout);
-	evlist__fprintf_nr_events(session->evlist, stdout, rep->skip_empty);
+	evlist__fprintf_nr_events(session->evlist, stdout);
 	return 0;
 }
 
@@ -1089,10 +1089,8 @@ static int __cmd_report(struct report *rep)
 			perf_session__fprintf_dsos(session, stdout);
 
 		if (dump_trace) {
-			perf_session__fprintf_nr_events(session, stdout,
+			perf_session__fprintf_nr_events(session, stdout);
-							rep->skip_empty);
+			evlist__fprintf_nr_events(session->evlist, stdout);
-			evlist__fprintf_nr_events(session->evlist, stdout,
-						  rep->skip_empty);
 			return 0;
 		}
 	}
@@ -1562,6 +1560,8 @@ int cmd_report(int argc, const char **argv)
 	data.path  = input_name;
 	data.force = symbol_conf.force;
 
+	symbol_conf.skip_empty = report.skip_empty;
+
 repeat:
 	session = perf_session__new(&data, &report.tool);
 	if (IS_ERR(session)) {

tools/perf/ui/stdio/hist.c

@@ -897,8 +897,7 @@ out:
 	return ret;
 }
 
-size_t events_stats__fprintf(struct events_stats *stats, FILE *fp,
+size_t events_stats__fprintf(struct events_stats *stats, FILE *fp)
-			     bool skip_empty)
 {
 	int i;
 	size_t ret = 0;
@@ -910,7 +909,7 @@ size_t events_stats__fprintf(struct events_stats *stats, FILE *fp,
 		name = perf_event__name(i);
 		if (!strcmp(name, "UNKNOWN"))
 			continue;
-		if (skip_empty && !stats->nr_events[i])
+		if (symbol_conf.skip_empty && !stats->nr_events[i])
 			continue;
 
 		if (i && total) {

tools/perf/util/events_stats.h

@@ -52,7 +52,6 @@ struct hists_stats {
 
 void events_stats__inc(struct events_stats *stats, u32 type);
 
-size_t events_stats__fprintf(struct events_stats *stats, FILE *fp,
+size_t events_stats__fprintf(struct events_stats *stats, FILE *fp);
-			     bool skip_empty);
 
 #endif /* __PERF_EVENTS_STATS_ */

tools/perf/util/hist.c

@@ -2706,8 +2706,7 @@ void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
 	}
 }
 
-size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp,
+size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp)
-				 bool skip_empty)
 {
 	struct evsel *pos;
 	size_t ret = 0;
@@ -2715,7 +2714,8 @@ size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp,
 	evlist__for_each_entry(evlist, pos) {
 		struct hists *hists = evsel__hists(pos);
 
-		if (skip_empty && !hists->stats.nr_samples && !hists->stats.nr_lost_samples)
+		if (symbol_conf.skip_empty && !hists->stats.nr_samples &&
+		    !hists->stats.nr_lost_samples)
 			continue;
 
 		ret += fprintf(fp, "%s stats:\n", evsel__name(pos));

tools/perf/util/hist.h

@@ -375,8 +375,7 @@ void hists__inc_nr_lost_samples(struct hists *hists, u32 lost);
 size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
 		      int max_cols, float min_pcnt, FILE *fp,
 		      bool ignore_callchains);
-size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp,
+size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp);
-				 bool skip_empty);
 
 void hists__filter_by_dso(struct hists *hists);
 void hists__filter_by_thread(struct hists *hists);

tools/perf/util/session.c

@@ -2696,8 +2696,7 @@ size_t perf_session__fprintf_dsos_buildid(struct perf_session *session, FILE *fp
 	return machines__fprintf_dsos_buildid(&session->machines, fp, skip, parm);
 }
 
-size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp,
+size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
-				       bool skip_empty)
 {
 	size_t ret;
 	const char *msg = "";
@@ -2707,7 +2706,7 @@ size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp,
 
 	ret = fprintf(fp, "\nAggregated stats:%s\n", msg);
 
-	ret += events_stats__fprintf(&session->evlist->stats, fp, skip_empty);
+	ret += events_stats__fprintf(&session->evlist->stats, fp);
 	return ret;
 }
 

tools/perf/util/session.h

@@ -130,8 +130,7 @@ size_t perf_session__fprintf_dsos(struct perf_session *session, FILE *fp);
 size_t perf_session__fprintf_dsos_buildid(struct perf_session *session, FILE *fp,
 					  bool (fn)(struct dso *dso, int parm), int parm);
 
-size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp,
+size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp);
-				       bool skip_empty);
 
 void perf_session__dump_kmaps(struct perf_session *session);
 

tools/perf/util/symbol_conf.h

@@ -46,7 +46,8 @@ struct symbol_conf {
 			lazy_load_kernel_maps,
 			keep_exited_threads,
 			annotate_data_member,
-			annotate_data_sample;
+			annotate_data_sample,
+			skip_empty;
 	const char	*vmlinux_name,
 			*kallsyms_name,
 			*source_prefix,