perf annotate: Move nr_events struct to 'struct annotated_source'

It's only used in 'perf annotate' output which means functions with actual
samples.  No need to consume memory for every symbol ('struct annotation').
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240404175716.1225482-9-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/annotate.c

@@ -1584,7 +1584,7 @@ static double annotation_line__max_percent(struct annotation_line *al,
 	double percent_max = 0.0;
 	int i;
 
-	for (i = 0; i < notes->nr_events; i++) {
+	for (i = 0; i < notes->src->nr_events; i++) {
 		double percent;
 
 		percent = annotation_data__percent(&al->data[i],
@@ -1674,7 +1674,7 @@ static void __annotation_line__write(struct annotation_line *al, struct annotati
 	if (al->offset != -1 && percent_max != 0.0) {
 		int i;
 
-		for (i = 0; i < notes->nr_events; i++) {
+		for (i = 0; i < notes->src->nr_events; i++) {
 			double percent;
 
 			percent = annotation_data__percent(&al->data[i], percent_type);
@@ -1846,7 +1846,7 @@ int symbol__annotate2(struct map_symbol *ms, struct evsel *evsel,
 		return err;
 
 	annotation__init_column_widths(notes, sym);
-	notes->nr_events = nr_pcnt;
+	notes->src->nr_events = nr_pcnt;
 
 	annotation__update_column_widths(notes);
 	sym->annotate2 = 1;

tools/perf/util/annotate.h

@@ -247,6 +247,7 @@ struct cyc_hist {
  * 		  to see each group separately, that is why symbol__annotate2()
  * 		  sets src->nr_histograms to evsel->nr_members.
  * @samples: Hash map of sym_hist_entry.  Keyed by event index and offset in symbol.
+ * @nr_events: Number of events in the current output.
  * @nr_entries: Number of annotated_line in the source list.
  * @nr_asm_entries: Number of annotated_line with actual asm instruction in the
  * 		    source list.
@@ -265,6 +266,7 @@ struct annotated_source {
 	struct sym_hist		*histograms;
 	struct hashmap	   	*samples;
 	int    			nr_histograms;
+	int    			nr_events;
 	int			nr_entries;
 	int			nr_asm_entries;
 	int			max_jump_sources;
@@ -311,7 +313,6 @@ struct annotated_branch {
 
 struct LOCKABLE annotation {
 	u64			start;
-	int			nr_events;
 	struct annotated_source *src;
 	struct annotated_branch *branch;
 };
@@ -335,7 +336,7 @@ static inline int annotation__cycles_width(struct annotation *notes)
 
 static inline int annotation__pcnt_width(struct annotation *notes)
 {
-	return (symbol_conf.show_total_period ? 12 : 7) * notes->nr_events;
+	return (symbol_conf.show_total_period ? 12 : 7) * notes->src->nr_events;
 }
 
 static inline bool annotation_line__filter(struct annotation_line *al)