perf tools: Keep group information

Add a few of group-related field in struct perf_{evlist,evsel} so that
the group information in a evlist can be known easily.  It only counts
groups which have more than 1 members since leader-only groups are
treated as non-group events.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1358845787-1350-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evlist.c

@@ -117,6 +117,9 @@ void __perf_evlist__set_leader(struct list_head *list)
 	struct perf_evsel *evsel, *leader;
 
 	leader = list_entry(list->next, struct perf_evsel, node);
+	evsel = list_entry(list->prev, struct perf_evsel, node);
+
+	leader->nr_members = evsel->idx - leader->idx + 1;
 
 	list_for_each_entry(evsel, list, node) {
 		if (evsel != leader)
@@ -126,8 +129,10 @@ void __perf_evlist__set_leader(struct list_head *list)
 
 void perf_evlist__set_leader(struct perf_evlist *evlist)
 {
-	if (evlist->nr_entries)
+	if (evlist->nr_entries) {
+		evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
 		__perf_evlist__set_leader(&evlist->entries);
+	}
 }
 
 int perf_evlist__add_default(struct perf_evlist *evlist)

tools/perf/util/evlist.h

@@ -21,6 +21,7 @@ struct perf_evlist {
 	struct list_head entries;
 	struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];
 	int		 nr_entries;
+	int		 nr_groups;
 	int		 nr_fds;
 	int		 nr_mmaps;
 	int		 mmap_len;

tools/perf/util/evsel.h

@@ -74,6 +74,7 @@ struct perf_evsel {
 	bool 			needs_swap;
 	/* parse modifier helper */
 	int			exclude_GH;
+	int			nr_members;
 	struct perf_evsel	*leader;
 	char			*group_name;
 };
@@ -259,4 +260,9 @@ bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
 int perf_evsel__open_strerror(struct perf_evsel *evsel,
 			      struct perf_target *target,
 			      int err, char *msg, size_t size);
+
+static inline int perf_evsel__group_idx(struct perf_evsel *evsel)
+{
+	return evsel->idx - evsel->leader->idx;
+}
 #endif /* __PERF_EVSEL_H */

tools/perf/util/parse-events.c

@@ -884,6 +884,7 @@ int parse_events(struct perf_evlist *evlist, const char *str)
 	if (!ret) {
 		int entries = data.idx - evlist->nr_entries;
 		perf_evlist__splice_list_tail(evlist, &data.list, entries);
+		evlist->nr_groups += data.nr_groups;
 		return 0;
 	}
 

tools/perf/util/parse-events.h

@@ -64,6 +64,7 @@ struct parse_events_term {
 struct parse_events_evlist {
 	struct list_head list;
 	int idx;
+	int nr_groups;
 };
 
 struct parse_events_terms {

tools/perf/util/parse-events.y

@@ -23,6 +23,14 @@ do { \
 		YYABORT; \
 } while (0)
 
+static inc_group_count(struct list_head *list,
+		       struct parse_events_evlist *data)
+{
+	/* Count groups only have more than 1 members */
+	if (!list_is_last(list->next, list))
+		data->nr_groups++;
+}
+
 %}
 
 %token PE_START_EVENTS PE_START_TERMS
@@ -123,6 +131,7 @@ PE_NAME '{' events '}'
 {
 	struct list_head *list = $3;
 
+	inc_group_count(list, _data);
 	parse_events__set_leader($1, list);
 	$$ = list;
 }
@@ -131,6 +140,7 @@ PE_NAME '{' events '}'
 {
 	struct list_head *list = $2;
 
+	inc_group_count(list, _data);
 	parse_events__set_leader(NULL, list);
 	$$ = list;
 }