3 files changed, 8 insertions, 3 deletions
diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index a0aaf385cbb5..68b90bbf0ffb 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -66,6 +66,7 @@ static void perf_evlist__propagate_maps(struct perf_evlist *evlist)
 void perf_evlist__add(struct perf_evlist *evlist,
 		      struct perf_evsel *evsel)
 {
+	evsel->idx = evlist->nr_entries;
 	list_add_tail(&evsel->node, &evlist->entries);
 	evlist->nr_entries += 1;
 	__perf_evlist__propagate_maps(evlist, evsel);
diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c
index bd8c2f19ef74..dccdc3456b23 100644
--- a/tools/lib/perf/evsel.c
+++ b/tools/lib/perf/evsel.c
@@ -18,10 +18,12 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 
-void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr)
+void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
+		      int idx)
 {
 	INIT_LIST_HEAD(&evsel->node);
 	evsel->attr = *attr;
+	evsel->idx  = idx;
 }
 
 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
@@ -29,7 +31,7 @@ struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
 	struct perf_evsel *evsel = zalloc(sizeof(*evsel));
 
 	if (evsel != NULL)
-		perf_evsel__init(evsel, attr);
+		perf_evsel__init(evsel, attr, 0);
 
 	return evsel;
 }
diff --git a/tools/lib/perf/include/internal/evsel.h b/tools/lib/perf/include/internal/evsel.h
index 1c067d088bc6..86f674e36f62 100644
--- a/tools/lib/perf/include/internal/evsel.h
+++ b/tools/lib/perf/include/internal/evsel.h
@@ -49,9 +49,11 @@ struct perf_evsel {
 	/* parse modifier helper */
 	int			 nr_members;
 	bool			 system_wide;
+	int			 idx;
 };
 
-void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr);
+void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
+		      int idx);
 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
 void perf_evsel__close_fd(struct perf_evsel *evsel);
 void perf_evsel__free_fd(struct perf_evsel *evsel);