2 files changed, 31 insertions, 0 deletions

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index b9eac0daa0b9..fa6dbf0ea0d6 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -68,6 +68,18 @@ struct perf_evlist *perf_evlist__new_default(void)
         return evlist;
 }
 
+struct perf_evlist *perf_evlist__new_dummy(void)
+{
+        struct perf_evlist *evlist = perf_evlist__new();
+
+        if (evlist && perf_evlist__add_dummy(evlist)) {
+                perf_evlist__delete(evlist);
+                evlist = NULL;
+        }
+
+        return evlist;
+}
+
 /**
  * perf_evlist__set_id_pos - set the positions of event ids.
  * @evlist: selected event list
@@ -248,6 +260,22 @@ error:
         return -ENOMEM;
 }
 
+int perf_evlist__add_dummy(struct perf_evlist *evlist)
+{
+        struct perf_event_attr attr = {
+                .type   = PERF_TYPE_SOFTWARE,
+                .config = PERF_COUNT_SW_DUMMY,
+                .size   = sizeof(attr), /* to capture ABI version */
+        };
+        struct perf_evsel *evsel = perf_evsel__new(&attr);
+
+        if (evsel == NULL)
+                return -ENOMEM;
+
+        perf_evlist__add(evlist, evsel);
+        return 0;
+}
+
 static int perf_evlist__add_attrs(struct perf_evlist *evlist,
                                   struct perf_event_attr *attrs, size_t nr_attrs)
 {
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 139a50038097..3b7e1e2f1a86 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -67,6 +67,7 @@ struct perf_evsel_str_handler {
 
 struct perf_evlist *perf_evlist__new(void);
 struct perf_evlist *perf_evlist__new_default(void);
+struct perf_evlist *perf_evlist__new_dummy(void);
 void perf_evlist__init(struct perf_evlist *evlist, struct cpu_map *cpus,
                        struct thread_map *threads);
 void perf_evlist__exit(struct perf_evlist *evlist);
@@ -81,6 +82,8 @@ int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
 #define perf_evlist__add_default_attrs(evlist, array) \
         __perf_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
 
+int perf_evlist__add_dummy(struct perf_evlist *evlist);
+
 int perf_evlist__add_newtp(struct perf_evlist *evlist,
                            const char *sys, const char *name, void *handler);