v4.19.13 snapshot.
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
new file mode 100644
index 0000000..f033a80
--- /dev/null
+++ b/tools/perf/util/cgroup.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __CGROUP_H__
+#define __CGROUP_H__
+
+#include <linux/refcount.h>
+
+struct option;
+
+struct cgroup {
+ char *name;
+ int fd;
+ refcount_t refcnt;
+};
+
+
+extern int nr_cgroups; /* number of explicit cgroups defined */
+
+struct cgroup *cgroup__get(struct cgroup *cgroup);
+void cgroup__put(struct cgroup *cgroup);
+
+struct perf_evlist;
+
+struct cgroup *evlist__findnew_cgroup(struct perf_evlist *evlist, const char *name);
+
+void evlist__set_default_cgroup(struct perf_evlist *evlist, struct cgroup *cgroup);
+
+int parse_cgroups(const struct option *opt, const char *str, int unset);
+
+#endif /* __CGROUP_H__ */