--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1RegionsOnNodes.hpp	Wed Nov 13 10:51:41 2019 -0800
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_G1_G1REGIONS_HPP
+#define SHARE_VM_GC_G1_G1REGIONS_HPP
+
+#include "memory/allocation.hpp"
+
+class G1NUMA;
+class HeapRegion;
+
+// Contains per node index region count
+class G1RegionsOnNodes : public StackObj {
+  volatile uint* _count_per_node;
+  G1NUMA*        _numa;
+
+public:
+  G1RegionsOnNodes();
+
+  ~G1RegionsOnNodes();
+
+  // Increase _count_per_node for the node of given heap region and returns node index.
+  uint add(HeapRegion* hr);
+
+  void clear();
+
+  uint count(uint node_index) const;
+};
+
+#endif // SHARE_VM_GC_G1_G1REGIONS_HPP