--- /dev/null	2019-10-07 09:27:17.753004199 -0700
+++ new/src/hotspot/share/gc/g1/g1RegionCounts.cpp	2019-11-01 16:13:29.420400641 -0700
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/g1/g1NUMA.hpp"
+#include "gc/g1/g1RegionCounts.hpp"
+
+G1RegionCounts::G1RegionCounts() : _length_per_node(NULL), _numa(G1NUMA::numa()) {
+  _length_per_node = NEW_C_HEAP_ARRAY(uint, _numa->num_active_nodes(), mtGC);
+  clear();
+}
+
+G1RegionCounts::~G1RegionCounts() {
+  FREE_C_HEAP_ARRAY(uint, _length_per_node);
+}
+
+uint G1RegionCounts::add(HeapRegion* hr) {
+  uint node_index = hr->node_index();
+
+  // Update only if the node index is valid.
+  if (node_index < _numa->num_active_nodes()) {
+    *(_length_per_node + node_index) += 1;
+    return node_index;
+  }
+
+  return G1NUMA::UnknownNodeIndex;
+}
+
+void G1RegionCounts::clear() {
+  for (uint i = 0; i < _numa->num_active_nodes(); i++) {
+    _length_per_node[i] = 0;
+  }
+}
+
+uint G1RegionCounts::length(uint node_index) const {
+  return _length_per_node[node_index];
+}