--- /dev/null	2020-05-05 16:06:32.280000000 +0000
+++ new/src/hotspot/share/gc/g1/g1OldGenAllocationTracker.cpp	2020-06-01 22:21:16.202890910 +0000
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020, Amazon.com, Inc. 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/g1OldGenAllocationTracker.hpp"
+
+G1OldGenAllocationTracker::G1OldGenAllocationTracker() :
+  _last_cycle_old_bytes(0),
+  _last_cycle_duration(0.0),
+  _allocated_bytes_since_last_gc(0) {
+}
+
+void G1OldGenAllocationTracker::reset_after_gc(double allocation_duration_s,
+                                               bool is_full_gc) {
+  _last_cycle_old_bytes = _allocated_bytes_since_last_gc;
+  // We do not care about the allocation duration before a full GC.
+  _last_cycle_duration = is_full_gc ? 0 : allocation_duration_s;
+  // Reset
+  _allocated_bytes_since_last_gc = 0;
+}