--- /dev/null	2016-02-17 13:41:52.116008013 +0100
+++ new/src/share/vm/gc/g1/g1HeapSizingPolicy.hpp	2016-03-15 12:03:20.951179203 +0100
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2016, 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_G1HEAPSIZINGPOLICY_HPP
+#define SHARE_VM_GC_G1_G1HEAPSIZINGPOLICY_HPP
+
+#include <memory/allocation.hpp>
+
+class G1CollectedHeap;
+class G1Measurements;
+
+class G1HeapSizingPolicy: public CHeapObj<mtGC> {
+  const static uint NumPrevPausesForHeuristics = 10;
+    // MinOverThresholdForGrowth must be less than NumPrevPausesForHeuristics,
+    // representing the minimum number of pause time ratios that exceed
+    // GCTimeRatio before a heap expansion will be triggered.
+  const static uint MinOverThresholdForGrowth = 4;
+
+  const G1CollectedHeap* _g1;
+  const G1Measurements* _measurements;
+  // Ratio check data for determining if heap growth is necessary.
+  uint _ratio_over_threshold_count;
+  double _ratio_over_threshold_sum;
+  uint _pauses_since_start;
+
+protected:
+  G1HeapSizingPolicy(const G1CollectedHeap* g1, const G1Measurements* measurements) :
+      _g1(g1), _measurements(measurements) {
+    clear_ratio_check_data();
+  }
+public:
+
+  // If an expansion would be appropriate, because recent GC overhead had
+  // exceeded the desired limit, return an amount to expand by.
+  virtual size_t expansion_amount();
+
+  // Clear ratio tracking data used by expansion_amount().
+  void clear_ratio_check_data();
+
+  static G1HeapSizingPolicy* create(const G1CollectedHeap* g1, const G1Measurements* measurements);
+};
+
+#endif // SRC_SHARE_VM_GC_G1_G1HEAPSIZINGPOLICY_HPP