--- /dev/null	2018-11-30 10:10:44.238550338 +0100
+++ new/src/hotspot/share/gc/shenandoah/heuristics/shenandoahAdaptiveHeuristics.hpp	2018-11-30 21:08:59.567902045 +0100
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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_SHENANDOAH_HEURISTICS_SHENANDOAHADAPTIVEHEURISTICS_HPP
+#define SHARE_VM_GC_SHENANDOAH_HEURISTICS_SHENANDOAHADAPTIVEHEURISTICS_HPP
+
+#include "gc/shenandoah/shenandoahHeuristics.hpp"
+#include "gc/shenandoah/shenandoahPhaseTimings.hpp"
+#include "utilities/numberSeq.hpp"
+
+class ShenandoahAdaptiveHeuristics : public ShenandoahHeuristics {
+private:
+  TruncatedSeq* _cycle_gap_history;
+  TruncatedSeq* _conc_mark_duration_history;
+  TruncatedSeq* _conc_uprefs_duration_history;
+
+public:
+  ShenandoahAdaptiveHeuristics();
+
+  virtual ~ShenandoahAdaptiveHeuristics();
+
+  virtual void choose_collection_set_from_regiondata(ShenandoahCollectionSet* cset,
+                                                     RegionData* data, size_t size,
+                                                     size_t actual_free);
+
+  void record_cycle_start();
+
+  virtual void record_phase_time(ShenandoahPhaseTimings::Phase phase, double secs);
+
+  virtual bool should_start_normal_gc() const;
+
+  virtual bool should_start_update_refs();
+
+  virtual const char* name();
+
+  virtual bool is_diagnostic();
+
+  virtual bool is_experimental();
+};
+
+#endif // SHARE_VM_GC_SHENANDOAH_HEURISTICS_SHENANDOAHADAPTIVEHEURISTICS_HPP