--- old/src/share/vm/gc/g1/g1IHOPControl.hpp	2015-11-11 10:07:39.596922307 +0100
+++ new/src/share/vm/gc/g1/g1IHOPControl.hpp	2015-11-11 10:07:39.516919931 +0100
@@ -81,4 +81,35 @@
 #endif
 };
 
+class G1AdaptiveIHOPControl : public G1IHOPControl {
+  G1Predictions const * _predictor;
+
+  TruncatedSeq _marking_times_s;
+  TruncatedSeq _allocation_rate_s;
+
+  size_t _last_allocation_bytes; // Most recent mutator allocation since last GC.
+  size_t _prev_unrestrained_young_size;
+
+  size_t _current_threshold;
+
+  // Updates _current_threshold according to internal state.
+  void recalculate();
+
+  bool have_enough_data_for_prediction() const;
+ public:
+  G1AdaptiveIHOPControl(double ihop_percent, size_t initial_target_occupancy, G1Predictions const* predictor);
+
+  virtual void set_target_occupancy(size_t target_occupancy);
+
+  virtual size_t get_conc_mark_start_threshold();
+
+  virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size);
+  virtual void update_time_to_mixed(double marking_length_s);
+
+  virtual void print();
+#ifndef PRODUCT
+  static void test();
+#endif
+};
+
 #endif // SHARE_VM_GC_G1_G1IHOPCONTROL_HPP