--- old/src/hotspot/share/gc/g1/g1CollectorPolicy.cpp	2018-11-19 17:19:46.191766400 -0800
+++ new/src/hotspot/share/gc/g1/g1CollectorPolicy.cpp	2018-11-19 17:19:45.308032300 -0800
@@ -55,3 +55,19 @@
   size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size();
   _heap_alignment = MAX3(card_table_alignment, _space_alignment, page_size);
 }
+
+size_t G1CollectorPolicy::heap_reservation_size_bytes() {
+  return _max_heap_byte_size;
+}
+
+G1HeteroCollectorPolicy::G1HeteroCollectorPolicy() : _heap_reservation_size_bytes(MaxHeapSize*2) {
+}
+
+void G1HeteroCollectorPolicy::initialize_size_info() {
+  G1CollectorPolicy::initialize_size_info();
+  _heap_reservation_size_bytes = 2 * _max_heap_byte_size;
+}
+
+size_t G1HeteroCollectorPolicy::heap_reservation_size_bytes() {
+  return _heap_reservation_size_bytes;
+}
\ No newline at end of file