--- old/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	2020-02-17 17:22:56.339248719 +0800
+++ new/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	2020-02-17 17:22:56.342248827 +0800
@@ -781,7 +781,11 @@
                                     G1RedirtyCardsQueueSet* rdcqs,
                                     G1ParScanThreadStateSet* pss);
 
-  void expand_heap_after_young_collection();
+  void resize_heap_after_young_collection();
+  bool expand_heap_after_young_collection();
+  void shrink_heap_after_young_collection();
+  void expand_heap_after_concurrent_mark();
+
   // Update object copying statistics.
   void record_obj_copy_mem_stats();
 
@@ -1078,7 +1082,7 @@
 
   inline void archive_set_add(HeapRegion* hr);
 
-  size_t non_young_capacity_bytes() {
+  size_t non_young_capacity_bytes() const {
     return (old_regions_count() + _archive_set.length() + humongous_regions_count()) * HeapRegion::GrainBytes;
   }
 
@@ -1280,6 +1284,9 @@
   // Return the size of reserved memory. Returns different value than max_capacity() when AllocateOldGenAt is used.
   virtual size_t max_reserved_capacity() const;
 
+  // Print the soft maximum heap capacity.
+  size_t soft_max_capacity() const;
+
   virtual jlong millis_since_last_gc();