src/hotspot/share/gc/g1/heapRegionSet.inline.hpp

*** 48,57 ****
--- 48,77 ----
    hr->set_containing_set(NULL);
    assert_heap_region_set(_length > 0, "pre-condition");
    _length--;
  }
  
+ inline void FreeRegionList::add_to_tail(HeapRegion* region_to_add) {
+   assert_free_region_list((length() == 0 && _head == NULL && _tail == NULL && _last == NULL) ||
+                           (length() >  0 && _head != NULL && _tail != NULL && _tail->hrm_index() < region_to_add->hrm_index()),
+                           "invariant");
+   // add() will verify the region and check mt safety.
+   add(region_to_add);
+ 
+   if (_head != NULL) {
+     // Link into list, next is already NULL, no need to set.
+     region_to_add->set_prev(_tail);
+     _tail->set_next(region_to_add);
+     _tail = region_to_add;
+   } else {
+     // Empty list, this region is now the list.
+     _head = region_to_add;
+     _tail = region_to_add;
+   }
+   increase_length(region_to_add->node_index());
+ }
+ 
  inline void FreeRegionList::add_ordered(HeapRegion* hr) {
    assert_free_region_list((length() == 0 && _head == NULL && _tail == NULL && _last == NULL) ||
                            (length() >  0 && _head != NULL && _tail != NULL),
                            "invariant");
    // add() will verify the region and check mt safety.