--- a/hotspot/src/share/vm/gc/shared/gcHeapSummary.hpp	Thu Feb 11 12:11:02 2016 +0000
+++ b/hotspot/src/share/vm/gc/shared/gcHeapSummary.hpp	Thu Feb 11 16:49:12 2016 +0100
@@ -131,12 +131,14 @@
   size_t  _edenUsed;
   size_t  _edenCapacity;
   size_t  _survivorUsed;
+  uint    _numberOfRegions;
  public:
-   G1HeapSummary(VirtualSpaceSummary& heap_space, size_t heap_used, size_t edenUsed, size_t edenCapacity, size_t survivorUsed) :
-       GCHeapSummary(heap_space, heap_used), _edenUsed(edenUsed), _edenCapacity(edenCapacity), _survivorUsed(survivorUsed) { }
+   G1HeapSummary(VirtualSpaceSummary& heap_space, size_t heap_used, size_t edenUsed, size_t edenCapacity, size_t survivorUsed, uint numberOfRegions) :
+      GCHeapSummary(heap_space, heap_used), _edenUsed(edenUsed), _edenCapacity(edenCapacity), _survivorUsed(survivorUsed), _numberOfRegions(numberOfRegions) { }
    const size_t edenUsed() const { return _edenUsed; }
    const size_t edenCapacity() const { return _edenCapacity; }
    const size_t survivorUsed() const { return _survivorUsed; }
+   const uint   numberOfRegions() const { return _numberOfRegions; }
 
    virtual void accept(GCHeapSummaryVisitor* visitor) const {
      visitor->visit(this);