--- old/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp	2010-04-27 08:04:21.000000000 -0700
+++ new/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp	2010-04-27 08:04:21.000000000 -0700
@@ -49,6 +49,11 @@
   const size_t _min_gen_size;
   const size_t _max_gen_size;
 
+  size_t _init_survivor_size;
+  size_t _init_eden_size;
+  size_t _max_survivor_size;
+  size_t _max_eden_size;
+
   // Performance counters
   PSGenerationCounters*     _gen_counters;
   SpaceCounters*            _eden_counters;
@@ -91,6 +96,8 @@
   virtual void initialize(ReservedSpace rs, size_t alignment);
   virtual void initialize_virtual_space(ReservedSpace rs, size_t alignment);
 
+  size_t init_gen_size()                    { return _init_gen_size; }
+
   MemRegion reserved() const            { return _reserved; }
 
   bool is_in(const void* p) const   {
@@ -187,4 +194,7 @@
                         MemRegion s2MR) PRODUCT_RETURN;
 
   void record_spaces_top() PRODUCT_RETURN;
+
+  void try_to_expand_by(size_t expand_bytes);
+  void try_to_shrink_by(size_t shrink_bytes);
 };