--- a/src/share/vm/memory/generation.hpp	Fri Jul 25 11:29:03 2008 -0700
+++ b/src/share/vm/memory/generation.hpp	Mon Jul 28 15:30:23 2008 -0700
@@ -376,6 +376,9 @@
   // The default is to do nothing.
   virtual void gc_epilogue(bool full) {};
 
+  // Save the high water marks for the used space in a generation.
+  virtual void record_spaces_top() {};
+
   // Some generations may need to be "fixed-up" after some allocation
   // activity to make them parsable again. The default is to do nothing.
   virtual void ensure_parsability() {};
@@ -476,6 +479,10 @@
   virtual void contribute_scratch(ScratchBlock*& list, Generation* requestor,
                                   size_t max_alloc_words) {}
 
+  // Give each generation an opportunity to do clean up for any
+  // contributed scratch.
+  virtual void reset_scratch() {};
+
   // When an older generation has been collected, and perhaps resized,
   // this method will be invoked on all younger generations (from older to
   // younger), allowing them to resize themselves as appropriate.
@@ -699,6 +706,8 @@
 
   virtual void gc_epilogue(bool full);
 
+  virtual void record_spaces_top();
+
   virtual void verify(bool allow_dirty);
   virtual void print_on(outputStream* st) const;
 };