diff -r ea3d0c81cee9 -r b90650e2a9f7 hotspot/src/share/vm/memory/genCollectedHeap.hpp
--- a/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Fri Jul 25 11:29:03 2008 -0700
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.hpp	Mon Jul 28 15:30:23 2008 -0700
@@ -259,6 +259,9 @@
   // be provided are returned as a list of ScratchBlocks, sorted by
   // decreasing size.
   ScratchBlock* gather_scratch(Generation* requestor, size_t max_alloc_words);
+  // Allow each generation to reset any scratch space that it has
+  // contributed as it needs.
+  void release_scratch();
 
   size_t large_typearray_limit();
 
@@ -482,6 +485,9 @@
   bool should_do_concurrent_full_gc(GCCause::Cause cause);
   void collect_mostly_concurrent(GCCause::Cause cause);
 
+  // Save the tops of the spaces in all generations
+  void record_gen_tops_before_GC() PRODUCT_RETURN;
+
 protected:
   virtual void gc_prologue(bool full);
   virtual void gc_epilogue(bool full);