--- a/hotspot/src/share/vm/gc_implementation/parNew/parGCAllocBuffer.cpp	Wed Aug 27 22:45:38 2008 -0700
+++ b/hotspot/src/share/vm/gc_implementation/parNew/parGCAllocBuffer.cpp	Thu Aug 28 18:17:56 2008 -0700
@@ -229,7 +229,7 @@
     HeapWord* first_card_start = _bsa->address_for_index(first_card_index);
     if (first_card_start < pre_top) {
       HeapWord* second_card_start =
-        _bsa->address_for_index(first_card_index + 1);
+        _bsa->inc_by_region_size(first_card_start);
 
       // Ensure enough room to fill with the smallest block
       second_card_start = MAX2(second_card_start, pre_top + AlignmentReserve);

--- a/hotspot/src/share/vm/memory/blockOffsetTable.hpp	Wed Aug 27 22:45:38 2008 -0700
+++ b/hotspot/src/share/vm/memory/blockOffsetTable.hpp	Thu Aug 28 18:17:56 2008 -0700
@@ -199,6 +199,12 @@
   // "index" in "_offset_array".
   HeapWord* address_for_index(size_t index) const;
 
+  // Return the address "p" incremented by the size of
+  // a region.  This method does not align the address
+  // returned to the start of a region.  It is a simple
+  // primitive.
+  HeapWord* inc_by_region_size(HeapWord* p) const { return p + N_words; }
+
   // Shared space support
   void serialize(SerializeOopClosure* soc, HeapWord* start, HeapWord* end);
 };

--- a/hotspot/src/share/vm/memory/compactingPermGenGen.cpp	Wed Aug 27 22:45:38 2008 -0700
+++ b/hotspot/src/share/vm/memory/compactingPermGenGen.cpp	Thu Aug 28 18:17:56 2008 -0700
@@ -421,30 +421,6 @@
 }
 
 
-
-bool CompactingPermGenGen::grow_by(size_t bytes) {
-  // Don't allow _virtual_size to expand into shared spaces.
-  size_t max_bytes = _virtual_space.uncommitted_size() - _shared_space_size;
-  if (bytes > _shared_space_size) {
-    bytes = _shared_space_size;
-  }
-  return OneContigSpaceCardGeneration::grow_by(bytes);
-}
-
-
-bool CompactingPermGenGen::grow_to_reserved() {
-  // Don't allow _virtual_size to expand into shared spaces.
-  bool success = false;
-  if (_virtual_space.uncommitted_size() > _shared_space_size) {
-    size_t remaining_bytes =
-      _virtual_space.uncommitted_size() - _shared_space_size;
-    success = OneContigSpaceCardGeneration::grow_by(remaining_bytes);
-    DEBUG_ONLY(if (!success) warning("grow to reserved failed");)
-  }
-  return success;
-}
-
-
 // No young generation references, clear this generation's main space's
 // card table entries.  Do NOT clear the card table entries for the
 // read-only space (always clear) or the read-write space (valuable

--- a/hotspot/src/share/vm/memory/compactingPermGenGen.hpp	Wed Aug 27 22:45:38 2008 -0700
+++ b/hotspot/src/share/vm/memory/compactingPermGenGen.hpp	Thu Aug 28 18:17:56 2008 -0700
@@ -183,8 +183,6 @@
   void compact();
   void post_compact();
   size_t contiguous_available() const;
-  bool grow_by(size_t bytes);
-  virtual bool grow_to_reserved();
 
   void clear_remembered_set();
   void invalidate_remembered_set();

--- a/hotspot/src/share/vm/runtime/globals.hpp	Wed Aug 27 22:45:38 2008 -0700
+++ b/hotspot/src/share/vm/runtime/globals.hpp	Thu Aug 28 18:17:56 2008 -0700
@@ -1443,7 +1443,7 @@
           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
           " ratio")                                                         \
                                                                             \
-  product(bool, CMSPrecleanRefLists1, true,                                 \
+  product(bool, CMSPrecleanRefLists1, false,                                \
           "Preclean ref lists during (initial) preclean phase")             \
                                                                             \
   product(bool, CMSPrecleanRefLists2, false,                                \