--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2013-02-06 15:32:10.000000000 +0100
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2013-02-06 15:32:10.000000000 +0100
@@ -37,6 +37,7 @@
 #include "memory/barrierSet.hpp"
 #include "memory/memRegion.hpp"
 #include "memory/sharedHeap.hpp"
+#include "utilities/stack.hpp"
 
 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot.
 // It uses the "Garbage First" heap organization and algorithm, which
@@ -879,8 +880,8 @@
 
   // When one is non-null, so is the other.  Together, they each pair is
   // an object with a preserved mark, and its mark value.
-  GrowableArray<oop>*     _objs_with_preserved_marks;
-  GrowableArray<markOop>* _preserved_marks_of_objs;
+  Stack<oop, mtGC>     _objs_with_preserved_marks;
+  Stack<markOop, mtGC> _preserved_marks_of_objs;
 
   // Preserve the mark of "obj", if necessary, in preparation for its mark
   // word being overwritten with a self-forwarding-pointer.