--- old/src/share/vm/runtime/globals.hpp	2013-01-18 11:37:36.933308000 -0800
+++ new/src/share/vm/runtime/globals.hpp	2013-01-18 11:37:36.848310000 -0800
@@ -3631,7 +3631,10 @@
           "Enable internal testing APIs")                                   \
                                                                             \
   product(bool, PrintGCCause, true,                                         \
-          "Include GC cause in GC logging")
+          "Include GC cause in GC logging")                                 \
+                                                                            \
+  product(bool, DeallocateHeapPages, false,                                 \
+          "Deallocate (unused portion of) in-RAM heap pages to save RAM")
 
 /*
  *  Macros for factoring of globals