--- a/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Wed Sep 07 18:58:33 2011 -0700
+++ b/hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Thu Sep 08 05:16:49 2011 -0400
@@ -1682,6 +1682,7 @@
       }
       assert(curr == mr.end(), "post-condition");
     }
+    g1_policy()->calculate_reserve(n_regions());
   } else {
     ergo_verbose0(ErgoHeapSizing,
                   "did not expand the heap",
@@ -1732,6 +1733,7 @@
     _expansion_regions += num_regions_deleted;
     update_committed_space(old_end, new_end);
     HeapRegionRemSet::shrink_heap(n_regions());
+    g1_policy()->calculate_reserve(n_regions());
   } else {
     ergo_verbose0(ErgoHeapSizing,
                   "did not shrink the heap",