--- old/src/share/vm/gc/g1/heapRegionManager.hpp	2015-08-13 12:06:37.616313913 -0400
+++ new/src/share/vm/gc/g1/heapRegionManager.hpp	2015-08-13 12:06:37.016279631 -0400
@@ -241,8 +241,9 @@
   // Return the actual number of uncommitted regions.
   uint shrink_by(uint num_regions_to_remove);
 
-  // Uncommit the region at the specified index, which must be available and free.
-  void shrink_at(uint index);
+  // Uncommit a number of regions starting at the specified index, which must be available,
+  // empty, and free.
+  void shrink_at(uint index, size_t num_regions);
 
   void verify();