--- old/src/share/vm/gc/g1/g1MarkSweep.hpp	2015-06-11 15:13:23.262127418 -0400
+++ new/src/share/vm/gc/g1/g1MarkSweep.hpp	2015-06-11 15:13:21.898049402 -0400
@@ -55,11 +55,17 @@
   static STWGCTimer* gc_timer() { return GenMarkSweep::_gc_timer; }
   static SerialOldTracer* gc_tracer() { return GenMarkSweep::_gc_tracer; }
 
-  // Support for 'archive' objects, to prevent objects in archive regions
-  // from being marked by full GCs.
+  // Create the _archive_region_map which is used to identify archive objects.
   static void enable_archive_object_check();
-  static void mark_range_archive(HeapWord* start, HeapWord* end);
+
+  // Mark the regions containing the specified address range as archive regions.
+  static void mark_range_archive(MemRegion range);
+
+  // Check if an object is in an archive region using the _archive_region_map.
   static bool in_archive_range(oop object);
+
+  // Check if archive object checking is enabled, to avoid calling in_archive_range
+  // unnecessarily.
   static bool archive_check_enabled() { return G1MarkSweep::_archive_check_enabled; }
 
  private:
@@ -103,6 +109,9 @@
   bool doHeapRegion(HeapRegion* hr);
 };
 
+// G1ArchiveRegionMap is a boolean array used to mark G1 regions as 
+// archive regions.  This allows a quick check for whether an object
+// should not be marked because it is in an archive region.
 class G1ArchiveRegionMap : public G1BiasedMappedArray<bool> {
 protected:
   bool default_value() const { return false; }