Change to limit the amount of space we waste due to fragmentation ...

src/mark-compact.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 112 matching lines @@
   // The current stage of the collector.
   static CollectorState state_;
 #endif
 
   // Global flag that forces a compaction.
   static bool force_compaction_;
 
   // Global flag indicating whether spaces were compacted on the last GC.
   static bool compacting_collection_;
 
+  // Global flag indicating whether spaces will be compacted on the next GC.
+  static bool compact_on_next_gc_;
+
   // The number of objects left marked at the end of the last completed full
   // GC (expected to be zero).
   static int previous_marked_count_;
 
   // A pointer to the current stack-allocated GC tracer object during a full
   // collection (NULL before and after).
   static GCTracer* tracer_;
 
   // Finishes GC, performs heap verification if enabled.
   static void Finish();
@@ skipping 279 matching lines @@
 
   friend class UnmarkObjectVisitor;
   static void UnmarkObject(HeapObject* obj);
 #endif
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_MARK_COMPACT_H_