Use worst-fit allocation in old space for prentured objects.

src/mark-compact.cc

 // Copyright 2012 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 2658 matching lines @@
                     LO_SPACE);
       heap()->mark_compact_collector()->tracer()->
           increment_promoted_objects_size(object_size);
       return true;
     }
   } else {
     OldSpace* target_space = heap()->TargetSpace(object);
 
     ASSERT(target_space == heap()->old_pointer_space() ||
            target_space == heap()->old_data_space());
-    MaybeObject* maybe_result = target_space->AllocateRaw(object_size);
+    MaybeObject* maybe_result =
+        target_space->AllocateRaw<FreeList::BEST_FIT>(object_size);
     if (maybe_result->ToObject(&result)) {
       HeapObject* target = HeapObject::cast(result);
       MigrateObject(target->address(),
                     object->address(),
                     object_size,
                     target_space->identity());
       heap()->mark_compact_collector()->tracer()->
           increment_promoted_objects_size(object_size);
       return true;
     }
@@ skipping 102 matching lines @@
     if (cells[cell_index] == 0) continue;
 
     int live_objects = MarkWordToObjectStarts(cells[cell_index], offsets);
     for (int i = 0; i < live_objects; i++) {
       Address object_addr = cell_base + offsets[i] * kPointerSize;
       HeapObject* object = HeapObject::FromAddress(object_addr);
       ASSERT(Marking::IsBlack(Marking::MarkBitFrom(object)));
 
       int size = object->Size();
 
-      MaybeObject* target = space->AllocateRaw(size);
+      MaybeObject* target = space->AllocateRaw<FreeList::BEST_FIT>(size);
       if (target->IsFailure()) {
         // OS refused to give us memory.
         V8::FatalProcessOutOfMemory("Evacuation");
         return;
       }
 
       Object* target_object = target->ToObjectUnchecked();
 
       MigrateObject(HeapObject::cast(target_object)->address(),
                     object_addr,
@@ skipping 1318 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal