Flush watermarks after compacting map space on mark-sweep collection.

src/spaces.h

 // Copyright 2006-2010 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 2103 matching lines @@
     Page* top_page = Page::FromAddress(new_top);
     ASSERT(top_page->is_valid());
 
     SetAllocationInfo(&allocation_info_, top_page);
     allocation_info_.top = new_top;
 
     int new_size = live_maps * Map::kSize;
     accounting_stats_.DeallocateBytes(accounting_stats_.Size());
     accounting_stats_.AllocateBytes(new_size);
 
+    // Flush allocation watermarks.
+    for (Page* p = first_page_; p != top_page; p = p->next_page()) {
+      p->SetAllocationWatermark(p->AllocationTop());
+    }
+    top_page->SetAllocationWatermark(new_top);
+
 #ifdef DEBUG
     if (FLAG_enable_slow_asserts) {
       intptr_t actual_size = 0;
       for (Page* p = first_page_; p != top_page; p = p->next_page())
         actual_size += kMapsPerPage * Map::kSize;
       actual_size += (new_top - top_page->ObjectAreaStart());
       ASSERT(accounting_stats_.Size() == actual_size);
     }
 #endif
 
@@ skipping 213 matching lines @@
 
  private:
   LargeObjectChunk* current_;
   HeapObjectCallback size_func_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_