Do not delay sweeping of pages that are completely free.

src/spaces.cc

 // Copyright 2011 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 734 matching lines @@
     it.next();
     count++;
   }
   return count;
 }
 
 
 void PagedSpace::ReleasePage(Page* page) {
   ASSERT(page->LiveBytes() == 0);
 
-  // Adjust list of unswept pages if the page is it's head or tail.
+  // Adjust list of unswept pages if the page is it's head.

[Erik Corry, 2011/12/19 11:23:58]

it's ->its.

Actually "if the page is the head of the list".

   if (first_unswept_page_ == page) {
     first_unswept_page_ = page->next_page();
     if (first_unswept_page_ == anchor()) {
       first_unswept_page_ = Page::FromAddress(NULL);
     }
   }
 
   if (page->WasSwept()) {
     intptr_t size = free_list_.EvictFreeListItems(page);
     accounting_stats_.AllocateBytes(size);
@@ skipping 1887 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal