Change age-mark to not expect pages to be in increasing order.

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index d35dabcb2084c6b56ca41f81f3f6ebe680794931..7cf0f4ad3f950078594dfc536227a8173ffcf10b 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -302,7 +302,11 @@ bool Heap::ShouldBePromoted(Address old_address, int object_size) {
   // - the object has survived a scavenge operation or
   // - to space is already 25% full.
   // TODO(gc): Do something about age-mark in paged new-space.

[Vyacheslav Egorov (Chromium), 2011/06/14 12:12:46]

You can remove this todo.

-  return old_address < new_space_.age_mark()
+  NewSpacePage* page = NewSpacePage::FromAddress(old_address);
+  Address age_mark = new_space_.age_mark();
+  bool below_mark = page->IsFlagSet(MemoryChunk::NEW_SPACE_BELOW_AGE_MARK)
+      && (!page->ContainsLimit(age_mark) || old_address < age_mark);
+  return below_mark
       || (new_space_.Size() + object_size) >= (new_space_.Capacity() >> 2);

[Vyacheslav Egorov (Chromium), 2011/06/14 12:12:46]

move || to the end of the previous line

 }