Make heap size estimation more accurate.

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index ebd3e6519208d9103a1b9d5e5bd975442d14c7fb..1bcea22b8e1850116c44ac91f384cad426888898 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -749,6 +749,20 @@ int PagedSpace::CountTotalPages() {
 }
 
 
+intptr_t PagedSpace::SizeOfObjectsSlow() {

[Vyacheslav Egorov (Chromium), 2012/01/10 17:42:43]

we will call this function at least once at the end of GC (see garbage
collection epilogue).

I wonder if you can compute sum of "delayed" live bytes while in
MarkCompactCollector::SweepSpace and then adjust it while lazy sweeping
progresses.

[Michael Starzinger, 2012/01/11 09:55:57]

Done. Yes, we can.

+  PageIterator it(this);
+  intptr_t size_of_objects = accounting_stats_.Size();
+  while (it.has_next()) {
+    Page* p = it.next();
+    if (!p->WasSwept()) {
+      size_of_objects -= Page::kObjectAreaSize;
+      size_of_objects += p->LiveBytes();
+    }
+  }
+  return size_of_objects - (limit() - top());
+}
+
+
 void PagedSpace::ReleasePage(Page* page) {
   ASSERT(page->LiveBytes() == 0);