Set unswept free bytes for concurent sweeper.

src/spaces.h

Index: src/spaces.h
diff --git a/src/spaces.h b/src/spaces.h
index 3f8e395676649820cdd322ee16ae1196e2b9978e..482581de4c6ee7ce551f17ea016e340fd8f9982f 100644
--- a/src/spaces.h
+++ b/src/spaces.h
@@ -1749,11 +1749,19 @@ class PagedSpace : public Space {
     unswept_free_bytes_ += (p->area_size() - p->LiveBytes());
   }
 
+  void DecrementUnsweptFreeBytes(int by) {
+    unswept_free_bytes_ -= by;
+  }
+
   void DecreaseUnsweptFreeBytes(Page* p) {
     ASSERT(ShouldBeSweptLazily(p));
     unswept_free_bytes_ -= (p->area_size() - p->LiveBytes());
   }
 
+  void ResetUnsweptFreeBytes() {
+    unswept_free_bytes_ = 0;
+  }
+
   bool AdvanceSweeper(intptr_t bytes_to_sweep);
 
   // When parallel sweeper threads are active this function waits
@@ -1784,13 +1792,13 @@ class PagedSpace : public Space {
     return area_size_;
   }
 
- protected:
-  FreeList* free_list() { return &free_list_; }
-
   void AddToAccountingStats(intptr_t bytes) {

[Michael Starzinger, 2013/02/28 14:49:53]

Since this is no longer protected, let's move it up where the other stats
functions are (e.g. to below ClearStats) and add a short comment about it's
semantics.

[Hannes Payer (out of office), 2013/02/28 15:07:15]

Done.

     accounting_stats_.DeallocateBytes(bytes);
   }
 
+ protected:
+  FreeList* free_list() { return &free_list_; }
+
   int area_size_;
 
   // Maximum capacity of this space.