Tenure allocation sites only when semi-space is maximum size.

src/spaces.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_SPACES_H_
 #define V8_SPACES_H_
 
 #include "allocation.h"
 #include "hashmap.h"
 #include "list.h"
@@ skipping 2481 matching lines @@
   intptr_t Available() {
     return Capacity() - Size();
   }
 
   // Return the maximum capacity of a semispace.
   int MaximumCapacity() {
     ASSERT(to_space_.MaximumCapacity() == from_space_.MaximumCapacity());
     return to_space_.MaximumCapacity();
   }
 
+  bool IsAtMaximumCapacity() {
+    return Capacity() == MaximumCapacity();
+  }
+
   // Returns the initial capacity of a semispace.
   int InitialCapacity() {
     ASSERT(to_space_.InitialCapacity() == from_space_.InitialCapacity());
     return to_space_.InitialCapacity();
   }
 
   // Return the address of the allocation pointer in the active semispace.
   Address top() {
     ASSERT(to_space_.current_page()->ContainsLimit(allocation_info_.top()));
     return allocation_info_.top();
@@ skipping 484 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_