Allocation site pretenuring.

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 3dce348727477c260c894f3710956e4fe0e2ce8f..43fac441ae55b64e537fc9d5a752d7e3b307699a 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -484,7 +484,9 @@ void Heap::ScavengePointer(HeapObject** p) {
 
 
 void Heap::UpdateAllocationSiteFeedback(HeapObject* object) {
+  Heap* heap = object->GetIsolate()->heap();
   if (FLAG_allocation_site_pretenuring &&
+      heap->new_space_high_promotion_mode_active_ &&
       AllocationSite::CanTrack(object->map()->instance_type())) {
     AllocationMemento* memento = AllocationMemento::FindForHeapObject(

[mvstanton, 2014/01/09 15:33:30]

nit: you could pass the heap into FindForHeapObject now that you are looking it
up once.

[Hannes Payer (out of office), 2014/01/09 16:01:09]

Done.

         object, true);
@@ -492,7 +494,6 @@ void Heap::UpdateAllocationSiteFeedback(HeapObject* object) {
       ASSERT(memento->IsValid());
       bool add_to_scratchpad =
           memento->GetAllocationSite()->IncrementMementoFoundCount();
-      Heap* heap = object->GetIsolate()->heap();
       if (add_to_scratchpad && heap->allocation_sites_scratchpad_length <
               kAllocationSiteScratchpadSize) {
         heap->allocation_sites_scratchpad[