Use worst-fit allocation in old space for prentured objects.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 82d586c9795a46f8e681e12b8bb49fed3f7975e5..89935adcc5887203373c794611eda92056ad422d 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -759,7 +759,8 @@ void Heap::ReserveSpace(
         if (space == NEW_SPACE) {
           allocation = new_space()->AllocateRaw(sizes[space]);
         } else {
-          allocation = paged_space(space)->AllocateRaw(sizes[space]);
+          allocation = paged_space(space)->
+              AllocateRaw<FreeList::BEST_FIT>(sizes[space]);
         }
         FreeListNode* node;
         if (!allocation->To<FreeListNode>(&node)) {
@@ -1917,10 +1918,12 @@ class ScavengingVisitor : public StaticVisitorBase {
                                                      NOT_EXECUTABLE);
       } else {
         if (object_contents == DATA_OBJECT) {
-          maybe_result = heap->old_data_space()->AllocateRaw(allocation_size);
+          maybe_result = heap->old_data_space()->
+              AllocateRaw<FreeList::BEST_FIT>(allocation_size);
         } else {
           maybe_result =
-              heap->old_pointer_space()->AllocateRaw(allocation_size);
+              heap->old_pointer_space()->
+                  AllocateRaw<FreeList::BEST_FIT>(allocation_size);
         }
       }
 
@@ -3689,7 +3692,7 @@ MaybeObject* Heap::AllocateByteArray(int length, PretenureFlag pretenure) {
   int size = ByteArray::SizeFor(length);
   Object* result;
   { MaybeObject* maybe_result = (size <= Page::kMaxNonCodeHeapObjectSize)
-                   ? old_data_space_->AllocateRaw(size)
+                   ? old_data_space_->AllocateRaw<FreeList::BEST_FIT>(size)
                    : lo_space_->AllocateRaw(size, NOT_EXECUTABLE);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
@@ -3779,7 +3782,7 @@ MaybeObject* Heap::CreateCode(const CodeDesc& desc,
   if (force_lo_space) {
     maybe_result = lo_space_->AllocateRaw(obj_size, EXECUTABLE);
   } else {
-    maybe_result = code_space_->AllocateRaw(obj_size);
+    maybe_result = code_space_->AllocateRaw<FreeList::BEST_FIT>(obj_size);
   }
   if (!maybe_result->To<HeapObject>(&result)) return maybe_result;
 
@@ -3842,7 +3845,7 @@ MaybeObject* Heap::CopyCode(Code* code) {
   if (obj_size > code_space()->AreaSize()) {
     maybe_result = lo_space_->AllocateRaw(obj_size, EXECUTABLE);
   } else {
-    maybe_result = code_space_->AllocateRaw(obj_size);
+    maybe_result = code_space_->AllocateRaw<FreeList::BEST_FIT>(obj_size);
   }
 
   Object* result;
@@ -3885,7 +3888,7 @@ MaybeObject* Heap::CopyCode(Code* code, Vector<byte> reloc_info) {
   if (new_obj_size > code_space()->AreaSize()) {
     maybe_result = lo_space_->AllocateRaw(new_obj_size, EXECUTABLE);
   } else {
-    maybe_result = code_space_->AllocateRaw(new_obj_size);
+    maybe_result = code_space_->AllocateRaw<FreeList::BEST_FIT>(new_obj_size);
   }
 
   Object* result;
@@ -5060,7 +5063,7 @@ MaybeObject* Heap::AllocateInternalizedStringImpl(
   Object* result;
   { MaybeObject* maybe_result = (size > Page::kMaxNonCodeHeapObjectSize)
                    ? lo_space_->AllocateRaw(size, NOT_EXECUTABLE)
-                   : old_data_space_->AllocateRaw(size);
+                   : old_data_space_->AllocateRaw<FreeList::BEST_FIT>(size);
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
 
@@ -6523,6 +6526,11 @@ intptr_t Heap::PromotedSpaceSizeOfObjects() {
 }
 
 
+intptr_t Heap::PretenuredSizeOfObjects() {
+  return old_pointer_space_->Pretenure() + old_data_space_->Pretenure();
+}
+
+
 intptr_t Heap::PromotedExternalMemorySize() {
   if (amount_of_external_allocated_memory_
       <= amount_of_external_allocated_memory_at_last_global_gc_) return 0;