Avoid incremental marking write-barrier when constructing descriptor arrays.

src/incremental-marking.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 32 matching lines @@
       marking_deque_memory_(NULL),
       steps_count_(0),
       steps_took_(0),
       longest_step_(0.0),
       old_generation_space_available_at_start_of_incremental_(0),
       old_generation_space_used_at_start_of_incremental_(0),
       steps_count_since_last_gc_(0),
       steps_took_since_last_gc_(0),
       should_hurry_(false),
       allocation_marking_factor_(0),
-      allocated_(0) {
+      allocated_(0),
+      no_marking_scope_depth_(0) {
 }
 
 
 void IncrementalMarking::TearDown() {
   delete marking_deque_memory_;
 }
 
 
 void IncrementalMarking::RecordWriteFromCode(HeapObject* obj,
                                              Object* value,
@@ skipping 631 matching lines @@
       !FLAG_incremental_marking ||
       !FLAG_incremental_marking_steps ||
       (state_ != SWEEPING && state_ != MARKING)) {
     return;
   }
 
   allocated_ += allocated_bytes;
 
   if (allocated_ < kAllocatedThreshold) return;
 
+  if (state_ == MARKING && no_marking_scope_depth_ > 0) return;
+
   intptr_t bytes_to_process = allocated_ * allocation_marking_factor_;
 
   double start = 0;
 
   if (FLAG_trace_incremental_marking || FLAG_trace_gc) {
     start = OS::TimeCurrentMillis();
   }
 
   if (state_ == SWEEPING) {
     if (heap_->old_pointer_space()->AdvanceSweeper(bytes_to_process) &&
@@ skipping 104 matching lines @@
   bytes_rescanned_ = 0;
   allocation_marking_factor_ = kInitialAllocationMarkingFactor;
 }
 
 
 int64_t IncrementalMarking::SpaceLeftInOldSpace() {
   return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSize();
 }
 
 } }  // namespace v8::internal