Force incremental marking steps in incremental-marking-job only if

src/heap/incremental-marking-job.cc

 // Copyright 2012 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.
 
 #include "src/heap/incremental-marking-job.h"
 
 #include "src/base/platform/time.h"
 #include "src/heap/heap-inl.h"
 #include "src/heap/heap.h"
 #include "src/heap/incremental-marking.h"
@@ skipping 35 matching lines @@
     if (V8::GetCurrentPlatform()->IdleTasksEnabled(isolate)) {
       idle_task_pending_ = true;
       auto task = new IdleTask(heap->isolate(), this);
       V8::GetCurrentPlatform()->CallIdleOnForegroundThread(isolate, task);
     }
   }
 }
 
 
 void IncrementalMarkingJob::ScheduleDelayedTask(Heap* heap) {
-  if (!delayed_task_pending_) {
+  if (!delayed_task_pending_ && FLAG_memory_reducer) {
     v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(heap->isolate());
     delayed_task_pending_ = true;
     made_progress_since_last_delayed_task_ = false;
     auto task = new DelayedTask(heap->isolate(), this);
     V8::GetCurrentPlatform()->CallDelayedOnForegroundThread(isolate, task,
                                                             kDelayInSeconds);
   }
 }
 
 
@@ skipping 69 matching lines @@
     }
     // The Step() above could have finished incremental marking.
     if (!incremental_marking->IsStopped()) {
       job_->ScheduleDelayedTask(heap);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8