Revert of [heap] Add page evacuation mode for new->new

test/cctest/heap/test-heap.cc

 // Copyright 2012 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 6542 matching lines @@
     heap::SimulateIncrementalMarking(heap);
     for (size_t j = 0; j < arrays.size(); j++) {
       heap->RightTrimFixedArray<Heap::CONCURRENT_TO_SWEEPER>(arrays[j], N - 1);
     }
   }
   // Force allocation from the free list.
   heap->set_force_oom(true);
   heap->CollectGarbage(OLD_SPACE);
 }
 
+UNINITIALIZED_TEST(PagePromotion) {
+  FLAG_page_promotion = true;
+  FLAG_page_promotion_threshold = 0;  // %
+  i::FLAG_min_semi_space_size = 8 * (Page::kPageSize / MB);
+  // We cannot optimize for size as we require a new space with more than one
+  // page.
+  i::FLAG_optimize_for_size = false;
+  // Set max_semi_space_size because it could've been initialized by an
+  // implication of optimize_for_size.
+  i::FLAG_max_semi_space_size = i::FLAG_min_semi_space_size;
+  v8::Isolate::CreateParams create_params;
+  create_params.array_buffer_allocator = CcTest::array_buffer_allocator();
+  v8::Isolate* isolate = v8::Isolate::New(create_params);
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  {
+    v8::Isolate::Scope isolate_scope(isolate);
+    v8::HandleScope handle_scope(isolate);
+    v8::Context::New(isolate)->Enter();
+    Heap* heap = i_isolate->heap();
+
+    // Clean up any left over objects from cctest initialization.
+    heap->CollectAllGarbage();
+    heap->CollectAllGarbage();
+
+    std::vector<Handle<FixedArray>> handles;
+    heap::SimulateFullSpace(heap->new_space(), &handles);
+    heap->CollectGarbage(NEW_SPACE);
+    CHECK_GT(handles.size(), 0u);
+    // First object in handle should be on the first page.
+    Handle<FixedArray> first_object = handles.front();
+    Page* first_page = Page::FromAddress(first_object->address());
+    // The age mark should not be on the first page.
+    CHECK(!first_page->ContainsLimit(heap->new_space()->age_mark()));
+    // To perform a sanity check on live bytes we need to mark the heap.
+    heap::SimulateIncrementalMarking(heap, true);
+    // Sanity check that the page meets the requirements for promotion.
+    const int threshold_bytes =
+        FLAG_page_promotion_threshold * Page::kAllocatableMemory / 100;
+    CHECK_GE(first_page->LiveBytes(), threshold_bytes);
+
+    // Actual checks: The page is in new space first, but is moved to old space
+    // during a full GC.
+    CHECK(heap->new_space()->ContainsSlow(first_page->address()));
+    CHECK(!heap->old_space()->ContainsSlow(first_page->address()));
+    heap->CollectGarbage(OLD_SPACE);
+    CHECK(!heap->new_space()->ContainsSlow(first_page->address()));
+    CHECK(heap->old_space()->ContainsSlow(first_page->address()));
+  }
+}
+
 TEST(Regress598319) {
   // This test ensures that no white objects can cross the progress bar of large
   // objects during incremental marking. It checks this by using Shift() during
   // incremental marking.
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());
   Heap* heap = CcTest::heap();
   Isolate* isolate = heap->isolate();
 
   const int kNumberOfObjects = Page::kMaxRegularHeapObjectSize / kPointerSize;
@@ skipping 151 matching lines @@
   int mark_sweeps_performed = mark_sweep_count_after - mark_sweep_count_before;
   // The memory pressuer handler either performed two GCs or performed one and
   // started incremental marking.
   CHECK(mark_sweeps_performed == 2 ||
         (mark_sweeps_performed == 1 &&
          !heap->incremental_marking()->IsStopped()));
 }
 
 }  // namespace internal
 }  // namespace v8