[heap] New heuristics for starting of incremental marking.

src/heap/heap.h

 // 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 690 matching lines @@
   static inline void CopyBlock(Address dst, Address src, int byte_size);
 
   // Determines a static visitor id based on the given {map} that can then be
   // stored on the map to facilitate fast dispatch for {StaticVisitorBase}.
   static int GetStaticVisitorIdForMap(Map* map);
 
   // Notifies the heap that is ok to start marking or other activities that
   // should not happen during deserialization.
   void NotifyDeserializationComplete();
 
-  intptr_t old_generation_allocation_limit() const {
-    return old_generation_allocation_limit_;
-  }
-
-  bool always_allocate() { return always_allocate_scope_count_.Value() != 0; }
-
   inline Address* NewSpaceAllocationTopAddress();
   inline Address* NewSpaceAllocationLimitAddress();
   inline Address* OldSpaceAllocationTopAddress();
   inline Address* OldSpaceAllocationLimitAddress();
 
-  bool CanExpandOldGeneration(int size) {
-    if (force_oom_) return false;
-    return (OldGenerationCapacity() + size) < MaxOldGenerationSize();
-  }
-
   // Clear the Instanceof cache (used when a prototype changes).
   inline void ClearInstanceofCache();
 
   // FreeSpace objects have a null map after deserialization. Update the map.
   void RepairFreeListsAfterDeserialization();
 
   // Move len elements within a given array from src_index index to dst_index
   // index.
   void MoveElements(FixedArray* array, int dst_index, int src_index, int len);
 
@@ skipping 102 matching lines @@
                                   bool is_isolate_locked);
   void CheckMemoryPressure();
 
   double MonotonicallyIncreasingTimeInMs();
 
   void RecordStats(HeapStats* stats, bool take_snapshot = false);
 
   // Check new space expansion criteria and expand semispaces if it was hit.
   void CheckNewSpaceExpansionCriteria();
 
-  inline bool HeapIsFullEnoughToStartIncrementalMarking(intptr_t limit);
-
   void VisitExternalResources(v8::ExternalResourceVisitor* visitor);
 
   // An object should be promoted if the object has survived a
   // scavenge operation.
   template <PromotionMode promotion_mode>
   inline bool ShouldBePromoted(Address old_address, int object_size);
 
   inline PromotionMode CurrentPromotionMode();
 
   void ClearNormalizedMapCaches();
 
   void IncrementDeferredCount(v8::Isolate::UseCounterFeature feature);
 
-  inline bool OldGenerationAllocationLimitReached();
-
   // Completely clear the Instanceof cache (to stop it keeping objects alive
   // around a GC).
   inline void CompletelyClearInstanceofCache();
 
   inline uint32_t HashSeed();
 
   inline int NextScriptId();
 
   inline void SetArgumentsAdaptorDeoptPCOffset(int pc_offset);
   inline void SetConstructStubDeoptPCOffset(int pc_offset);
@@ skipping 948 matching lines @@
   // given old generation size.
   intptr_t CalculateOldGenerationAllocationLimit(double factor,
                                                  intptr_t old_gen_size);
 
   // Sets the allocation limit to trigger the next full garbage collection.
   void SetOldGenerationAllocationLimit(intptr_t old_gen_size, double gc_speed,
                                        double mutator_speed);
 
   intptr_t MinimumAllocationLimitGrowingStep();
 
+  intptr_t old_generation_allocation_limit() const {
+    return old_generation_allocation_limit_;
+  }
+
+  bool always_allocate() { return always_allocate_scope_count_.Value() != 0; }
+
+  bool CanExpandOldGeneration(int size) {
+    if (force_oom_) return false;
+    return (OldGenerationCapacity() + size) < MaxOldGenerationSize();
+  }
+
+  bool ShouldExpandOldGenerationOnAllocationFailure();
+
+  enum class IncrementalMarkingLimit { kNoLimit, kSoftLimit, kHardLimit };
+  IncrementalMarkingLimit IncrementalMarkingLimitReached();
+
   // ===========================================================================
   // Idle notification. ========================================================
   // ===========================================================================
 
   bool RecentIdleNotificationHappened();
   void ScheduleIdleScavengeIfNeeded(int bytes_allocated);
 
   // ===========================================================================
   // HeapIterator helpers. =====================================================
   // ===========================================================================
@@ skipping 452 matching lines @@
   // Used for testing purposes.
   bool force_oom_;
 
   // Classes in "heap" can be friends.
   friend class AlwaysAllocateScope;
   friend class GCCallbacksScope;
   friend class GCTracer;
   friend class HeapIterator;
   friend class IdleScavengeObserver;
   friend class IncrementalMarking;
+  friend class IncrementalMarkingJob;
   friend class IteratePromotedObjectsVisitor;
+  friend class LargeObjectSpace;
   friend class MarkCompactCollector;
   friend class MarkCompactMarkingVisitor;
   friend class NewSpace;
   friend class ObjectStatsCollector;
   friend class Page;
+  friend class PagedSpace;
   friend class Scavenger;
   friend class StoreBuffer;
   friend class TestMemoryAllocatorScope;
 
   // The allocator interface.
   friend class Factory;
 
   // The Isolate constructs us.
   friend class Isolate;
 
@@ skipping 285 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_