Remove high promotion mode

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 1365 matching lines @@
 
   // This should be used only for testing.
   void set_old_generation_allocation_counter(size_t new_value) {
     old_generation_allocation_counter_ = new_value;
   }
 
   size_t PromotedSinceLastGC() {
     return PromotedSpaceSizeOfObjects() - old_generation_size_at_last_gc_;
   }
 
-  // Record the fact that we generated some optimized code since the last GC
-  // which will pretenure some previously unpretenured allocation.
-  void RecordDeoptForPretenuring() { gathering_lifetime_feedback_ = 2; }
-
   // Update GC statistics that are tracked on the Heap.
   void UpdateCumulativeGCStatistics(double duration, double spent_in_mutator,
                                     double marking_time);
 
   // Returns maximum GC pause.
   double get_max_gc_pause() { return max_gc_pause_; }
 
   // Returns maximum size of objects alive after GC.
   intptr_t get_max_alive_after_gc() { return max_alive_after_gc_; }
 
@@ skipping 771 matching lines @@
 
   // Initializes the allocation sites scratchpad with undefined values.
   void InitializeAllocationSitesScratchpad();
 
   // Adds an allocation site to the scratchpad if there is space left.
   void AddAllocationSiteToScratchpad(AllocationSite* site,
                                      ScratchpadSlotMode mode);
 
   void UpdateSurvivalStatistics(int start_new_space_size);
 
-  enum SurvivalRateTrend { INCREASING, STABLE, DECREASING, FLUCTUATING };
-
   static const int kYoungSurvivalRateHighThreshold = 90;
-  static const int kYoungSurvivalRateLowThreshold = 10;
   static const int kYoungSurvivalRateAllowedDeviation = 15;
 
   static const int kOldSurvivalRateLowThreshold = 10;
 
-  bool new_space_high_promotion_mode_active_;
-  // If this is non-zero, then there is hope yet that the optimized code we
-  // have generated will solve our high promotion rate problems, so we don't
-  // need to go into high promotion mode just yet.
-  int gathering_lifetime_feedback_;
   int high_survival_rate_period_length_;
   intptr_t promoted_objects_size_;
-  int low_survival_rate_period_length_;
-  double survival_rate_;
   double promotion_ratio_;
   double promotion_rate_;
   intptr_t semi_space_copied_object_size_;
   intptr_t previous_semi_space_copied_object_size_;
   double semi_space_copied_rate_;
   int nodes_died_in_new_space_;
   int nodes_copied_in_new_space_;
   int nodes_promoted_;
 
   // This is the pretenuring trigger for allocation sites that are in maybe
   // tenure state. When we switched to the maximum new space size we deoptimize
   // the code that belongs to the allocation site and derive the lifetime
   // of the allocation site.
   unsigned int maximum_size_scavenges_;
 
-  SurvivalRateTrend previous_survival_rate_trend_;
-  SurvivalRateTrend survival_rate_trend_;
-
-  void set_survival_rate_trend(SurvivalRateTrend survival_rate_trend) {
-    DCHECK(survival_rate_trend != FLUCTUATING);
-    previous_survival_rate_trend_ = survival_rate_trend_;
-    survival_rate_trend_ = survival_rate_trend;
-  }
-
-  SurvivalRateTrend survival_rate_trend() {
-    if (survival_rate_trend_ == STABLE) {
-      return STABLE;
-    } else if (previous_survival_rate_trend_ == STABLE) {
-      return survival_rate_trend_;
-    } else if (survival_rate_trend_ != previous_survival_rate_trend_) {
-      return FLUCTUATING;
-    } else {
-      return survival_rate_trend_;
-    }
-  }
-
-  bool IsStableOrIncreasingSurvivalTrend() {
-    switch (survival_rate_trend()) {
-      case STABLE:
-      case INCREASING:
-        return true;
-      default:
-        return false;
-    }
-  }
-
-  bool IsStableOrDecreasingSurvivalTrend() {
-    switch (survival_rate_trend()) {
-      case STABLE:
-      case DECREASING:
-        return true;
-      default:
-        return false;
-    }
-  }
-
-  bool IsIncreasingSurvivalTrend() {
-    return survival_rate_trend() == INCREASING;
-  }
-
-  bool IsLowSurvivalRate() { return low_survival_rate_period_length_ > 0; }
-
+  // TODO(hpayer): Allocation site pretenuring may make this method obsolete.
+  // Re-visit incremental marking heuristics.
   bool IsHighSurvivalRate() { return high_survival_rate_period_length_ > 0; }
 
   void ConfigureInitialOldGenerationSize();
 
-  void ConfigureNewGenerationSize();
-
   void SelectScavengingVisitorsTable();
 
   bool HasLowYoungGenerationAllocationRate();
   bool HasLowOldGenerationAllocationRate();
 
   void ReduceNewSpaceSize();
 
   bool TryFinalizeIdleIncrementalMarking(
       double idle_time_in_ms, size_t size_of_objects,
       size_t mark_compact_speed_in_bytes_per_ms);
@@ skipping 596 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_