Perform scavenge in idle tasks.

src/heap/gc-idle-time-handler.h

 // Copyright 2014 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_GC_IDLE_TIME_HANDLER_H_
 #define V8_HEAP_GC_IDLE_TIME_HANDLER_H_
 
 #include "src/globals.h"
 
 namespace v8 {
 namespace internal {
 
 enum GCIdleTimeActionType {
   DONE,
   DO_NOTHING,
   DO_INCREMENTAL_STEP,
-  DO_SCAVENGE,
   DO_FULL_GC,
 };
 
 
 class GCIdleTimeAction {
  public:
   static GCIdleTimeAction Done() {
     GCIdleTimeAction result;
     result.type = DONE;
     result.additional_work = false;
     return result;
   }
 
   static GCIdleTimeAction Nothing() {
     GCIdleTimeAction result;
     result.type = DO_NOTHING;
     result.additional_work = false;
     return result;
   }
 
   static GCIdleTimeAction IncrementalStep() {
     GCIdleTimeAction result;
     result.type = DO_INCREMENTAL_STEP;
     result.additional_work = false;
     return result;
   }
 
-  static GCIdleTimeAction Scavenge() {
-    GCIdleTimeAction result;
-    result.type = DO_SCAVENGE;
-    result.additional_work = false;
-    return result;
-  }
-
   static GCIdleTimeAction FullGC() {
     GCIdleTimeAction result;
     result.type = DO_FULL_GC;
     result.additional_work = false;
     return result;
   }
 
   void Print();
 
   GCIdleTimeActionType type;
@@ skipping 36 matching lines @@
 
   // This is the maximum scheduled idle time. Note that it can be more than
   // 16.66 ms when there is currently no rendering going on.
   static const size_t kMaxScheduledIdleTime = 50;
 
   // The maximum idle time when frames are rendered is 16.66ms.
   static const size_t kMaxFrameRenderingIdleTime = 17;
 
   static const int kMinBackgroundIdleTime = 900;
 
-  // We conservatively assume that in the next kTimeUntilNextIdleEvent ms
-  // no idle notification happens.
-  static const size_t kTimeUntilNextIdleEvent = 100;
-
   // An allocation throughput below kLowAllocationThroughput bytes/ms is
   // considered low
   static const size_t kLowAllocationThroughput = 1000;
 
-  // If we haven't recorded any scavenger events yet, we use a conservative
-  // lower bound for the scavenger speed.
-  static const size_t kInitialConservativeScavengeSpeed = 100 * KB;
-
-  // The minimum size of allocated new space objects to trigger a scavenge.
-  static const size_t kMinimumNewSpaceSizeToPerformScavenge = MB / 2;
-
   // If contexts are disposed at a higher rate a full gc is triggered.
   static const double kHighContextDisposalRate;
 
   // Incremental marking step time.
   static const size_t kIncrementalMarkingStepTimeInMs = 1;
 
   static const size_t kMinTimeForOverApproximatingWeakClosureInMs;
 
   // Number of times we will return a Nothing action in the current mode
   // despite having idle time available before we returning a Done action to
   // ensure we don't keep scheduling idle tasks and making no progress.
   static const int kMaxNoProgressIdleTimes = 10;
 
   class HeapState {
    public:
     void Print();
 
     int contexts_disposed;
     double contexts_disposal_rate;
     size_t size_of_objects;
     bool incremental_marking_stopped;
     bool sweeping_in_progress;
     bool sweeping_completed;
     bool has_low_allocation_rate;
     size_t mark_compact_speed_in_bytes_per_ms;
     size_t incremental_marking_speed_in_bytes_per_ms;
     size_t final_incremental_mark_compact_speed_in_bytes_per_ms;
-    size_t scavenge_speed_in_bytes_per_ms;
-    size_t used_new_space_size;
-    size_t new_space_capacity;
-    size_t new_space_allocation_throughput_in_bytes_per_ms;
   };
 
   GCIdleTimeHandler() : idle_times_which_made_no_progress_(0) {}
 
   GCIdleTimeAction Compute(double idle_time_in_ms, HeapState heap_state);
 
   void ResetNoProgressCounter() { idle_times_which_made_no_progress_ = 0; }
 
   static size_t EstimateMarkingStepSize(size_t idle_time_in_ms,
                                         size_t marking_speed_in_bytes_per_ms);
@@ skipping 10 matching lines @@
 
   static bool ShouldDoContextDisposalMarkCompact(int context_disposed,
                                                  double contexts_disposal_rate);
 
   static bool ShouldDoFinalIncrementalMarkCompact(
       size_t idle_time_in_ms, size_t size_of_objects,
       size_t final_incremental_mark_compact_speed_in_bytes_per_ms);
 
   static bool ShouldDoOverApproximateWeakClosure(size_t idle_time_in_ms);
 
-  static bool ShouldDoScavenge(
-      size_t idle_time_in_ms, size_t new_space_size, size_t used_new_space_size,
-      size_t scavenger_speed_in_bytes_per_ms,
-      size_t new_space_allocation_throughput_in_bytes_per_ms);
-
  private:
   GCIdleTimeAction NothingOrDone(double idle_time_in_ms);
 
   // Idle notifications with no progress.
   int idle_times_which_made_no_progress_;
 
   DISALLOW_COPY_AND_ASSIGN(GCIdleTimeHandler);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_GC_IDLE_TIME_HANDLER_H_