Use idle task to perform incremental marking steps.

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

 // 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.
 
 #include "src/heap/gc-idle-time-handler.h"
 
 #include "src/flags.h"
 #include "src/heap/gc-tracer.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
 const double GCIdleTimeHandler::kConservativeTimeRatio = 0.9;
 const size_t GCIdleTimeHandler::kMaxMarkCompactTimeInMs = 1000;
 const size_t GCIdleTimeHandler::kMaxFinalIncrementalMarkCompactTimeInMs = 1000;
 const double GCIdleTimeHandler::kHighContextDisposalRate = 100;
 const size_t GCIdleTimeHandler::kMinTimeForOverApproximatingWeakClosureInMs = 1;
 
 
 void GCIdleTimeAction::Print() {
   switch (type) {
     case DONE:
       PrintF("done");
       break;
     case DO_NOTHING:
       PrintF("no action");
       break;
-    case DO_INCREMENTAL_MARKING:
-      PrintF("incremental marking with step %" V8_PTR_PREFIX "d / ms",
-             parameter);
+    case DO_INCREMENTAL_STEP:
+      PrintF("incremental step");
       if (additional_work) {
         PrintF("; finalized marking");
       }
       break;
     case DO_SCAVENGE:
       PrintF("scavenge");
       break;
     case DO_FULL_GC:
       PrintF("full GC");
       break;
-    case DO_FINALIZE_SWEEPING:
-      PrintF("finalize sweeping");
-      break;
   }
 }
 
 
 void GCIdleTimeHandler::HeapState::Print() {
   PrintF("contexts_disposed=%d ", contexts_disposed);
   PrintF("contexts_disposal_rate=%f ", contexts_disposal_rate);
   PrintF("size_of_objects=%" V8_PTR_PREFIX "d ", size_of_objects);
   PrintF("incremental_marking_stopped=%d ", incremental_marking_stopped);
   PrintF("sweeping_in_progress=%d ", sweeping_in_progress);
@@ skipping 209 matching lines @@
   }
 
   if (ShouldDoScavenge(
           static_cast<size_t>(idle_time_in_ms), heap_state.new_space_capacity,
           heap_state.used_new_space_size,
           heap_state.scavenge_speed_in_bytes_per_ms,
           heap_state.new_space_allocation_throughput_in_bytes_per_ms)) {
     return GCIdleTimeAction::Scavenge();
   }
 
-  if (heap_state.sweeping_in_progress) {
-    if (heap_state.sweeping_completed) {
-      return GCIdleTimeAction::FinalizeSweeping();
-    } else {
-      return NothingOrDone(idle_time_in_ms);
-    }
-  }
-
   if (!FLAG_incremental_marking || heap_state.incremental_marking_stopped) {
     return GCIdleTimeAction::Done();
   }
 
-  size_t step_size = EstimateMarkingStepSize(
-      static_cast<size_t>(kIncrementalMarkingStepTimeInMs),
-      heap_state.incremental_marking_speed_in_bytes_per_ms);
-  return GCIdleTimeAction::IncrementalMarking(step_size);
+  return GCIdleTimeAction::IncrementalStep();
 }
 
 
 }
 }