Use idle task to perform incremental marking steps.

src/heap/heap.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/bits.h"
 #include "src/base/once.h"
@@ skipping 4752 matching lines @@
 
 
 void Heap::ReduceNewSpaceSize() {
   if (!FLAG_predictable && HasLowAllocationRate()) {
     new_space_.Shrink();
     UncommitFromSpace();
   }
 }
 
 
-bool Heap::TryFinalizeIdleIncrementalMarking(
-    double idle_time_in_ms, size_t size_of_objects,
-    size_t final_incremental_mark_compact_speed_in_bytes_per_ms) {
+bool Heap::TryFinalizeIdleIncrementalMarking(double idle_time_in_ms) {
+  size_t size_of_objects = static_cast<size_t>(SizeOfObjects());
+  size_t final_incremental_mark_compact_speed_in_bytes_per_ms =
+      static_cast<size_t>(
+          tracer()->FinalIncrementalMarkCompactSpeedInBytesPerMillisecond());
   if (FLAG_overapproximate_weak_closure &&
       (incremental_marking()->IsReadyToOverApproximateWeakClosure() ||
        (!incremental_marking()->weak_closure_was_overapproximated() &&
         mark_compact_collector_.marking_deque()->IsEmpty() &&
         gc_idle_time_handler_.ShouldDoOverApproximateWeakClosure(
             static_cast<size_t>(idle_time_in_ms))))) {
     OverApproximateWeakClosure(
         "Idle notification: overapproximate weak closure");
     return true;
   } else if (incremental_marking()->IsComplete() ||
              (mark_compact_collector_.marking_deque()->IsEmpty() &&
               gc_idle_time_handler_.ShouldDoFinalIncrementalMarkCompact(
                   static_cast<size_t>(idle_time_in_ms), size_of_objects,
                   final_incremental_mark_compact_speed_in_bytes_per_ms))) {
     CollectAllGarbage(kNoGCFlags, "idle notification: finalize incremental");
     return true;
   }
   return false;
 }
 
 
 GCIdleTimeHandler::HeapState Heap::ComputeHeapState() {
   GCIdleTimeHandler::HeapState heap_state;
   heap_state.contexts_disposed = contexts_disposed_;
   heap_state.contexts_disposal_rate =
       tracer()->ContextDisposalRateInMilliseconds();
-  heap_state.size_of_objects = static_cast<size_t>(SizeOfObjects());
   heap_state.incremental_marking_stopped = incremental_marking()->IsStopped();
-  heap_state.sweeping_in_progress =
-      mark_compact_collector()->sweeping_in_progress();
-  heap_state.sweeping_completed =
-      mark_compact_collector()->IsSweepingCompleted();
   heap_state.mark_compact_speed_in_bytes_per_ms =
       static_cast<size_t>(tracer()->MarkCompactSpeedInBytesPerMillisecond());
-  heap_state.incremental_marking_speed_in_bytes_per_ms = static_cast<size_t>(
-      tracer()->IncrementalMarkingSpeedInBytesPerMillisecond());
-  heap_state.final_incremental_mark_compact_speed_in_bytes_per_ms =
-      static_cast<size_t>(
-          tracer()->FinalIncrementalMarkCompactSpeedInBytesPerMillisecond());
   heap_state.scavenge_speed_in_bytes_per_ms =
       static_cast<size_t>(tracer()->ScavengeSpeedInBytesPerMillisecond());
   heap_state.used_new_space_size = new_space_.Size();
   heap_state.new_space_capacity = new_space_.Capacity();
   heap_state.new_space_allocation_throughput_in_bytes_per_ms =
       tracer()->NewSpaceAllocationThroughputInBytesPerMillisecond();
   return heap_state;
 }
 
 
@@ skipping 24 matching lines @@
 
 
 bool Heap::PerformIdleTimeAction(GCIdleTimeAction action,
                                  GCIdleTimeHandler::HeapState heap_state,
                                  double deadline_in_ms) {
   bool result = false;
   switch (action.type) {
     case DONE:
       result = true;
       break;
-    case DO_INCREMENTAL_MARKING: {
-      const double remaining_idle_time_in_ms =
-          AdvanceIncrementalMarking(action.parameter, deadline_in_ms,
-                                    IncrementalMarking::NoForcedStepActions());
-      if (remaining_idle_time_in_ms > 0.0) {
-        action.additional_work = TryFinalizeIdleIncrementalMarking(
-            remaining_idle_time_in_ms, heap_state.size_of_objects,
-            heap_state.final_incremental_mark_compact_speed_in_bytes_per_ms);
+    case DO_INCREMENTAL_STEP: {
+      if (incremental_marking()->IsIncrementalMarkingTaskPending() ||
+          IncrementalMarkingTask::Step(this, deadline_in_ms) ==
+              IncrementalMarkingTask::kDone) {
+        result = true;
       }
       break;
     }
     case DO_FULL_GC: {
       DCHECK(contexts_disposed_ > 0);
       HistogramTimerScope scope(isolate_->counters()->gc_context());
       CollectAllGarbage(kNoGCFlags, "idle notification: contexts disposed");
       break;
     }
     case DO_SCAVENGE:
       CollectGarbage(NEW_SPACE, "idle notification: scavenge");
       break;
-    case DO_FINALIZE_SWEEPING:
-      mark_compact_collector()->EnsureSweepingCompleted();
-      break;
     case DO_NOTHING:
       break;
   }
 
   return result;
 }
 
 
 void Heap::IdleNotificationEpilogue(GCIdleTimeAction action,
                                     GCIdleTimeHandler::HeapState heap_state,
@@ skipping 2009 matching lines @@
     *object_type = "CODE_TYPE";                                                \
     *object_sub_type = "CODE_AGE/" #name;                                      \
     return true;
     CODE_AGE_LIST_COMPLETE(COMPARE_AND_RETURN_NAME)
 #undef COMPARE_AND_RETURN_NAME
   }
   return false;
 }
 }  // namespace internal
 }  // namespace v8