incremental-marking-job.cc 2.3 KB
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// 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/heap/incremental-marking-job.h"

#include "src/base/platform/time.h"
#include "src/heap/heap-inl.h"
#include "src/heap/heap.h"
#include "src/heap/incremental-marking.h"
#include "src/isolate.h"
#include "src/v8.h"
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#include "src/vm-state-inl.h"
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namespace v8 {
namespace internal {

void IncrementalMarkingJob::Start(Heap* heap) {
  DCHECK(!heap->incremental_marking()->IsStopped());
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  ScheduleTask(heap);
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}

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void IncrementalMarkingJob::ScheduleTask(Heap* heap) {
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  if (!task_pending_ && !heap->IsTearingDown()) {
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    v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(heap->isolate());
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    task_pending_ = true;
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    auto task = new Task(heap->isolate(), this);
    V8::GetCurrentPlatform()->CallOnForegroundThread(isolate, task);
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  }
}

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void IncrementalMarkingJob::Task::Step(Heap* heap) {
  const int kIncrementalMarkingDelayMs = 1;
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  double deadline =
      heap->MonotonicallyIncreasingTimeInMs() + kIncrementalMarkingDelayMs;
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  heap->incremental_marking()->AdvanceIncrementalMarking(
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      deadline, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD,
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      i::StepOrigin::kTask);
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  heap->FinalizeIncrementalMarkingIfComplete(
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      GarbageCollectionReason::kFinalizeMarkingViaTask);
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}

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void IncrementalMarkingJob::Task::RunInternal() {
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  VMState<GC> state(isolate());
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  TRACE_EVENT_CALL_STATS_SCOPED(isolate(), "v8", "V8.Task");
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  Heap* heap = isolate()->heap();
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  IncrementalMarking* incremental_marking = heap->incremental_marking();
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  if (incremental_marking->IsStopped()) {
    if (heap->IncrementalMarkingLimitReached() !=
        Heap::IncrementalMarkingLimit::kNoLimit) {
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      heap->StartIncrementalMarking(heap->GCFlagsForIncrementalMarking(),
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                                    GarbageCollectionReason::kIdleTask,
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                                    kGCCallbackScheduleIdleGarbageCollection);
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    }
  }
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  // Clear this flag after StartIncrementalMarking call to avoid
  // scheduling a new task when startining incremental marking.
  job_->task_pending_ = false;

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  if (!incremental_marking->IsStopped()) {
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    Step(heap);
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    if (!incremental_marking->IsStopped()) {
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      job_->ScheduleTask(heap);
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    }
  }
}

}  // namespace internal
}  // namespace v8