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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/mutex.h"
#include "src/base/platform/time.h"
#include "src/execution/isolate.h"
#include "src/execution/vm-state-inl.h"
#include "src/heap/embedder-tracing.h"
#include "src/heap/gc-tracer.h"
#include "src/heap/heap-inl.h"
#include "src/heap/heap.h"
#include "src/heap/incremental-marking.h"
#include "src/init/v8.h"
namespace v8 {
namespace internal {
class IncrementalMarkingJob::Task : public CancelableTask {
public:
static StepResult Step(Heap* heap);
Task(Isolate* isolate, IncrementalMarkingJob* job,
EmbedderHeapTracer::EmbedderStackState stack_state, TaskType task_type)
: CancelableTask(isolate),
isolate_(isolate),
job_(job),
stack_state_(stack_state),
task_type_(task_type) {}
// CancelableTask overrides.
void RunInternal() override;
Isolate* isolate() const { return isolate_; }
private:
Isolate* const isolate_;
IncrementalMarkingJob* const job_;
const EmbedderHeapTracer::EmbedderStackState stack_state_;
const TaskType task_type_;
};
void IncrementalMarkingJob::Start(Heap* heap) {
DCHECK(!heap->incremental_marking()->IsStopped());
ScheduleTask(heap);
}
void IncrementalMarkingJob::ScheduleTask(Heap* heap, TaskType task_type) {
base::MutexGuard guard(&mutex_);
if (!IsTaskPending(task_type) && !heap->IsTearingDown() &&
FLAG_incremental_marking_task) {
v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(heap->isolate());
SetTaskPending(task_type, true);
auto taskrunner =
V8::GetCurrentPlatform()->GetForegroundTaskRunner(isolate);
const EmbedderHeapTracer::EmbedderStackState stack_state =
taskrunner->NonNestableTasksEnabled()
? EmbedderHeapTracer::EmbedderStackState::kNoHeapPointers
: EmbedderHeapTracer::EmbedderStackState::kMayContainHeapPointers;
auto task =
std::make_unique<Task>(heap->isolate(), this, stack_state, task_type);
if (task_type == TaskType::kNormal) {
scheduled_time_ = heap->MonotonicallyIncreasingTimeInMs();
if (taskrunner->NonNestableTasksEnabled()) {
taskrunner->PostNonNestableTask(std::move(task));
} else {
taskrunner->PostTask(std::move(task));
}
} else {
if (taskrunner->NonNestableDelayedTasksEnabled()) {
taskrunner->PostNonNestableDelayedTask(std::move(task),
kDelayInSeconds);
} else {
taskrunner->PostDelayedTask(std::move(task), kDelayInSeconds);
}
}
}
}
StepResult IncrementalMarkingJob::Task::Step(Heap* heap) {
const int kIncrementalMarkingDelayMs = 1;
double deadline =
heap->MonotonicallyIncreasingTimeInMs() + kIncrementalMarkingDelayMs;
StepResult result = heap->incremental_marking()->AdvanceWithDeadline(
deadline, i::IncrementalMarking::NO_GC_VIA_STACK_GUARD,
i::StepOrigin::kTask);
heap->FinalizeIncrementalMarkingIfComplete(
GarbageCollectionReason::kFinalizeMarkingViaTask);
return result;
}
void IncrementalMarkingJob::Task::RunInternal() {
VMState<GC> state(isolate());
TRACE_EVENT_CALL_STATS_SCOPED(isolate(), "v8", "V8.Task");
Heap* heap = isolate()->heap();
EmbedderStackStateScope scope(heap->local_embedder_heap_tracer(),
stack_state_);
if (task_type_ == TaskType::kNormal) {
heap->tracer()->RecordTimeToIncrementalMarkingTask(
heap->MonotonicallyIncreasingTimeInMs() - job_->scheduled_time_);
job_->scheduled_time_ = 0.0;
}
IncrementalMarking* incremental_marking = heap->incremental_marking();
if (incremental_marking->IsStopped()) {
if (heap->IncrementalMarkingLimitReached() !=
Heap::IncrementalMarkingLimit::kNoLimit) {
heap->StartIncrementalMarking(heap->GCFlagsForIncrementalMarking(),
GarbageCollectionReason::kTask,
kGCCallbackScheduleIdleGarbageCollection);
}
}
// Clear this flag after StartIncrementalMarking call to avoid
// scheduling a new task when starting incremental marking.
{
base::MutexGuard guard(&job_->mutex_);
job_->SetTaskPending(task_type_, false);
}
if (!incremental_marking->IsStopped()) {
// All objects are initialized at that point.
heap->new_space()->MarkLabStartInitialized();
heap->new_lo_space()->ResetPendingObject();
StepResult step_result = Step(heap);
if (!incremental_marking->IsStopped()) {
const TaskType task_type =
incremental_marking->finalize_marking_completed() ||
step_result != StepResult::kNoImmediateWork
? TaskType::kNormal
: TaskType::kDelayed;
job_->ScheduleTask(heap, task_type);
}
}
}
double IncrementalMarkingJob::CurrentTimeToTask(Heap* heap) const {
if (scheduled_time_ == 0.0) return 0.0;
return heap->MonotonicallyIncreasingTimeInMs() - scheduled_time_;
}
} // namespace internal
} // namespace v8
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