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// Copyright 2015 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/minor-gc-job.h"
#include "src/base/platform/time.h"
#include "src/execution/isolate.h"
#include "src/execution/vm-state-inl.h"
#include "src/flags/flags.h"
#include "src/heap/heap-inl.h"
#include "src/heap/heap.h"
#include "src/init/v8.h"
namespace v8 {
namespace internal {
class MinorGCJob::Task : public CancelableTask {
public:
Task(Isolate* isolate, MinorGCJob* job)
: CancelableTask(isolate), isolate_(isolate), job_(job) {}
// CancelableTask overrides.
void RunInternal() override;
Isolate* isolate() const { return isolate_; }
private:
Isolate* const isolate_;
MinorGCJob* const job_;
};
size_t MinorGCJob::YoungGenerationTaskTriggerSize(Heap* heap) {
return heap->new_space()->TotalCapacity() * v8_flags.minor_gc_task_trigger /
100;
}
bool MinorGCJob::YoungGenerationSizeTaskTriggerReached(Heap* heap) {
return heap->new_space()->Size() >= YoungGenerationTaskTriggerSize(heap);
}
void MinorGCJob::ScheduleTaskIfNeeded(Heap* heap) {
if (!v8_flags.minor_gc_task) return;
if (task_pending_) return;
if (heap->IsTearingDown()) return;
if (!YoungGenerationSizeTaskTriggerReached(heap)) return;
v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(heap->isolate());
auto taskrunner = V8::GetCurrentPlatform()->GetForegroundTaskRunner(isolate);
if (taskrunner->NonNestableTasksEnabled()) {
taskrunner->PostNonNestableTask(
std::make_unique<Task>(heap->isolate(), this));
task_pending_ = true;
}
}
void MinorGCJob::Task::RunInternal() {
VMState<GC> state(isolate());
TRACE_EVENT_CALL_STATS_SCOPED(isolate(), "v8", "V8.Task");
job_->task_pending_ = false;
if (v8_flags.minor_mc &&
isolate()->heap()->incremental_marking()->IsMajorMarking()) {
// Don't trigger a MinorMC cycle while major incremental marking is active.
return;
}
if (!MinorGCJob::YoungGenerationSizeTaskTriggerReached(isolate()->heap()))
return;
isolate()->heap()->CollectGarbage(NEW_SPACE, GarbageCollectionReason::kTask);
}
} // namespace internal
} // namespace v8
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