blob: f14330ea8a679c980e5c3ff5da1d43e18ca8159f [file] [log] [blame]
// 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/common/globals.h"
namespace v8 {
namespace internal {
enum class GCIdleTimeAction : uint8_t {
class GCIdleTimeHeapState {
void Print();
int contexts_disposed;
double contexts_disposal_rate;
size_t size_of_objects;
bool incremental_marking_stopped;
// The idle time handler makes decisions about which garbage collection
// operations are executing during IdleNotification.
class V8_EXPORT_PRIVATE GCIdleTimeHandler {
// If we haven't recorded any incremental marking events yet, we carefully
// mark with a conservative lower bound for the marking speed.
static const size_t kInitialConservativeMarkingSpeed = 100 * KB;
// Maximum marking step size returned by EstimateMarkingStepSize.
static const size_t kMaximumMarkingStepSize = 700 * MB;
// We have to make sure that we finish the IdleNotification before
// idle_time_in_ms. Hence, we conservatively prune our workload estimate.
static const double kConservativeTimeRatio;
// This is the maximum scheduled idle time. Note that it can be more than
// 16.66 ms when there is currently no rendering going on.
static const size_t kMaxScheduledIdleTime = 50;
static const size_t kMaxHeapSizeForContextDisposalMarkCompact = 100 * MB;
// If contexts are disposed at a higher rate a full gc is triggered.
static const double kHighContextDisposalRate;
GCIdleTimeHandler() = default;
GCIdleTimeAction Compute(double idle_time_in_ms,
GCIdleTimeHeapState heap_state);
bool Enabled();
static size_t EstimateMarkingStepSize(double idle_time_in_ms,
double marking_speed_in_bytes_per_ms);
static double EstimateFinalIncrementalMarkCompactTime(
size_t size_of_objects, double mark_compact_speed_in_bytes_per_ms);
static bool ShouldDoContextDisposalMarkCompact(int context_disposed,
double contexts_disposal_rate,
size_t size_of_objects);
} // namespace internal
} // namespace v8