Server : Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips PHP/7.4.20 System : Linux st2.domain.com 3.10.0-1127.10.1.el7.x86_64 #1 SMP Wed Jun 3 14:28:03 UTC 2020 x86_64 User : apache ( 48) PHP Version : 7.4.20 Disable Function : NONE Directory : /home/real/node-v13.0.1/deps/v8/src/heap/ |
// 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.
#ifndef V8_HEAP_HEAP_CONTROLLER_H_
#define V8_HEAP_HEAP_CONTROLLER_H_
#include <cstddef>
#include "src/heap/heap.h"
#include "src/utils/allocation.h"
#include "testing/gtest/include/gtest/gtest_prod.h" // nogncheck
namespace v8 {
namespace internal {
struct BaseControllerTrait {
static constexpr size_t kMinSize = 128u * Heap::kPointerMultiplier * MB;
static constexpr size_t kMaxSize = 1024u * Heap::kPointerMultiplier * MB;
static constexpr double kMinGrowingFactor = 1.1;
static constexpr double kMaxGrowingFactor = 4.0;
static constexpr double kConservativeGrowingFactor = 1.3;
static constexpr double kTargetMutatorUtilization = 0.97;
};
struct V8HeapTrait : public BaseControllerTrait {
static const char* kName;
};
struct GlobalMemoryTrait : public BaseControllerTrait {
static const char* kName;
};
template <typename Trait>
class V8_EXPORT_PRIVATE MemoryController : public AllStatic {
public:
// Computes the growing step when the limit increases.
static size_t MinimumAllocationLimitGrowingStep(
Heap::HeapGrowingMode growing_mode);
static double GrowingFactor(Heap* heap, size_t max_heap_size, double gc_speed,
double mutator_speed);
static size_t CalculateAllocationLimit(Heap* heap, size_t current_size,
size_t min_size, size_t max_size,
size_t new_space_capacity,
double factor,
Heap::HeapGrowingMode growing_mode);
private:
static double MaxGrowingFactor(size_t max_heap_size);
static double DynamicGrowingFactor(double gc_speed, double mutator_speed,
double max_factor);
FRIEND_TEST(MemoryControllerTest, HeapGrowingFactor);
FRIEND_TEST(MemoryControllerTest, MaxHeapGrowingFactor);
};
} // namespace internal
} // namespace v8
#endif // V8_HEAP_HEAP_CONTROLLER_H_