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// Copyright 2016 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_ZONE_ACCOUNTING_ALLOCATOR_H_
#define V8_ZONE_ACCOUNTING_ALLOCATOR_H_
#include "include/v8-platform.h"
#include "src/base/atomic-utils.h"
#include "src/base/atomicops.h"
#include "src/base/macros.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/semaphore.h"
#include "src/base/platform/time.h"
#include "src/zone/zone-segment.h"
#include "testing/gtest/include/gtest/gtest_prod.h" // nogncheck
namespace v8 {
namespace internal {
class V8_EXPORT_PRIVATE AccountingAllocator {
public:
static const size_t kMaxPoolSize = 8ul * KB;
AccountingAllocator();
virtual ~AccountingAllocator();
// Gets an empty segment from the pool or creates a new one.
virtual Segment* GetSegment(size_t bytes);
// Return unneeded segments to either insert them into the pool or release
// them if the pool is already full or memory pressure is high.
virtual void ReturnSegment(Segment* memory);
size_t GetCurrentMemoryUsage() const;
size_t GetMaxMemoryUsage() const;
size_t GetCurrentPoolSize() const;
void MemoryPressureNotification(MemoryPressureLevel level);
// Configures the zone segment pool size limits so the pool does not
// grow bigger than max_pool_size.
// TODO(heimbuef): Do not accept segments to pool that are larger than
// their size class requires. Sometimes the zones generate weird segments.
void ConfigureSegmentPool(const size_t max_pool_size);
virtual void ZoneCreation(const Zone* zone) {}
virtual void ZoneDestruction(const Zone* zone) {}
private:
FRIEND_TEST(Zone, SegmentPoolConstraints);
static const size_t kMinSegmentSizePower = 13;
static const size_t kMaxSegmentSizePower = 18;
STATIC_ASSERT(kMinSegmentSizePower <= kMaxSegmentSizePower);
static const size_t kNumberBuckets =
1 + kMaxSegmentSizePower - kMinSegmentSizePower;
// Allocates a new segment. Returns nullptr on failed allocation.
Segment* AllocateSegment(size_t bytes);
void FreeSegment(Segment* memory);
// Returns a segment from the pool of at least the requested size.
Segment* GetSegmentFromPool(size_t requested_size);
// Trys to add a segment to the pool. Returns false if the pool is full.
bool AddSegmentToPool(Segment* segment);
// Empties the pool and puts all its contents onto the garbage stack.
void ClearPool();
Segment* unused_segments_heads_[kNumberBuckets];
size_t unused_segments_sizes_[kNumberBuckets];
size_t unused_segments_max_sizes_[kNumberBuckets];
base::Mutex unused_segments_mutex_;
base::AtomicWord current_memory_usage_ = 0;
base::AtomicWord max_memory_usage_ = 0;
base::AtomicWord current_pool_size_ = 0;
base::AtomicValue<MemoryPressureLevel> memory_pressure_level_;
DISALLOW_COPY_AND_ASSIGN(AccountingAllocator);
};
} // namespace internal
} // namespace v8
#endif // V8_ZONE_ACCOUNTING_ALLOCATOR_H_
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