Line data    Source code

       1             : // Copyright 2016 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_ZONE_ACCOUNTING_ALLOCATOR_H_
       6             : #define V8_ZONE_ACCOUNTING_ALLOCATOR_H_
       7             : 
       8             : #include "include/v8-platform.h"
       9             : #include "include/v8.h"
      10             : #include "src/base/atomic-utils.h"
      11             : #include "src/base/atomicops.h"
      12             : #include "src/base/macros.h"
      13             : #include "src/base/platform/mutex.h"
      14             : #include "src/base/platform/semaphore.h"
      15             : #include "src/base/platform/time.h"
      16             : #include "src/zone/zone-segment.h"
      17             : #include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck
      18             : 
      19             : namespace v8 {
      20             : namespace internal {
      21             : 
      22             : class V8_EXPORT_PRIVATE AccountingAllocator {
      23             :  public:
      24             :   static const size_t kMaxPoolSize = 8ul * KB;
      25             : 
      26             :   AccountingAllocator();
      27             :   virtual ~AccountingAllocator();
      28             : 
      29             :   // Gets an empty segment from the pool or creates a new one.
      30             :   virtual Segment* GetSegment(size_t bytes);
      31             :   // Return unneeded segments to either insert them into the pool or release
      32             :   // them if the pool is already full or memory pressure is high.
      33             :   virtual void ReturnSegment(Segment* memory);
      34             : 
      35             :   size_t GetCurrentMemoryUsage() const;
      36             :   size_t GetMaxMemoryUsage() const;
      37             : 
      38             :   size_t GetCurrentPoolSize() const;
      39             : 
      40             :   void MemoryPressureNotification(MemoryPressureLevel level);
      41             :   // Configures the zone segment pool size limits so the pool does not
      42             :   // grow bigger than max_pool_size.
      43             :   // TODO(heimbuef): Do not accept segments to pool that are larger than
      44             :   // their size class requires. Sometimes the zones generate weird segments.
      45             :   void ConfigureSegmentPool(const size_t max_pool_size);
      46             : 
      47   102214313 :   virtual void ZoneCreation(const Zone* zone) {}
      48   102189376 :   virtual void ZoneDestruction(const Zone* zone) {}
      49             : 
      50             :  private:
      51             :   FRIEND_TEST(Zone, SegmentPoolConstraints);
      52             : 
      53             :   static const size_t kMinSegmentSizePower = 13;
      54             :   static const size_t kMaxSegmentSizePower = 18;
      55             : 
      56             :   STATIC_ASSERT(kMinSegmentSizePower <= kMaxSegmentSizePower);
      57             : 
      58             :   static const size_t kNumberBuckets =
      59             :       1 + kMaxSegmentSizePower - kMinSegmentSizePower;
      60             : 
      61             :   // Allocates a new segment. Returns nullptr on failed allocation.
      62             :   Segment* AllocateSegment(size_t bytes);
      63             :   void FreeSegment(Segment* memory);
      64             : 
      65             :   // Returns a segment from the pool of at least the requested size.
      66             :   Segment* GetSegmentFromPool(size_t requested_size);
      67             :   // Trys to add a segment to the pool. Returns false if the pool is full.
      68             :   bool AddSegmentToPool(Segment* segment);
      69             : 
      70             :   // Empties the pool and puts all its contents onto the garbage stack.
      71             :   void ClearPool();
      72             : 
      73             :   Segment* unused_segments_heads_[kNumberBuckets];
      74             : 
      75             :   size_t unused_segments_sizes_[kNumberBuckets];
      76             :   size_t unused_segments_max_sizes_[kNumberBuckets];
      77             : 
      78             :   base::Mutex unused_segments_mutex_;
      79             : 
      80             :   base::AtomicWord current_memory_usage_ = 0;
      81             :   base::AtomicWord max_memory_usage_ = 0;
      82             :   base::AtomicWord current_pool_size_ = 0;
      83             : 
      84             :   base::AtomicValue<MemoryPressureLevel> memory_pressure_level_;
      85             : 
      86             :   DISALLOW_COPY_AND_ASSIGN(AccountingAllocator);
      87             : };
      88             : 
      89             : }  // namespace internal
      90             : }  // namespace v8
      91             : 
      92             : #endif  // V8_ZONE_ACCOUNTING_ALLOCATOR_H_