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1 // Copyright 2016 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_ZONE_ACCOUNTING_ALLOCATOR_H_ | 5 #ifndef V8_ZONE_ACCOUNTING_ALLOCATOR_H_ |
6 #define V8_ZONE_ACCOUNTING_ALLOCATOR_H_ | 6 #define V8_ZONE_ACCOUNTING_ALLOCATOR_H_ |
7 | 7 |
8 #include "include/v8-platform.h" | 8 #include "include/v8-platform.h" |
9 #include "src/base/atomic-utils.h" | 9 #include "src/base/atomic-utils.h" |
10 #include "src/base/atomicops.h" | 10 #include "src/base/atomicops.h" |
11 #include "src/base/macros.h" | 11 #include "src/base/macros.h" |
12 #include "src/base/platform/mutex.h" | 12 #include "src/base/platform/mutex.h" |
13 #include "src/base/platform/semaphore.h" | 13 #include "src/base/platform/semaphore.h" |
14 #include "src/base/platform/time.h" | 14 #include "src/base/platform/time.h" |
15 #include "src/zone/zone-segment.h" | 15 #include "src/zone/zone-segment.h" |
16 | 16 |
17 namespace v8 { | 17 namespace v8 { |
18 namespace internal { | 18 namespace internal { |
19 | 19 |
20 class V8_EXPORT_PRIVATE AccountingAllocator { | 20 class V8_EXPORT_PRIVATE AccountingAllocator { |
21 public: | 21 public: |
22 AccountingAllocator(); | 22 AccountingAllocator() = default; |
23 virtual ~AccountingAllocator(); | 23 virtual ~AccountingAllocator() = default; |
24 | 24 |
25 // Gets an empty segment from the pool or creates a new one. | 25 virtual Segment* AllocateSegment(size_t bytes); |
26 virtual Segment* GetSegment(size_t bytes); | 26 virtual void FreeSegment(Segment* memory); |
27 // Return unneeded segments to either insert them into the pool or release | |
28 // them if the pool is already full or memory pressure is high. | |
29 virtual void ReturnSegment(Segment* memory); | |
30 | 27 |
31 size_t GetCurrentMemoryUsage() const; | 28 size_t GetCurrentMemoryUsage() const; |
32 size_t GetMaxMemoryUsage() const; | 29 size_t GetMaxMemoryUsage() const; |
33 | 30 |
34 size_t GetCurrentPoolSize() const; | |
35 | |
36 void MemoryPressureNotification(MemoryPressureLevel level); | |
37 | |
38 private: | 31 private: |
39 static const uint8_t kMinSegmentSizePower = 13; | |
40 static const uint8_t kMaxSegmentSizePower = 18; | |
41 static const uint8_t kMaxSegmentsPerBucket = 5; | |
42 | |
43 STATIC_ASSERT(kMinSegmentSizePower <= kMaxSegmentSizePower); | |
44 | |
45 // Allocates a new segment. Returns nullptr on failed allocation. | |
46 Segment* AllocateSegment(size_t bytes); | |
47 void FreeSegment(Segment* memory); | |
48 | |
49 // Returns a segment from the pool of at least the requested size. | |
50 Segment* GetSegmentFromPool(size_t requested_size); | |
51 // Trys to add a segment to the pool. Returns false if the pool is full. | |
52 bool AddSegmentToPool(Segment* segment); | |
53 | |
54 // Empties the pool and puts all its contents onto the garbage stack. | |
55 void ClearPool(); | |
56 | |
57 Segment* | |
58 unused_segments_heads_[1 + kMaxSegmentSizePower - kMinSegmentSizePower]; | |
59 | |
60 size_t unused_segments_sizes[1 + kMaxSegmentSizePower - kMinSegmentSizePower]; | |
61 | |
62 size_t unused_segments_size_ = 0; | |
63 | |
64 base::Mutex unused_segments_mutex_; | |
65 | |
66 base::AtomicWord current_memory_usage_ = 0; | 32 base::AtomicWord current_memory_usage_ = 0; |
67 base::AtomicWord max_memory_usage_ = 0; | 33 base::AtomicWord max_memory_usage_ = 0; |
68 | 34 |
69 base::AtomicValue<MemoryPressureLevel> memory_pressure_level_; | |
70 | |
71 DISALLOW_COPY_AND_ASSIGN(AccountingAllocator); | 35 DISALLOW_COPY_AND_ASSIGN(AccountingAllocator); |
72 }; | 36 }; |
73 | 37 |
74 } // namespace internal | 38 } // namespace internal |
75 } // namespace v8 | 39 } // namespace v8 |
76 | 40 |
77 #endif // V8_ZONE_ACCOUNTING_ALLOCATOR_H_ | 41 #endif // V8_ZONE_ACCOUNTING_ALLOCATOR_H_ |
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