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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium 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 BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_ | 5 #ifndef BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_ |
6 #define BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_ | 6 #define BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_ |
7 | 7 |
8 #include "base/base_export.h" | 8 #include "base/base_export.h" |
9 #include "base/containers/hash_tables.h" | 9 #include "base/containers/hash_tables.h" |
10 #include "base/containers/mru_cache.h" | 10 #include "base/containers/mru_cache.h" |
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60 // amount of allocated memory (in case this forces a purge). When memory usage | 60 // amount of allocated memory (in case this forces a purge). When memory usage |
61 // reaches the limit, the manager purges the LRU memory. | 61 // reaches the limit, the manager purges the LRU memory. |
62 // | 62 // |
63 // When notified of memory pressure, the manager either purges the LRU memory -- | 63 // When notified of memory pressure, the manager either purges the LRU memory -- |
64 // if the pressure is moderate -- or all discardable memory if the pressure is | 64 // if the pressure is moderate -- or all discardable memory if the pressure is |
65 // critical. | 65 // critical. |
66 class BASE_EXPORT_PRIVATE DiscardableMemoryManager { | 66 class BASE_EXPORT_PRIVATE DiscardableMemoryManager { |
67 public: | 67 public: |
68 typedef DiscardableMemoryManagerAllocation Allocation; | 68 typedef DiscardableMemoryManagerAllocation Allocation; |
69 | 69 |
70 DiscardableMemoryManager(); | 70 DiscardableMemoryManager(size_t memory_limit, |
| 71 size_t bytes_to_keep_under_moderate_pressure); |
71 ~DiscardableMemoryManager(); | 72 ~DiscardableMemoryManager(); |
72 | 73 |
73 // Call this to register memory pressure listener. Must be called on a thread | 74 // Call this to register memory pressure listener. Must be called on a thread |
74 // with a MessageLoop current. | 75 // with a MessageLoop current. |
75 void RegisterMemoryPressureListener(); | 76 void RegisterMemoryPressureListener(); |
76 | 77 |
77 // Call this to unregister memory pressure listener. | 78 // Call this to unregister memory pressure listener. |
78 void UnregisterMemoryPressureListener(); | 79 void UnregisterMemoryPressureListener(); |
79 | 80 |
80 // The maximum number of bytes of memory that may be allocated before we force | 81 // The maximum number of bytes of memory that may be allocated before we force |
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163 // pressure. | 164 // pressure. |
164 scoped_ptr<MemoryPressureListener> memory_pressure_listener_; | 165 scoped_ptr<MemoryPressureListener> memory_pressure_listener_; |
165 | 166 |
166 DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryManager); | 167 DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryManager); |
167 }; | 168 }; |
168 | 169 |
169 } // namespace internal | 170 } // namespace internal |
170 } // namespace base | 171 } // namespace base |
171 | 172 |
172 #endif // BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_ | 173 #endif // BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_ |
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