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| 1 // Copyright 2013 The Chromium 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 #include "base/memory/discardable_memory_emulated.h" | |
| 6 | |
| 7 #include "base/lazy_instance.h" | |
| 8 #include "base/memory/discardable_memory_manager.h" | |
| 9 | |
| 10 namespace base { | |
| 11 namespace { | |
| 12 | |
| 13 // This is admittedly pretty magical. | |
| 14 const size_t kEmulatedMemoryLimit = 512 * 1024 * 1024; | |
| 15 const size_t kEmulatedSoftMemoryLimit = 32 * 1024 * 1024; | |
| 16 const size_t kEmulatedHardMemoryLimitExpirationTimeMs = 1000; | |
| 17 | |
| 18 // internal::DiscardableMemoryManager has an explicit constructor that takes | |
| 19 // a number of memory limit parameters. The LeakyLazyInstanceTraits doesn't | |
| 20 // handle the case. Thus, we need our own class here. | |
| 21 struct DiscardableMemoryManagerLazyInstanceTraits { | |
| 22 // Leaky as discardable memory clients can use this after the exit handler | |
| 23 // has been called. | |
| 24 static const bool kRegisterOnExit = false; | |
| 25 #ifndef NDEBUG | |
| 26 static const bool kAllowedToAccessOnNonjoinableThread = true; | |
| 27 #endif | |
| 28 | |
| 29 static internal::DiscardableMemoryManager* New(void* instance) { | |
| 30 return new (instance) internal::DiscardableMemoryManager( | |
| 31 kEmulatedMemoryLimit, | |
| 32 kEmulatedSoftMemoryLimit, | |
| 33 TimeDelta::FromMilliseconds(kEmulatedHardMemoryLimitExpirationTimeMs)); | |
| 34 } | |
| 35 static void Delete(internal::DiscardableMemoryManager* instance) { | |
| 36 instance->~DiscardableMemoryManager(); | |
| 37 } | |
| 38 }; | |
| 39 | |
| 40 LazyInstance<internal::DiscardableMemoryManager, | |
| 41 DiscardableMemoryManagerLazyInstanceTraits> | |
| 42 g_manager = LAZY_INSTANCE_INITIALIZER; | |
| 43 | |
| 44 } // namespace | |
| 45 | |
| 46 namespace internal { | |
| 47 | |
| 48 DiscardableMemoryEmulated::DiscardableMemoryEmulated(size_t bytes) | |
| 49 : bytes_(bytes), | |
| 50 is_locked_(false) { | |
| 51 g_manager.Pointer()->Register(this, bytes); | |
| 52 } | |
| 53 | |
| 54 DiscardableMemoryEmulated::~DiscardableMemoryEmulated() { | |
| 55 if (is_locked_) | |
| 56 Unlock(); | |
| 57 g_manager.Pointer()->Unregister(this); | |
| 58 } | |
| 59 | |
| 60 // static | |
| 61 bool DiscardableMemoryEmulated::ReduceMemoryUsage() { | |
| 62 return g_manager.Pointer()->ReduceMemoryUsage(); | |
| 63 } | |
| 64 | |
| 65 // static | |
| 66 void DiscardableMemoryEmulated::ReduceMemoryUsageUntilWithinLimit( | |
| 67 size_t bytes) { | |
| 68 g_manager.Pointer()->ReduceMemoryUsageUntilWithinLimit(bytes); | |
| 69 } | |
| 70 | |
| 71 bool DiscardableMemoryEmulated::Initialize() { | |
| 72 return Lock() != DISCARDABLE_MEMORY_LOCK_STATUS_FAILED; | |
| 73 } | |
| 74 | |
| 75 DiscardableMemoryLockStatus DiscardableMemoryEmulated::Lock() { | |
| 76 DCHECK(!is_locked_); | |
| 77 | |
| 78 bool purged = false; | |
| 79 if (!g_manager.Pointer()->AcquireLock(this, &purged)) | |
| 80 return DISCARDABLE_MEMORY_LOCK_STATUS_FAILED; | |
| 81 | |
| 82 is_locked_ = true; | |
| 83 return purged ? DISCARDABLE_MEMORY_LOCK_STATUS_PURGED | |
| 84 : DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS; | |
| 85 } | |
| 86 | |
| 87 void DiscardableMemoryEmulated::Unlock() { | |
| 88 DCHECK(is_locked_); | |
| 89 g_manager.Pointer()->ReleaseLock(this); | |
| 90 is_locked_ = false; | |
| 91 } | |
| 92 | |
| 93 void* DiscardableMemoryEmulated::Memory() const { | |
| 94 DCHECK(is_locked_); | |
| 95 DCHECK(memory_); | |
| 96 return memory_.get(); | |
| 97 } | |
| 98 | |
| 99 bool DiscardableMemoryEmulated::AllocateAndAcquireLock() { | |
| 100 if (memory_) | |
| 101 return true; | |
| 102 | |
| 103 memory_.reset(new uint8[bytes_]); | |
| 104 return false; | |
| 105 } | |
| 106 | |
| 107 void DiscardableMemoryEmulated::Purge() { | |
| 108 memory_.reset(); | |
| 109 } | |
| 110 | |
| 111 } // namespace internal | |
| 112 } // namespace base | |
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Chromium Code Reviews
Issue 1001833005:
Update from https://crrev.com/320343 (Closed)
Base URL: git@github.com:domokit/mojo.git@master