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Issue 261993003: base: Use DiscardableMemoryManager on MacOSX. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: fix initial return value of AllocateAndAcquireLock and CHECKs for allocation failure Created 6 years, 7 months ago
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1 // Copyright 2013 The Chromium Authors. All rights reserved. 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 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 #include "base/memory/discardable_memory_emulated.h" 5 #include "base/memory/discardable_memory_emulated.h"
6 6
7 #include "base/lazy_instance.h" 7 #include "base/lazy_instance.h"
8 #include "base/memory/discardable_memory_manager.h" 8 #include "base/memory/discardable_memory_manager.h"
9 9
10 namespace base { 10 namespace base {
11 namespace { 11 namespace {
12 12
13 base::LazyInstance<internal::DiscardableMemoryManager>::Leaky g_manager = 13 // This is admittedly pretty magical. It's approximately enough memory for eight
14 LAZY_INSTANCE_INITIALIZER; 14 // 2560x1600 images.
15 const size_t kEmulatedMemoryLimit = 128 * 1024 * 1024;
16 const size_t kEmulatedBytesToKeepUnderModeratePressure = 12 * 1024 * 1024;
17
18 struct SharedState {
19 SharedState()
20 : manager(kEmulatedMemoryLimit,
21 kEmulatedBytesToKeepUnderModeratePressure) {}
22
23 internal::DiscardableMemoryManager manager;
24 };
25 LazyInstance<SharedState>::Leaky g_shared_state = LAZY_INSTANCE_INITIALIZER;
15 26
16 } // namespace 27 } // namespace
17 28
18 namespace internal { 29 namespace internal {
19 30
20 DiscardableMemoryEmulated::DiscardableMemoryEmulated(size_t bytes) 31 DiscardableMemoryEmulated::DiscardableMemoryEmulated(size_t bytes)
21 : bytes_(bytes), 32 : bytes_(bytes),
22 is_locked_(false) { 33 is_locked_(false) {
23 g_manager.Pointer()->Register(this, bytes); 34 g_shared_state.Pointer()->manager.Register(this, bytes);
24 } 35 }
25 36
26 DiscardableMemoryEmulated::~DiscardableMemoryEmulated() { 37 DiscardableMemoryEmulated::~DiscardableMemoryEmulated() {
27 if (is_locked_) 38 if (is_locked_)
28 Unlock(); 39 Unlock();
29 g_manager.Pointer()->Unregister(this); 40 g_shared_state.Pointer()->manager.Unregister(this);
30 } 41 }
31 42
32 // static 43 // static
33 void DiscardableMemoryEmulated::RegisterMemoryPressureListeners() { 44 void DiscardableMemoryEmulated::RegisterMemoryPressureListeners() {
34 g_manager.Pointer()->RegisterMemoryPressureListener(); 45 g_shared_state.Pointer()->manager.RegisterMemoryPressureListener();
35 } 46 }
36 47
37 // static 48 // static
38 void DiscardableMemoryEmulated::UnregisterMemoryPressureListeners() { 49 void DiscardableMemoryEmulated::UnregisterMemoryPressureListeners() {
39 g_manager.Pointer()->UnregisterMemoryPressureListener(); 50 g_shared_state.Pointer()->manager.UnregisterMemoryPressureListener();
40 } 51 }
41 52
42 // static 53 // static
43 void DiscardableMemoryEmulated::PurgeForTesting() { 54 void DiscardableMemoryEmulated::PurgeForTesting() {
44 g_manager.Pointer()->PurgeAll(); 55 g_shared_state.Pointer()->manager.PurgeAll();
45 } 56 }
46 57
47 bool DiscardableMemoryEmulated::Initialize() { 58 bool DiscardableMemoryEmulated::Initialize() {
48 return Lock() == DISCARDABLE_MEMORY_LOCK_STATUS_PURGED; 59 return Lock() == DISCARDABLE_MEMORY_LOCK_STATUS_PURGED;
49 } 60 }
50 61
51 DiscardableMemoryLockStatus DiscardableMemoryEmulated::Lock() { 62 DiscardableMemoryLockStatus DiscardableMemoryEmulated::Lock() {
52 DCHECK(!is_locked_); 63 DCHECK(!is_locked_);
53 64
54 bool purged = false; 65 bool purged = false;
55 if (!g_manager.Pointer()->AcquireLock(this, &purged)) 66 if (!g_shared_state.Pointer()->manager.AcquireLock(this, &purged))
56 return DISCARDABLE_MEMORY_LOCK_STATUS_FAILED; 67 return DISCARDABLE_MEMORY_LOCK_STATUS_FAILED;
57 68
58 is_locked_ = true; 69 is_locked_ = true;
59 return purged ? DISCARDABLE_MEMORY_LOCK_STATUS_PURGED 70 return purged ? DISCARDABLE_MEMORY_LOCK_STATUS_PURGED
60 : DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS; 71 : DISCARDABLE_MEMORY_LOCK_STATUS_SUCCESS;
61 } 72 }
62 73
63 void DiscardableMemoryEmulated::Unlock() { 74 void DiscardableMemoryEmulated::Unlock() {
64 DCHECK(is_locked_); 75 DCHECK(is_locked_);
65 g_manager.Pointer()->ReleaseLock(this); 76 g_shared_state.Pointer()->manager.ReleaseLock(this);
66 is_locked_ = false; 77 is_locked_ = false;
67 } 78 }
68 79
69 void* DiscardableMemoryEmulated::Memory() const { 80 void* DiscardableMemoryEmulated::Memory() const {
70 DCHECK(is_locked_); 81 DCHECK(is_locked_);
71 DCHECK(memory_); 82 DCHECK(memory_);
72 return memory_.get(); 83 return memory_.get();
73 } 84 }
74 85
75 bool DiscardableMemoryEmulated::AllocateAndAcquireLock() { 86 bool DiscardableMemoryEmulated::AllocateAndAcquireLock() {
76 if (memory_) 87 if (memory_)
77 return true; 88 return true;
78 89
79 memory_.reset(new uint8[bytes_]); 90 memory_.reset(new uint8[bytes_]);
80 return false; 91 return false;
81 } 92 }
82 93
83 void DiscardableMemoryEmulated::Purge() { 94 void DiscardableMemoryEmulated::Purge() {
84 memory_.reset(); 95 memory_.reset();
85 } 96 }
86 97
87 } // namespace internal 98 } // namespace internal
88 } // namespace base 99 } // namespace base
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