1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/memory/discardable_memory.h"
#include "base/android/sys_utils.h"
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/discardable_memory_ashmem.h"
#include "base/memory/discardable_memory_ashmem_allocator.h"
#include "base/memory/discardable_memory_emulated.h"
#include "base/memory/discardable_memory_malloc.h"
namespace base {
namespace {
const char kAshmemAllocatorName[] = "DiscardableMemoryAshmemAllocator";
// For Ashmem, have the DiscardableMemoryManager trigger userspace eviction
// when address space usage gets too high (e.g. 512 MBytes).
const size_t kAshmemMemoryLimit = 512 * 1024 * 1024;
size_t GetOptimalAshmemRegionSizeForAllocator() {
// Note that this may do some I/O (without hitting the disk though) so it
// should not be called on the critical path.
return base::android::SysUtils::AmountOfPhysicalMemoryKB() * 1024 / 8;
}
// Holds the shared state used for allocations.
struct SharedState {
SharedState()
: manager(kAshmemMemoryLimit,
kAshmemMemoryLimit,
kAshmemMemoryLimit,
TimeDelta::Max()),
allocator(kAshmemAllocatorName,
GetOptimalAshmemRegionSizeForAllocator()) {}
internal::DiscardableMemoryManager manager;
internal::DiscardableMemoryAshmemAllocator allocator;
};
LazyInstance<SharedState>::Leaky g_shared_state = LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
void DiscardableMemory::RegisterMemoryPressureListeners() {
internal::DiscardableMemoryEmulated::RegisterMemoryPressureListeners();
}
// static
void DiscardableMemory::UnregisterMemoryPressureListeners() {
internal::DiscardableMemoryEmulated::UnregisterMemoryPressureListeners();
}
// static
bool DiscardableMemory::ReduceMemoryUsage() {
return internal::DiscardableMemoryEmulated::ReduceMemoryUsage();
}
// static
void DiscardableMemory::GetSupportedTypes(
std::vector<DiscardableMemoryType>* types) {
const DiscardableMemoryType supported_types[] = {
DISCARDABLE_MEMORY_TYPE_ASHMEM,
DISCARDABLE_MEMORY_TYPE_EMULATED,
DISCARDABLE_MEMORY_TYPE_MALLOC
};
types->assign(supported_types, supported_types + arraysize(supported_types));
}
// static
scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemoryWithType(
DiscardableMemoryType type, size_t size) {
switch (type) {
case DISCARDABLE_MEMORY_TYPE_NONE:
case DISCARDABLE_MEMORY_TYPE_MAC:
return scoped_ptr<DiscardableMemory>();
case DISCARDABLE_MEMORY_TYPE_ASHMEM: {
SharedState* const shared_state = g_shared_state.Pointer();
scoped_ptr<internal::DiscardableMemoryAshmem> memory(
new internal::DiscardableMemoryAshmem(
size, &shared_state->allocator, &shared_state->manager));
if (!memory->Initialize())
return scoped_ptr<DiscardableMemory>();
return memory.PassAs<DiscardableMemory>();
}
case DISCARDABLE_MEMORY_TYPE_EMULATED: {
scoped_ptr<internal::DiscardableMemoryEmulated> memory(
new internal::DiscardableMemoryEmulated(size));
if (!memory->Initialize())
return scoped_ptr<DiscardableMemory>();
return memory.PassAs<DiscardableMemory>();
}
case DISCARDABLE_MEMORY_TYPE_MALLOC: {
scoped_ptr<internal::DiscardableMemoryMalloc> memory(
new internal::DiscardableMemoryMalloc(size));
if (!memory->Initialize())
return scoped_ptr<DiscardableMemory>();
return memory.PassAs<DiscardableMemory>();
}
}
NOTREACHED();
return scoped_ptr<DiscardableMemory>();
}
// static
void DiscardableMemory::PurgeForTesting() {
g_shared_state.Pointer()->manager.PurgeAll();
internal::DiscardableMemoryEmulated::PurgeForTesting();
}
} // namespace base
|
