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| 1 /* | |
| 2 * Copyright (C) 2008 Apple Inc. All Rights Reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #include "config.h" | |
| 27 | |
| 28 #if ENABLE(PURGEABLE_MEMORY) | |
| 29 | |
| 30 #include "core/platform/PurgeableBuffer.h" | |
| 31 | |
| 32 #include <mach/mach.h> | |
| 33 #include <wtf/Assertions.h> | |
| 34 #include <wtf/VMTags.h> | |
| 35 | |
| 36 namespace WebCore { | |
| 37 | |
| 38 // Purgeable buffers are allocated in multiples of the page size (4KB in common
CPUs) so | |
| 39 // it does not make sense for very small buffers. Set our minimum size to 16KB. | |
| 40 static const size_t minPurgeableBufferSize = 4 * 4096; | |
| 41 | |
| 42 PurgeableBuffer::PurgeableBuffer(char* data, size_t size) | |
| 43 : m_data(data) | |
| 44 , m_size(size) | |
| 45 , m_purgePriority(PurgeDefault) | |
| 46 , m_state(NonVolatile) | |
| 47 { | |
| 48 } | |
| 49 | |
| 50 PurgeableBuffer::~PurgeableBuffer() | |
| 51 { | |
| 52 vm_deallocate(mach_task_self(), reinterpret_cast<vm_address_t>(m_data), m_si
ze); | |
| 53 } | |
| 54 | |
| 55 PassOwnPtr<PurgeableBuffer> PurgeableBuffer::create(const char* data, size_t siz
e) | |
| 56 { | |
| 57 if (size < minPurgeableBufferSize) | |
| 58 return nullptr; | |
| 59 | |
| 60 vm_address_t buffer = 0; | |
| 61 kern_return_t ret = vm_allocate(mach_task_self(), &buffer, size, VM_FLAGS_PU
RGABLE | VM_FLAGS_ANYWHERE | VM_TAG_FOR_WEBCORE_PURGEABLE_MEMORY); | |
| 62 | |
| 63 ASSERT(ret == KERN_SUCCESS); | |
| 64 if (ret != KERN_SUCCESS) | |
| 65 return nullptr; | |
| 66 | |
| 67 memcpy(reinterpret_cast<char*>(buffer), data, size); | |
| 68 | |
| 69 return adoptPtr(new PurgeableBuffer(reinterpret_cast<char*>(buffer), size)); | |
| 70 } | |
| 71 | |
| 72 bool PurgeableBuffer::makePurgeable(bool purgeable) | |
| 73 { | |
| 74 if (purgeable) { | |
| 75 if (m_state != NonVolatile) | |
| 76 return true; | |
| 77 | |
| 78 int volatileGroup; | |
| 79 if (m_purgePriority == PurgeFirst) | |
| 80 volatileGroup = VM_VOLATILE_GROUP_0; | |
| 81 else if (m_purgePriority == PurgeMiddle) | |
| 82 volatileGroup = VM_VOLATILE_GROUP_4; | |
| 83 else | |
| 84 volatileGroup = VM_VOLATILE_GROUP_7; | |
| 85 | |
| 86 int state = VM_PURGABLE_VOLATILE | volatileGroup; | |
| 87 // So apparently "purgeable" is the correct spelling and the API here is
misspelled. | |
| 88 kern_return_t ret = vm_purgable_control(mach_task_self(), reinterpret_ca
st<vm_address_t>(m_data), VM_PURGABLE_SET_STATE, &state); | |
| 89 | |
| 90 if (ret != KERN_SUCCESS) { | |
| 91 // If that failed we have no clue what state we are in so assume pur
ged. | |
| 92 m_state = Purged; | |
| 93 return true; | |
| 94 } | |
| 95 | |
| 96 m_state = Volatile; | |
| 97 return true; | |
| 98 } | |
| 99 | |
| 100 if (m_state == NonVolatile) | |
| 101 return true; | |
| 102 if (m_state == Purged) | |
| 103 return false; | |
| 104 | |
| 105 int state = VM_PURGABLE_NONVOLATILE; | |
| 106 kern_return_t ret = vm_purgable_control(mach_task_self(), reinterpret_cast<v
m_address_t>(m_data), VM_PURGABLE_SET_STATE, &state); | |
| 107 | |
| 108 if (ret != KERN_SUCCESS) { | |
| 109 // If that failed we have no clue what state we are in so assume purged. | |
| 110 m_state = Purged; | |
| 111 return false; | |
| 112 } | |
| 113 | |
| 114 m_state = state & VM_PURGABLE_EMPTY ? Purged : NonVolatile; | |
| 115 return m_state == NonVolatile; | |
| 116 } | |
| 117 | |
| 118 bool PurgeableBuffer::wasPurged() const | |
| 119 { | |
| 120 if (m_state == NonVolatile) | |
| 121 return false; | |
| 122 if (m_state == Purged) | |
| 123 return true; | |
| 124 | |
| 125 int state; | |
| 126 kern_return_t ret = vm_purgable_control(mach_task_self(), reinterpret_cast<v
m_address_t>(m_data), VM_PURGABLE_GET_STATE, &state); | |
| 127 | |
| 128 if (ret != KERN_SUCCESS) { | |
| 129 // If that failed we have no clue what state we are in so assume purged. | |
| 130 m_state = Purged; | |
| 131 return true; | |
| 132 } | |
| 133 | |
| 134 if (state & VM_PURGABLE_EMPTY) { | |
| 135 m_state = Purged; | |
| 136 return true; | |
| 137 } | |
| 138 | |
| 139 return false; | |
| 140 } | |
| 141 | |
| 142 const char* PurgeableBuffer::data() const | |
| 143 { | |
| 144 ASSERT(m_state == NonVolatile); | |
| 145 return m_data; | |
| 146 } | |
| 147 | |
| 148 } | |
| 149 | |
| 150 #endif | |
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Chromium Code Reviews
Issue 16379004:
Android should be able to discard CachedResources (Closed)
Base URL: svn://svn.chromium.org/blink/trunk