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| 1 // Copyright 2015 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 "components/html_viewer/discardable_memory_allocator.h" | |
| 6 | |
| 7 #include <stdint.h> | |
| 8 #include <utility> | |
| 9 | |
| 10 #include "base/macros.h" | |
| 11 #include "base/memory/discardable_memory.h" | |
| 12 #include "base/stl_util.h" | |
| 13 #include "base/trace_event/memory_allocator_dump.h" | |
| 14 #include "base/trace_event/memory_dump_manager.h" | |
| 15 #include "base/trace_event/process_memory_dump.h" | |
| 16 | |
| 17 namespace html_viewer { | |
| 18 | |
| 19 // Interface to the rest of the program. These objects are owned outside of the | |
| 20 // allocator. | |
| 21 class DiscardableMemoryAllocator::DiscardableMemoryChunkImpl | |
| 22 : public base::DiscardableMemory { | |
| 23 public: | |
| 24 DiscardableMemoryChunkImpl(size_t size, DiscardableMemoryAllocator* allocator) | |
| 25 : is_locked_(true), | |
| 26 size_(size), | |
| 27 data_(new uint8_t[size]), | |
| 28 allocator_(allocator) {} | |
| 29 | |
| 30 ~DiscardableMemoryChunkImpl() override { | |
| 31 base::AutoLock lock(allocator_->lock_); | |
| 32 // Either the memory is discarded or the memory chunk is unlocked. | |
| 33 DCHECK(data_ || !is_locked_); | |
| 34 if (!is_locked_ && data_) | |
| 35 allocator_->NotifyDestructed(unlocked_position_); | |
| 36 } | |
| 37 | |
| 38 // Overridden from DiscardableMemoryChunk: | |
| 39 bool Lock() override { | |
| 40 base::AutoLock lock(allocator_->lock_); | |
| 41 DCHECK(!is_locked_); | |
| 42 if (!data_) | |
| 43 return false; | |
| 44 | |
| 45 is_locked_ = true; | |
| 46 allocator_->NotifyLocked(unlocked_position_); | |
| 47 return true; | |
| 48 } | |
| 49 | |
| 50 void Unlock() override { | |
| 51 base::AutoLock lock(allocator_->lock_); | |
| 52 DCHECK(is_locked_); | |
| 53 DCHECK(data_); | |
| 54 is_locked_ = false; | |
| 55 unlocked_position_ = allocator_->NotifyUnlocked(this); | |
| 56 } | |
| 57 | |
| 58 void* data() const override { | |
| 59 if (data_) { | |
| 60 DCHECK(is_locked_); | |
| 61 return data_.get(); | |
| 62 } | |
| 63 return nullptr; | |
| 64 } | |
| 65 | |
| 66 base::trace_event::MemoryAllocatorDump* CreateMemoryAllocatorDump( | |
| 67 const char* name, | |
| 68 base::trace_event::ProcessMemoryDump* pmd) const override { | |
| 69 base::trace_event::MemoryAllocatorDump* dump = | |
| 70 pmd->CreateAllocatorDump(name); | |
| 71 dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize, | |
| 72 base::trace_event::MemoryAllocatorDump::kUnitsBytes, size_); | |
| 73 | |
| 74 // Memory is allocated from system allocator (malloc). | |
| 75 pmd->AddSuballocation(dump->guid(), | |
| 76 base::trace_event::MemoryDumpManager::GetInstance() | |
| 77 ->system_allocator_pool_name()); | |
| 78 return dump; | |
| 79 } | |
| 80 | |
| 81 size_t size() const { return size_; } | |
| 82 | |
| 83 void Discard() { | |
| 84 allocator_->lock_.AssertAcquired(); | |
| 85 DCHECK(!is_locked_); | |
| 86 data_.reset(); | |
| 87 } | |
| 88 | |
| 89 private: | |
| 90 bool is_locked_; | |
| 91 size_t size_; | |
| 92 scoped_ptr<uint8_t[]> data_; | |
| 93 DiscardableMemoryAllocator* allocator_; | |
| 94 | |
| 95 std::list<DiscardableMemoryChunkImpl*>::iterator unlocked_position_; | |
| 96 | |
| 97 DISALLOW_IMPLICIT_CONSTRUCTORS(DiscardableMemoryChunkImpl); | |
| 98 }; | |
| 99 | |
| 100 DiscardableMemoryAllocator::DiscardableMemoryAllocator( | |
| 101 size_t desired_max_memory) | |
| 102 : desired_max_memory_(desired_max_memory), | |
| 103 total_live_memory_(0u), | |
| 104 locked_chunks_(0) { | |
| 105 } | |
| 106 | |
| 107 DiscardableMemoryAllocator::~DiscardableMemoryAllocator() { | |
| 108 DCHECK_EQ(0, locked_chunks_); | |
| 109 STLDeleteElements(&live_unlocked_chunks_); | |
| 110 } | |
| 111 | |
| 112 scoped_ptr<base::DiscardableMemory> | |
| 113 DiscardableMemoryAllocator::AllocateLockedDiscardableMemory(size_t size) { | |
| 114 base::AutoLock lock(lock_); | |
| 115 scoped_ptr<DiscardableMemoryChunkImpl> chunk( | |
| 116 new DiscardableMemoryChunkImpl(size, this)); | |
| 117 total_live_memory_ += size; | |
| 118 locked_chunks_++; | |
| 119 | |
| 120 // Go through the list of unlocked live chunks starting from the least | |
| 121 // recently used, freeing as many as we can until we get our size under the | |
| 122 // desired maximum. | |
| 123 auto it = live_unlocked_chunks_.begin(); | |
| 124 while (total_live_memory_ > desired_max_memory_ && | |
| 125 it != live_unlocked_chunks_.end()) { | |
| 126 total_live_memory_ -= (*it)->size(); | |
| 127 (*it)->Discard(); | |
| 128 it = live_unlocked_chunks_.erase(it); | |
| 129 } | |
| 130 | |
| 131 return std::move(chunk); | |
| 132 } | |
| 133 | |
| 134 std::list<DiscardableMemoryAllocator::DiscardableMemoryChunkImpl*>::iterator | |
| 135 DiscardableMemoryAllocator::NotifyUnlocked(DiscardableMemoryChunkImpl* chunk) { | |
| 136 lock_.AssertAcquired(); | |
| 137 locked_chunks_--; | |
| 138 return live_unlocked_chunks_.insert(live_unlocked_chunks_.end(), chunk); | |
| 139 } | |
| 140 | |
| 141 void DiscardableMemoryAllocator::NotifyLocked( | |
| 142 std::list<DiscardableMemoryChunkImpl*>::iterator it) { | |
| 143 lock_.AssertAcquired(); | |
| 144 locked_chunks_++; | |
| 145 live_unlocked_chunks_.erase(it); | |
| 146 } | |
| 147 | |
| 148 void DiscardableMemoryAllocator::NotifyDestructed( | |
| 149 std::list<DiscardableMemoryChunkImpl*>::iterator it) { | |
| 150 lock_.AssertAcquired(); | |
| 151 live_unlocked_chunks_.erase(it); | |
| 152 } | |
| 153 | |
| 154 } // namespace html_viewer | |
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Chromium Code Reviews
Issue 1677293002:
Bye bye Mandoline (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master