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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
// Copyright (c) 2011 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 "gpu/command_buffer/client/mapped_memory.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <functional>
#include "base/atomic_sequence_num.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/trace_event/memory_dump_manager.h"
#include "base/trace_event/trace_event.h"
#include "gpu/command_buffer/client/cmd_buffer_helper.h"
#include "gpu/command_buffer/client/shared_memory_limits.h"
#include "gpu/command_buffer/common/buffer.h"
namespace gpu {
namespace {
// Generates process-unique IDs to use for tracing a MappedMemoryManager's
// chunks.
base::AtomicSequenceNumber g_next_mapped_memory_manager_tracing_id;
} // namespace
MemoryChunk::MemoryChunk(int32_t shm_id,
scoped_refptr<gpu::Buffer> shm,
CommandBufferHelper* helper)
: shm_id_(shm_id),
shm_(shm),
allocator_(base::checked_cast<unsigned int>(shm->size()),
helper,
shm->memory()) {}
MemoryChunk::~MemoryChunk() = default;
MappedMemoryManager::MappedMemoryManager(CommandBufferHelper* helper,
size_t unused_memory_reclaim_limit)
: chunk_size_multiple_(FencedAllocator::kAllocAlignment),
helper_(helper),
allocated_memory_(0),
max_free_bytes_(unused_memory_reclaim_limit),
max_allocated_bytes_(SharedMemoryLimits::kNoLimit),
tracing_id_(g_next_mapped_memory_manager_tracing_id.GetNext()) {
}
MappedMemoryManager::~MappedMemoryManager() {
helper_->OrderingBarrier();
CommandBuffer* cmd_buf = helper_->command_buffer();
for (auto& chunk : chunks_) {
cmd_buf->DestroyTransferBuffer(chunk->shm_id());
}
}
void* MappedMemoryManager::Alloc(unsigned int size,
int32_t* shm_id,
unsigned int* shm_offset) {
DCHECK(shm_id);
DCHECK(shm_offset);
if (size <= allocated_memory_) {
size_t total_bytes_in_use = 0;
// See if any of the chunks can satisfy this request.
for (auto& chunk : chunks_) {
chunk->FreeUnused();
total_bytes_in_use += chunk->bytes_in_use();
if (chunk->GetLargestFreeSizeWithoutWaiting() >= size) {
void* mem = chunk->Alloc(size);
DCHECK(mem);
*shm_id = chunk->shm_id();
*shm_offset = chunk->GetOffset(mem);
return mem;
}
}
// If there is a memory limit being enforced and total free
// memory (allocated_memory_ - total_bytes_in_use) is larger than
// the limit try waiting.
if (max_free_bytes_ != SharedMemoryLimits::kNoLimit &&
(allocated_memory_ - total_bytes_in_use) >= max_free_bytes_) {
TRACE_EVENT0("gpu", "MappedMemoryManager::Alloc::wait");
for (auto& chunk : chunks_) {
if (chunk->GetLargestFreeSizeWithWaiting() >= size) {
void* mem = chunk->Alloc(size);
DCHECK(mem);
*shm_id = chunk->shm_id();
*shm_offset = chunk->GetOffset(mem);
return mem;
}
}
}
}
if (max_allocated_bytes_ != SharedMemoryLimits::kNoLimit &&
(allocated_memory_ + size) > max_allocated_bytes_) {
return nullptr;
}
// Make a new chunk to satisfy the request.
CommandBuffer* cmd_buf = helper_->command_buffer();
unsigned int chunk_size =
((size + chunk_size_multiple_ - 1) / chunk_size_multiple_) *
chunk_size_multiple_;
int32_t id = -1;
scoped_refptr<gpu::Buffer> shm =
cmd_buf->CreateTransferBuffer(chunk_size, &id);
if (id < 0)
return NULL;
DCHECK(shm.get());
MemoryChunk* mc = new MemoryChunk(id, shm, helper_);
allocated_memory_ += mc->GetSize();
chunks_.push_back(base::WrapUnique(mc));
void* mem = mc->Alloc(size);
DCHECK(mem);
*shm_id = mc->shm_id();
*shm_offset = mc->GetOffset(mem);
return mem;
}
void MappedMemoryManager::Free(void* pointer) {
for (auto& chunk : chunks_) {
if (chunk->IsInChunk(pointer)) {
chunk->Free(pointer);
return;
}
}
NOTREACHED();
}
void MappedMemoryManager::FreePendingToken(void* pointer, int32_t token) {
for (auto& chunk : chunks_) {
if (chunk->IsInChunk(pointer)) {
chunk->FreePendingToken(pointer, token);
return;
}
}
NOTREACHED();
}
void MappedMemoryManager::FreeUnused() {
CommandBuffer* cmd_buf = helper_->command_buffer();
MemoryChunkVector::iterator iter = chunks_.begin();
while (iter != chunks_.end()) {
MemoryChunk* chunk = (*iter).get();
chunk->FreeUnused();
if (chunk->bytes_in_use() == 0u) {
if (chunk->InUseOrFreePending())
helper_->OrderingBarrier();
cmd_buf->DestroyTransferBuffer(chunk->shm_id());
allocated_memory_ -= chunk->GetSize();
iter = chunks_.erase(iter);
} else {
++iter;
}
}
}
bool MappedMemoryManager::OnMemoryDump(
const base::trace_event::MemoryDumpArgs& args,
base::trace_event::ProcessMemoryDump* pmd) {
using base::trace_event::MemoryAllocatorDump;
using base::trace_event::MemoryDumpLevelOfDetail;
if (args.level_of_detail == MemoryDumpLevelOfDetail::BACKGROUND) {
std::string dump_name =
base::StringPrintf("gpu/mapped_memory/manager_%d", tracing_id_);
MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(dump_name);
dump->AddScalar(MemoryAllocatorDump::kNameSize,
MemoryAllocatorDump::kUnitsBytes, allocated_memory_);
// Early out, no need for more detail in a BACKGROUND dump.
return true;
}
const uint64_t tracing_process_id =
base::trace_event::MemoryDumpManager::GetInstance()
->GetTracingProcessId();
for (const auto& chunk : chunks_) {
std::string dump_name = base::StringPrintf(
"gpu/mapped_memory/manager_%d/chunk_%d", tracing_id_, chunk->shm_id());
MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(dump_name);
dump->AddScalar(MemoryAllocatorDump::kNameSize,
MemoryAllocatorDump::kUnitsBytes, chunk->GetSize());
dump->AddScalar("free_size", MemoryAllocatorDump::kUnitsBytes,
chunk->GetFreeSize());
auto shared_memory_guid = chunk->shared_memory()->backing()->GetGUID();
const int kImportance = 2;
if (!shared_memory_guid.is_empty()) {
pmd->CreateSharedMemoryOwnershipEdge(dump->guid(), shared_memory_guid,
kImportance);
} else {
auto guid = GetBufferGUIDForTracing(tracing_process_id, chunk->shm_id());
pmd->CreateSharedGlobalAllocatorDump(guid);
pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
}
}
return true;
}
FencedAllocator::State MappedMemoryManager::GetPointerStatusForTest(
void* pointer,
int32_t* token_if_pending) {
for (auto& chunk : chunks_) {
if (chunk->IsInChunk(pointer)) {
return chunk->GetPointerStatusForTest(pointer, token_if_pending);
}
}
return FencedAllocator::FREE;
}
void ScopedMappedMemoryPtr::Release() {
if (buffer_) {
mapped_memory_manager_->FreePendingToken(buffer_, helper_->InsertToken());
buffer_ = nullptr;
size_ = 0;
shm_id_ = 0;
shm_offset_ = 0;
if (flush_after_release_)
helper_->CommandBufferHelper::Flush();
}
}
void ScopedMappedMemoryPtr::Reset(uint32_t new_size) {
Release();
if (new_size) {
buffer_ = mapped_memory_manager_->Alloc(new_size, &shm_id_, &shm_offset_);
size_ = buffer_ ? new_size : 0;
}
}
} // namespace gpu
|
