cc/raster/one_copy_tile_task_worker_pool.cc

   1 // Copyright 2014 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 "cc/raster/one_copy_tile_task_worker_pool.h"
   6
   7 #include <algorithm>
   8 #include <limits>
   9
  10 #include "base/strings/stringprintf.h"
  11 #include "base/trace_event/trace_event.h"
  12 #include "base/trace_event/trace_event_argument.h"
  13 #include "cc/base/math_util.h"
  14 #include "cc/debug/traced_value.h"
  15 #include "cc/raster/raster_buffer.h"
  16 #include "cc/resources/platform_color.h"
  17 #include "cc/resources/resource_pool.h"
  18 #include "cc/resources/scoped_resource.h"
  19 #include "gpu/command_buffer/client/gles2_interface.h"
  20 #include "ui/gfx/gpu_memory_buffer.h"
  21
  22 namespace cc {
  23 namespace {
  24
  25 class RasterBufferImpl : public RasterBuffer {
  26  public:
  27   RasterBufferImpl(OneCopyTileTaskWorkerPool* worker_pool,
  28                    ResourceProvider* resource_provider,
  29                    ResourcePool* resource_pool,
  30                    ResourceFormat resource_format,
  31                    const Resource* output_resource,
  32                    uint64_t previous_content_id)
  33       : worker_pool_(worker_pool),
  34         resource_provider_(resource_provider),
  35         resource_pool_(resource_pool),
  36         output_resource_(output_resource),
  37         raster_content_id_(0),
  38         sequence_(0) {
  39     if (worker_pool->have_persistent_gpu_memory_buffers() &&
  40         previous_content_id) {
  41       raster_resource_ =
  42           resource_pool->TryAcquireResourceWithContentId(previous_content_id);
  43     }
  44     if (raster_resource_) {
  45       raster_content_id_ = previous_content_id;
  46       DCHECK_EQ(resource_format, raster_resource_->format());
  47       DCHECK_EQ(output_resource->size().ToString(),
  48                 raster_resource_->size().ToString());
  49     } else {
  50       raster_resource_ = resource_pool->AcquireResource(output_resource->size(),
  51                                                         resource_format);
  52     }
  53
  54     lock_.reset(new ResourceProvider::ScopedWriteLockGpuMemoryBuffer(
  55         resource_provider_, raster_resource_->id()));
  56   }
  57
  58   ~RasterBufferImpl() override {
  59     // Release write lock in case a copy was never scheduled.
  60     lock_.reset();
  61
  62     // Make sure any scheduled copy operations are issued before we release the
  63     // raster resource.
  64     if (sequence_)
  65       worker_pool_->AdvanceLastIssuedCopyTo(sequence_);
  66
  67     // Return resources to pool so they can be used by another RasterBuffer
  68     // instance.
  69     resource_pool_->ReleaseResource(raster_resource_.Pass(),
  70                                     raster_content_id_);
  71   }
  72
  73   // Overridden from RasterBuffer:
  74   void Playback(const RasterSource* raster_source,
  75                 const gfx::Rect& raster_full_rect,
  76                 const gfx::Rect& raster_dirty_rect,
  77                 uint64_t new_content_id,
  78                 float scale) override {
  79     // If there's a raster_content_id_, we are reusing a resource with that
  80     // content id.
  81     bool reusing_raster_resource = raster_content_id_ != 0;
  82     sequence_ = worker_pool_->PlaybackAndScheduleCopyOnWorkerThread(
  83         reusing_raster_resource, lock_.Pass(), raster_resource_.get(),
  84         output_resource_, raster_source, raster_full_rect, raster_dirty_rect,
  85         scale);
  86     // Store the content id of the resource to return to the pool.
  87     raster_content_id_ = new_content_id;
  88   }
  89
  90  private:
  91   OneCopyTileTaskWorkerPool* worker_pool_;
  92   ResourceProvider* resource_provider_;
  93   ResourcePool* resource_pool_;
  94   const Resource* output_resource_;
  95   uint64_t raster_content_id_;
  96   scoped_ptr<ScopedResource> raster_resource_;
  97   scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> lock_;
  98   CopySequenceNumber sequence_;
  99
 100   DISALLOW_COPY_AND_ASSIGN(RasterBufferImpl);
 101 };
 102
 103 // Number of in-flight copy operations to allow.
 104 const int kMaxCopyOperations = 32;
 105
 106 // Delay been checking for copy operations to complete.
 107 const int kCheckForCompletedCopyOperationsTickRateMs = 1;
 108
 109 // Number of failed attempts to allow before we perform a check that will
 110 // wait for copy operations to complete if needed.
 111 const int kFailedAttemptsBeforeWaitIfNeeded = 256;
 112
 113 // 4MiB is the size of 4 512x512 tiles, which has proven to be a good
 114 // default batch size for copy operations.
 115 const int kMaxBytesPerCopyOperation = 1024 * 1024 * 4;
 116
 117 }  // namespace
 118
 119 OneCopyTileTaskWorkerPool::CopyOperation::CopyOperation(
 120     scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> src_write_lock,
 121     const Resource* src,
 122     const Resource* dst,
 123     const gfx::Rect& rect)
 124     : src_write_lock(src_write_lock.Pass()), src(src), dst(dst), rect(rect) {
 125 }
 126
 127 OneCopyTileTaskWorkerPool::CopyOperation::~CopyOperation() {
 128 }
 129
 130 // static
 131 scoped_ptr<TileTaskWorkerPool> OneCopyTileTaskWorkerPool::Create(
 132     base::SequencedTaskRunner* task_runner,
 133     TaskGraphRunner* task_graph_runner,
 134     ContextProvider* context_provider,
 135     ResourceProvider* resource_provider,
 136     ResourcePool* resource_pool,
 137     int max_copy_texture_chromium_size,
 138     bool have_persistent_gpu_memory_buffers) {
 139   return make_scoped_ptr<TileTaskWorkerPool>(new OneCopyTileTaskWorkerPool(
 140       task_runner, task_graph_runner, context_provider, resource_provider,
 141       resource_pool, max_copy_texture_chromium_size,
 142       have_persistent_gpu_memory_buffers));
 143 }
 144
 145 OneCopyTileTaskWorkerPool::OneCopyTileTaskWorkerPool(
 146     base::SequencedTaskRunner* task_runner,
 147     TaskGraphRunner* task_graph_runner,
 148     ContextProvider* context_provider,
 149     ResourceProvider* resource_provider,
 150     ResourcePool* resource_pool,
 151     int max_copy_texture_chromium_size,
 152     bool have_persistent_gpu_memory_buffers)
 153     : task_runner_(task_runner),
 154       task_graph_runner_(task_graph_runner),
 155       namespace_token_(task_graph_runner->GetNamespaceToken()),
 156       context_provider_(context_provider),
 157       resource_provider_(resource_provider),
 158       resource_pool_(resource_pool),
 159       max_bytes_per_copy_operation_(
 160           max_copy_texture_chromium_size
 161               ? std::min(kMaxBytesPerCopyOperation,
 162                          max_copy_texture_chromium_size)
 163               : kMaxBytesPerCopyOperation),
 164       have_persistent_gpu_memory_buffers_(have_persistent_gpu_memory_buffers),
 165       last_issued_copy_operation_(0),
 166       last_flushed_copy_operation_(0),
 167       lock_(),
 168       copy_operation_count_cv_(&lock_),
 169       bytes_scheduled_since_last_flush_(0),
 170       issued_copy_operation_count_(0),
 171       next_copy_operation_sequence_(1),
 172       check_for_completed_copy_operations_pending_(false),
 173       shutdown_(false),
 174       weak_ptr_factory_(this),
 175       task_set_finished_weak_ptr_factory_(this) {
 176   DCHECK(context_provider_);
 177 }
 178
 179 OneCopyTileTaskWorkerPool::~OneCopyTileTaskWorkerPool() {
 180   DCHECK_EQ(pending_copy_operations_.size(), 0u);
 181 }
 182
 183 TileTaskRunner* OneCopyTileTaskWorkerPool::AsTileTaskRunner() {
 184   return this;
 185 }
 186
 187 void OneCopyTileTaskWorkerPool::SetClient(TileTaskRunnerClient* client) {
 188   client_ = client;
 189 }
 190
 191 void OneCopyTileTaskWorkerPool::Shutdown() {
 192   TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::Shutdown");
 193
 194   {
 195     base::AutoLock lock(lock_);
 196
 197     shutdown_ = true;
 198     copy_operation_count_cv_.Signal();
 199   }
 200
 201   TaskGraph empty;
 202   task_graph_runner_->ScheduleTasks(namespace_token_, &empty);
 203   task_graph_runner_->WaitForTasksToFinishRunning(namespace_token_);
 204 }
 205
 206 void OneCopyTileTaskWorkerPool::ScheduleTasks(TileTaskQueue* queue) {
 207   TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::ScheduleTasks");
 208
 209 #if DCHECK_IS_ON()
 210   {
 211     base::AutoLock lock(lock_);
 212     DCHECK(!shutdown_);
 213   }
 214 #endif
 215
 216   if (tasks_pending_.none())
 217     TRACE_EVENT_ASYNC_BEGIN0("cc", "ScheduledTasks", this);
 218
 219   // Mark all task sets as pending.
 220   tasks_pending_.set();
 221
 222   size_t priority = kTileTaskPriorityBase;
 223
 224   graph_.Reset();
 225
 226   // Cancel existing OnTaskSetFinished callbacks.
 227   task_set_finished_weak_ptr_factory_.InvalidateWeakPtrs();
 228
 229   scoped_refptr<TileTask> new_task_set_finished_tasks[kNumberOfTaskSets];
 230
 231   size_t task_count[kNumberOfTaskSets] = {0};
 232
 233   for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set) {
 234     new_task_set_finished_tasks[task_set] = CreateTaskSetFinishedTask(
 235         task_runner_.get(),
 236         base::Bind(&OneCopyTileTaskWorkerPool::OnTaskSetFinished,
 237                    task_set_finished_weak_ptr_factory_.GetWeakPtr(), task_set));
 238   }
 239
 240   resource_pool_->CheckBusyResources(false);
 241
 242   for (TileTaskQueue::Item::Vector::const_iterator it = queue->items.begin();
 243        it != queue->items.end(); ++it) {
 244     const TileTaskQueue::Item& item = *it;
 245     RasterTask* task = item.task;
 246     DCHECK(!task->HasCompleted());
 247
 248     for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set) {
 249       if (!item.task_sets[task_set])
 250         continue;
 251
 252       ++task_count[task_set];
 253
 254       graph_.edges.push_back(
 255           TaskGraph::Edge(task, new_task_set_finished_tasks[task_set].get()));
 256     }
 257
 258     InsertNodesForRasterTask(&graph_, task, task->dependencies(), priority++);
 259   }
 260
 261   for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set) {
 262     InsertNodeForTask(&graph_, new_task_set_finished_tasks[task_set].get(),
 263                       kTaskSetFinishedTaskPriorityBase + task_set,
 264                       task_count[task_set]);
 265   }
 266
 267   ScheduleTasksOnOriginThread(this, &graph_);
 268   task_graph_runner_->ScheduleTasks(namespace_token_, &graph_);
 269
 270   std::copy(new_task_set_finished_tasks,
 271             new_task_set_finished_tasks + kNumberOfTaskSets,
 272             task_set_finished_tasks_);
 273
 274   resource_pool_->ReduceResourceUsage();
 275
 276   TRACE_EVENT_ASYNC_STEP_INTO1("cc", "ScheduledTasks", this, "running", "state",
 277                                StateAsValue());
 278 }
 279
 280 void OneCopyTileTaskWorkerPool::CheckForCompletedTasks() {
 281   TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::CheckForCompletedTasks");
 282
 283   task_graph_runner_->CollectCompletedTasks(namespace_token_,
 284                                             &completed_tasks_);
 285
 286   for (Task::Vector::const_iterator it = completed_tasks_.begin();
 287        it != completed_tasks_.end(); ++it) {
 288     TileTask* task = static_cast<TileTask*>(it->get());
 289
 290     task->WillComplete();
 291     task->CompleteOnOriginThread(this);
 292     task->DidComplete();
 293
 294     task->RunReplyOnOriginThread();
 295   }
 296   completed_tasks_.clear();
 297 }
 298
 299 ResourceFormat OneCopyTileTaskWorkerPool::GetResourceFormat() const {
 300   return resource_provider_->best_texture_format();
 301 }
 302
 303 bool OneCopyTileTaskWorkerPool::GetResourceRequiresSwizzle() const {
 304   return !PlatformColor::SameComponentOrder(GetResourceFormat());
 305 }
 306
 307 scoped_ptr<RasterBuffer> OneCopyTileTaskWorkerPool::AcquireBufferForRaster(
 308     const Resource* resource,
 309     uint64_t resource_content_id,
 310     uint64_t previous_content_id) {
 311   // TODO(danakj): If resource_content_id != 0, we only need to copy/upload
 312   // the dirty rect.
 313   DCHECK_EQ(resource->format(), resource_provider_->best_texture_format());
 314   return make_scoped_ptr<RasterBuffer>(
 315       new RasterBufferImpl(this, resource_provider_, resource_pool_,
 316                            resource_provider_->best_texture_format(), resource,
 317                            previous_content_id));
 318 }
 319
 320 void OneCopyTileTaskWorkerPool::ReleaseBufferForRaster(
 321     scoped_ptr<RasterBuffer> buffer) {
 322   // Nothing to do here. RasterBufferImpl destructor cleans up after itself.
 323 }
 324
 325 CopySequenceNumber
 326 OneCopyTileTaskWorkerPool::PlaybackAndScheduleCopyOnWorkerThread(
 327     bool reusing_raster_resource,
 328     scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer>
 329         raster_resource_write_lock,
 330     const Resource* raster_resource,
 331     const Resource* output_resource,
 332     const RasterSource* raster_source,
 333     const gfx::Rect& raster_full_rect,
 334     const gfx::Rect& raster_dirty_rect,
 335     float scale) {
 336   gfx::GpuMemoryBuffer* gpu_memory_buffer =
 337       raster_resource_write_lock->GetGpuMemoryBuffer();
 338   if (gpu_memory_buffer) {
 339     void* data = NULL;
 340     bool rv = gpu_memory_buffer->Map(&data);
 341     DCHECK(rv);
 342     int stride;
 343     gpu_memory_buffer->GetStride(&stride);
 344     // TileTaskWorkerPool::PlaybackToMemory only supports unsigned strides.
 345     DCHECK_GE(stride, 0);
 346
 347     gfx::Rect playback_rect = raster_full_rect;
 348     if (reusing_raster_resource) {
 349       playback_rect.Intersect(raster_dirty_rect);
 350     }
 351     DCHECK(!playback_rect.IsEmpty())
 352         << "Why are we rastering a tile that's not dirty?";
 353     TileTaskWorkerPool::PlaybackToMemory(
 354         data, raster_resource->format(), raster_resource->size(),
 355         static_cast<size_t>(stride), raster_source, raster_full_rect,
 356         playback_rect, scale);
 357     gpu_memory_buffer->Unmap();
 358   }
 359
 360   base::AutoLock lock(lock_);
 361
 362   CopySequenceNumber sequence = 0;
 363   int bytes_per_row = (BitsPerPixel(raster_resource->format()) *
 364                        raster_resource->size().width()) /
 365                       8;
 366   int chunk_size_in_rows =
 367       std::max(1, max_bytes_per_copy_operation_ / bytes_per_row);
 368   // Align chunk size to 4. Required to support compressed texture formats.
 369   chunk_size_in_rows = MathUtil::RoundUp(chunk_size_in_rows, 4);
 370   int y = 0;
 371   int height = raster_resource->size().height();
 372   while (y < height) {
 373     int failed_attempts = 0;
 374     while ((pending_copy_operations_.size() + issued_copy_operation_count_) >=
 375            kMaxCopyOperations) {
 376       // Ignore limit when shutdown is set.
 377       if (shutdown_)
 378         break;
 379
 380       ++failed_attempts;
 381
 382       // Schedule a check that will also wait for operations to complete
 383       // after too many failed attempts.
 384       bool wait_if_needed = failed_attempts > kFailedAttemptsBeforeWaitIfNeeded;
 385
 386       // Schedule a check for completed copy operations if too many operations
 387       // are currently in-flight.
 388       ScheduleCheckForCompletedCopyOperationsWithLockAcquired(wait_if_needed);
 389
 390       {
 391         TRACE_EVENT0("cc", "WaitingForCopyOperationsToComplete");
 392
 393         // Wait for in-flight copy operations to drop below limit.
 394         copy_operation_count_cv_.Wait();
 395       }
 396     }
 397
 398     // There may be more work available, so wake up another worker thread.
 399     copy_operation_count_cv_.Signal();
 400
 401     // Copy at most |chunk_size_in_rows|.
 402     int rows_to_copy = std::min(chunk_size_in_rows, height - y);
 403     DCHECK_GT(rows_to_copy, 0);
 404
 405     // |raster_resource_write_lock| is passed to the first copy operation as it
 406     // needs to be released before we can issue a copy.
 407     pending_copy_operations_.push_back(make_scoped_ptr(new CopyOperation(
 408         raster_resource_write_lock.Pass(), raster_resource, output_resource,
 409         gfx::Rect(0, y, raster_resource->size().width(), rows_to_copy))));
 410     y += rows_to_copy;
 411
 412     // Acquire a sequence number for this copy operation.
 413     sequence = next_copy_operation_sequence_++;
 414
 415     // Increment |bytes_scheduled_since_last_flush_| by the amount of memory
 416     // used for this copy operation.
 417     bytes_scheduled_since_last_flush_ += rows_to_copy * bytes_per_row;
 418
 419     // Post task that will advance last flushed copy operation to |sequence|
 420     // when |bytes_scheduled_since_last_flush_| has reached
 421     // |max_bytes_per_copy_operation_|.
 422     if (bytes_scheduled_since_last_flush_ >= max_bytes_per_copy_operation_) {
 423       task_runner_->PostTask(
 424           FROM_HERE,
 425           base::Bind(&OneCopyTileTaskWorkerPool::AdvanceLastFlushedCopyTo,
 426                      weak_ptr_factory_.GetWeakPtr(), sequence));
 427       bytes_scheduled_since_last_flush_ = 0;
 428     }
 429   }
 430
 431   return sequence;
 432 }
 433
 434 void OneCopyTileTaskWorkerPool::AdvanceLastIssuedCopyTo(
 435     CopySequenceNumber sequence) {
 436   if (last_issued_copy_operation_ >= sequence)
 437     return;
 438
 439   IssueCopyOperations(sequence - last_issued_copy_operation_);
 440   last_issued_copy_operation_ = sequence;
 441 }
 442
 443 void OneCopyTileTaskWorkerPool::AdvanceLastFlushedCopyTo(
 444     CopySequenceNumber sequence) {
 445   if (last_flushed_copy_operation_ >= sequence)
 446     return;
 447
 448   AdvanceLastIssuedCopyTo(sequence);
 449
 450   // Flush all issued copy operations.
 451   context_provider_->ContextGL()->ShallowFlushCHROMIUM();
 452   last_flushed_copy_operation_ = last_issued_copy_operation_;
 453 }
 454
 455 void OneCopyTileTaskWorkerPool::OnTaskSetFinished(TaskSet task_set) {
 456   TRACE_EVENT1("cc", "OneCopyTileTaskWorkerPool::OnTaskSetFinished", "task_set",
 457                task_set);
 458
 459   DCHECK(tasks_pending_[task_set]);
 460   tasks_pending_[task_set] = false;
 461   if (tasks_pending_.any()) {
 462     TRACE_EVENT_ASYNC_STEP_INTO1("cc", "ScheduledTasks", this, "running",
 463                                  "state", StateAsValue());
 464   } else {
 465     TRACE_EVENT_ASYNC_END0("cc", "ScheduledTasks", this);
 466   }
 467   client_->DidFinishRunningTileTasks(task_set);
 468 }
 469
 470 void OneCopyTileTaskWorkerPool::IssueCopyOperations(int64 count) {
 471   TRACE_EVENT1("cc", "OneCopyTileTaskWorkerPool::IssueCopyOperations", "count",
 472                count);
 473
 474   CopyOperation::Deque copy_operations;
 475
 476   {
 477     base::AutoLock lock(lock_);
 478
 479     for (int64 i = 0; i < count; ++i) {
 480       DCHECK(!pending_copy_operations_.empty());
 481       copy_operations.push_back(pending_copy_operations_.take_front());
 482     }
 483
 484     // Increment |issued_copy_operation_count_| to reflect the transition of
 485     // copy operations from "pending" to "issued" state.
 486     issued_copy_operation_count_ += copy_operations.size();
 487   }
 488
 489   while (!copy_operations.empty()) {
 490     scoped_ptr<CopyOperation> copy_operation = copy_operations.take_front();
 491
 492     // Remove the write lock.
 493     copy_operation->src_write_lock.reset();
 494
 495     // Copy contents of source resource to destination resource.
 496     resource_provider_->CopyResource(copy_operation->src->id(),
 497                                      copy_operation->dst->id(),
 498                                      copy_operation->rect);
 499   }
 500 }
 501
 502 void OneCopyTileTaskWorkerPool::
 503     ScheduleCheckForCompletedCopyOperationsWithLockAcquired(
 504         bool wait_if_needed) {
 505   lock_.AssertAcquired();
 506
 507   if (check_for_completed_copy_operations_pending_)
 508     return;
 509
 510   base::TimeTicks now = base::TimeTicks::Now();
 511
 512   // Schedule a check for completed copy operations as soon as possible but
 513   // don't allow two consecutive checks to be scheduled to run less than the
 514   // tick rate apart.
 515   base::TimeTicks next_check_for_completed_copy_operations_time =
 516       std::max(last_check_for_completed_copy_operations_time_ +
 517                    base::TimeDelta::FromMilliseconds(
 518                        kCheckForCompletedCopyOperationsTickRateMs),
 519                now);
 520
 521   task_runner_->PostDelayedTask(
 522       FROM_HERE,
 523       base::Bind(&OneCopyTileTaskWorkerPool::CheckForCompletedCopyOperations,
 524                  weak_ptr_factory_.GetWeakPtr(), wait_if_needed),
 525       next_check_for_completed_copy_operations_time - now);
 526
 527   last_check_for_completed_copy_operations_time_ =
 528       next_check_for_completed_copy_operations_time;
 529   check_for_completed_copy_operations_pending_ = true;
 530 }
 531
 532 void OneCopyTileTaskWorkerPool::CheckForCompletedCopyOperations(
 533     bool wait_if_needed) {
 534   TRACE_EVENT1("cc",
 535                "OneCopyTileTaskWorkerPool::CheckForCompletedCopyOperations",
 536                "wait_if_needed", wait_if_needed);
 537
 538   resource_pool_->CheckBusyResources(wait_if_needed);
 539
 540   {
 541     base::AutoLock lock(lock_);
 542
 543     DCHECK(check_for_completed_copy_operations_pending_);
 544     check_for_completed_copy_operations_pending_ = false;
 545
 546     // The number of busy resources in the pool reflects the number of issued
 547     // copy operations that have not yet completed.
 548     issued_copy_operation_count_ = resource_pool_->busy_resource_count();
 549
 550     // There may be work blocked on too many in-flight copy operations, so wake
 551     // up a worker thread.
 552     copy_operation_count_cv_.Signal();
 553   }
 554 }
 555
 556 scoped_refptr<base::trace_event::ConvertableToTraceFormat>
 557 OneCopyTileTaskWorkerPool::StateAsValue() const {
 558   scoped_refptr<base::trace_event::TracedValue> state =
 559       new base::trace_event::TracedValue();
 560
 561   state->BeginArray("tasks_pending");
 562   for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set)
 563     state->AppendBoolean(tasks_pending_[task_set]);
 564   state->EndArray();
 565   state->BeginDictionary("staging_state");
 566   StagingStateAsValueInto(state.get());
 567   state->EndDictionary();
 568
 569   return state;
 570 }
 571
 572 void OneCopyTileTaskWorkerPool::StagingStateAsValueInto(
 573     base::trace_event::TracedValue* staging_state) const {
 574   staging_state->SetInteger(
 575       "staging_resource_count",
 576       static_cast<int>(resource_pool_->total_resource_count()));
 577   staging_state->SetInteger(
 578       "bytes_used_for_staging_resources",
 579       static_cast<int>(resource_pool_->total_memory_usage_bytes()));
 580   staging_state->SetInteger(
 581       "pending_copy_count",
 582       static_cast<int>(resource_pool_->total_resource_count() -
 583                        resource_pool_->acquired_resource_count()));
 584   staging_state->SetInteger(
 585       "bytes_pending_copy",
 586       static_cast<int>(resource_pool_->total_memory_usage_bytes() -
 587                        resource_pool_->acquired_memory_usage_bytes()));
 588 }
 589
 590 }  // namespace cc