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