| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright 2011 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/scheduler/scheduler.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "base/auto_reset.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/profiler/scoped_tracker.h" | |
| 12 #include "base/single_thread_task_runner.h" | |
| 13 #include "base/trace_event/trace_event.h" | |
| 14 #include "base/trace_event/trace_event_argument.h" | |
| 15 #include "cc/debug/traced_value.h" | |
| 16 #include "cc/scheduler/delay_based_time_source.h" | |
| 17 #include "ui/gfx/frame_time.h" | |
| 18 | |
| 19 namespace cc { | |
| 20 | |
| 21 BeginFrameSource* SchedulerFrameSourcesConstructor::ConstructPrimaryFrameSource( | |
| 22 Scheduler* scheduler) { | |
| 23 if (scheduler->settings_.use_external_begin_frame_source) { | |
| 24 TRACE_EVENT1("cc", | |
| 25 "Scheduler::Scheduler()", | |
| 26 "PrimaryFrameSource", | |
| 27 "ExternalBeginFrameSource"); | |
| 28 DCHECK(scheduler->primary_frame_source_internal_) | |
| 29 << "Need external BeginFrameSource"; | |
| 30 return scheduler->primary_frame_source_internal_.get(); | |
| 31 } else { | |
| 32 TRACE_EVENT1("cc", | |
| 33 "Scheduler::Scheduler()", | |
| 34 "PrimaryFrameSource", | |
| 35 "SyntheticBeginFrameSource"); | |
| 36 scoped_ptr<SyntheticBeginFrameSource> synthetic_source = | |
| 37 SyntheticBeginFrameSource::Create(scheduler->task_runner_.get(), | |
| 38 scheduler->Now(), | |
| 39 BeginFrameArgs::DefaultInterval()); | |
| 40 | |
| 41 DCHECK(!scheduler->vsync_observer_); | |
| 42 scheduler->vsync_observer_ = synthetic_source.get(); | |
| 43 | |
| 44 DCHECK(!scheduler->primary_frame_source_internal_); | |
| 45 scheduler->primary_frame_source_internal_ = synthetic_source.Pass(); | |
| 46 return scheduler->primary_frame_source_internal_.get(); | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 BeginFrameSource* | |
| 51 SchedulerFrameSourcesConstructor::ConstructBackgroundFrameSource( | |
| 52 Scheduler* scheduler) { | |
| 53 TRACE_EVENT1("cc", | |
| 54 "Scheduler::Scheduler()", | |
| 55 "BackgroundFrameSource", | |
| 56 "SyntheticBeginFrameSource"); | |
| 57 DCHECK(!(scheduler->background_frame_source_internal_)); | |
| 58 scheduler->background_frame_source_internal_ = | |
| 59 SyntheticBeginFrameSource::Create( | |
| 60 scheduler->task_runner_.get(), scheduler->Now(), | |
| 61 scheduler->settings_.background_frame_interval); | |
| 62 return scheduler->background_frame_source_internal_.get(); | |
| 63 } | |
| 64 | |
| 65 BeginFrameSource* | |
| 66 SchedulerFrameSourcesConstructor::ConstructUnthrottledFrameSource( | |
| 67 Scheduler* scheduler) { | |
| 68 TRACE_EVENT1("cc", "Scheduler::Scheduler()", "UnthrottledFrameSource", | |
| 69 "BackToBackBeginFrameSource"); | |
| 70 DCHECK(!scheduler->unthrottled_frame_source_internal_); | |
| 71 scheduler->unthrottled_frame_source_internal_ = | |
| 72 BackToBackBeginFrameSource::Create(scheduler->task_runner_.get()); | |
| 73 return scheduler->unthrottled_frame_source_internal_.get(); | |
| 74 } | |
| 75 | |
| 76 Scheduler::Scheduler( | |
| 77 SchedulerClient* client, | |
| 78 const SchedulerSettings& scheduler_settings, | |
| 79 int layer_tree_host_id, | |
| 80 const scoped_refptr<base::SingleThreadTaskRunner>& task_runner, | |
| 81 scoped_ptr<BeginFrameSource> external_begin_frame_source, | |
| 82 SchedulerFrameSourcesConstructor* frame_sources_constructor) | |
| 83 : frame_source_(), | |
| 84 primary_frame_source_(NULL), | |
| 85 background_frame_source_(NULL), | |
| 86 primary_frame_source_internal_(external_begin_frame_source.Pass()), | |
| 87 background_frame_source_internal_(), | |
| 88 vsync_observer_(NULL), | |
| 89 throttle_frame_production_(scheduler_settings.throttle_frame_production), | |
| 90 settings_(scheduler_settings), | |
| 91 client_(client), | |
| 92 layer_tree_host_id_(layer_tree_host_id), | |
| 93 task_runner_(task_runner), | |
| 94 state_machine_(scheduler_settings), | |
| 95 inside_process_scheduled_actions_(false), | |
| 96 inside_action_(SchedulerStateMachine::ACTION_NONE), | |
| 97 weak_factory_(this) { | |
| 98 TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler"), | |
| 99 "Scheduler::Scheduler", | |
| 100 "settings", | |
| 101 settings_.AsValue()); | |
| 102 DCHECK(client_); | |
| 103 DCHECK(!state_machine_.BeginFrameNeeded()); | |
| 104 | |
| 105 begin_retro_frame_closure_ = | |
| 106 base::Bind(&Scheduler::BeginRetroFrame, weak_factory_.GetWeakPtr()); | |
| 107 begin_impl_frame_deadline_closure_ = base::Bind( | |
| 108 &Scheduler::OnBeginImplFrameDeadline, weak_factory_.GetWeakPtr()); | |
| 109 poll_for_draw_triggers_closure_ = base::Bind( | |
| 110 &Scheduler::PollForAnticipatedDrawTriggers, weak_factory_.GetWeakPtr()); | |
| 111 advance_commit_state_closure_ = base::Bind( | |
| 112 &Scheduler::PollToAdvanceCommitState, weak_factory_.GetWeakPtr()); | |
| 113 | |
| 114 frame_source_ = BeginFrameSourceMultiplexer::Create(); | |
| 115 frame_source_->AddObserver(this); | |
| 116 | |
| 117 // Primary frame source | |
| 118 primary_frame_source_ = | |
| 119 frame_sources_constructor->ConstructPrimaryFrameSource(this); | |
| 120 frame_source_->AddSource(primary_frame_source_); | |
| 121 primary_frame_source_->SetClientReady(); | |
| 122 | |
| 123 // Background ticking frame source | |
| 124 background_frame_source_ = | |
| 125 frame_sources_constructor->ConstructBackgroundFrameSource(this); | |
| 126 frame_source_->AddSource(background_frame_source_); | |
| 127 | |
| 128 // Unthrottled frame source | |
| 129 unthrottled_frame_source_ = | |
| 130 frame_sources_constructor->ConstructUnthrottledFrameSource(this); | |
| 131 frame_source_->AddSource(unthrottled_frame_source_); | |
| 132 } | |
| 133 | |
| 134 Scheduler::~Scheduler() { | |
| 135 if (frame_source_->NeedsBeginFrames()) | |
| 136 frame_source_->SetNeedsBeginFrames(false); | |
| 137 } | |
| 138 | |
| 139 base::TimeTicks Scheduler::Now() const { | |
| 140 base::TimeTicks now = gfx::FrameTime::Now(); | |
| 141 TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.now"), | |
| 142 "Scheduler::Now", | |
| 143 "now", | |
| 144 now); | |
| 145 return now; | |
| 146 } | |
| 147 | |
| 148 void Scheduler::CommitVSyncParameters(base::TimeTicks timebase, | |
| 149 base::TimeDelta interval) { | |
| 150 // TODO(brianderson): We should not be receiving 0 intervals. | |
| 151 if (interval == base::TimeDelta()) | |
| 152 interval = BeginFrameArgs::DefaultInterval(); | |
| 153 | |
| 154 if (vsync_observer_) | |
| 155 vsync_observer_->OnUpdateVSyncParameters(timebase, interval); | |
| 156 } | |
| 157 | |
| 158 void Scheduler::SetEstimatedParentDrawTime(base::TimeDelta draw_time) { | |
| 159 DCHECK_GE(draw_time.ToInternalValue(), 0); | |
| 160 estimated_parent_draw_time_ = draw_time; | |
| 161 } | |
| 162 | |
| 163 void Scheduler::SetCanStart() { | |
| 164 state_machine_.SetCanStart(); | |
| 165 ProcessScheduledActions(); | |
| 166 } | |
| 167 | |
| 168 void Scheduler::UpdateActiveFrameSource() { | |
| 169 if (state_machine_.visible()) { | |
| 170 if (throttle_frame_production_) { | |
| 171 frame_source_->SetActiveSource(primary_frame_source_); | |
| 172 } else { | |
| 173 frame_source_->SetActiveSource(unthrottled_frame_source_); | |
| 174 } | |
| 175 } else { | |
| 176 frame_source_->SetActiveSource(background_frame_source_); | |
| 177 } | |
| 178 ProcessScheduledActions(); | |
| 179 } | |
| 180 | |
| 181 void Scheduler::SetVisible(bool visible) { | |
| 182 state_machine_.SetVisible(visible); | |
| 183 UpdateActiveFrameSource(); | |
| 184 } | |
| 185 | |
| 186 void Scheduler::SetCanDraw(bool can_draw) { | |
| 187 state_machine_.SetCanDraw(can_draw); | |
| 188 ProcessScheduledActions(); | |
| 189 } | |
| 190 | |
| 191 void Scheduler::NotifyReadyToActivate() { | |
| 192 state_machine_.NotifyReadyToActivate(); | |
| 193 ProcessScheduledActions(); | |
| 194 } | |
| 195 | |
| 196 void Scheduler::NotifyReadyToDraw() { | |
| 197 // Empty for now, until we take action based on the notification as part of | |
| 198 // crbugs 352894, 383157, 421923. | |
| 199 } | |
| 200 | |
| 201 void Scheduler::SetThrottleFrameProduction(bool throttle) { | |
| 202 throttle_frame_production_ = throttle; | |
| 203 UpdateActiveFrameSource(); | |
| 204 } | |
| 205 | |
| 206 void Scheduler::SetNeedsCommit() { | |
| 207 state_machine_.SetNeedsCommit(); | |
| 208 ProcessScheduledActions(); | |
| 209 } | |
| 210 | |
| 211 void Scheduler::SetNeedsRedraw() { | |
| 212 state_machine_.SetNeedsRedraw(); | |
| 213 ProcessScheduledActions(); | |
| 214 } | |
| 215 | |
| 216 void Scheduler::SetNeedsAnimate() { | |
| 217 state_machine_.SetNeedsAnimate(); | |
| 218 ProcessScheduledActions(); | |
| 219 } | |
| 220 | |
| 221 void Scheduler::SetNeedsPrepareTiles() { | |
| 222 DCHECK(!IsInsideAction(SchedulerStateMachine::ACTION_PREPARE_TILES)); | |
| 223 state_machine_.SetNeedsPrepareTiles(); | |
| 224 ProcessScheduledActions(); | |
| 225 } | |
| 226 | |
| 227 void Scheduler::SetMaxSwapsPending(int max) { | |
| 228 state_machine_.SetMaxSwapsPending(max); | |
| 229 } | |
| 230 | |
| 231 void Scheduler::DidSwapBuffers() { | |
| 232 state_machine_.DidSwapBuffers(); | |
| 233 | |
| 234 // There is no need to call ProcessScheduledActions here because | |
| 235 // swapping should not trigger any new actions. | |
| 236 if (!inside_process_scheduled_actions_) { | |
| 237 DCHECK_EQ(state_machine_.NextAction(), SchedulerStateMachine::ACTION_NONE); | |
| 238 } | |
| 239 } | |
| 240 | |
| 241 void Scheduler::DidSwapBuffersComplete() { | |
| 242 state_machine_.DidSwapBuffersComplete(); | |
| 243 ProcessScheduledActions(); | |
| 244 } | |
| 245 | |
| 246 void Scheduler::SetImplLatencyTakesPriority(bool impl_latency_takes_priority) { | |
| 247 state_machine_.SetImplLatencyTakesPriority(impl_latency_takes_priority); | |
| 248 ProcessScheduledActions(); | |
| 249 } | |
| 250 | |
| 251 void Scheduler::NotifyReadyToCommit() { | |
| 252 TRACE_EVENT0("cc", "Scheduler::NotifyReadyToCommit"); | |
| 253 state_machine_.NotifyReadyToCommit(); | |
| 254 ProcessScheduledActions(); | |
| 255 } | |
| 256 | |
| 257 void Scheduler::BeginMainFrameAborted(CommitEarlyOutReason reason) { | |
| 258 TRACE_EVENT1("cc", "Scheduler::BeginMainFrameAborted", "reason", | |
| 259 CommitEarlyOutReasonToString(reason)); | |
| 260 state_machine_.BeginMainFrameAborted(reason); | |
| 261 ProcessScheduledActions(); | |
| 262 } | |
| 263 | |
| 264 void Scheduler::DidPrepareTiles() { | |
| 265 state_machine_.DidPrepareTiles(); | |
| 266 } | |
| 267 | |
| 268 void Scheduler::DidLoseOutputSurface() { | |
| 269 TRACE_EVENT0("cc", "Scheduler::DidLoseOutputSurface"); | |
| 270 begin_retro_frame_args_.clear(); | |
| 271 begin_retro_frame_task_.Cancel(); | |
| 272 state_machine_.DidLoseOutputSurface(); | |
| 273 ProcessScheduledActions(); | |
| 274 } | |
| 275 | |
| 276 void Scheduler::DidCreateAndInitializeOutputSurface() { | |
| 277 TRACE_EVENT0("cc", "Scheduler::DidCreateAndInitializeOutputSurface"); | |
| 278 DCHECK(!frame_source_->NeedsBeginFrames()); | |
| 279 DCHECK(begin_impl_frame_deadline_task_.IsCancelled()); | |
| 280 state_machine_.DidCreateAndInitializeOutputSurface(); | |
| 281 ProcessScheduledActions(); | |
| 282 } | |
| 283 | |
| 284 void Scheduler::NotifyBeginMainFrameStarted() { | |
| 285 TRACE_EVENT0("cc", "Scheduler::NotifyBeginMainFrameStarted"); | |
| 286 state_machine_.NotifyBeginMainFrameStarted(); | |
| 287 } | |
| 288 | |
| 289 base::TimeTicks Scheduler::AnticipatedDrawTime() const { | |
| 290 if (!frame_source_->NeedsBeginFrames() || | |
| 291 begin_impl_frame_args_.interval <= base::TimeDelta()) | |
| 292 return base::TimeTicks(); | |
| 293 | |
| 294 base::TimeTicks now = Now(); | |
| 295 base::TimeTicks timebase = std::max(begin_impl_frame_args_.frame_time, | |
| 296 begin_impl_frame_args_.deadline); | |
| 297 int64 intervals = 1 + ((now - timebase) / begin_impl_frame_args_.interval); | |
| 298 return timebase + (begin_impl_frame_args_.interval * intervals); | |
| 299 } | |
| 300 | |
| 301 base::TimeTicks Scheduler::LastBeginImplFrameTime() { | |
| 302 return begin_impl_frame_args_.frame_time; | |
| 303 } | |
| 304 | |
| 305 void Scheduler::SetupNextBeginFrameIfNeeded() { | |
| 306 // Never call SetNeedsBeginFrames if the frame source already has the right | |
| 307 // value. | |
| 308 if (frame_source_->NeedsBeginFrames() != state_machine_.BeginFrameNeeded()) { | |
| 309 if (state_machine_.BeginFrameNeeded()) { | |
| 310 // Call SetNeedsBeginFrames(true) as soon as possible. | |
| 311 frame_source_->SetNeedsBeginFrames(true); | |
| 312 } else if (state_machine_.begin_impl_frame_state() == | |
| 313 SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE) { | |
| 314 // Call SetNeedsBeginFrames(false) in between frames only. | |
| 315 frame_source_->SetNeedsBeginFrames(false); | |
| 316 client_->SendBeginMainFrameNotExpectedSoon(); | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 PostBeginRetroFrameIfNeeded(); | |
| 321 } | |
| 322 | |
| 323 // We may need to poll when we can't rely on BeginFrame to advance certain | |
| 324 // state or to avoid deadlock. | |
| 325 void Scheduler::SetupPollingMechanisms() { | |
| 326 bool needs_advance_commit_state_timer = false; | |
| 327 // Setup PollForAnticipatedDrawTriggers if we need to monitor state but | |
| 328 // aren't expecting any more BeginFrames. This should only be needed by | |
| 329 // the synchronous compositor when BeginFrameNeeded is false. | |
| 330 if (state_machine_.ShouldPollForAnticipatedDrawTriggers()) { | |
| 331 DCHECK(!state_machine_.SupportsProactiveBeginFrame()); | |
| 332 if (poll_for_draw_triggers_task_.IsCancelled()) { | |
| 333 poll_for_draw_triggers_task_.Reset(poll_for_draw_triggers_closure_); | |
| 334 base::TimeDelta delay = begin_impl_frame_args_.IsValid() | |
| 335 ? begin_impl_frame_args_.interval | |
| 336 : BeginFrameArgs::DefaultInterval(); | |
| 337 task_runner_->PostDelayedTask( | |
| 338 FROM_HERE, poll_for_draw_triggers_task_.callback(), delay); | |
| 339 } | |
| 340 } else { | |
| 341 poll_for_draw_triggers_task_.Cancel(); | |
| 342 | |
| 343 // At this point we'd prefer to advance through the commit flow by | |
| 344 // drawing a frame, however it's possible that the frame rate controller | |
| 345 // will not give us a BeginFrame until the commit completes. See | |
| 346 // crbug.com/317430 for an example of a swap ack being held on commit. Thus | |
| 347 // we set a repeating timer to poll on ProcessScheduledActions until we | |
| 348 // successfully reach BeginFrame. Synchronous compositor does not use | |
| 349 // frame rate controller or have the circular wait in the bug. | |
| 350 if (IsBeginMainFrameSentOrStarted() && | |
| 351 !settings_.using_synchronous_renderer_compositor) { | |
| 352 needs_advance_commit_state_timer = true; | |
| 353 } | |
| 354 } | |
| 355 | |
| 356 if (needs_advance_commit_state_timer) { | |
| 357 if (advance_commit_state_task_.IsCancelled() && | |
| 358 begin_impl_frame_args_.IsValid()) { | |
| 359 // Since we'd rather get a BeginImplFrame by the normal mechanism, we | |
| 360 // set the interval to twice the interval from the previous frame. | |
| 361 advance_commit_state_task_.Reset(advance_commit_state_closure_); | |
| 362 task_runner_->PostDelayedTask(FROM_HERE, | |
| 363 advance_commit_state_task_.callback(), | |
| 364 begin_impl_frame_args_.interval * 2); | |
| 365 } | |
| 366 } else { | |
| 367 advance_commit_state_task_.Cancel(); | |
| 368 } | |
| 369 } | |
| 370 | |
| 371 // BeginFrame is the mechanism that tells us that now is a good time to start | |
| 372 // making a frame. Usually this means that user input for the frame is complete. | |
| 373 // If the scheduler is busy, we queue the BeginFrame to be handled later as | |
| 374 // a BeginRetroFrame. | |
| 375 bool Scheduler::OnBeginFrameMixInDelegate(const BeginFrameArgs& args) { | |
| 376 TRACE_EVENT1("cc,benchmark", "Scheduler::BeginFrame", "args", args.AsValue()); | |
| 377 | |
| 378 // Deliver BeginFrames to children. | |
| 379 if (state_machine_.children_need_begin_frames()) { | |
| 380 BeginFrameArgs adjusted_args_for_children(args); | |
| 381 // Adjust a deadline for child schedulers. | |
| 382 // TODO(simonhong): Once we have commitless update, we can get rid of | |
| 383 // BeginMainFrameToCommitDurationEstimate() + | |
| 384 // CommitToActivateDurationEstimate(). | |
| 385 adjusted_args_for_children.deadline -= | |
| 386 (client_->BeginMainFrameToCommitDurationEstimate() + | |
| 387 client_->CommitToActivateDurationEstimate() + | |
| 388 client_->DrawDurationEstimate() + EstimatedParentDrawTime()); | |
| 389 client_->SendBeginFramesToChildren(adjusted_args_for_children); | |
| 390 } | |
| 391 | |
| 392 // We have just called SetNeedsBeginFrame(true) and the BeginFrameSource has | |
| 393 // sent us the last BeginFrame we have missed. As we might not be able to | |
| 394 // actually make rendering for this call, handle it like a "retro frame". | |
| 395 // TODO(brainderson): Add a test for this functionality ASAP! | |
| 396 if (args.type == BeginFrameArgs::MISSED) { | |
| 397 begin_retro_frame_args_.push_back(args); | |
| 398 PostBeginRetroFrameIfNeeded(); | |
| 399 return true; | |
| 400 } | |
| 401 | |
| 402 BeginFrameArgs adjusted_args(args); | |
| 403 adjusted_args.deadline -= EstimatedParentDrawTime(); | |
| 404 | |
| 405 bool should_defer_begin_frame; | |
| 406 if (settings_.using_synchronous_renderer_compositor) { | |
| 407 should_defer_begin_frame = false; | |
| 408 } else { | |
| 409 should_defer_begin_frame = | |
| 410 !begin_retro_frame_args_.empty() || | |
| 411 !begin_retro_frame_task_.IsCancelled() || | |
| 412 !frame_source_->NeedsBeginFrames() || | |
| 413 (state_machine_.begin_impl_frame_state() != | |
| 414 SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE); | |
| 415 } | |
| 416 | |
| 417 if (should_defer_begin_frame) { | |
| 418 begin_retro_frame_args_.push_back(adjusted_args); | |
| 419 TRACE_EVENT_INSTANT0( | |
| 420 "cc", "Scheduler::BeginFrame deferred", TRACE_EVENT_SCOPE_THREAD); | |
| 421 // Queuing the frame counts as "using it", so we need to return true. | |
| 422 } else { | |
| 423 BeginImplFrame(adjusted_args); | |
| 424 } | |
| 425 return true; | |
| 426 } | |
| 427 | |
| 428 void Scheduler::SetChildrenNeedBeginFrames(bool children_need_begin_frames) { | |
| 429 state_machine_.SetChildrenNeedBeginFrames(children_need_begin_frames); | |
| 430 ProcessScheduledActions(); | |
| 431 } | |
| 432 | |
| 433 // BeginRetroFrame is called for BeginFrames that we've deferred because | |
| 434 // the scheduler was in the middle of processing a previous BeginFrame. | |
| 435 void Scheduler::BeginRetroFrame() { | |
| 436 TRACE_EVENT0("cc,benchmark", "Scheduler::BeginRetroFrame"); | |
| 437 DCHECK(!settings_.using_synchronous_renderer_compositor); | |
| 438 DCHECK(!begin_retro_frame_args_.empty()); | |
| 439 DCHECK(!begin_retro_frame_task_.IsCancelled()); | |
| 440 DCHECK_EQ(state_machine_.begin_impl_frame_state(), | |
| 441 SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE); | |
| 442 | |
| 443 begin_retro_frame_task_.Cancel(); | |
| 444 | |
| 445 // Discard expired BeginRetroFrames | |
| 446 // Today, we should always end up with at most one un-expired BeginRetroFrame | |
| 447 // because deadlines will not be greater than the next frame time. We don't | |
| 448 // DCHECK though because some systems don't always have monotonic timestamps. | |
| 449 // TODO(brianderson): In the future, long deadlines could result in us not | |
| 450 // draining the queue if we don't catch up. If we consistently can't catch | |
| 451 // up, our fallback should be to lower our frame rate. | |
| 452 base::TimeTicks now = Now(); | |
| 453 | |
| 454 while (!begin_retro_frame_args_.empty()) { | |
| 455 const BeginFrameArgs& args = begin_retro_frame_args_.front(); | |
| 456 base::TimeTicks expiration_time = args.frame_time + args.interval; | |
| 457 if (now <= expiration_time) | |
| 458 break; | |
| 459 TRACE_EVENT_INSTANT2( | |
| 460 "cc", "Scheduler::BeginRetroFrame discarding", TRACE_EVENT_SCOPE_THREAD, | |
| 461 "expiration_time - now", (expiration_time - now).InMillisecondsF(), | |
| 462 "BeginFrameArgs", begin_retro_frame_args_.front().AsValue()); | |
| 463 begin_retro_frame_args_.pop_front(); | |
| 464 frame_source_->DidFinishFrame(begin_retro_frame_args_.size()); | |
| 465 } | |
| 466 | |
| 467 if (begin_retro_frame_args_.empty()) { | |
| 468 TRACE_EVENT_INSTANT0("cc", | |
| 469 "Scheduler::BeginRetroFrames all expired", | |
| 470 TRACE_EVENT_SCOPE_THREAD); | |
| 471 } else { | |
| 472 BeginFrameArgs front = begin_retro_frame_args_.front(); | |
| 473 begin_retro_frame_args_.pop_front(); | |
| 474 BeginImplFrame(front); | |
| 475 } | |
| 476 } | |
| 477 | |
| 478 // There could be a race between the posted BeginRetroFrame and a new | |
| 479 // BeginFrame arriving via the normal mechanism. Scheduler::BeginFrame | |
| 480 // will check if there is a pending BeginRetroFrame to ensure we handle | |
| 481 // BeginFrames in FIFO order. | |
| 482 void Scheduler::PostBeginRetroFrameIfNeeded() { | |
| 483 TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler"), | |
| 484 "Scheduler::PostBeginRetroFrameIfNeeded", | |
| 485 "state", | |
| 486 AsValue()); | |
| 487 if (!frame_source_->NeedsBeginFrames()) | |
| 488 return; | |
| 489 | |
| 490 if (begin_retro_frame_args_.empty() || !begin_retro_frame_task_.IsCancelled()) | |
| 491 return; | |
| 492 | |
| 493 // begin_retro_frame_args_ should always be empty for the | |
| 494 // synchronous compositor. | |
| 495 DCHECK(!settings_.using_synchronous_renderer_compositor); | |
| 496 | |
| 497 if (state_machine_.begin_impl_frame_state() != | |
| 498 SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE) | |
| 499 return; | |
| 500 | |
| 501 begin_retro_frame_task_.Reset(begin_retro_frame_closure_); | |
| 502 | |
| 503 task_runner_->PostTask(FROM_HERE, begin_retro_frame_task_.callback()); | |
| 504 } | |
| 505 | |
| 506 // BeginImplFrame starts a compositor frame that will wait up until a deadline | |
| 507 // for a BeginMainFrame+activation to complete before it times out and draws | |
| 508 // any asynchronous animation and scroll/pinch updates. | |
| 509 void Scheduler::BeginImplFrame(const BeginFrameArgs& args) { | |
| 510 bool main_thread_is_in_high_latency_mode = | |
| 511 state_machine_.MainThreadIsInHighLatencyMode(); | |
| 512 TRACE_EVENT2("cc,benchmark", | |
| 513 "Scheduler::BeginImplFrame", | |
| 514 "args", | |
| 515 args.AsValue(), | |
| 516 "main_thread_is_high_latency", | |
| 517 main_thread_is_in_high_latency_mode); | |
| 518 TRACE_COUNTER1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler"), | |
| 519 "MainThreadLatency", | |
| 520 main_thread_is_in_high_latency_mode); | |
| 521 DCHECK_EQ(state_machine_.begin_impl_frame_state(), | |
| 522 SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE); | |
| 523 DCHECK(state_machine_.HasInitializedOutputSurface()); | |
| 524 | |
| 525 advance_commit_state_task_.Cancel(); | |
| 526 | |
| 527 begin_impl_frame_args_ = args; | |
| 528 begin_impl_frame_args_.deadline -= client_->DrawDurationEstimate(); | |
| 529 | |
| 530 if (!state_machine_.impl_latency_takes_priority() && | |
| 531 main_thread_is_in_high_latency_mode && | |
| 532 CanCommitAndActivateBeforeDeadline()) { | |
| 533 state_machine_.SetSkipNextBeginMainFrameToReduceLatency(); | |
| 534 } | |
| 535 | |
| 536 state_machine_.OnBeginImplFrame(); | |
| 537 client_->WillBeginImplFrame(begin_impl_frame_args_); | |
| 538 | |
| 539 ProcessScheduledActions(); | |
| 540 | |
| 541 state_machine_.OnBeginImplFrameDeadlinePending(); | |
| 542 | |
| 543 if (settings_.using_synchronous_renderer_compositor) { | |
| 544 // The synchronous renderer compositor has to make its GL calls | |
| 545 // within this call. | |
| 546 // TODO(brianderson): Have the OutputSurface initiate the deadline tasks | |
| 547 // so the synchronous renderer compositor can take advantage of splitting | |
| 548 // up the BeginImplFrame and deadline as well. | |
| 549 OnBeginImplFrameDeadline(); | |
| 550 } else { | |
| 551 ScheduleBeginImplFrameDeadline(); | |
| 552 } | |
| 553 } | |
| 554 | |
| 555 void Scheduler::ScheduleBeginImplFrameDeadline() { | |
| 556 // The synchronous compositor does not post a deadline task. | |
| 557 DCHECK(!settings_.using_synchronous_renderer_compositor); | |
| 558 | |
| 559 begin_impl_frame_deadline_task_.Cancel(); | |
| 560 begin_impl_frame_deadline_task_.Reset(begin_impl_frame_deadline_closure_); | |
| 561 | |
| 562 begin_impl_frame_deadline_mode_ = | |
| 563 state_machine_.CurrentBeginImplFrameDeadlineMode(); | |
| 564 | |
| 565 base::TimeTicks deadline; | |
| 566 switch (begin_impl_frame_deadline_mode_) { | |
| 567 case SchedulerStateMachine::BEGIN_IMPL_FRAME_DEADLINE_MODE_IMMEDIATE: | |
| 568 // We are ready to draw a new active tree immediately. | |
| 569 // We don't use Now() here because it's somewhat expensive to call. | |
| 570 deadline = base::TimeTicks(); | |
| 571 break; | |
| 572 case SchedulerStateMachine::BEGIN_IMPL_FRAME_DEADLINE_MODE_REGULAR: | |
| 573 // We are animating on the impl thread but we can wait for some time. | |
| 574 deadline = begin_impl_frame_args_.deadline; | |
| 575 break; | |
| 576 case SchedulerStateMachine::BEGIN_IMPL_FRAME_DEADLINE_MODE_LATE: | |
| 577 // We are blocked for one reason or another and we should wait. | |
| 578 // TODO(brianderson): Handle long deadlines (that are past the next | |
| 579 // frame's frame time) properly instead of using this hack. | |
| 580 deadline = | |
| 581 begin_impl_frame_args_.frame_time + begin_impl_frame_args_.interval; | |
| 582 break; | |
| 583 } | |
| 584 | |
| 585 TRACE_EVENT1( | |
| 586 "cc", "Scheduler::ScheduleBeginImplFrameDeadline", "deadline", deadline); | |
| 587 | |
| 588 base::TimeDelta delta = deadline - Now(); | |
| 589 if (delta <= base::TimeDelta()) | |
| 590 delta = base::TimeDelta(); | |
| 591 task_runner_->PostDelayedTask( | |
| 592 FROM_HERE, begin_impl_frame_deadline_task_.callback(), delta); | |
| 593 } | |
| 594 | |
| 595 void Scheduler::RescheduleBeginImplFrameDeadlineIfNeeded() { | |
| 596 if (settings_.using_synchronous_renderer_compositor) | |
| 597 return; | |
| 598 | |
| 599 if (state_machine_.begin_impl_frame_state() != | |
| 600 SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME) | |
| 601 return; | |
| 602 | |
| 603 if (begin_impl_frame_deadline_mode_ != | |
| 604 state_machine_.CurrentBeginImplFrameDeadlineMode()) | |
| 605 ScheduleBeginImplFrameDeadline(); | |
| 606 } | |
| 607 | |
| 608 void Scheduler::OnBeginImplFrameDeadline() { | |
| 609 TRACE_EVENT0("cc,benchmark", "Scheduler::OnBeginImplFrameDeadline"); | |
| 610 begin_impl_frame_deadline_task_.Cancel(); | |
| 611 // We split the deadline actions up into two phases so the state machine | |
| 612 // has a chance to trigger actions that should occur durring and after | |
| 613 // the deadline separately. For example: | |
| 614 // * Sending the BeginMainFrame will not occur after the deadline in | |
| 615 // order to wait for more user-input before starting the next commit. | |
| 616 // * Creating a new OuputSurface will not occur during the deadline in | |
| 617 // order to allow the state machine to "settle" first. | |
| 618 | |
| 619 // TODO(robliao): Remove ScopedTracker below once crbug.com/461509 is fixed. | |
| 620 tracked_objects::ScopedTracker tracking_profile1( | |
| 621 FROM_HERE_WITH_EXPLICIT_FUNCTION( | |
| 622 "461509 Scheduler::OnBeginImplFrameDeadline1")); | |
| 623 state_machine_.OnBeginImplFrameDeadline(); | |
| 624 ProcessScheduledActions(); | |
| 625 state_machine_.OnBeginImplFrameIdle(); | |
| 626 ProcessScheduledActions(); | |
| 627 | |
| 628 client_->DidBeginImplFrameDeadline(); | |
| 629 frame_source_->DidFinishFrame(begin_retro_frame_args_.size()); | |
| 630 } | |
| 631 | |
| 632 void Scheduler::PollForAnticipatedDrawTriggers() { | |
| 633 TRACE_EVENT0("cc", "Scheduler::PollForAnticipatedDrawTriggers"); | |
| 634 poll_for_draw_triggers_task_.Cancel(); | |
| 635 state_machine_.DidEnterPollForAnticipatedDrawTriggers(); | |
| 636 ProcessScheduledActions(); | |
| 637 state_machine_.DidLeavePollForAnticipatedDrawTriggers(); | |
| 638 } | |
| 639 | |
| 640 void Scheduler::PollToAdvanceCommitState() { | |
| 641 TRACE_EVENT0("cc", "Scheduler::PollToAdvanceCommitState"); | |
| 642 advance_commit_state_task_.Cancel(); | |
| 643 ProcessScheduledActions(); | |
| 644 } | |
| 645 | |
| 646 void Scheduler::DrawAndSwapIfPossible() { | |
| 647 DrawResult result = client_->ScheduledActionDrawAndSwapIfPossible(); | |
| 648 state_machine_.DidDrawIfPossibleCompleted(result); | |
| 649 } | |
| 650 | |
| 651 void Scheduler::SetDeferCommits(bool defer_commits) { | |
| 652 TRACE_EVENT1("cc", "Scheduler::SetDeferCommits", | |
| 653 "defer_commits", | |
| 654 defer_commits); | |
| 655 state_machine_.SetDeferCommits(defer_commits); | |
| 656 ProcessScheduledActions(); | |
| 657 } | |
| 658 | |
| 659 void Scheduler::ProcessScheduledActions() { | |
| 660 // We do not allow ProcessScheduledActions to be recursive. | |
| 661 // The top-level call will iteratively execute the next action for us anyway. | |
| 662 if (inside_process_scheduled_actions_) | |
| 663 return; | |
| 664 | |
| 665 base::AutoReset<bool> mark_inside(&inside_process_scheduled_actions_, true); | |
| 666 | |
| 667 SchedulerStateMachine::Action action; | |
| 668 do { | |
| 669 action = state_machine_.NextAction(); | |
| 670 TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler"), | |
| 671 "SchedulerStateMachine", | |
| 672 "state", | |
| 673 AsValue()); | |
| 674 VLOG(2) << "Scheduler::ProcessScheduledActions: " | |
| 675 << SchedulerStateMachine::ActionToString(action) << " " | |
| 676 << state_machine_.GetStatesForDebugging(); | |
| 677 state_machine_.UpdateState(action); | |
| 678 base::AutoReset<SchedulerStateMachine::Action> | |
| 679 mark_inside_action(&inside_action_, action); | |
| 680 switch (action) { | |
| 681 case SchedulerStateMachine::ACTION_NONE: | |
| 682 break; | |
| 683 case SchedulerStateMachine::ACTION_ANIMATE: | |
| 684 client_->ScheduledActionAnimate(); | |
| 685 break; | |
| 686 case SchedulerStateMachine::ACTION_SEND_BEGIN_MAIN_FRAME: | |
| 687 client_->ScheduledActionSendBeginMainFrame(); | |
| 688 break; | |
| 689 case SchedulerStateMachine::ACTION_COMMIT: { | |
| 690 // TODO(robliao): Remove ScopedTracker below once crbug.com/461509 is | |
| 691 // fixed. | |
| 692 tracked_objects::ScopedTracker tracking_profile4( | |
| 693 FROM_HERE_WITH_EXPLICIT_FUNCTION( | |
| 694 "461509 Scheduler::ProcessScheduledActions4")); | |
| 695 client_->ScheduledActionCommit(); | |
| 696 break; | |
| 697 } | |
| 698 case SchedulerStateMachine::ACTION_ACTIVATE_SYNC_TREE: | |
| 699 client_->ScheduledActionActivateSyncTree(); | |
| 700 break; | |
| 701 case SchedulerStateMachine::ACTION_DRAW_AND_SWAP_IF_POSSIBLE: { | |
| 702 // TODO(robliao): Remove ScopedTracker below once crbug.com/461509 is | |
| 703 // fixed. | |
| 704 tracked_objects::ScopedTracker tracking_profile6( | |
| 705 FROM_HERE_WITH_EXPLICIT_FUNCTION( | |
| 706 "461509 Scheduler::ProcessScheduledActions6")); | |
| 707 DrawAndSwapIfPossible(); | |
| 708 break; | |
| 709 } | |
| 710 case SchedulerStateMachine::ACTION_DRAW_AND_SWAP_FORCED: | |
| 711 client_->ScheduledActionDrawAndSwapForced(); | |
| 712 break; | |
| 713 case SchedulerStateMachine::ACTION_DRAW_AND_SWAP_ABORT: | |
| 714 // No action is actually performed, but this allows the state machine to | |
| 715 // advance out of its waiting to draw state without actually drawing. | |
| 716 break; | |
| 717 case SchedulerStateMachine::ACTION_BEGIN_OUTPUT_SURFACE_CREATION: | |
| 718 client_->ScheduledActionBeginOutputSurfaceCreation(); | |
| 719 break; | |
| 720 case SchedulerStateMachine::ACTION_PREPARE_TILES: | |
| 721 client_->ScheduledActionPrepareTiles(); | |
| 722 break; | |
| 723 } | |
| 724 } while (action != SchedulerStateMachine::ACTION_NONE); | |
| 725 | |
| 726 SetupPollingMechanisms(); | |
| 727 | |
| 728 client_->DidAnticipatedDrawTimeChange(AnticipatedDrawTime()); | |
| 729 | |
| 730 RescheduleBeginImplFrameDeadlineIfNeeded(); | |
| 731 | |
| 732 SetupNextBeginFrameIfNeeded(); | |
| 733 } | |
| 734 | |
| 735 scoped_refptr<base::trace_event::ConvertableToTraceFormat> Scheduler::AsValue() | |
| 736 const { | |
| 737 scoped_refptr<base::trace_event::TracedValue> state = | |
| 738 new base::trace_event::TracedValue(); | |
| 739 AsValueInto(state.get()); | |
| 740 return state; | |
| 741 } | |
| 742 | |
| 743 void Scheduler::AsValueInto(base::trace_event::TracedValue* state) const { | |
| 744 state->BeginDictionary("state_machine"); | |
| 745 state_machine_.AsValueInto(state); | |
| 746 state->EndDictionary(); | |
| 747 | |
| 748 // Only trace frame sources when explicitly enabled - http://crbug.com/420607 | |
| 749 bool frame_tracing_enabled = false; | |
| 750 TRACE_EVENT_CATEGORY_GROUP_ENABLED( | |
| 751 TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.frames"), | |
| 752 &frame_tracing_enabled); | |
| 753 if (frame_tracing_enabled) { | |
| 754 state->BeginDictionary("frame_source_"); | |
| 755 frame_source_->AsValueInto(state); | |
| 756 state->EndDictionary(); | |
| 757 } | |
| 758 | |
| 759 state->BeginDictionary("scheduler_state"); | |
| 760 state->SetDouble("time_until_anticipated_draw_time_ms", | |
| 761 (AnticipatedDrawTime() - Now()).InMillisecondsF()); | |
| 762 state->SetDouble("estimated_parent_draw_time_ms", | |
| 763 estimated_parent_draw_time_.InMillisecondsF()); | |
| 764 state->SetBoolean("last_set_needs_begin_frame_", | |
| 765 frame_source_->NeedsBeginFrames()); | |
| 766 state->SetInteger("begin_retro_frame_args_", begin_retro_frame_args_.size()); | |
| 767 state->SetBoolean("begin_retro_frame_task_", | |
| 768 !begin_retro_frame_task_.IsCancelled()); | |
| 769 state->SetBoolean("begin_impl_frame_deadline_task_", | |
| 770 !begin_impl_frame_deadline_task_.IsCancelled()); | |
| 771 state->SetBoolean("poll_for_draw_triggers_task_", | |
| 772 !poll_for_draw_triggers_task_.IsCancelled()); | |
| 773 state->SetBoolean("advance_commit_state_task_", | |
| 774 !advance_commit_state_task_.IsCancelled()); | |
| 775 state->BeginDictionary("begin_impl_frame_args"); | |
| 776 begin_impl_frame_args_.AsValueInto(state); | |
| 777 state->EndDictionary(); | |
| 778 | |
| 779 base::TimeTicks now = Now(); | |
| 780 base::TimeTicks frame_time = begin_impl_frame_args_.frame_time; | |
| 781 base::TimeTicks deadline = begin_impl_frame_args_.deadline; | |
| 782 base::TimeDelta interval = begin_impl_frame_args_.interval; | |
| 783 state->BeginDictionary("major_timestamps_in_ms"); | |
| 784 state->SetDouble("0_interval", interval.InMillisecondsF()); | |
| 785 state->SetDouble("1_now_to_deadline", (deadline - now).InMillisecondsF()); | |
| 786 state->SetDouble("2_frame_time_to_now", (now - frame_time).InMillisecondsF()); | |
| 787 state->SetDouble("3_frame_time_to_deadline", | |
| 788 (deadline - frame_time).InMillisecondsF()); | |
| 789 state->SetDouble("4_now", (now - base::TimeTicks()).InMillisecondsF()); | |
| 790 state->SetDouble("5_frame_time", | |
| 791 (frame_time - base::TimeTicks()).InMillisecondsF()); | |
| 792 state->SetDouble("6_deadline", | |
| 793 (deadline - base::TimeTicks()).InMillisecondsF()); | |
| 794 state->EndDictionary(); | |
| 795 | |
| 796 state->EndDictionary(); | |
| 797 | |
| 798 state->BeginDictionary("client_state"); | |
| 799 state->SetDouble("draw_duration_estimate_ms", | |
| 800 client_->DrawDurationEstimate().InMillisecondsF()); | |
| 801 state->SetDouble( | |
| 802 "begin_main_frame_to_commit_duration_estimate_ms", | |
| 803 client_->BeginMainFrameToCommitDurationEstimate().InMillisecondsF()); | |
| 804 state->SetDouble( | |
| 805 "commit_to_activate_duration_estimate_ms", | |
| 806 client_->CommitToActivateDurationEstimate().InMillisecondsF()); | |
| 807 state->EndDictionary(); | |
| 808 } | |
| 809 | |
| 810 bool Scheduler::CanCommitAndActivateBeforeDeadline() const { | |
| 811 // Check if the main thread computation and commit can be finished before the | |
| 812 // impl thread's deadline. | |
| 813 base::TimeTicks estimated_draw_time = | |
| 814 begin_impl_frame_args_.frame_time + | |
| 815 client_->BeginMainFrameToCommitDurationEstimate() + | |
| 816 client_->CommitToActivateDurationEstimate(); | |
| 817 | |
| 818 TRACE_EVENT2( | |
| 819 TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler"), | |
| 820 "CanCommitAndActivateBeforeDeadline", | |
| 821 "time_left_after_drawing_ms", | |
| 822 (begin_impl_frame_args_.deadline - estimated_draw_time).InMillisecondsF(), | |
| 823 "state", | |
| 824 AsValue()); | |
| 825 | |
| 826 return estimated_draw_time < begin_impl_frame_args_.deadline; | |
| 827 } | |
| 828 | |
| 829 bool Scheduler::IsBeginMainFrameSentOrStarted() const { | |
| 830 return (state_machine_.commit_state() == | |
| 831 SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_SENT || | |
| 832 state_machine_.commit_state() == | |
| 833 SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_STARTED); | |
| 834 } | |
| 835 | |
| 836 } // namespace cc | |
| OLD | NEW |
|---|
Chromium Code Reviews
