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| 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/scheduler/begin_frame_tracker.h" | |
| 6 | |
| 7 namespace cc { | |
| 8 | |
| 9 BeginFrameTracker::BeginFrameTracker(const tracked_objects::Location& location) | |
| 10 : location_(location), | |
| 11 location_string_(location.ToString()), | |
| 12 current_updated_at_(), | |
| 13 current_args_(), | |
| 14 current_finished_at_(base::TimeTicks::FromInternalValue(-1)) { | |
| 15 } | |
| 16 | |
| 17 BeginFrameTracker::~BeginFrameTracker() { | |
| 18 } | |
| 19 | |
| 20 void BeginFrameTracker::Start(BeginFrameArgs new_args) { | |
| 21 // Trace the frame time being passed between BeginFrameTrackers. | |
| 22 TRACE_EVENT_FLOW_STEP0( | |
| 23 TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.frames"), "BeginFrameArgs", | |
| 24 new_args.frame_time.ToInternalValue(), location_string_); | |
| 25 | |
| 26 // Trace this specific begin frame tracker Start/Finish times. | |
| 27 TRACE_EVENT_ASYNC_BEGIN2( | |
| 28 TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.frames"), | |
| 29 location_string_.c_str(), new_args.frame_time.ToInternalValue(), | |
| 30 "new args", new_args.AsValue(), "current args", current_args_.AsValue()); | |
| 31 | |
| 32 // Check the new BeginFrameArgs are valid and monotonically increasing. | |
| 33 DCHECK(new_args.IsValid()); | |
| 34 DCHECK_LE(current_args_.frame_time, new_args.frame_time); | |
| 35 | |
| 36 DCHECK(HasFinished()) | |
| 37 << "Tried to start a new frame before finishing an existing frame."; | |
| 38 current_updated_at_ = base::TimeTicks::NowFromSystemTraceTime(); | |
| 39 current_args_ = new_args; | |
| 40 current_finished_at_ = base::TimeTicks(); | |
| 41 | |
| 42 // TODO(mithro): Add UMA tracking of delta between current_updated_at_ time | |
| 43 // and the new_args.frame_time argument. This will give us how long after a | |
| 44 // BeginFrameArgs message was created before we started processing it. | |
| 45 } | |
| 46 | |
| 47 const BeginFrameArgs& BeginFrameTracker::Current() const { | |
| 48 DCHECK(!HasFinished()) | |
| 49 << "Tried to use BeginFrameArgs after marking the frame finished."; | |
| 50 DCHECK(current_args_.IsValid()) | |
| 51 << "Tried to use BeginFrameArgs before starting a frame!"; | |
| 52 return current_args_; | |
| 53 } | |
| 54 | |
| 55 void BeginFrameTracker::Finish() { | |
| 56 DCHECK(!HasFinished()) << "Tried to finish an already finished frame"; | |
| 57 current_finished_at_ = base::TimeTicks::NowFromSystemTraceTime(); | |
| 58 TRACE_EVENT_ASYNC_END0(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.frames"), | |
| 59 location_string_.c_str(), | |
| 60 current_args_.frame_time.ToInternalValue()); | |
| 61 } | |
| 62 | |
| 63 const BeginFrameArgs& BeginFrameTracker::Last() const { | |
| 64 DCHECK(current_args_.IsValid()) | |
| 65 << "Tried to use last BeginFrameArgs before starting a frame!"; | |
| 66 DCHECK(HasFinished()) | |
| 67 << "Tried to use last BeginFrameArgs before the frame is finished."; | |
| 68 return current_args_; | |
| 69 } | |
| 70 | |
| 71 base::TimeDelta BeginFrameTracker::Interval() const { | |
| 72 base::TimeDelta interval = current_args_.interval; | |
| 73 // Normal interval will be ~16ms, 200Hz (5ms) screens are the fastest | |
| 74 // easily available so anything less than that is likely an error. | |
| 75 if (interval < base::TimeDelta::FromMilliseconds(1)) { | |
| 76 interval = BeginFrameArgs::DefaultInterval(); | |
| 77 } | |
| 78 return interval; | |
| 79 } | |
| 80 | |
| 81 void BeginFrameTracker::AsValueInto( | |
| 82 base::TimeTicks now, | |
| 83 base::trace_event::TracedValue* state) const { | |
| 84 state->SetInteger("updated_at_us", current_updated_at_.ToInternalValue()); | |
| 85 state->SetInteger("finished_at_us", current_finished_at_.ToInternalValue()); | |
| 86 if (HasFinished()) { | |
| 87 state->SetString("state", "FINISHED"); | |
| 88 state->BeginDictionary("current_args_"); | |
| 89 } else { | |
| 90 state->SetString("state", "USING"); | |
| 91 state->BeginDictionary("last_args_"); | |
| 92 } | |
| 93 current_args_.AsValueInto(state); | |
| 94 state->EndDictionary(); | |
| 95 | |
| 96 base::TimeTicks frame_time = current_args_.frame_time; | |
| 97 base::TimeTicks deadline = current_args_.deadline; | |
| 98 base::TimeDelta interval = current_args_.interval; | |
| 99 state->BeginDictionary("major_timestamps_in_ms"); | |
| 100 state->SetDouble("0_interval", interval.InMillisecondsF()); | |
| 101 state->SetDouble("1_now_to_deadline", (deadline - now).InMillisecondsF()); | |
| 102 state->SetDouble("2_frame_time_to_now", (now - frame_time).InMillisecondsF()); | |
| 103 state->SetDouble("3_frame_time_to_deadline", | |
| 104 (deadline - frame_time).InMillisecondsF()); | |
| 105 state->SetDouble("4_now", (now - base::TimeTicks()).InMillisecondsF()); | |
| 106 state->SetDouble("5_frame_time", | |
| 107 (frame_time - base::TimeTicks()).InMillisecondsF()); | |
| 108 state->SetDouble("6_deadline", | |
| 109 (deadline - base::TimeTicks()).InMillisecondsF()); | |
| 110 state->EndDictionary(); | |
| 111 } | |
| 112 | |
| 113 const BeginFrameArgs& BeginFrameTracker::DangerousMethodCurrentOrLast() const { | |
| 114 if (!HasFinished()) { | |
| 115 return Current(); | |
| 116 } else { | |
| 117 return Last(); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 } // namespace cc | |
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Chromium Code Reviews
Issue 1127313003:
Revert of cc: Adding BeginFrameTracker object and removing Now() from LTHI. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master