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/trees/proxy_timing_history.h"
6
7#include "base/metrics/histogram.h"
8
9const size_t kDurationHistorySize = 60;
10const double kCommitAndActivationDurationEstimationPercentile = 50.0;
11const double kDrawDurationEstimationPercentile = 100.0;
12const int kDrawDurationEstimatePaddingInMicroseconds = 0;
13
14namespace cc {
15
16ProxyTimingHistory::ProxyTimingHistory(
17    RenderingStatsInstrumentation* rendering_stats_instrumentation)
18    : draw_duration_history_(kDurationHistorySize),
19      begin_main_frame_to_commit_duration_history_(kDurationHistorySize),
20      commit_to_activate_duration_history_(kDurationHistorySize),
21      rendering_stats_instrumentation_(rendering_stats_instrumentation) {
22}
23
24ProxyTimingHistory::~ProxyTimingHistory() {}
25
26base::TimeDelta ProxyTimingHistory::DrawDurationEstimate() const {
27  base::TimeDelta historical_estimate =
28      draw_duration_history_.Percentile(kDrawDurationEstimationPercentile);
29  base::TimeDelta padding = base::TimeDelta::FromMicroseconds(
30      kDrawDurationEstimatePaddingInMicroseconds);
31  return historical_estimate + padding;
32}
33
34base::TimeDelta ProxyTimingHistory::BeginMainFrameToCommitDurationEstimate()
35    const {
36  return begin_main_frame_to_commit_duration_history_.Percentile(
37      kCommitAndActivationDurationEstimationPercentile);
38}
39
40base::TimeDelta ProxyTimingHistory::CommitToActivateDurationEstimate() const {
41  return commit_to_activate_duration_history_.Percentile(
42      kCommitAndActivationDurationEstimationPercentile);
43}
44
45void ProxyTimingHistory::DidBeginMainFrame() {
46  begin_main_frame_sent_time_ = base::TimeTicks::HighResNow();
47}
48
49void ProxyTimingHistory::DidCommit() {
50  commit_complete_time_ = base::TimeTicks::HighResNow();
51  base::TimeDelta begin_main_frame_to_commit_duration =
52      commit_complete_time_ - begin_main_frame_sent_time_;
53
54  // Before adding the new data point to the timing history, see what we would
55  // have predicted for this frame. This allows us to keep track of the accuracy
56  // of our predictions.
57  rendering_stats_instrumentation_->AddBeginMainFrameToCommitDuration(
58      begin_main_frame_to_commit_duration,
59      BeginMainFrameToCommitDurationEstimate());
60
61  begin_main_frame_to_commit_duration_history_.InsertSample(
62      begin_main_frame_to_commit_duration);
63}
64
65void ProxyTimingHistory::DidActivateSyncTree() {
66  base::TimeDelta commit_to_activate_duration =
67      base::TimeTicks::HighResNow() - commit_complete_time_;
68
69  // Before adding the new data point to the timing history, see what we would
70  // have predicted for this frame. This allows us to keep track of the accuracy
71  // of our predictions.
72  rendering_stats_instrumentation_->AddCommitToActivateDuration(
73      commit_to_activate_duration, CommitToActivateDurationEstimate());
74
75  commit_to_activate_duration_history_.InsertSample(
76      commit_to_activate_duration);
77}
78
79void ProxyTimingHistory::DidStartDrawing() {
80  start_draw_time_ = base::TimeTicks::HighResNow();
81}
82
83void ProxyTimingHistory::DidFinishDrawing() {
84  base::TimeDelta draw_duration =
85      base::TimeTicks::HighResNow() - start_draw_time_;
86
87  // Before adding the new data point to the timing history, see what we would
88  // have predicted for this frame. This allows us to keep track of the accuracy
89  // of our predictions.
90  base::TimeDelta draw_duration_estimate = DrawDurationEstimate();
91  rendering_stats_instrumentation_->AddDrawDuration(draw_duration,
92                                                    draw_duration_estimate);
93
94  AddDrawDurationUMA(draw_duration, draw_duration_estimate);
95
96  draw_duration_history_.InsertSample(draw_duration);
97}
98
99void ProxyTimingHistory::AddDrawDurationUMA(
100    base::TimeDelta draw_duration,
101    base::TimeDelta draw_duration_estimate) {
102  base::TimeDelta draw_duration_overestimate;
103  base::TimeDelta draw_duration_underestimate;
104  if (draw_duration > draw_duration_estimate)
105    draw_duration_underestimate = draw_duration - draw_duration_estimate;
106  else
107    draw_duration_overestimate = draw_duration_estimate - draw_duration;
108  UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDuration",
109                             draw_duration,
110                             base::TimeDelta::FromMilliseconds(1),
111                             base::TimeDelta::FromMilliseconds(100),
112                             50);
113  UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDurationUnderestimate",
114                             draw_duration_underestimate,
115                             base::TimeDelta::FromMilliseconds(1),
116                             base::TimeDelta::FromMilliseconds(100),
117                             50);
118  UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDurationOverestimate",
119                             draw_duration_overestimate,
120                             base::TimeDelta::FromMilliseconds(1),
121                             base::TimeDelta::FromMilliseconds(100),
122                             50);
123}
124
125}  // namespace cc
126