| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cc/trees/proxy_timing_history.h" |
| |
| #include "base/metrics/histogram.h" |
| |
| const size_t kDurationHistorySize = 60; |
| const double kCommitAndActivationDurationEstimationPercentile = 50.0; |
| const double kDrawDurationEstimationPercentile = 100.0; |
| const int kDrawDurationEstimatePaddingInMicroseconds = 0; |
| |
| namespace cc { |
| |
| ProxyTimingHistory::ProxyTimingHistory( |
| RenderingStatsInstrumentation* rendering_stats_instrumentation) |
| : draw_duration_history_(kDurationHistorySize), |
| begin_main_frame_to_commit_duration_history_(kDurationHistorySize), |
| commit_to_activate_duration_history_(kDurationHistorySize), |
| rendering_stats_instrumentation_(rendering_stats_instrumentation) { |
| } |
| |
| ProxyTimingHistory::~ProxyTimingHistory() {} |
| |
| base::TimeDelta ProxyTimingHistory::DrawDurationEstimate() const { |
| base::TimeDelta historical_estimate = |
| draw_duration_history_.Percentile(kDrawDurationEstimationPercentile); |
| base::TimeDelta padding = base::TimeDelta::FromMicroseconds( |
| kDrawDurationEstimatePaddingInMicroseconds); |
| return historical_estimate + padding; |
| } |
| |
| base::TimeDelta ProxyTimingHistory::BeginMainFrameToCommitDurationEstimate() |
| const { |
| return begin_main_frame_to_commit_duration_history_.Percentile( |
| kCommitAndActivationDurationEstimationPercentile); |
| } |
| |
| base::TimeDelta ProxyTimingHistory::CommitToActivateDurationEstimate() const { |
| return commit_to_activate_duration_history_.Percentile( |
| kCommitAndActivationDurationEstimationPercentile); |
| } |
| |
| void ProxyTimingHistory::DidBeginMainFrame() { |
| begin_main_frame_sent_time_ = base::TimeTicks::HighResNow(); |
| } |
| |
| void ProxyTimingHistory::DidCommit() { |
| commit_complete_time_ = base::TimeTicks::HighResNow(); |
| base::TimeDelta begin_main_frame_to_commit_duration = |
| commit_complete_time_ - begin_main_frame_sent_time_; |
| |
| // Before adding the new data point to the timing history, see what we would |
| // have predicted for this frame. This allows us to keep track of the accuracy |
| // of our predictions. |
| rendering_stats_instrumentation_->AddBeginMainFrameToCommitDuration( |
| begin_main_frame_to_commit_duration, |
| BeginMainFrameToCommitDurationEstimate()); |
| |
| begin_main_frame_to_commit_duration_history_.InsertSample( |
| begin_main_frame_to_commit_duration); |
| } |
| |
| void ProxyTimingHistory::DidActivateSyncTree() { |
| base::TimeDelta commit_to_activate_duration = |
| base::TimeTicks::HighResNow() - commit_complete_time_; |
| |
| // Before adding the new data point to the timing history, see what we would |
| // have predicted for this frame. This allows us to keep track of the accuracy |
| // of our predictions. |
| rendering_stats_instrumentation_->AddCommitToActivateDuration( |
| commit_to_activate_duration, CommitToActivateDurationEstimate()); |
| |
| commit_to_activate_duration_history_.InsertSample( |
| commit_to_activate_duration); |
| } |
| |
| void ProxyTimingHistory::DidStartDrawing() { |
| start_draw_time_ = base::TimeTicks::HighResNow(); |
| } |
| |
| void ProxyTimingHistory::DidFinishDrawing() { |
| base::TimeDelta draw_duration = |
| base::TimeTicks::HighResNow() - start_draw_time_; |
| |
| // Before adding the new data point to the timing history, see what we would |
| // have predicted for this frame. This allows us to keep track of the accuracy |
| // of our predictions. |
| base::TimeDelta draw_duration_estimate = DrawDurationEstimate(); |
| rendering_stats_instrumentation_->AddDrawDuration(draw_duration, |
| draw_duration_estimate); |
| |
| AddDrawDurationUMA(draw_duration, draw_duration_estimate); |
| |
| draw_duration_history_.InsertSample(draw_duration); |
| } |
| |
| void ProxyTimingHistory::AddDrawDurationUMA( |
| base::TimeDelta draw_duration, |
| base::TimeDelta draw_duration_estimate) { |
| base::TimeDelta draw_duration_overestimate; |
| base::TimeDelta draw_duration_underestimate; |
| if (draw_duration > draw_duration_estimate) |
| draw_duration_underestimate = draw_duration - draw_duration_estimate; |
| else |
| draw_duration_overestimate = draw_duration_estimate - draw_duration; |
| UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDuration", |
| draw_duration, |
| base::TimeDelta::FromMilliseconds(1), |
| base::TimeDelta::FromMilliseconds(100), |
| 50); |
| UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDurationUnderestimate", |
| draw_duration_underestimate, |
| base::TimeDelta::FromMilliseconds(1), |
| base::TimeDelta::FromMilliseconds(100), |
| 50); |
| UMA_HISTOGRAM_CUSTOM_TIMES("Renderer.DrawDurationOverestimate", |
| draw_duration_overestimate, |
| base::TimeDelta::FromMilliseconds(1), |
| base::TimeDelta::FromMilliseconds(100), |
| 50); |
| } |
| |
| } // namespace cc |