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// 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
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