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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/scheduler/compositor_timing_history.h"
#include "base/metrics/histogram.h"
#include "base/trace_event/trace_event.h"
#include "cc/debug/rendering_stats_instrumentation.h"
// The estimates that affect the compositors deadline use the 100th percentile
// to avoid missing the Browser's deadline.
// The estimates related to main-thread responsiveness affect whether
// we attempt to recovery latency or not and use the 50th percentile.
// TODO(brianderson): Fine tune the percentiles below.
const size_t kDurationHistorySize = 60;
const double kBeginMainFrameToCommitEstimationPercentile = 50.0;
const double kCommitToReadyToActivateEstimationPercentile = 50.0;
const double kPrepareTilesEstimationPercentile = 100.0;
const double kActivateEstimationPercentile = 100.0;
const double kDrawEstimationPercentile = 100.0;
namespace cc {
CompositorTimingHistory::CompositorTimingHistory(
RenderingStatsInstrumentation* rendering_stats_instrumentation)
: enabled_(false),
begin_main_frame_to_commit_duration_history_(kDurationHistorySize),
commit_to_ready_to_activate_duration_history_(kDurationHistorySize),
prepare_tiles_duration_history_(kDurationHistorySize),
activate_duration_history_(kDurationHistorySize),
draw_duration_history_(kDurationHistorySize),
rendering_stats_instrumentation_(rendering_stats_instrumentation) {
}
CompositorTimingHistory::~CompositorTimingHistory() {
}
void CompositorTimingHistory::AsValueInto(
base::trace_event::TracedValue* state) const {
state->SetDouble("begin_main_frame_to_commit_duration_estimate_ms",
BeginMainFrameToCommitDurationEstimate().InMillisecondsF());
state->SetDouble("commit_to_ready_to_activate_duration_estimate_ms",
CommitToReadyToActivateDurationEstimate().InMillisecondsF());
state->SetDouble("prepare_tiles_duration_estimate_ms",
PrepareTilesDurationEstimate().InMillisecondsF());
state->SetDouble("activate_duration_estimate_ms",
ActivateDurationEstimate().InMillisecondsF());
state->SetDouble("draw_duration_estimate_ms",
DrawDurationEstimate().InMillisecondsF());
}
base::TimeTicks CompositorTimingHistory::Now() const {
return base::TimeTicks::Now();
}
void CompositorTimingHistory::SetRecordingEnabled(bool enabled) {
enabled_ = enabled;
}
base::TimeDelta
CompositorTimingHistory::BeginMainFrameToCommitDurationEstimate() const {
return begin_main_frame_to_commit_duration_history_.Percentile(
kBeginMainFrameToCommitEstimationPercentile);
}
base::TimeDelta
CompositorTimingHistory::CommitToReadyToActivateDurationEstimate() const {
return commit_to_ready_to_activate_duration_history_.Percentile(
kCommitToReadyToActivateEstimationPercentile);
}
base::TimeDelta CompositorTimingHistory::PrepareTilesDurationEstimate() const {
return prepare_tiles_duration_history_.Percentile(
kPrepareTilesEstimationPercentile);
}
base::TimeDelta CompositorTimingHistory::ActivateDurationEstimate() const {
return activate_duration_history_.Percentile(kActivateEstimationPercentile);
}
base::TimeDelta CompositorTimingHistory::DrawDurationEstimate() const {
return draw_duration_history_.Percentile(kDrawEstimationPercentile);
}
void CompositorTimingHistory::WillBeginMainFrame() {
DCHECK_EQ(base::TimeTicks(), begin_main_frame_sent_time_);
begin_main_frame_sent_time_ = Now();
}
void CompositorTimingHistory::BeginMainFrameAborted() {
DidCommit();
}
void CompositorTimingHistory::DidCommit() {
DCHECK_NE(base::TimeTicks(), begin_main_frame_sent_time_);
commit_time_ = Now();
base::TimeDelta begin_main_frame_to_commit_duration =
commit_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());
if (enabled_) {
begin_main_frame_to_commit_duration_history_.InsertSample(
begin_main_frame_to_commit_duration);
}
begin_main_frame_sent_time_ = base::TimeTicks();
}
void CompositorTimingHistory::WillPrepareTiles() {
DCHECK_EQ(base::TimeTicks(), start_prepare_tiles_time_);
start_prepare_tiles_time_ = Now();
}
void CompositorTimingHistory::DidPrepareTiles() {
DCHECK_NE(base::TimeTicks(), start_prepare_tiles_time_);
if (enabled_) {
base::TimeDelta prepare_tiles_duration = Now() - start_prepare_tiles_time_;
prepare_tiles_duration_history_.InsertSample(prepare_tiles_duration);
}
start_prepare_tiles_time_ = base::TimeTicks();
}
void CompositorTimingHistory::ReadyToActivate() {
// We only care about the first ready to activate signal
// after a commit.
if (commit_time_ == base::TimeTicks())
return;
base::TimeDelta time_since_commit = Now() - commit_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(
time_since_commit, CommitToReadyToActivateDurationEstimate());
if (enabled_) {
commit_to_ready_to_activate_duration_history_.InsertSample(
time_since_commit);
}
commit_time_ = base::TimeTicks();
}
void CompositorTimingHistory::WillActivate() {
DCHECK_EQ(base::TimeTicks(), start_activate_time_);
start_activate_time_ = Now();
}
void CompositorTimingHistory::DidActivate() {
DCHECK_NE(base::TimeTicks(), start_activate_time_);
if (enabled_) {
base::TimeDelta activate_duration = Now() - start_activate_time_;
activate_duration_history_.InsertSample(activate_duration);
}
start_activate_time_ = base::TimeTicks();
}
void CompositorTimingHistory::WillDraw() {
DCHECK_EQ(base::TimeTicks(), start_draw_time_);
start_draw_time_ = Now();
}
void CompositorTimingHistory::DidDraw() {
DCHECK_NE(base::TimeTicks(), start_draw_time_);
base::TimeDelta draw_duration = Now() - 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);
if (enabled_) {
draw_duration_history_.InsertSample(draw_duration);
}
start_draw_time_ = base::TimeTicks();
}
void CompositorTimingHistory::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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