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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/arc/tracing/arc_graphics_jank_detector.h"
#include "base/functional/bind.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace arc {
using ArcGraphicsJankDetectorTest = testing::Test;
TEST_F(ArcGraphicsJankDetectorTest, Generic) {
int jank_count = 0;
ArcGraphicsJankDetector detector(base::BindRepeating(
[](int* out_jank_count, base::Time timestamp) { *out_jank_count += 1; },
&jank_count));
base::Time now = base::Time::Now();
const base::TimeDelta interval_fast =
ArcGraphicsJankDetector::kPauseDetectionThreshold / 6;
const base::TimeDelta interval_normal =
ArcGraphicsJankDetector::kPauseDetectionThreshold / 4;
const base::TimeDelta interval_slow =
ArcGraphicsJankDetector::kPauseDetectionThreshold / 2;
EXPECT_EQ(0, jank_count);
for (int i = 0; i < ArcGraphicsJankDetector::kWarmUpSamples; ++i) {
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kWarmUp, detector.stage());
now += interval_normal;
detector.OnSample(now);
}
EXPECT_EQ(0, jank_count);
for (size_t i = 0; i < ArcGraphicsJankDetector::kSamplesForRateDetection;
++i) {
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kRateDetection, detector.stage());
if (i < ArcGraphicsJankDetector::kSamplesForRateDetection / 4) {
// Slow samples.
now += interval_slow;
} else if (i < ArcGraphicsJankDetector::kSamplesForRateDetection / 2) {
// Fast samples.
now += interval_fast;
} else {
// Normal samples.
now += interval_normal;
}
detector.OnSample(now);
}
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
// Prevailing period should be returned.
EXPECT_EQ(interval_normal, detector.period());
EXPECT_EQ(0, jank_count);
now += interval_normal;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(0, jank_count);
now += interval_fast;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(0, jank_count);
// Simulate jank
now += interval_slow;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(1, jank_count);
now += interval_normal;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(1, jank_count);
// Simulate pause, detector should switch to warm-up stage, no jank detection
// should be reported.
now += ArcGraphicsJankDetector::kPauseDetectionThreshold;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kWarmUp, detector.stage());
EXPECT_EQ(1, jank_count);
}
TEST_F(ArcGraphicsJankDetectorTest, FixedRate) {
int jank_count = 0;
ArcGraphicsJankDetector detector(base::BindRepeating(
[](int* out_jank_count, base::Time timestamp) { *out_jank_count += 1; },
&jank_count));
base::Time now = base::Time::Now();
const base::TimeDelta period =
ArcGraphicsJankDetector::kPauseDetectionThreshold / 4;
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kWarmUp, detector.stage());
// Detector with fixed period is always in active state.
detector.SetPeriodFixed(period);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(0, jank_count);
detector.OnSample(now);
now += period;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(0, jank_count);
// Simulate jank.
now += period * 2;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(1, jank_count);
// Long intervals do not cause jank triggering and detector stays in active
// state.
now += ArcGraphicsJankDetector::kPauseDetectionThreshold;
detector.OnSample(now);
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
EXPECT_EQ(1, jank_count);
}
TEST_F(ArcGraphicsJankDetectorTest, CheckEnoughSamples) {
ArcGraphicsJankDetector detector(
base::BindRepeating([](base::Time timestamp) {
// Do nothing.
}));
base::Time now = base::Time::Now();
const base::TimeDelta interval_normal =
ArcGraphicsJankDetector::kPauseDetectionThreshold / 4;
std::vector<base::Time> samples;
for (int i = 0; i < ArcGraphicsJankDetector::kWarmUpSamples; ++i) {
samples.emplace_back(now);
now += interval_normal;
}
EXPECT_EQ(ArcGraphicsJankDetector::IsEnoughSamplesToDetect(samples.size()),
false);
for (size_t i = 0; i < ArcGraphicsJankDetector::kSamplesForRateDetection;
++i) {
samples.emplace_back(now);
now += interval_normal;
}
EXPECT_EQ(ArcGraphicsJankDetector::IsEnoughSamplesToDetect(samples.size()),
true);
for (const auto& sample : samples) {
detector.OnSample(sample);
}
EXPECT_EQ(ArcGraphicsJankDetector::Stage::kActive, detector.stage());
}
} // namespace arc
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