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// Copyright 2022 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/memory/oom_kills_monitor.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
#include "base/metrics/statistics_recorder.h"
#include "components/prefs/testing_pref_service.h"
#include "content/public/test/browser_task_environment.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace memory {
namespace {
base::HistogramBase* GetOOMKillsCountHistogram() {
return base::StatisticsRecorder::FindHistogram(
OOMKillsMonitor::kOOMKillsCountHistogramName);
}
base::HistogramBase* GetOOMKillsDailyHistogram() {
return base::StatisticsRecorder::FindHistogram(
OOMKillsMonitor::kOOMKillsDailyHistogramName);
}
} // namespace.
class OOMKillsMonitorTest : public testing::Test {
public:
OOMKillsMonitorTest() {
OOMKillsMonitor::RegisterPrefs(pref_service_.registry());
}
TestingPrefServiceSimple pref_service_;
private:
content::BrowserTaskEnvironment task_environment_;
};
TEST_F(OOMKillsMonitorTest, TestHistograms) {
std::unique_ptr<base::StatisticsRecorder> statistic_recorder(
base::StatisticsRecorder::CreateTemporaryForTesting());
OOMKillsMonitor& monitor_instance = OOMKillsMonitor::GetInstance();
auto* oom_count_histogram = GetOOMKillsCountHistogram();
auto* oom_daily_histogram = GetOOMKillsDailyHistogram();
// Before StartMonitoring() is called, nothing is recorded.
ASSERT_FALSE(oom_count_histogram);
ASSERT_FALSE(oom_daily_histogram);
// Start monitoring.
monitor_instance.Initialize(&pref_service_);
monitor_instance.StopTimersForTesting();
oom_count_histogram = GetOOMKillsCountHistogram();
ASSERT_TRUE(oom_count_histogram);
{
auto count_samples = oom_count_histogram->SnapshotSamples();
EXPECT_EQ(1, count_samples->TotalCount());
EXPECT_EQ(1, count_samples->GetCount(0));
}
// OOM kills.
// Simulate getting 3 more oom kills.
monitor_instance.CheckOOMKillImpl(monitor_instance.last_oom_kills_count_ + 3);
oom_count_histogram = GetOOMKillsCountHistogram();
ASSERT_TRUE(oom_count_histogram);
{
auto count_samples = oom_count_histogram->SnapshotSamples();
EXPECT_EQ(4, count_samples->TotalCount());
// The zero count is implicitly added when StartMonitoring() is called.
EXPECT_EQ(1, count_samples->GetCount(0));
EXPECT_EQ(1, count_samples->GetCount(1));
EXPECT_EQ(1, count_samples->GetCount(2));
EXPECT_EQ(1, count_samples->GetCount(3));
}
// Simulate 2 ARCVM oom kills.
monitor_instance.LogArcOOMKill(2);
oom_count_histogram = GetOOMKillsCountHistogram();
ASSERT_TRUE(oom_count_histogram);
{
auto count_samples = oom_count_histogram->SnapshotSamples();
EXPECT_EQ(6, count_samples->TotalCount());
EXPECT_EQ(1, count_samples->GetCount(0));
EXPECT_EQ(1, count_samples->GetCount(1));
EXPECT_EQ(1, count_samples->GetCount(2));
EXPECT_EQ(1, count_samples->GetCount(3));
EXPECT_EQ(1, count_samples->GetCount(4));
EXPECT_EQ(1, count_samples->GetCount(5));
}
oom_count_histogram = GetOOMKillsCountHistogram();
ASSERT_TRUE(oom_count_histogram);
{
auto count_samples = oom_count_histogram->SnapshotSamples();
// Ensure zero count is not increased.
EXPECT_EQ(1, count_samples->GetCount(0));
}
// Test daily OOM kills metrics.
monitor_instance.TriggerDailyEventForTesting();
oom_daily_histogram = GetOOMKillsDailyHistogram();
{
auto daily_samples = oom_daily_histogram->SnapshotSamples();
EXPECT_EQ(1, daily_samples->TotalCount());
EXPECT_EQ(1, daily_samples->GetCount(5));
}
// Simulate getting 4 more oom kills.
monitor_instance.CheckOOMKillImpl(monitor_instance.last_oom_kills_count_ + 4);
monitor_instance.TriggerDailyEventForTesting();
oom_daily_histogram = GetOOMKillsDailyHistogram();
{
auto daily_samples = oom_daily_histogram->SnapshotSamples();
EXPECT_EQ(2, daily_samples->TotalCount());
EXPECT_EQ(1, daily_samples->GetCount(4));
EXPECT_EQ(1, daily_samples->GetCount(5));
}
}
} // namespace memory
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