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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.
#ifndef CHROME_BROWSER_MEMORY_OOM_KILLS_MONITOR_H_
#define CHROME_BROWSER_MEMORY_OOM_KILLS_MONITOR_H_
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/no_destructor.h"
#include "base/synchronization/atomic_flag.h"
#include "base/timer/timer.h"
#include "components/metrics/daily_event.h"
class PrefService;
namespace memory {
// Traces Linux Out-of-memory killer invocation count. It checks the oom_kill
// field in /proc/vmstat periodically.
class OOMKillsMonitor {
public:
OOMKillsMonitor(const OOMKillsMonitor&) = delete;
OOMKillsMonitor& operator=(const OOMKillsMonitor&) = delete;
~OOMKillsMonitor();
static OOMKillsMonitor& GetInstance();
static void RegisterPrefs(PrefRegistrySimple* registry);
void Initialize(PrefService* pref_service);
void LogArcOOMKill(unsigned long current_oom_kills);
// The following items are public for testing.
// Difference for the following 2 histograms: OOMKillsCount logs the
// cumulative OOM kills count since browser start on every OOM kills,
// OOMKillsDaily is the total OOM kills count in a day. E.g., if there are 100
// OOM kills in a day, OOMKillsCount logs 1 to the 0, 1, 2, 3, ...., 100
// buckets, and OOMKillsDaily logs 1 to the 100 bucket.
// OOM kills count histogram name.
static const char kOOMKillsCountHistogramName[];
// Daily OOM kills histogram name.
static const char kOOMKillsDailyHistogramName[];
// Stops timers to avoid unexpected timer fire in test.
void StopTimersForTesting();
// Trigger daily event manually for testing.
void TriggerDailyEventForTesting();
private:
FRIEND_TEST_ALL_PREFIXES(OOMKillsMonitorTest, TestHistograms);
friend class base::NoDestructor<OOMKillsMonitor>;
class DailyEventObserver;
OOMKillsMonitor();
// Checks system OOM count.
void CheckOOMKill();
// Splits CheckOOMKill and CheckOOMKillImpl for testing.
void CheckOOMKillImpl(unsigned long current_oom_kills);
// Reports OOM Kills to histogram.
void ReportOOMKills(unsigned long oom_kills_delta);
void ReportDailyMetrics(metrics::DailyEvent::IntervalType type);
// Member variables.
// The number of OOM kills since monitoring is started.
unsigned long oom_kills_count_ = 0;
// The number of OOM kills per day.
unsigned long oom_kills_daily_count_ = 0;
// A flag set when Initialize() is called to indicate that monitoring has
// been started.
bool monitoring_started_ = false;
// The last oom kills count.
unsigned long last_oom_kills_count_ = 0;
// The last ARCVM OOM kills count.
unsigned long last_arc_oom_kills_count_ = 0;
base::RepeatingTimer checking_timer_;
std::unique_ptr<metrics::DailyEvent> daily_event_;
// Instructs |daily_event_| to check if a day has passed.
base::RepeatingTimer daily_event_timer_;
// The name of the histogram used to report that the daily event happened.
static const char kDailyEventHistogramName[];
// A raw pointer to the PrefService used to read and write the statistics.
raw_ptr<PrefService, LeakedDanglingUntriaged> pref_service_;
};
} // namespace memory
#endif // CHROME_BROWSER_MEMORY_OOM_KILLS_MONITOR_H_
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