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// Copyright (c) 2012 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 <map>
#include <memory>
#include <vector>
#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/process/process_handle.h"
#include "base/timer/timer.h"
#include "chrome/browser/performance_monitor/process_metrics_history.h"
namespace performance_monitor {
class ProcessMetricsHistory;
// ProcessMonitor is a tool which periodically monitors performance metrics
// of all the Chrome processes for histogram logging and possibly taking action
// upon noticing serious performance degradation.
// TODO(sebmarchand): Make this class not a singleton.
class ProcessMonitor {
// Returns the current ProcessMonitor instance if one exists; otherwise
// constructs a new ProcessMonitor.
static ProcessMonitor* GetInstance();
// Start the cycle of metrics gathering.
void StartGatherCycle();
friend struct base::LazyInstanceTraitsBase<ProcessMonitor>;
using MetricsMap =
std::map<base::ProcessHandle, std::unique_ptr<ProcessMetricsHistory>>;
// Perform any collections that are done on a timed basis.
void DoTimedCollections();
// Mark the given process as alive in the current update iteration.
// This means adding an entry to the map of watched processes if it's not
// already present.
void MarkProcessAsAlive(const ProcessMetricsMetadata& process_data,
int current_update_sequence);
void MarkProcessesAsAliveOnUIThread(
std::unique_ptr<std::vector<ProcessMetricsMetadata>> process_data_list,
int current_update_sequence);
// Updates the ProcessMetrics map with the current list of processes and
// gathers metrics from each entry.
void GatherMetricsMapOnUIThread();
void GatherMetricsMapOnIOThread(int current_update_sequence);
void UpdateMetricsOnIOThread(int current_update_sequence);
void RunTriggersUIThread();
// A map of currently running ProcessHandles to ProcessMetrics.
MetricsMap metrics_map_;
// The timer to signal ProcessMonitor to perform its timed collections.
base::OneShotTimer repeating_timer_;
} // namespace performance_monitor