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// Copyright 2015 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_TASK_MANAGER_SAMPLING_TASK_GROUP_SAMPLER_H_
#define CHROME_BROWSER_TASK_MANAGER_SAMPLING_TASK_GROUP_SAMPLER_H_
#include <stdint.h>
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/ref_counted.h"
#include "base/process/process.h"
#include "base/process/process_handle.h"
#include "base/process/process_metrics.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "build/build_config.h"
namespace task_manager {
// Defines the expensive process' stats sampler that will calculate these
// resources on the worker thread. Objects of this class are created by the
// TaskGroups on the UI thread, however it will be used mainly on a blocking
// pool thread.
class TaskGroupSampler : public base::RefCountedThreadSafe<TaskGroupSampler> {
public:
// Below are the types of callbacks that are invoked on the UI thread upon
// completion of corresponding refresh tasks on the worker thread.
using OnCpuRefreshCallback = base::RepeatingCallback<void(double)>;
using OnSwappedMemRefreshCallback = base::RepeatingCallback<void(int64_t)>;
using OnIdleWakeupsCallback = base::RepeatingCallback<void(int)>;
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
using OnOpenFdCountCallback = base::RepeatingCallback<void(int)>;
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
using OnProcessPriorityCallback =
base::RepeatingCallback<void(base::Process::Priority)>;
TaskGroupSampler(
base::Process process,
const scoped_refptr<base::SequencedTaskRunner>& blocking_pool_runner,
const OnCpuRefreshCallback& on_cpu_refresh,
const OnSwappedMemRefreshCallback& on_memory_refresh,
const OnIdleWakeupsCallback& on_idle_wakeups,
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
const OnOpenFdCountCallback& on_open_fd_count,
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
const OnProcessPriorityCallback& on_process_priority);
TaskGroupSampler(const TaskGroupSampler&) = delete;
TaskGroupSampler& operator=(const TaskGroupSampler&) = delete;
// Refreshes the expensive process' stats (CPU usage, memory usage, and idle
// wakeups per second) on the worker thread.
void Refresh(int64_t refresh_flags);
private:
friend class base::RefCountedThreadSafe<TaskGroupSampler>;
~TaskGroupSampler();
// The refresh calls that will be done on the worker thread.
double RefreshCpuUsage();
int64_t RefreshSwappedMem();
int RefreshIdleWakeupsPerSecond();
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
int RefreshOpenFdCount();
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
base::Process::Priority RefreshProcessPriority();
// The process that holds the handle that we own so that we can use it for
// creating the ProcessMetrics.
base::Process process_;
std::unique_ptr<base::ProcessMetrics> process_metrics_;
// Keep track of whether or not we have real cpu usage. First call to
// GetPlatformIndependentCPUUsage returns 0, which we treat as NaN.
bool cpu_usage_calculated_ = false;
// The specific blocking pool SequencedTaskRunner that will be used to post
// the refresh tasks onto serially.
scoped_refptr<base::SequencedTaskRunner> blocking_pool_runner_;
// The UI-thread callbacks in TaskGroup to be called when their corresponding
// refreshes on the worker thread are done.
const OnCpuRefreshCallback on_cpu_refresh_callback_;
const OnSwappedMemRefreshCallback on_swapped_mem_refresh_callback_;
const OnIdleWakeupsCallback on_idle_wakeups_callback_;
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
const OnOpenFdCountCallback on_open_fd_count_callback_;
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC)
const OnProcessPriorityCallback on_process_priority_callback_;
// To assert we're running on the correct thread.
SEQUENCE_CHECKER(worker_pool_sequenced_checker_);
};
} // namespace task_manager
#endif // CHROME_BROWSER_TASK_MANAGER_SAMPLING_TASK_GROUP_SAMPLER_H_
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