1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_COMMON_ANDROID_CPU_TIME_METRICS_INTERNAL_H_
#define CONTENT_COMMON_ANDROID_CPU_TIME_METRICS_INTERNAL_H_
#include <memory>
#include <optional>
#include "base/memory/raw_ptr.h"
#include "base/no_destructor.h"
#include "base/process/process_metrics.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_observer.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/common/process_visibility_tracker.h"
namespace content {
namespace internal {
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
// Histogram macros expect an enum class with kMaxValue. Because
// content::ProcessType cannot be migrated to this style at the moment, we
// specify a separate version here. Keep in sync with content::ProcessType.
// TODO(eseckler): Replace with content::ProcessType after its migration.
enum class ProcessTypeForUma {
kUnknown = 1,
kBrowser,
kRenderer,
kPluginDeprecated,
kWorkerDeprecated,
kUtility,
kZygote,
kSandboxHelper,
kGpu,
kPpapiPlugin,
kPpapiBroker,
kMaxValue = kPpapiBroker,
};
// Samples the process's CPU time after a specific number of task were executed
// on the current thread (process main). The number of tasks is a crude proxy
// for CPU activity within this process. We sample more frequently when the
// process is more active, thus ensuring we lose little CPU time attribution
// when the process is terminated, even after it was very active.
//
// Also samples some of the breakdowns when the process's visibility changes.
class CONTENT_EXPORT ProcessCpuTimeMetrics
: public base::TaskObserver,
public ProcessVisibilityTracker::ProcessVisibilityObserver {
public:
static ProcessCpuTimeMetrics* GetInstance();
~ProcessCpuTimeMetrics() override;
// base::TaskObserver implementation:
void WillProcessTask(const base::PendingTask& pending_task,
bool was_blocked_or_low_priority) override;
void DidProcessTask(const base::PendingTask& pending_task) override;
// ProcessVisibilityTracker::ProcessVisibilityObserver implementation:
void OnVisibilityChanged(bool visible) override;
void PerformFullCollectionForTesting();
void WaitForCollectionForTesting() const;
static std::unique_ptr<ProcessCpuTimeMetrics> CreateForTesting();
static void SetIgnoreHistogramAllocatorForTesting(bool ignore);
private:
friend class base::NoDestructor<ProcessCpuTimeMetrics>;
class DetailedCpuTimeMetrics;
explicit ProcessCpuTimeMetrics();
void InitializeOnThreadPool();
void PerformFullCollectionOnThreadPool();
void CollectHighLevelMetricsOnThreadPool();
void ReportAverageCpuLoad(base::TimeDelta cumulative_cpu_time);
// Sample CPU time after a certain number of main-thread task to balance
// overhead of sampling and loss at process termination.
static constexpr int kReportAfterEveryNTasksPersistentProcess = 2500;
static constexpr int kReportAfterEveryNTasksOtherProcess = 1000;
static constexpr base::TimeDelta kAvgCpuLoadReportInterval =
base::Seconds(30);
static constexpr base::TimeDelta kIdleCpuLoadReportInterval =
base::Seconds(5);
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// Accessed on main thread.
SEQUENCE_CHECKER(main_thread_);
int task_counter_ = 0;
int reporting_interval_ = 0; // set in constructor.
// Accessed on |task_runner_|.
SEQUENCE_CHECKER(thread_pool_);
std::unique_ptr<base::ProcessMetrics> process_metrics_;
std::optional<bool> is_visible_;
ProcessTypeForUma process_type_;
base::TimeDelta reported_cpu_time_;
base::TimeDelta cpu_time_on_last_load_report_;
base::TimeTicks cpu_load_report_time_;
// Lives on |task_runner_| after construction.
std::unique_ptr<DetailedCpuTimeMetrics> detailed_metrics_;
};
} // namespace internal
} // namespace content
#endif // CONTENT_COMMON_ANDROID_CPU_TIME_METRICS_INTERNAL_H_
|
