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
|
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
module mojom;
// Note that these states are emitted via UKMs, so the integer values should
// remain consistent.
enum LifecycleUnitState {
// The LifecycleUnit is alive and active with no CPU throttling.
ACTIVE = 0,
// Deprecated: THROTTLED = 1,
// Deprecated: PENDING_FREEZE = 2,
// The LifecycleUnit is frozen.
FROZEN = 3,
// Deprecated: PENDING_DISCARD = 4,
// The LifecycleUnit is discarded, and is consuming no system resources.
DISCARDED = 5,
// Deprecated: PENDING_UNFREEZE = 6,
};
// Indicates the loading state of a lifecycle unit, orthogonal to the basic
// lifecycle state. Note that these values are written to logs and histograms
// so need to remain consistent.
enum LifecycleUnitLoadingState {
// The LifecycleUnit is not yet loaded, or loading was attempted but failed.
UNLOADED = 0,
// The LifecycleUnit is loading.
LOADING = 1,
// The LifecycleUnit is loaded.
LOADED = 2,
};
// An enumeration of reasons why a lifecycle state change was applied. These are
// also emitted via UKM so need to remain stable.
enum LifecycleUnitStateChangeReason {
// Policy in the browser decided to initiate the state change.
BROWSER_INITIATED = 0,
// Policy in the renderer decided to initiate the state change.
RENDERER_INITIATED = 1,
// A system wide memory pressure condition initiated the state change.
SYSTEM_MEMORY_PRESSURE = 2,
// Initiated by an extension.
EXTENSION_INITIATED = 3,
// Initiated by a user action (e.g. changing focus, clicking reload).
USER_INITIATED = 4,
};
// An enumeration of reasons for a discard.
enum LifecycleUnitDiscardReason {
// The discard is requested from outside of TabManager (e.g. by an extension).
EXTERNAL = 0,
// The discard is requested urgently by TabManager when the system is in a
// critical condition.
URGENT = 1,
// The discard is requested proactively by PerformanceManager to free up
// memory before the system is under memory pressure, such as when Memory
// Saver Mode initiates a discard.
PROACTIVE = 2,
// The discard is requested by PerformanceDetectionManager because the
// manager has detected intensive resource usage and suggests discarding
// certain tabs in an attempt to improve resource usage.
SUGGESTED = 3,
// The discard is requested by FreezingPolicy for a frozen tab that grew its
// memory usage above a threshold.
FROZEN_WITH_GROWING_MEMORY = 4,
};
|
