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
|
// 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_COMMON_FEATURES_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_COMMON_FEATURES_H_
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
#include "base/time/time.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace blink {
namespace scheduler {
BASE_FEATURE(kDedicatedWorkerThrottling,
"BlinkSchedulerWorkerThrottling",
base::FEATURE_DISABLED_BY_DEFAULT);
BASE_FEATURE(kBestEffortPriorityForFindInPage,
"BlinkSchedulerBestEffortPriorityForFindInPage",
base::FEATURE_DISABLED_BY_DEFAULT);
// Enable setting high priority database task type from field trial parameters.
BASE_FEATURE(kHighPriorityDatabaseTaskType,
"HighPriorityDatabaseTaskType",
base::FEATURE_DISABLED_BY_DEFAULT);
// When features::kIntensiveWakeUpThrottling is enabled, wake ups from timers
// with a high nesting level are limited to 1 per minute on a page that has been
// backgrounded for GetIntensiveWakeUpThrottlingGracePeriod().
//
// Intensive wake up throttling is enforced in addition to other throttling
// mechanisms:
// - 1 wake up per second in a background page or hidden cross-origin frame
// - 1% CPU time in a page that has been backgrounded for 10 seconds
//
// Feature tracking bug: https://crbug.com/1075553
//
// Note that features::kIntensiveWakeUpThrottling should not be read from;
// rather the provided accessors should be used, which also take into account
// the managed policy override of the feature.
//
// Parameter name and default values, exposed for testing.
constexpr int kIntensiveWakeUpThrottling_GracePeriodSeconds_Default = 5 * 60;
constexpr int kIntensiveWakeUpThrottling_GracePeriodSecondsLoaded_Default = 60;
// Exposed so that multiple tests can tinker with the policy override.
PLATFORM_EXPORT void
ClearIntensiveWakeUpThrottlingPolicyOverrideCacheForTesting();
// Determines if the feature is enabled, taking into account base::Feature
// settings and policy overrides.
PLATFORM_EXPORT bool IsIntensiveWakeUpThrottlingEnabled();
// Grace period after hiding a page during which there is no intensive wake up
// throttling for the kIntensiveWakeUpThrottling feature.
// |loading| is the loading state of the page, used to determine if the grace
// period should be overwritten when kQuickIntensiveWakeUpThrottlingAfterLoading
// is enabled.
PLATFORM_EXPORT base::TimeDelta GetIntensiveWakeUpThrottlingGracePeriod(
bool loading);
// If enabled, base::SingleThreadTaskRunner::GetCurrentDefault() and
// base::SequencedTaskRunner::GetCurrentDefault() returns the current active
// per-ASG task runner instead of the per-thread task runner.
BASE_FEATURE(kMbiOverrideTaskRunnerHandle,
"MbiOverrideTaskRunnerHandle",
base::FEATURE_DISABLED_BY_DEFAULT);
// Buffer time that we want to extend the loading state after the FMP is
// received.
PLATFORM_EXPORT base::TimeDelta
GetLoadingPhaseBufferTimeAfterFirstMeaningfulPaint();
// Kill switch for throttling timed-out requestIdleCallback tasks.
PLATFORM_EXPORT BASE_DECLARE_FEATURE(kThrottleTimedOutIdleTasks);
// crbug.com/40785325 and crbug.com/378738907: If enabled, the signals used for
// idle periods are requested via WidgetScheduler::Delegate instead of via
// PageScheduler. This fixes a few issues where we might not get the requisite
// RequestBeginMainFrameNotExpected signals from a BeginMainFrame source, but
// are receiving BeginMainFrames, which can cause idle tasks to stop running.
BASE_FEATURE(kUseWidgetSchedulerForIdlePeriodSignals,
"UseWidgetSchedulerForIdlePeriodSignals",
base::FEATURE_ENABLED_BY_DEFAULT);
} // namespace scheduler
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_COMMON_FEATURES_H_
|
