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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "components/scheduler/renderer/throttling_helper.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "components/scheduler/base/real_time_domain.h" | |
9 #include "components/scheduler/base/virtual_time_domain.h" | |
10 #include "components/scheduler/child/scheduler_tqm_delegate.h" | |
11 #include "components/scheduler/renderer/renderer_scheduler_impl.h" | |
12 #include "components/scheduler/renderer/web_frame_scheduler_impl.h" | |
13 #include "third_party/WebKit/public/platform/WebFrameScheduler.h" | |
14 | |
15 namespace scheduler { | |
16 | |
17 ThrottlingHelper::ThrottlingHelper(RendererSchedulerImpl* renderer_scheduler, | |
18 const char* tracing_category) | |
19 : task_runner_(renderer_scheduler->ControlTaskRunner()), | |
20 renderer_scheduler_(renderer_scheduler), | |
21 tick_clock_(renderer_scheduler->tick_clock()), | |
22 tracing_category_(tracing_category), | |
23 time_domain_(new VirtualTimeDomain(this, tick_clock_->NowTicks())), | |
24 pending_pump_throttled_tasks_(false), | |
25 work_to_do_(false), | |
26 weak_factory_(this) { | |
27 pump_throttled_tasks_closure_ = base::Bind( | |
28 &ThrottlingHelper::PumpThrottledTasks, weak_factory_.GetWeakPtr()); | |
29 forward_immediate_work_closure_ = | |
30 base::Bind(&ThrottlingHelper::OnTimeDomainHasImmediateWork, | |
31 weak_factory_.GetWeakPtr()); | |
32 renderer_scheduler_->RegisterTimeDomain(time_domain_); | |
33 } | |
34 | |
35 ThrottlingHelper::~ThrottlingHelper() { | |
36 renderer_scheduler_->UnregisterTimeDomain(time_domain_); | |
37 } | |
38 | |
39 void ThrottlingHelper::Throttle(TaskQueue* task_queue) { | |
40 throttled_queues_.insert(task_queue); | |
41 | |
42 task_queue->SetTimeDomain(time_domain_); | |
43 task_queue->SetPumpPolicy(TaskQueue::PumpPolicy::MANUAL); | |
44 | |
45 work_to_do_ |= task_queue->HasPendingImmediateTask(); | |
46 work_to_do_ |= task_queue->HasPendingDelayedTask(); | |
47 | |
48 MaybeSchedulePumpThrottledTasksLocked(); | |
49 } | |
50 | |
51 void ThrottlingHelper::Unthrottle(TaskQueue* task_queue) { | |
52 throttled_queues_.erase(task_queue); | |
53 | |
54 task_queue->SetTimeDomain(renderer_scheduler_->real_time_domain()); | |
55 task_queue->SetPumpPolicy(TaskQueue::PumpPolicy::AUTO); | |
56 if (throttled_queues_.empty()) | |
57 work_to_do_ = false; | |
58 } | |
59 | |
60 void ThrottlingHelper::Unregister(TaskQueue* task_queue) { | |
61 throttled_queues_.erase(task_queue); | |
62 | |
Sami
2015/11/25 17:12:25
DCHECK that the task queue isn't still in the virt
alex clarke (OOO till 29th)
2015/11/26 18:43:27
Acknowledged.
| |
63 if (throttled_queues_.empty()) | |
64 work_to_do_ = false; | |
65 } | |
66 | |
67 void ThrottlingHelper::OnTimeDomainHasImmediateWork() { | |
68 // Forward to the main thread if called from another thread. | |
69 if (!task_runner_->RunsTasksOnCurrentThread()) { | |
70 task_runner_->PostTask(FROM_HERE, forward_immediate_work_closure_); | |
71 return; | |
72 } | |
73 TRACE_EVENT0(tracing_category_, | |
74 "ThrottlingHelper::OnTimeDomainHasImmediateWork"); | |
75 work_to_do_ = true; | |
76 MaybeSchedulePumpThrottledTasksLocked(); | |
77 } | |
78 | |
79 void ThrottlingHelper::OnTimeDomainHasDelayedWork() { | |
80 TRACE_EVENT0(tracing_category_, | |
81 "ThrottlingHelper::OnTimeDomainHasDelayedWork"); | |
82 work_to_do_ = true; | |
83 MaybeSchedulePumpThrottledTasksLocked(); | |
84 } | |
85 | |
86 void ThrottlingHelper::PumpThrottledTasks() { | |
87 TRACE_EVENT0(tracing_category_, "ThrottlingHelper::PumpThrottledTasks"); | |
88 pending_pump_throttled_tasks_ = false; | |
89 | |
90 time_domain_->AdvanceTo(tick_clock_->NowTicks()); | |
91 work_to_do_ = false; | |
Sami
2015/11/25 17:12:25
Do we need this flag? Won't OnTimeDomainHasImmedia
alex clarke (OOO till 29th)
2015/11/26 18:43:27
Done.
| |
92 for (TaskQueue* task_queue : throttled_queues_) { | |
93 if (task_queue->HasPendingImmediateTask() || | |
94 task_queue->HasPendingDelayedTask()) { | |
95 task_queue->PumpQueue(); | |
96 work_to_do_ = true; | |
97 } | |
98 } | |
99 | |
100 MaybeSchedulePumpThrottledTasksLocked(); | |
101 } | |
102 | |
103 /* static */ | |
104 base::TimeDelta ThrottlingHelper::DelayToNextRunTimeInSeconds( | |
105 base::TimeTicks now) { | |
106 const base::TimeDelta one_second = base::TimeDelta::FromSeconds(1); | |
107 return one_second - ((now - base::TimeTicks()) % one_second); | |
108 } | |
109 | |
110 void ThrottlingHelper::MaybeSchedulePumpThrottledTasksLocked() { | |
111 if (pending_pump_throttled_tasks_ || !work_to_do_) | |
112 return; | |
113 | |
114 pending_pump_throttled_tasks_ = true; | |
115 task_runner_->PostDelayedTask( | |
116 FROM_HERE, pump_throttled_tasks_closure_, | |
117 DelayToNextRunTimeInSeconds(tick_clock_->NowTicks())); | |
118 } | |
119 | |
120 } // namespace scheduler | |
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