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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/scheduler/common/throttling/cpu_time_budget_pool.h"
#include <cstdint>
#include "base/logging.h"
#include "base/optional.h"
#include "third_party/blink/renderer/platform/scheduler/common/throttling/task_queue_throttler.h"
namespace blink {
namespace scheduler {
CPUTimeBudgetPool::CPUTimeBudgetPool(
const char* name,
BudgetPoolController* budget_pool_controller,
TraceableVariableController* tracing_controller,
base::TimeTicks now)
: BudgetPool(name, budget_pool_controller),
current_budget_level_(base::TimeDelta(),
"RendererScheduler.BackgroundBudgetMs",
budget_pool_controller,
tracing_controller,
TimeDeltaToMilliseconds),
last_checkpoint_(now),
cpu_percentage_(1) {}
CPUTimeBudgetPool::~CPUTimeBudgetPool() = default;
QueueBlockType CPUTimeBudgetPool::GetBlockType() const {
return QueueBlockType::kAllTasks;
}
void CPUTimeBudgetPool::SetMaxBudgetLevel(
base::TimeTicks now,
base::Optional<base::TimeDelta> max_budget_level) {
Advance(now);
max_budget_level_ = max_budget_level;
EnforceBudgetLevelRestrictions();
}
void CPUTimeBudgetPool::SetMaxThrottlingDelay(
base::TimeTicks now,
base::Optional<base::TimeDelta> max_throttling_delay) {
Advance(now);
max_throttling_delay_ = max_throttling_delay;
EnforceBudgetLevelRestrictions();
}
void CPUTimeBudgetPool::SetMinBudgetLevelToRun(
base::TimeTicks now,
base::TimeDelta min_budget_level_to_run) {
Advance(now);
min_budget_level_to_run_ = min_budget_level_to_run;
}
void CPUTimeBudgetPool::SetTimeBudgetRecoveryRate(base::TimeTicks now,
double cpu_percentage) {
Advance(now);
cpu_percentage_ = cpu_percentage;
EnforceBudgetLevelRestrictions();
}
void CPUTimeBudgetPool::GrantAdditionalBudget(base::TimeTicks now,
base::TimeDelta budget_level) {
Advance(now);
current_budget_level_ += budget_level;
EnforceBudgetLevelRestrictions();
}
void CPUTimeBudgetPool::SetReportingCallback(
base::RepeatingCallback<void(base::TimeDelta)> reporting_callback) {
reporting_callback_ = reporting_callback;
}
bool CPUTimeBudgetPool::CanRunTasksAt(base::TimeTicks moment,
bool is_wake_up) const {
return moment >= GetNextAllowedRunTime(moment);
}
base::Optional<base::TimeTicks> CPUTimeBudgetPool::GetTimeTasksCanRunUntil(
base::TimeTicks now,
bool is_wake_up) const {
if (CanRunTasksAt(now, is_wake_up))
return base::nullopt;
return base::TimeTicks();
}
base::TimeTicks CPUTimeBudgetPool::GetNextAllowedRunTime(
base::TimeTicks desired_run_time) const {
if (!is_enabled_ || current_budget_level_->InMicroseconds() >= 0)
return last_checkpoint_;
// Subtract because current_budget is negative.
return last_checkpoint_ +
(-current_budget_level_ + min_budget_level_to_run_) / cpu_percentage_;
}
void CPUTimeBudgetPool::RecordTaskRunTime(TaskQueue* queue,
base::TimeTicks start_time,
base::TimeTicks end_time) {
DCHECK_LE(start_time, end_time);
Advance(end_time);
if (is_enabled_) {
base::TimeDelta old_budget_level = current_budget_level_;
current_budget_level_ -= (end_time - start_time);
EnforceBudgetLevelRestrictions();
if (!reporting_callback_.is_null() && old_budget_level.InSecondsF() > 0 &&
current_budget_level_->InSecondsF() < 0) {
reporting_callback_.Run(-current_budget_level_ / cpu_percentage_);
}
}
if (current_budget_level_->InSecondsF() < 0)
BlockThrottledQueues(end_time);
}
void CPUTimeBudgetPool::OnQueueNextWakeUpChanged(
TaskQueue* queue,
base::TimeTicks now,
base::TimeTicks desired_run_time) {
budget_pool_controller_->UpdateQueueThrottlingState(now, queue);
}
void CPUTimeBudgetPool::OnWakeUp(base::TimeTicks now) {}
void CPUTimeBudgetPool::AsValueInto(base::trace_event::TracedValue* state,
base::TimeTicks now) const {
current_budget_level_.Trace();
state->BeginDictionary(name_);
state->SetString("name", name_);
state->SetDouble("time_budget", cpu_percentage_);
state->SetDouble("time_budget_level_in_seconds",
current_budget_level_->InSecondsF());
state->SetDouble("last_checkpoint_seconds_ago",
(now - last_checkpoint_).InSecondsF());
state->SetBoolean("is_enabled", is_enabled_);
state->SetDouble("min_budget_level_to_run_in_seconds",
min_budget_level_to_run_.InSecondsF());
if (max_throttling_delay_) {
state->SetDouble("max_throttling_delay_in_seconds",
max_throttling_delay_.value().InSecondsF());
}
if (max_budget_level_) {
state->SetDouble("max_budget_level_in_seconds",
max_budget_level_.value().InSecondsF());
}
state->BeginArray("task_queues");
for (TaskQueue* queue : associated_task_queues_) {
state->AppendString(PointerToString(queue));
}
state->EndArray();
state->EndDictionary();
}
void CPUTimeBudgetPool::Advance(base::TimeTicks now) {
if (now > last_checkpoint_) {
if (is_enabled_) {
current_budget_level_ += cpu_percentage_ * (now - last_checkpoint_);
EnforceBudgetLevelRestrictions();
}
last_checkpoint_ = now;
}
}
void CPUTimeBudgetPool::EnforceBudgetLevelRestrictions() {
if (max_budget_level_) {
current_budget_level_ =
std::min(current_budget_level_.value(), max_budget_level_.value());
}
if (max_throttling_delay_) {
// Current budget level may be negative.
current_budget_level_ =
std::max(current_budget_level_.value(),
-max_throttling_delay_.value() * cpu_percentage_);
}
}
} // namespace scheduler
} // namespace blink
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