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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/task/sequence_manager/thread_controller_power_monitor.h"
#include "base/feature_list.h"
#include "base/power_monitor/power_monitor.h"
#include "base/trace_event/trace_event.h"
namespace base::sequence_manager::internal {
namespace {
// Activate the power management events that affect task scheduling.
BASE_FEATURE(kUsePowerMonitorWithThreadController,
"UsePowerMonitorWithThreadController",
FEATURE_ENABLED_BY_DEFAULT);
// TODO(crbug.com/40127966): Remove this when the experiment becomes the
// default.
bool g_use_thread_controller_power_monitor_ = false;
} // namespace
ThreadControllerPowerMonitor::ThreadControllerPowerMonitor() = default;
ThreadControllerPowerMonitor::~ThreadControllerPowerMonitor() {
PowerMonitor::GetInstance()->RemovePowerSuspendObserver(this);
}
void ThreadControllerPowerMonitor::BindToCurrentThread() {
// Occasionally registration happens twice (i.e. when the
// ThreadController::SetDefaultTaskRunner() re-initializes the
// ThreadController).
auto* power_monitor = PowerMonitor::GetInstance();
if (is_observer_registered_) {
power_monitor->RemovePowerSuspendObserver(this);
}
// Register the observer to deliver notifications on the current thread.
power_monitor->AddPowerSuspendObserver(this);
is_observer_registered_ = true;
}
bool ThreadControllerPowerMonitor::IsProcessInPowerSuspendState() {
return is_power_suspended_;
}
// static
void ThreadControllerPowerMonitor::InitializeFeatures() {
DCHECK(!g_use_thread_controller_power_monitor_);
g_use_thread_controller_power_monitor_ =
FeatureList::IsEnabled(kUsePowerMonitorWithThreadController);
}
// static
void ThreadControllerPowerMonitor::OverrideUsePowerMonitorForTesting(
bool use_power_monitor) {
g_use_thread_controller_power_monitor_ = use_power_monitor;
}
// static
void ThreadControllerPowerMonitor::ResetForTesting() {
g_use_thread_controller_power_monitor_ = false;
}
void ThreadControllerPowerMonitor::OnSuspend() {
if (!g_use_thread_controller_power_monitor_) {
return;
}
DCHECK(!is_power_suspended_);
TRACE_EVENT_BEGIN("base", "ThreadController::Suspended",
perfetto::Track(reinterpret_cast<uint64_t>(this),
perfetto::ThreadTrack::Current()));
is_power_suspended_ = true;
}
void ThreadControllerPowerMonitor::OnResume() {
if (!g_use_thread_controller_power_monitor_) {
return;
}
// It is possible a suspend was already happening before the observer was
// added to the power monitor. Ignoring the resume notification in that case.
if (is_power_suspended_) {
TRACE_EVENT_END("base" /* ThreadController::Suspended */,
perfetto::Track(reinterpret_cast<uint64_t>(this),
perfetto::ThreadTrack::Current()));
is_power_suspended_ = false;
}
}
} // namespace base::sequence_manager::internal
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