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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/scheduler/browser_ui_thread_scheduler.h"
#include <utility>
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/message_loop/message_pump.h"
#include "base/message_loop/message_pump_type.h"
#include "base/process/process.h"
#include "base/run_loop.h"
#include "base/task/sequence_manager/sequence_manager.h"
#include "base/task/sequence_manager/sequence_manager_impl.h"
#include "base/task/sequence_manager/task_queue.h"
#include "base/task/sequence_manager/time_domain.h"
#include "base/threading/platform_thread.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "content/browser/scheduler/browser_task_priority.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/content_features.h"
namespace {
content::BrowserUIThreadScheduler* g_browser_ui_thread_scheduler = nullptr;
} // namespace
namespace content {
BrowserUIThreadScheduler::~BrowserUIThreadScheduler() = default;
// static
std::unique_ptr<BrowserUIThreadScheduler>
BrowserUIThreadScheduler::CreateForTesting(
base::sequence_manager::SequenceManager* sequence_manager) {
return base::WrapUnique(new BrowserUIThreadScheduler(sequence_manager));
}
BrowserUIThreadScheduler* BrowserUIThreadScheduler::Get() {
DCHECK(g_browser_ui_thread_scheduler);
return g_browser_ui_thread_scheduler;
}
BrowserUIThreadScheduler::BrowserUIThreadScheduler()
: owned_sequence_manager_(
base::sequence_manager::CreateUnboundSequenceManager(
base::sequence_manager::SequenceManager::Settings::Builder()
.SetMessagePumpType(base::MessagePumpType::UI)
.SetCanRunTasksByBatches(true)
.SetPrioritySettings(
internal::CreateBrowserTaskPrioritySettings())
.SetShouldSampleCPUTime(true)
.Build())),
task_queues_(BrowserThread::UI, owned_sequence_manager_.get()),
handle_(task_queues_.GetHandle()) {
task_queues_.SetOnTaskCompletedHandler(base::BindRepeating(
&BrowserUIThreadScheduler::OnTaskCompleted, base::Unretained(this)));
CommonSequenceManagerSetup(owned_sequence_manager_.get());
owned_sequence_manager_->SetDefaultTaskRunner(
handle_->GetDefaultTaskRunner());
owned_sequence_manager_->BindToMessagePump(
base::MessagePump::Create(base::MessagePumpType::UI));
g_browser_ui_thread_scheduler = this;
}
BrowserUIThreadScheduler::BrowserUIThreadScheduler(
base::sequence_manager::SequenceManager* sequence_manager)
: task_queues_(BrowserThread::UI, sequence_manager),
handle_(task_queues_.GetHandle()) {
CommonSequenceManagerSetup(sequence_manager);
g_browser_ui_thread_scheduler = this;
}
void BrowserUIThreadScheduler::CommonSequenceManagerSetup(
base::sequence_manager::SequenceManager* sequence_manager) {
DCHECK_EQ(static_cast<size_t>(sequence_manager->GetPriorityCount()),
static_cast<size_t>(internal::BrowserTaskPriority::kPriorityCount));
sequence_manager->EnableCrashKeys("ui_scheduler_async_stack");
}
void BrowserUIThreadScheduler::OnTaskCompleted(
const base::sequence_manager::Task& task,
base::sequence_manager::TaskQueue::TaskTiming* task_timing,
base::LazyNow* lazy_now) {
// Note: Thread time is already subsampled in sequence manager by a factor of
// |kTaskSamplingRateForRecordingCPUTime|. So browser main can piggy back on
// that subsampling to record histograms without fear of oversampling.
task_timing->RecordTaskEnd(lazy_now);
task_timing->RecordUmaOnCpuMetrics("BrowserScheduler.UIThread");
}
} // namespace content
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