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// Copyright 2025 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/threading/platform_thread_metrics.h"
#include <memory>
#include <mutex>
#include <optional>
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/sparse_histogram.h"
#include "base/no_destructor.h"
#include "base/process/current_process.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/synchronization/lock.h"
#include "base/task/thread_pool.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
#if BUILDFLAG(IS_ANDROID)
#include "base/threading/platform_thread_internal_posix.h"
#endif // BUILDFLAG(IS_ANDROID)
namespace base {
namespace {
#if BUILDFLAG(IS_ANDROID)
std::string GetCurrentProcessName(CurrentProcess::NameKey key) {
std::string process_name = CurrentProcess::GetInstance().GetName(key);
// The process name may have whitespaces (e.g. 'GPU Process') and that won't
// work as a histogram name.
RemoveChars(process_name, " ", &process_name);
return process_name;
}
#endif // BUILDFLAG(IS_ANDROID)
} // namespace
// Apple and Windows have platform-specific create methods.
#if BUILDFLAG(IS_APPLE) || BUILDFLAG(IS_WIN)
// static
std::unique_ptr<PlatformThreadMetrics>
PlatformThreadMetrics::CreateForCurrentThread() {
return CreateFromHandle(PlatformThread::CurrentHandle());
}
#elif BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_CHROMEOS) || \
BUILDFLAG(IS_FUCHSIA) || BUILDFLAG(IS_LINUX)
// static
std::unique_ptr<PlatformThreadMetrics>
PlatformThreadMetrics::CreateForCurrentThread() {
return CreateFromId(PlatformThread::CurrentId());
}
// static
std::unique_ptr<PlatformThreadMetrics> PlatformThreadMetrics::CreateFromId(
PlatformThreadId tid) {
if (tid == kInvalidThreadId) {
return nullptr;
}
return WrapUnique(new PlatformThreadMetrics(tid));
}
#endif // BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_CHROMEOS) ||
// BUILDFLAG(IS_FUCHSIA) || BUILDFLAG(IS_LINUX)
PlatformThreadMetrics::~PlatformThreadMetrics() = default;
double PlatformThreadMetrics::GetCPUUsageProportion(TimeDelta cumulative_cpu) {
TimeTicks time = TimeTicks::Now();
if (!last_cpu_time_.has_value()) {
// First call, just set the last values.
CHECK(last_cumulative_cpu_.is_zero());
last_cumulative_cpu_ = cumulative_cpu;
last_cpu_time_ = time;
return 0;
}
TimeDelta cpu_time_delta = cumulative_cpu - last_cumulative_cpu_;
TimeDelta time_delta = time - last_cpu_time_.value();
if (time_delta.is_zero()) {
return 0;
}
last_cumulative_cpu_ = cumulative_cpu;
last_cpu_time_ = time;
return 100.0 * cpu_time_delta / time_delta;
}
std::optional<double> PlatformThreadMetrics::GetCPUUsageProportion() {
if (const std::optional<TimeDelta> cpu_usage = GetCumulativeCPUUsage()) {
return GetCPUUsageProportion(cpu_usage.value());
}
return std::nullopt;
}
#if BUILDFLAG(IS_ANDROID)
PlatformThreadPriorityMonitor::PlatformThreadPriorityMonitor()
: process_name_(GetCurrentProcessName({})) {}
PlatformThreadPriorityMonitor::~PlatformThreadPriorityMonitor() = default;
// static
PlatformThreadPriorityMonitor& PlatformThreadPriorityMonitor::Get() {
static base::NoDestructor<PlatformThreadPriorityMonitor> instance;
return *instance;
}
std::string PlatformThreadPriorityMonitor::GetHistogramNameForSuffix(
const std::string_view suffix) {
return StrCat({"Scheduling.ThreadPriority.", process_name_, ".", suffix});
}
void PlatformThreadPriorityMonitor::RegisterCurrentThread(
const std::string_view suffix) {
PlatformThreadId current_thread_id = PlatformThread::CurrentId();
HistogramBase* histogram =
SparseHistogram::FactoryGet(GetHistogramNameForSuffix(suffix),
HistogramBase::kUmaTargetedHistogramFlag);
AutoLock auto_lock(lock_);
thread_id_to_histogram_[current_thread_id] = histogram;
}
void PlatformThreadPriorityMonitor::UnregisterCurrentThread() {
PlatformThreadId current_thread_id = PlatformThread::CurrentId();
AutoLock auto_lock(lock_);
thread_id_to_histogram_.erase(current_thread_id);
}
void PlatformThreadPriorityMonitor::RecordThreadPriorities() {
AutoLock auto_lock(lock_);
for (auto& [thread_id, histogram] : thread_id_to_histogram_) {
histogram->Add(internal::GetThreadNiceValue(thread_id));
}
}
// static
void PlatformThreadPriorityMonitor::ScheduleRecordingTask() {
static NoDestructor<RepeatingClosure> closure(BindRepeating([] {
auto& monitor = PlatformThreadPriorityMonitor::Get();
monitor.RecordThreadPriorities();
monitor.ScheduleRecordingTask();
}));
ThreadPool::PostDelayedTask(
FROM_HERE,
{TaskPriority::BEST_EFFORT, TaskShutdownBehavior::SKIP_ON_SHUTDOWN},
*closure, kMinSamplingInterval);
}
void PlatformThreadPriorityMonitor::Start() {
std::call_once(once_flag_,
&PlatformThreadPriorityMonitor::ScheduleRecordingTask);
}
#endif // BUILDFLAG(IS_ANDROID)
} // namespace base
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