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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/performance_manager/public/resource_attribution/cpu_measurement_delegate.h"
#include "base/check.h"
#include "base/no_destructor.h"
#include "base/process/process.h"
#include "base/process/process_handle.h"
#include "base/process/process_metrics.h"
#include "base/types/expected.h"
#include "build/build_config.h"
#include "components/performance_manager/public/graph/process_node.h"
#include "components/performance_manager/resource_attribution/cpu_measurement_monitor.h"
#include "components/performance_manager/resource_attribution/performance_manager_aliases.h"
#include "components/performance_manager/resource_attribution/query_scheduler.h"
#include "content/public/browser/browser_child_process_host.h"
#include "content/public/common/process_type.h"
namespace resource_attribution {
namespace {
// A production CPUMeasurementDelegate that measures processes with
// base::ProcessMetrics.
class CPUMeasurementDelegateImpl final : public CPUMeasurementDelegate {
public:
explicit CPUMeasurementDelegateImpl(const ProcessNode* process_node);
~CPUMeasurementDelegateImpl() final = default;
base::expected<base::TimeDelta, ProcessCPUUsageError> GetCumulativeCPUUsage()
final;
private:
std::unique_ptr<base::ProcessMetrics> process_metrics_;
};
CPUMeasurementDelegateImpl::CPUMeasurementDelegateImpl(
const ProcessNode* process_node) {
const base::ProcessHandle handle = process_node->GetProcess().Handle();
#if BUILDFLAG(IS_MAC)
process_metrics_ = base::ProcessMetrics::CreateProcessMetrics(
handle, content::BrowserChildProcessHost::GetPortProvider());
#else
process_metrics_ = base::ProcessMetrics::CreateProcessMetrics(handle);
#endif
}
base::expected<base::TimeDelta, CPUMeasurementDelegate::ProcessCPUUsageError>
CPUMeasurementDelegateImpl::GetCumulativeCPUUsage() {
return process_metrics_->GetCumulativeCPUUsage();
}
// The default production factory for CPUMeasurementDelegateImpl objects.
class CPUMeasurementDelegateFactoryImpl final
: public CPUMeasurementDelegate::Factory {
public:
CPUMeasurementDelegateFactoryImpl() = default;
~CPUMeasurementDelegateFactoryImpl() final = default;
bool ShouldMeasureProcess(const ProcessNode* process_node) final;
std::unique_ptr<CPUMeasurementDelegate> CreateDelegateForProcess(
const ProcessNode* process_node) final;
};
bool CPUMeasurementDelegateFactoryImpl::ShouldMeasureProcess(
const ProcessNode* process_node) {
#if BUILDFLAG(IS_ANDROID)
// On Android, sandbox restrictions prevent the browser process from reading
// /proc/<pid>/stat of other processes. Bail out early to avoid the overhead
// of trying and failing to read the file.
// TODO(crbug.com/421901748): Implement CPU measurement of child processes on
// Android.
if (process_node->GetProcessId() != base::GetCurrentProcId()) {
return false;
}
#endif
return ProcessNodeHasRunningProcess(process_node);
}
std::unique_ptr<CPUMeasurementDelegate>
CPUMeasurementDelegateFactoryImpl::CreateDelegateForProcess(
const ProcessNode* process_node) {
return std::make_unique<CPUMeasurementDelegateImpl>(process_node);
}
} // namespace
// static
void CPUMeasurementDelegate::SetDelegateFactoryForTesting(Graph* graph,
Factory* factory) {
auto* scheduler = internal::QueryScheduler::GetFromGraph(graph);
CHECK(scheduler);
scheduler
->GetCPUMonitorForTesting() // IN-TEST
.SetDelegateFactoryForTesting(factory ? factory // IN-TEST
: GetDefaultFactory());
}
// static
CPUMeasurementDelegate::Factory* CPUMeasurementDelegate::GetDefaultFactory() {
static base::NoDestructor<CPUMeasurementDelegateFactoryImpl> default_factory;
return default_factory.get();
}
// static
bool CPUMeasurementDelegate::Factory::ProcessNodeHasRunningProcess(
const performance_manager::ProcessNode* process_node) {
// The process start time is not available until the ProcessId is assigned.
if (process_node->GetProcessId() == base::kNullProcessId) {
return false;
}
// ShouldMeasureProcess() can be called from OnProcessLifetimeChange after a
// process exits. Only handle process start notifications (which is when the
// pid is assigned), not exit notifications. Note the pid can be reassigned if
// a process dies and a new one is started for the same ProcessNode - in that
// case MonitorCPUUsage will reset the measurements and start monitoring the
// new process from scratch.
if (!process_node->GetProcess().IsValid()) {
return false;
}
return true;
}
} // namespace resource_attribution
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