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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.
#ifndef COMPONENTS_POWER_METRICS_ENERGY_METRICS_PROVIDER_LINUX_H_
#define COMPONENTS_POWER_METRICS_ENERGY_METRICS_PROVIDER_LINUX_H_
#include <memory>
#include <string>
#include <vector>
#include "base/files/scoped_file.h"
#include "components/power_metrics/energy_metrics_provider.h"
namespace power_metrics {
// EnergyMetricsProviderLinux can only work on platforms with Intel Processor
// with RAPL interface. It also requires at least Linux 3.14 and
// /proc/sys/kernel/perf_event_paranoid < 1, which grants permission to read
// perf event.
class EnergyMetricsProviderLinux : public EnergyMetricsProvider {
public:
// A PowerEvent corresponds to a metric, which includes the metric type, the
// scale from ticks to joules and the file descriptor for reading perf data.
struct PowerEvent {
std::string metric_type;
double scale;
base::ScopedFD fd;
PowerEvent(std::string metric_type, double scale, base::ScopedFD fd);
~PowerEvent();
PowerEvent(PowerEvent&& other);
PowerEvent& operator=(PowerEvent&& other);
};
// Factory method for production instances.
static std::unique_ptr<EnergyMetricsProviderLinux> Create();
EnergyMetricsProviderLinux(const EnergyMetricsProviderLinux&) = delete;
EnergyMetricsProviderLinux& operator=(const EnergyMetricsProviderLinux&) =
delete;
~EnergyMetricsProviderLinux() override;
// EnergyMetricsProvider implementation.
std::optional<EnergyMetrics> CaptureMetrics() override;
private:
EnergyMetricsProviderLinux();
bool Initialize();
// Used to derive energy consumption data via perf event.
std::vector<PowerEvent> events_;
bool is_initialized_ = false;
};
} // namespace power_metrics
#endif // COMPONENTS_POWER_METRICS_ENERGY_METRICS_PROVIDER_LINUX_H_
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