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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_H_
#define COMPONENTS_POWER_METRICS_ENERGY_METRICS_PROVIDER_H_
#include <cstdint>
#include <memory>
#include <optional>
namespace power_metrics {
// EnergyMetricsProvider provides system-wide energy consumption metrics.
class EnergyMetricsProvider {
public:
struct EnergyMetrics {
// The absolute energy of the whole processor package.
uint64_t package_nanojoules;
// The absolute energy of all of the cores.
uint64_t cpu_nanojoules;
// The absolute energy of the uncore (usually the integrated GPU, only
// available in client CPUs).
uint64_t gpu_nanojoules;
// The absolute energy of the DRAM (only available in server CPUs).
uint64_t dram_nanojoules;
// The absolute energy of the entire system.
uint64_t psys_nanojoules;
// The following metrics are emitted by AMD processors.
// We don't know what they measure exactly.
uint64_t vdd_nanojoules;
uint64_t soc_nanojoules;
uint64_t socket_nanojoules;
uint64_t apu_nanojoules;
};
// Returns nullptr if no suitable implementation exists.
static std::unique_ptr<EnergyMetricsProvider> Create();
EnergyMetricsProvider(const EnergyMetricsProvider&) = delete;
EnergyMetricsProvider& operator=(const EnergyMetricsProvider&) = delete;
virtual ~EnergyMetricsProvider();
// Used to capture energy consumption metrics. It returns nullopt if not
// available on the current platform.
virtual std::optional<EnergyMetrics> CaptureMetrics() = 0;
protected:
// The constructor is intentionally only exposed to subclasses. Production
// code must use the Create() factory method.
EnergyMetricsProvider();
};
} // namespace power_metrics
#endif // COMPONENTS_POWER_METRICS_ENERGY_METRICS_PROVIDER_H_
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