91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
#pragma once
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/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <chrono>
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#include <map>
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#include <ostream>
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#include <set>
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#include <vector>
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#include "IFilesystem.h"
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#include "RealFilesystem.h"
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namespace aidl {
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namespace google {
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namespace hardware {
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namespace power {
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namespace impl {
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namespace pixel {
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struct CpuPolicyAverageFrequency {
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const uint32_t policyId;
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const uint64_t averageFrequencyHz;
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bool operator==(const CpuPolicyAverageFrequency &other) const {
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return policyId == other.policyId && averageFrequencyHz == other.averageFrequencyHz;
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}
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};
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class CpuFrequencyReader {
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public:
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CpuFrequencyReader() : mFilesystem(std::make_unique<RealFilesystem>()) {}
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CpuFrequencyReader(std::unique_ptr<IFilesystem> filesystem)
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: mFilesystem(std::move(filesystem)) {}
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// Initialize reading, must be done before calling other methods.
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// Work is not done in constructor as it accesses files.
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// Returns true on success.
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bool Init();
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// Gets the average frequency each CPU policy was using, since this method was last called.
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// Results are returned sorted by policyId.
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// Returns true on success.
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bool GetRecentCpuPolicyFrequencies(std::vector<CpuPolicyAverageFrequency> *result);
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// The most recently read frequencies for each CPU policy. See readCpuPolicyFrequencies for type
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// explanation. Used for dumping to bug reports.
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std::map<uint32_t, std::map<uint64_t, std::chrono::milliseconds>>
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GetPreviousCpuPolicyFrequencies() const;
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private:
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// CPU policy IDs read from /sys. Initialized in #init(). Sorted ascending.
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std::vector<uint32_t> mCpuPolicyIds;
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// The CPU frequencies when #getRecentCpuPolicyFrequencies was last called (or #init if it has
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// not been called yet).
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// See readCpuPolicyFrequencies for explanation of type.
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std::map<uint32_t, std::map<uint64_t, std::chrono::milliseconds>> mPreviousCpuPolicyFrequencies;
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const std::unique_ptr<IFilesystem> mFilesystem;
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// Reads, from the /sys filesystem, the CPU frequencies used by each policy.
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// - The outer map's key is the CPU policy ID.
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// - The inner map's key is the CPU frequency in Hz.
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// - The inner map's value is the time the policy has been running at that frequency, aggregated
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// since boot.
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// Returns true on success.
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bool ReadCpuPolicyFrequencies(
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std::map<uint32_t, std::map<uint64_t, std::chrono::milliseconds>> *result);
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bool ReadCpuPolicyIds(std::vector<uint32_t> *result) const;
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};
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} // namespace pixel
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} // namespace impl
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} // namespace power
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} // namespace hardware
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} // namespace google
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} // namespace aidl
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