673d3b0ab7
Bug: 206576142 Test: dumpsys android.hardware.power.stats.IPowerStats/default Change-Id: Iee66356150a8bdfcd1e0b3fe8b8d5ec9f601f543 Signed-off-by: Darren Hsu <darrenhsu@google.com>
112 lines
3.5 KiB
C++
112 lines
3.5 KiB
C++
/*
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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 "DevfreqStateResidencyDataProvider.h"
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#include <android-base/logging.h>
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static const std::string nameSuffix = "-DVFS";
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static const std::string pathSuffix = "/time_in_state";
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namespace aidl {
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namespace android {
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namespace hardware {
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namespace power {
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namespace stats {
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DevfreqStateResidencyDataProvider::DevfreqStateResidencyDataProvider(const std::string& name,
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const std::string& path) : mName(name + nameSuffix), mPath(path + pathSuffix) {}
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bool DevfreqStateResidencyDataProvider::extractNum(const char *str, char **str_end, int base,
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int64_t* num) {
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// errno can be set to any non-zero value by a library function call
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// regardless of whether there was an error, so it needs to be cleared
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// in order to check the error set by strtoll
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errno = 0;
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*num = std::strtoll(str, str_end, base);
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return (errno != ERANGE);
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}
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std::vector<std::pair<int64_t, int64_t>> DevfreqStateResidencyDataProvider::parseTimeInState() {
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// Using FILE* instead of std::ifstream for performance reasons
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std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(mPath.c_str(), "r"), fclose);
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if (!fp) {
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PLOG(ERROR) << "Failed to open file " << mPath;
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return {};
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}
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std::vector<std::pair<int64_t, int64_t>> timeInState;
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char *line = nullptr;
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size_t len = 0;
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while (getline(&line, &len, fp.get()) != -1) {
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char* pEnd;
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int64_t frequencyHz, totalTimeMs;
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if (!extractNum(line, &pEnd, 10, &frequencyHz) ||
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!extractNum(pEnd, &pEnd, 10, &totalTimeMs)) {
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PLOG(ERROR) << "Failed to parse " << mPath;
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free(line);
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return {};
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}
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timeInState.push_back({frequencyHz, totalTimeMs});
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}
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free(line);
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return timeInState;
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}
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bool DevfreqStateResidencyDataProvider::getStateResidencies(
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std::unordered_map<std::string, std::vector<StateResidency>> *residencies) {
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std::vector<std::pair<int64_t, int64_t>> timeInState = parseTimeInState();
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if (timeInState.empty()) {
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return false;
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}
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int32_t id = 0;
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std::vector<StateResidency> stateResidencies;
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for (const auto[frequencyHz, totalTimeMs] : timeInState) {
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StateResidency s = {.id = id++, .totalTimeInStateMs = totalTimeMs};
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stateResidencies.push_back(s);
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}
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residencies->emplace(mName, stateResidencies);
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return true;
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}
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std::unordered_map<std::string, std::vector<State>> DevfreqStateResidencyDataProvider::getInfo() {
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std::vector<std::pair<int64_t, int64_t>> timeInState = parseTimeInState();
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if (timeInState.empty()) {
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return {};
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}
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int32_t id = 0;
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std::vector<State> states;
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for (const auto[frequencyHz, totalTimeMs] : timeInState) {
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State s = {.id = id++, .name = std::to_string(frequencyHz / 1000) + "MHz"};
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states.push_back(s);
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}
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return {{mName, states}};
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}
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} // namespace stats
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} // namespace power
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} // namespace hardware
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} // namespace android
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} // namespace aidl
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