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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "powerhal-adaptivecpu"
#define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)
#include "AdaptiveCpuConfig.h"
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <inttypes.h>
#include <utils/Trace.h>
#include <sstream>
#include <string>
#include <string_view>
namespace aidl {
namespace google {
namespace hardware {
namespace power {
namespace impl {
namespace pixel {
using std::chrono_literals::operator""ms;
using std::chrono_literals::operator""min;
constexpr std::string_view kIterationSleepDurationProperty(
"debug.adaptivecpu.iteration_sleep_duration_ms");
static const std::chrono::milliseconds kIterationSleepDurationMin = 20ms;
constexpr std::string_view kHintTimeoutProperty("debug.adaptivecpu.hint_timeout_ms");
// "percent" as range is 0-100, while the in-memory is "probability" as range is 0-1.
constexpr std::string_view kRandomThrottleDecisionPercentProperty(
"debug.adaptivecpu.random_throttle_decision_percent");
constexpr std::string_view kRandomThrottleOptionsProperty(
"debug.adaptivecpu.random_throttle_options");
constexpr std::string_view kEnabledHintTimeoutProperty("debug.adaptivecpu.enabled_hint_timeout_ms");
bool ParseThrottleDecisions(const std::string &input, std::vector<ThrottleDecision> *output);
std::string FormatThrottleDecisions(const std::vector<ThrottleDecision> &throttleDecisions);
const AdaptiveCpuConfig AdaptiveCpuConfig::DEFAULT{
// N.B.: The model will typically be trained with this value set to 25ms. We set it to 1s as
// a safety measure, but best performance will be seen at 25ms.
.iterationSleepDuration = 1000ms,
.hintTimeout = 2000ms,
.randomThrottleDecisionProbability = 0,
.randomThrottleOptions = {ThrottleDecision::NO_THROTTLE, ThrottleDecision::THROTTLE_50,
ThrottleDecision::THROTTLE_60, ThrottleDecision::THROTTLE_70,
ThrottleDecision::THROTTLE_80, ThrottleDecision::THROTTLE_90},
.enabledHintTimeout = 120min,
};
bool AdaptiveCpuConfig::ReadFromSystemProperties(AdaptiveCpuConfig *output) {
ATRACE_CALL();
output->iterationSleepDuration = std::chrono::milliseconds(
::android::base::GetUintProperty<uint32_t>(kIterationSleepDurationProperty.data(),
DEFAULT.iterationSleepDuration.count()));
output->iterationSleepDuration =
std::max(output->iterationSleepDuration, kIterationSleepDurationMin);
output->hintTimeout = std::chrono::milliseconds(::android::base::GetUintProperty<uint32_t>(
kHintTimeoutProperty.data(), DEFAULT.hintTimeout.count()));
output->randomThrottleDecisionProbability =
static_cast<double>(::android::base::GetUintProperty<uint32_t>(
kRandomThrottleDecisionPercentProperty.data(),
DEFAULT.randomThrottleDecisionProbability * 100)) /
100;
if (output->randomThrottleDecisionProbability > 1.0) {
LOG(ERROR) << "Received bad value for " << kRandomThrottleDecisionPercentProperty << ": "
<< output->randomThrottleDecisionProbability;
return false;
}
const std::string randomThrottleOptionsStr =
::android::base::GetProperty(kRandomThrottleOptionsProperty.data(),
FormatThrottleDecisions(DEFAULT.randomThrottleOptions));
output->randomThrottleOptions.clear();
if (!ParseThrottleDecisions(randomThrottleOptionsStr, &output->randomThrottleOptions)) {
return false;
}
output->enabledHintTimeout =
std::chrono::milliseconds(::android::base::GetUintProperty<uint32_t>(
kEnabledHintTimeoutProperty.data(), DEFAULT.enabledHintTimeout.count()));
return true;
}
bool AdaptiveCpuConfig::operator==(const AdaptiveCpuConfig &other) const {
return iterationSleepDuration == other.iterationSleepDuration &&
hintTimeout == other.hintTimeout &&
randomThrottleDecisionProbability == other.randomThrottleDecisionProbability &&
enabledHintTimeout == other.enabledHintTimeout &&
randomThrottleOptions == other.randomThrottleOptions;
}
std::ostream &operator<<(std::ostream &stream, const AdaptiveCpuConfig &config) {
stream << "AdaptiveCpuConfig(";
stream << "iterationSleepDuration=" << config.iterationSleepDuration.count() << "ms, ";
stream << "hintTimeout=" << config.hintTimeout.count() << "ms, ";
stream << "randomThrottleDecisionProbability=" << config.randomThrottleDecisionProbability
<< ", ";
stream << "enabledHintTimeout=" << config.enabledHintTimeout.count() << "ms, ";
stream << "randomThrottleOptions=[" << FormatThrottleDecisions(config.randomThrottleOptions)
<< "]";
stream << ")";
return stream;
}
bool ParseThrottleDecisions(const std::string &input, std::vector<ThrottleDecision> *output) {
std::stringstream ss(input);
while (ss.good()) {
std::string throttleDecisionStr;
if (std::getline(ss, throttleDecisionStr, ',').fail()) {
LOG(ERROR) << "Failed to getline on throttle decisions string: " << input;
return false;
}
uint32_t throttleDecisionInt;
int scanEnd;
if (std::sscanf(throttleDecisionStr.c_str(), "%" PRIu32 "%n", &throttleDecisionInt,
&scanEnd) != 1 ||
scanEnd != throttleDecisionStr.size()) {
LOG(ERROR) << "Failed to parse as int: str=" << throttleDecisionStr
<< ", input=" << input << ", scanEnd=" << scanEnd;
return false;
}
if (throttleDecisionInt < static_cast<uint32_t>(ThrottleDecision::FIRST) ||
throttleDecisionInt > static_cast<uint32_t>(ThrottleDecision::LAST)) {
LOG(ERROR) << "Failed to parse throttle decision: throttleDecision="
<< throttleDecisionInt << ", input=" << input;
return false;
}
output->push_back(static_cast<ThrottleDecision>(throttleDecisionInt));
}
if (output->empty()) {
LOG(ERROR) << "Failed to find any throttle decisions, must have at least one: " << input;
return false;
}
return true;
}
std::string FormatThrottleDecisions(const std::vector<ThrottleDecision> &throttleDecisions) {
std::stringstream ss;
for (size_t i = 0; i < throttleDecisions.size(); i++) {
ss << static_cast<uint32_t>(throttleDecisions[i]);
if (i < throttleDecisions.size() - 1) {
ss << ",";
}
}
return ss.str();
}
} // namespace pixel
} // namespace impl
} // namespace power
} // namespace hardware
} // namespace google
} // namespace aidl
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