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/*
* Copyright 2019 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.
*/
#pragma once
#include <numeric>
#include "Scheduler/RefreshRateConfigs.h"
#include "Scheduler/SchedulerUtils.h"
#include "TimeStats/TimeStats.h"
#include "android-base/stringprintf.h"
#include "utils/Timers.h"
namespace android {
namespace scheduler {
/**
* Class to encapsulate statistics about refresh rates that the display is using. When the power
* mode is set to HWC_POWER_MODE_NORMAL, SF is switching between refresh rates that are stored in
* the device's configs. Otherwise, we assume the HWC is running in power saving mode under the
* hood (eg. the device is in DOZE, or screen off mode).
*/
class RefreshRateStats {
static constexpr int64_t MS_PER_S = 1000;
static constexpr int64_t MS_PER_MIN = 60 * MS_PER_S;
static constexpr int64_t MS_PER_HOUR = 60 * MS_PER_MIN;
static constexpr int64_t MS_PER_DAY = 24 * MS_PER_HOUR;
public:
RefreshRateStats(const RefreshRateConfigs& refreshRateConfigs, TimeStats& timeStats)
: mRefreshRateConfigs(refreshRateConfigs), mTimeStats(timeStats) {}
// Sets power mode. We only collect the information when the power mode is not
// HWC_POWER_MODE_NORMAL. When power mode is HWC_POWER_MODE_NORMAL, we collect the stats based
// on config mode.
void setPowerMode(int mode) {
if (mCurrentPowerMode == mode) {
return;
}
// If power mode is normal, the time is going to be recorded under config modes.
if (mode == HWC_POWER_MODE_NORMAL) {
mCurrentPowerMode = mode;
return;
}
flushTime();
mCurrentPowerMode = mode;
}
// Sets config mode. If the mode has changed, it records how much time was spent in the previous
// mode.
void setConfigMode(int mode) {
if (mCurrentConfigMode == mode) {
return;
}
flushTime();
mCurrentConfigMode = mode;
}
// Returns a map between human readable refresh rate and number of seconds the device spent in
// that mode.
std::unordered_map<std::string, int64_t> getTotalTimes() {
// If the power mode is on, then we are probably switching between the config modes. If
// it's not then the screen is probably off. Make sure to flush times before printing
// them.
flushTime();
std::unordered_map<std::string, int64_t> totalTime;
for (const auto& [type, config] : mRefreshRateConfigs.getRefreshRates()) {
int64_t totalTimeForConfig = 0;
if (!config) {
continue;
}
if (mConfigModesTotalTime.find(config->configId) != mConfigModesTotalTime.end()) {
totalTimeForConfig = mConfigModesTotalTime.at(config->configId);
}
totalTime[config->name] = totalTimeForConfig;
}
return totalTime;
}
// Traverses through the map of config modes and returns how long they've been running in easy
// to read format.
std::string doDump() const {
std::ostringstream stream;
stream << "+ Refresh rate: running time in seconds\n";
for (const auto& [name, time] : const_cast<RefreshRateStats*>(this)->getTotalTimes()) {
stream << name << ": " << getDateFormatFromMs(time) << '\n';
}
return stream.str();
}
private:
void flushTime() {
// Normal power mode is counted under different config modes.
if (mCurrentPowerMode == HWC_POWER_MODE_NORMAL) {
flushTimeForMode(mCurrentConfigMode);
} else {
flushTimeForMode(SCREEN_OFF_CONFIG_ID);
}
}
// Calculates the time that passed in ms between the last time we recorded time and the time
// this method was called.
void flushTimeForMode(int mode) {
nsecs_t currentTime = systemTime();
nsecs_t timeElapsed = currentTime - mPreviousRecordedTime;
int64_t timeElapsedMs = ns2ms(timeElapsed);
mPreviousRecordedTime = currentTime;
mConfigModesTotalTime[mode] += timeElapsedMs;
for (const auto& [type, config] : mRefreshRateConfigs.getRefreshRates()) {
if (!config) {
continue;
}
if (config->configId == mode) {
mTimeStats.recordRefreshRate(config->fps, timeElapsed);
}
}
}
// Formats the time in milliseconds into easy to read format.
static std::string getDateFormatFromMs(int64_t timeMs) {
auto [days, dayRemainderMs] = std::div(timeMs, MS_PER_DAY);
auto [hours, hourRemainderMs] = std::div(dayRemainderMs, MS_PER_HOUR);
auto [mins, minsRemainderMs] = std::div(hourRemainderMs, MS_PER_MIN);
auto [sec, secRemainderMs] = std::div(minsRemainderMs, MS_PER_S);
return base::StringPrintf("%" PRId64 "d%02" PRId64 ":%02" PRId64 ":%02" PRId64
".%03" PRId64,
days, hours, mins, sec, secRemainderMs);
}
// Keeps information about refresh rate configs that device has.
const RefreshRateConfigs& mRefreshRateConfigs;
// Aggregate refresh rate statistics for telemetry.
TimeStats& mTimeStats;
int64_t mCurrentConfigMode = SCREEN_OFF_CONFIG_ID;
int32_t mCurrentPowerMode = HWC_POWER_MODE_OFF;
std::unordered_map<int /* power mode */, int64_t /* duration in ms */> mConfigModesTotalTime;
nsecs_t mPreviousRecordedTime = systemTime();
};
} // namespace scheduler
} // namespace android
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