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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 <chrono>
#include <cinttypes>
#include <cstdlib>
#include <string>
#include <android-base/stringprintf.h>
#include <ftl/algorithm.h>
#include <ftl/small_map.h>
#include <utils/Timers.h>
#include <scheduler/Fps.h>
#include "DisplayHardware/Hal.h"
#include "TimeStats/TimeStats.h"
namespace android::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;
using PowerMode = android::hardware::graphics::composer::hal::PowerMode;
public:
// TODO(b/185535769): Inject clock to avoid sleeping in tests.
RefreshRateStats(TimeStats& timeStats, Fps currentRefreshRate)
: mTimeStats(timeStats),
mCurrentRefreshRate(currentRefreshRate),
mCurrentPowerMode(PowerMode::OFF) {}
void setPowerMode(PowerMode mode) {
if (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 setRefreshRate(Fps currRefreshRate) {
if (isApproxEqual(mCurrentRefreshRate, currRefreshRate)) {
return;
}
mTimeStats.incrementRefreshRateSwitches();
flushTime();
mCurrentRefreshRate = currRefreshRate;
}
// Maps stringified refresh rate to total time spent in that mode.
using TotalTimes = ftl::SmallMap<std::string, std::chrono::milliseconds, 3>;
TotalTimes 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();
TotalTimes totalTimes = ftl::init::map("ScreenOff", mScreenOffTime);
// Sum the times for modes that map to the same name, e.g. "60 Hz".
for (const auto& [fps, time] : mFpsTotalTimes) {
const auto string = to_string(fps);
const auto total = std::as_const(totalTimes)
.get(string)
.or_else(ftl::static_ref<std::chrono::milliseconds>([] {
using namespace std::chrono_literals;
return 0ms;
}))
.value();
totalTimes.emplace_or_replace(string, total.get() + time);
}
return totalTimes;
}
// Traverses through the map of config modes and returns how long they've been running in easy
// to read format.
void dump(std::string& result) const {
std::ostringstream stream("+ Refresh rate: running time in seconds\n");
for (const auto& [name, time] : const_cast<RefreshRateStats*>(this)->getTotalTimes()) {
stream << name << ": " << getDateFormatFromMs(time) << '\n';
}
result.append(stream.str());
}
private:
// Calculates the time that passed in ms between the last time we recorded time and the time
// this method was called.
void flushTime() {
const nsecs_t currentTime = systemTime();
const nsecs_t timeElapsed = currentTime - mPreviousRecordedTime;
mPreviousRecordedTime = currentTime;
const auto duration = std::chrono::milliseconds{ns2ms(timeElapsed)};
uint32_t fps = 0;
if (mCurrentPowerMode == PowerMode::ON) {
// Normal power mode is counted under different config modes.
const auto total = std::as_const(mFpsTotalTimes)
.get(mCurrentRefreshRate)
.or_else(ftl::static_ref<std::chrono::milliseconds>([] {
using namespace std::chrono_literals;
return 0ms;
}))
.value();
mFpsTotalTimes.emplace_or_replace(mCurrentRefreshRate, total.get() + duration);
fps = static_cast<uint32_t>(mCurrentRefreshRate.getIntValue());
} else {
mScreenOffTime += duration;
}
mTimeStats.recordRefreshRate(fps, timeElapsed);
}
// Formats the time in milliseconds into easy to read format.
static std::string getDateFormatFromMs(std::chrono::milliseconds time) {
auto [days, dayRemainderMs] = std::div(static_cast<int64_t>(time.count()), 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);
}
// Aggregate refresh rate statistics for telemetry.
TimeStats& mTimeStats;
Fps mCurrentRefreshRate;
PowerMode mCurrentPowerMode;
ftl::SmallMap<Fps, std::chrono::milliseconds, 2, FpsApproxEqual> mFpsTotalTimes;
std::chrono::milliseconds mScreenOffTime = std::chrono::milliseconds::zero();
nsecs_t mPreviousRecordedTime = systemTime();
};
} // namespace android::scheduler
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