SF: Adding Scheduler information into dumpsys
Adding helper classes to keep track of how long we spend in given refresh rates.
We assume that DOZE mode is refresh rate 30 Hz. The other rates we get from the
list of configs stored on the device.
Currently assuming there are up to three modes:
enum class RefreshRateType { POWER_SAVING, DEFAULT, PERFORMANCE };
Test: Tests for the classes coming in next CL.
Bug: 113612090
Change-Id: I6c8226ebdb4bcdffab457121d408500973c7f89e
diff --git a/services/surfaceflinger/Scheduler/RefreshRateStats.h b/services/surfaceflinger/Scheduler/RefreshRateStats.h
new file mode 100644
index 0000000..cd81e4d
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+++ b/services/surfaceflinger/Scheduler/RefreshRateStats.h
@@ -0,0 +1,146 @@
+/*
+ * 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 "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:
+ explicit RefreshRateStats(
+ const std::vector<std::shared_ptr<const HWC2::Display::Config>>& configs)
+ : mRefreshRateConfigs(std::make_unique<RefreshRateConfigs>(configs)),
+ mPreviousRecordedTime(systemTime()) {}
+ ~RefreshRateStats() = default;
+
+ // 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 (auto config : mRefreshRateConfigs->getRefreshRates()) {
+ if (mConfigModesTotalTime.find(config.configId) != mConfigModesTotalTime.end()) {
+ totalTime[config.name] = mConfigModesTotalTime.at(config.configId);
+ }
+ }
+ 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() {
+ std::ostringstream stream;
+ stream << "+ Refresh rate: running time in seconds\n";
+ for (auto stats : getTotalTimes()) {
+ stream << stats.first.c_str() << ": " << getDateFormatFromMs(stats.second) << "\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();
+ int64_t timeElapsedMs = ns2ms(currentTime - mPreviousRecordedTime);
+ mPreviousRecordedTime = currentTime;
+
+ mConfigModesTotalTime[mode] += timeElapsedMs;
+ }
+
+ // 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.
+ std::unique_ptr<RefreshRateConfigs> mRefreshRateConfigs;
+
+ int64_t mCurrentConfigMode = 0;
+ int32_t mCurrentPowerMode = HWC_POWER_MODE_OFF;
+
+ std::unordered_map<int /* power mode */, int64_t /* duration in ms */> mConfigModesTotalTime;
+
+ nsecs_t mPreviousRecordedTime;
+};
+
+} // namespace scheduler
+} // namespace android
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