Merge "Merge changes I54d54f24,I0c384eb3 into oc-mr1-dev am: e332629667 am: 065f4b7ea7" (674912c6) · Commits · e / os / android_frameworks_base

core/java/android/os/BatteryStats.java

+84 −10

Original line number	Diff line number	Diff line
		@@ -53,6 +53,8 @@ public abstract class BatteryStats implements Parcelable {
		private static final String TAG = "BatteryStats";

		private static final boolean LOCAL_LOGV = false;
		/** Fetching RPM stats is too slow to do each time screen changes, so disable it. */
		protected static final boolean SCREEN_OFF_RPM_STATS_ENABLED = false;

		/** @hide */
		public static final String SERVICE_NAME = "batterystats";
		@@ -213,8 +215,10 @@ public abstract class BatteryStats implements Parcelable {
		* - Fixed bugs in background timers and BLE scan time
		* New in version 25:
		* - Package wakeup alarms are now on screen-off timebase
		* New in version 26:
		* - Resource power manager (rpm) states [but screenOffRpm is disabled from working properly]
		*/
		static final String CHECKIN_VERSION = "25";
		static final String CHECKIN_VERSION = "26";

		/**
		* Old version, we hit 9 and ran out of room, need to remove.
		@@ -233,6 +237,10 @@ public abstract class BatteryStats implements Parcelable {
		private static final String CPU_DATA = "cpu";
		private static final String GLOBAL_CPU_FREQ_DATA = "gcf";
		private static final String CPU_TIMES_AT_FREQ_DATA = "ctf";
		// rpm line is:
		// BATTERY_STATS_CHECKIN_VERSION, uid, which, "rpm", state/voter name, total time, total count,
		// screen-off time, screen-off count
		private static final String RESOURCE_POWER_MANAGER_DATA = "rpm";
		private static final String SENSOR_DATA = "sr";
		private static final String VIBRATOR_DATA = "vib";
		private static final String FOREGROUND_ACTIVITY_DATA = "fg";
		@@ -2648,6 +2656,16 @@ public abstract class BatteryStats implements Parcelable {

		public abstract Map<String, ? extends Timer> getKernelWakelockStats();

		/**
		* Returns Timers tracking the total time of each Resource Power Manager state and voter.
		*/
		public abstract Map<String, ? extends Timer> getRpmStats();
		/**
		* Returns Timers tracking the screen-off time of each Resource Power Manager state and voter.
		*/
		public abstract Map<String, ? extends Timer> getScreenOffRpmStats();


		public abstract LongSparseArray<? extends Timer> getKernelMemoryStats();

		public abstract void writeToParcelWithoutUids(Parcel out, int flags);
		@@ -3309,6 +3327,30 @@ public abstract class BatteryStats implements Parcelable {
		}
		}

		final Map<String, ? extends Timer> rpmStats = getRpmStats();
		final Map<String, ? extends Timer> screenOffRpmStats = getScreenOffRpmStats();
		if (rpmStats.size() > 0) {
		for (Map.Entry<String, ? extends Timer> ent : rpmStats.entrySet()) {
		sb.setLength(0);
		Timer totalTimer = ent.getValue();
		long timeMs = (totalTimer.getTotalTimeLocked(rawRealtime, which) + 500) / 1000;
		int count = totalTimer.getCountLocked(which);
		Timer screenOffTimer = screenOffRpmStats.get(ent.getKey());
		long screenOffTimeMs = screenOffTimer != null
		? (screenOffTimer.getTotalTimeLocked(rawRealtime, which) + 500) / 1000 : 0;
		int screenOffCount = screenOffTimer != null
		? screenOffTimer.getCountLocked(which) : 0;
		if (SCREEN_OFF_RPM_STATS_ENABLED) {
		dumpLine(pw, 0 /* uid */, category, RESOURCE_POWER_MANAGER_DATA,
		"\"" + ent.getKey() + "\"", timeMs, count, screenOffTimeMs,
		screenOffCount);
		} else {
		dumpLine(pw, 0 /* uid */, category, RESOURCE_POWER_MANAGER_DATA,
		"\"" + ent.getKey() + "\"", timeMs, count);
		}
		}
		}

		final BatteryStatsHelper helper = new BatteryStatsHelper(context, false, wifiOnly);
		helper.create(this);
		helper.refreshStats(which, UserHandle.USER_ALL);
		@@ -4570,6 +4612,7 @@ public abstract class BatteryStats implements Parcelable {
		}

		final LongSparseArray<? extends Timer> mMemoryStats = getKernelMemoryStats();
		if (mMemoryStats.size() > 0) {
		pw.println(" Memory Stats");
		for (int i = 0; i < mMemoryStats.size(); i++) {
		sb.setLength(0);
		@@ -4579,6 +4622,36 @@ public abstract class BatteryStats implements Parcelable {
		sb.append(mMemoryStats.valueAt(i).getTotalTimeLocked(rawRealtime, which));
		pw.println(sb.toString());
		}
		pw.println();
		}

		final Map<String, ? extends Timer> rpmStats = getRpmStats();
		if (rpmStats.size() > 0) {
		pw.print(prefix); pw.println(" Resource Power Manager Stats");
		if (rpmStats.size() > 0) {
		for (Map.Entry<String, ? extends Timer> ent : rpmStats.entrySet()) {
		final String timerName = ent.getKey();
		final Timer timer = ent.getValue();
		printTimer(pw, sb, timer, rawRealtime, which, prefix, timerName);
		}
		}
		pw.println();
		}
		if (SCREEN_OFF_RPM_STATS_ENABLED) {
		final Map<String, ? extends Timer> screenOffRpmStats = getScreenOffRpmStats();
		if (screenOffRpmStats.size() > 0) {
		pw.print(prefix);
		pw.println(" Resource Power Manager Stats for when screen was off");
		if (screenOffRpmStats.size() > 0) {
		for (Map.Entry<String, ? extends Timer> ent : screenOffRpmStats.entrySet()) {
		final String timerName = ent.getKey();
		final Timer timer = ent.getValue();
		printTimer(pw, sb, timer, rawRealtime, which, prefix, timerName);
		}
		}
		pw.println();
		}
		}

		final long[] cpuFreqs = getCpuFreqs();
		if (cpuFreqs != null) {
		@@ -4588,6 +4661,7 @@ public abstract class BatteryStats implements Parcelable {
		sb.append(" " + cpuFreqs[i]);
		}
		pw.println(sb.toString());
		pw.println();
		}

		for (int iu=0; iu<NU; iu++) {

core/java/com/android/internal/os/BatteryStatsImpl.java

+201 −2

Original line number	Diff line number	Diff line
		@@ -119,7 +119,7 @@ public class BatteryStatsImpl extends BatteryStats {
		private static final int MAGIC = 0xBA757475; // 'BATSTATS'

		// Current on-disk Parcel version
		private static final int VERSION = 165 + (USE_OLD_HISTORY ? 1000 : 0);
		private static final int VERSION = 166 + (USE_OLD_HISTORY ? 1000 : 0);

		// Maximum number of items we will record in the history.
		private static final int MAX_HISTORY_ITEMS;
		@@ -195,6 +195,9 @@ public class BatteryStatsImpl extends BatteryStats {
		return mKernelMemoryStats;
		}

		/** Temporary container for Resource Power Manager stats. */
		private final RpmStats mTmpRpmStats = new RpmStats();

		public interface BatteryCallback {
		public void batteryNeedsCpuUpdate();
		public void batteryPowerChanged(boolean onBattery);
		@@ -202,6 +205,7 @@ public class BatteryStatsImpl extends BatteryStats {
		}

		public interface PlatformIdleStateCallback {
		public void fillLowPowerStats(RpmStats rpmStats);
		public String getPlatformLowPowerStats();
		public String getSubsystemLowPowerStats();
		}
		@@ -279,7 +283,8 @@ public class BatteryStatsImpl extends BatteryStats {
		int UPDATE_WIFI = 0x02;
		int UPDATE_RADIO = 0x04;
		int UPDATE_BT = 0x08;
		int UPDATE_ALL = UPDATE_CPU \| UPDATE_WIFI \| UPDATE_RADIO \| UPDATE_BT;
		int UPDATE_RPM = 0x10; // 16
		int UPDATE_ALL = UPDATE_CPU \| UPDATE_WIFI \| UPDATE_RADIO \| UPDATE_BT \| UPDATE_RPM;

		Future<?> scheduleSync(String reason, int flags);
		Future<?> scheduleCpuSyncDueToRemovedUid(int uid);
		@@ -627,6 +632,25 @@ public class BatteryStatsImpl extends BatteryStats {
		@VisibleForTesting
		protected PowerProfile mPowerProfile;

		/*
		* Holds a SamplingTimer associated with each Resource Power Manager state and voter,
		* recording their times when on-battery (regardless of screen state).
		*/
		private final HashMap<String, SamplingTimer> mRpmStats = new HashMap<>();
		/** Times for each Resource Power Manager state and voter when screen-off and on-battery. */
		private final HashMap<String, SamplingTimer> mScreenOffRpmStats = new HashMap<>();

		@Override
		public Map<String, ? extends Timer> getRpmStats() {
		return mRpmStats;
		}

		// TODO: Note: screenOffRpmStats has been disabled via SCREEN_OFF_RPM_STATS_ENABLED.
		@Override
		public Map<String, ? extends Timer> getScreenOffRpmStats() {
		return mScreenOffRpmStats;
		}

		/*
		* Holds a SamplingTimer associated with each kernel wakelock name being tracked.
		*/
		@@ -2648,6 +2672,26 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		/** Get Resource Power Manager stats. Create a new one if it doesn't already exist. */
		public SamplingTimer getRpmTimerLocked(String name) {
		SamplingTimer rpmt = mRpmStats.get(name);
		if (rpmt == null) {
		rpmt = new SamplingTimer(mClocks, mOnBatteryTimeBase);
		mRpmStats.put(name, rpmt);
		}
		return rpmt;
		}

		/** Get Screen-off Resource Power Manager stats. Create new one if it doesn't already exist. */
		public SamplingTimer getScreenOffRpmTimerLocked(String name) {
		SamplingTimer rpmt = mScreenOffRpmStats.get(name);
		if (rpmt == null) {
		rpmt = new SamplingTimer(mClocks, mOnBatteryScreenOffTimeBase);
		mScreenOffRpmStats.put(name, rpmt);
		}
		return rpmt;
		}

		/*
		* Get the wakeup reason counter, and create a new one if one
		* doesn't already exist.
		@@ -3536,6 +3580,12 @@ public class BatteryStatsImpl extends BatteryStats {
		updateKernelWakelocksLocked();
		updateBatteryPropertiesLocked();
		}
		// This if{} is only necessary due to SCREEN_OFF_RPM_STATS_ENABLED, which exists because
		// updateRpmStatsLocked is too slow to run each screen change. When the speed is
		// improved, remove the surrounding if{}.
		if (SCREEN_OFF_RPM_STATS_ENABLED \|\| updateOnBatteryTimeBase) {
		updateRpmStatsLocked(); // if either OnBattery or OnBatteryScreenOff timebase changes.
		}
		if (DEBUG_ENERGY_CPU) {
		Slog.d(TAG, "Updating cpu time because screen is now " + (screenOff ? "off" : "on")
		+ " and battery is " + (unplugged ? "on" : "off"));
		@@ -9501,6 +9551,19 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		if (mRpmStats.size() > 0) {
		for (SamplingTimer timer : mRpmStats.values()) {
		mOnBatteryTimeBase.remove(timer);
		}
		mRpmStats.clear();
		}
		if (mScreenOffRpmStats.size() > 0) {
		for (SamplingTimer timer : mScreenOffRpmStats.values()) {
		mOnBatteryScreenOffTimeBase.remove(timer);
		}
		mScreenOffRpmStats.clear();
		}

		if (mKernelWakelockStats.size() > 0) {
		for (SamplingTimer timer : mKernelWakelockStats.values()) {
		mOnBatteryScreenOffTimeBase.remove(timer);
		@@ -10202,6 +10265,55 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		/**
		* Read and record Resource Power Manager state and voter times.
		*/
		public void updateRpmStatsLocked() {
		if (mPlatformIdleStateCallback == null) return;
		mPlatformIdleStateCallback.fillLowPowerStats(mTmpRpmStats);

		for (Map.Entry<String, RpmStats.PowerStatePlatformSleepState> pstate
		: mTmpRpmStats.mPlatformLowPowerStats.entrySet()) {

		// Update values for this platform state.
		final String pName = pstate.getKey();
		final long pTimeUs = pstate.getValue().mTimeMs * 1000;
		final int pCount = pstate.getValue().mCount;
		getRpmTimerLocked(pName).update(pTimeUs, pCount);
		if (SCREEN_OFF_RPM_STATS_ENABLED) {
		getScreenOffRpmTimerLocked(pName).update(pTimeUs, pCount);
		}

		// Update values for each voter of this platform state.
		for (Map.Entry<String, RpmStats.PowerStateElement> voter
		: pstate.getValue().mVoters.entrySet()) {
		final String vName = pName + "." + voter.getKey();
		final long vTimeUs = voter.getValue().mTimeMs * 1000;
		final int vCount = voter.getValue().mCount;
		getRpmTimerLocked(vName).update(vTimeUs, vCount);
		if (SCREEN_OFF_RPM_STATS_ENABLED) {
		getScreenOffRpmTimerLocked(vName).update(vTimeUs, vCount);
		}
		}
		}

		for (Map.Entry<String, RpmStats.PowerStateSubsystem> subsys
		: mTmpRpmStats.mSubsystemLowPowerStats.entrySet()) {

		final String subsysName = subsys.getKey();
		for (Map.Entry<String, RpmStats.PowerStateElement> sstate
		: subsys.getValue().mStates.entrySet()) {
		final String name = subsysName + "." + sstate.getKey();
		final long timeUs = sstate.getValue().mTimeMs * 1000;
		final int count = sstate.getValue().mCount;
		getRpmTimerLocked(name).update(timeUs, count);
		if (SCREEN_OFF_RPM_STATS_ENABLED) {
		getScreenOffRpmTimerLocked(name).update(timeUs, count);
		}
		}
		}
		}

		/**
		* Read and distribute kernel wake lock use across apps.
		*/
		@@ -11725,6 +11837,27 @@ public class BatteryStatsImpl extends BatteryStats {
		mBluetoothScanNesting = 0;
		mBluetoothScanTimer.readSummaryFromParcelLocked(in);

		int NRPMS = in.readInt();
		if (NRPMS > 10000) {
		throw new ParcelFormatException("File corrupt: too many rpm stats " + NRPMS);
		}
		for (int irpm = 0; irpm < NRPMS; irpm++) {
		if (in.readInt() != 0) {
		String rpmName = in.readString();
		getRpmTimerLocked(rpmName).readSummaryFromParcelLocked(in);
		}
		}
		int NSORPMS = in.readInt();
		if (NSORPMS > 10000) {
		throw new ParcelFormatException("File corrupt: too many screen-off rpm stats " + NSORPMS);
		}
		for (int irpm = 0; irpm < NSORPMS; irpm++) {
		if (in.readInt() != 0) {
		String rpmName = in.readString();
		getScreenOffRpmTimerLocked(rpmName).readSummaryFromParcelLocked(in);
		}
		}

		int NKW = in.readInt();
		if (NKW > 10000) {
		throw new ParcelFormatException("File corrupt: too many kernel wake locks " + NKW);
		@@ -12111,6 +12244,29 @@ public class BatteryStatsImpl extends BatteryStats {
		mCameraOnTimer.writeSummaryFromParcelLocked(out, NOWREAL_SYS);
		mBluetoothScanTimer.writeSummaryFromParcelLocked(out, NOWREAL_SYS);

		out.writeInt(mRpmStats.size());
		for (Map.Entry<String, SamplingTimer> ent : mRpmStats.entrySet()) {
		Timer rpmt = ent.getValue();
		if (rpmt != null) {
		out.writeInt(1);
		out.writeString(ent.getKey());
		rpmt.writeSummaryFromParcelLocked(out, NOWREAL_SYS);
		} else {
		out.writeInt(0);
		}
		}
		out.writeInt(mScreenOffRpmStats.size());
		for (Map.Entry<String, SamplingTimer> ent : mScreenOffRpmStats.entrySet()) {
		Timer rpmt = ent.getValue();
		if (rpmt != null) {
		out.writeInt(1);
		out.writeString(ent.getKey());
		rpmt.writeSummaryFromParcelLocked(out, NOWREAL_SYS);
		} else {
		out.writeInt(0);
		}
		}

		out.writeInt(mKernelWakelockStats.size());
		for (Map.Entry<String, SamplingTimer> ent : mKernelWakelockStats.entrySet()) {
		Timer kwlt = ent.getValue();
		@@ -12568,6 +12724,25 @@ public class BatteryStatsImpl extends BatteryStats {
		mDischargeScreenOffCounter = new LongSamplingCounter(mOnBatteryTimeBase, in);
		mLastWriteTime = in.readLong();

		mRpmStats.clear();
		int NRPMS = in.readInt();
		for (int irpm = 0; irpm < NRPMS; irpm++) {
		if (in.readInt() != 0) {
		String rpmName = in.readString();
		SamplingTimer rpmt = new SamplingTimer(mClocks, mOnBatteryTimeBase, in);
		mRpmStats.put(rpmName, rpmt);
		}
		}
		mScreenOffRpmStats.clear();
		int NSORPMS = in.readInt();
		for (int irpm = 0; irpm < NSORPMS; irpm++) {
		if (in.readInt() != 0) {
		String rpmName = in.readString();
		SamplingTimer rpmt = new SamplingTimer(mClocks, mOnBatteryScreenOffTimeBase, in);
		mScreenOffRpmStats.put(rpmName, rpmt);
		}
		}

		mKernelWakelockStats.clear();
		int NKW = in.readInt();
		for (int ikw = 0; ikw < NKW; ikw++) {
		@@ -12731,6 +12906,29 @@ public class BatteryStatsImpl extends BatteryStats {
		mDischargeScreenOffCounter.writeToParcel(out);
		out.writeLong(mLastWriteTime);

		out.writeInt(mRpmStats.size());
		for (Map.Entry<String, SamplingTimer> ent : mRpmStats.entrySet()) {
		SamplingTimer rpmt = ent.getValue();
		if (rpmt != null) {
		out.writeInt(1);
		out.writeString(ent.getKey());
		rpmt.writeToParcel(out, uSecRealtime);
		} else {
		out.writeInt(0);
		}
		}
		out.writeInt(mScreenOffRpmStats.size());
		for (Map.Entry<String, SamplingTimer> ent : mScreenOffRpmStats.entrySet()) {
		SamplingTimer rpmt = ent.getValue();
		if (rpmt != null) {
		out.writeInt(1);
		out.writeString(ent.getKey());
		rpmt.writeToParcel(out, uSecRealtime);
		} else {
		out.writeInt(0);
		}
		}

		if (inclUids) {
		out.writeInt(mKernelWakelockStats.size());
		for (Map.Entry<String, SamplingTimer> ent : mKernelWakelockStats.entrySet()) {
		@@ -12755,6 +12953,7 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}
		} else {
		// TODO: There should be two 0's printed here, not just one.
		out.writeInt(0);
		}

core/java/com/android/internal/os/RpmStats.java

0 → 100644

+112 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2017 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.
		*/
		package com.android.internal.os;

		import android.util.ArrayMap;

		import java.util.Map;

		/**
		* Container for Resource Power Manager states and their data.
		* Values can be populated by the BatteryStatsService.fillLowPowerStats jni function.
		*/
		public final class RpmStats {
		public Map<String, PowerStatePlatformSleepState> mPlatformLowPowerStats = new ArrayMap<>();
		public Map<String, PowerStateSubsystem> mSubsystemLowPowerStats = new ArrayMap<>();

		/**
		* Finds the PowerStatePlatformSleepState with the given name (creating it if it doesn't exist),
		* updates its timeMs and count, and returns it.
		*/
		@SuppressWarnings("unused")
		public PowerStatePlatformSleepState getAndUpdatePlatformState(
		String name, long timeMs, int count) {

		PowerStatePlatformSleepState e = mPlatformLowPowerStats.get(name);
		if (e == null) {
		e = new PowerStatePlatformSleepState();
		mPlatformLowPowerStats.put(name, e);
		}
		e.mTimeMs = timeMs;
		e.mCount = count;
		return e;
		}

		/**
		* Returns the PowerStateSubsystem with the given name (creating it if it doesn't exist).
		*/
		public PowerStateSubsystem getSubsystem(String name) {
		PowerStateSubsystem e = mSubsystemLowPowerStats.get(name);
		if (e == null) {
		e = new PowerStateSubsystem();
		mSubsystemLowPowerStats.put(name, e);
		}
		return e;
		}

		/** Represents a subsystem state or a platform voter. */
		public static class PowerStateElement {
		public long mTimeMs; // totalTimeInMsecVotedForSinceBoot
		public int mCount; // totalNumberOfTimesVotedSinceBoot

		private PowerStateElement(long timeMs, int count) {
		this.mTimeMs = timeMs;
		this.mCount = count;
		}
		}

		/** Represents a PowerStatePlatformSleepState, per hardware/interfaces/power/1.0/types.hal */
		public static class PowerStatePlatformSleepState {
		public long mTimeMs; // residencyInMsecSinceBoot
		public int mCount; // totalTransitions
		public Map<String, PowerStateElement> mVoters = new ArrayMap<>(); // voters for this platform-level sleep state

		/**
		* Updates (creating if necessary) the voter with the given name, with the given timeMs and
		* count.
		*/
		@SuppressWarnings("unused")
		public void putVoter(String name, long timeMs, int count) {
		PowerStateElement e = mVoters.get(name);
		if (e == null) {
		mVoters.put(name, new PowerStateElement(timeMs, count));
		} else {
		e.mTimeMs = timeMs;
		e.mCount = count;
		}
		}
		}

		/** Represents a PowerStateSubsystem, per hardware/interfaces/power/1.1/types.hal */
		public static class PowerStateSubsystem {
		public Map<String, PowerStateElement> mStates = new ArrayMap<>(); // sleep states supported by this susbsystem

		/**
		* Updates (creating if necessary) the subsystem state with the given name, with the given
		* timeMs and count.
		*/
		@SuppressWarnings("unused")
		public void putState(String name, long timeMs, int count) {
		PowerStateElement e = mStates.get(name);
		if (e == null) {
		mStates.put(name, new PowerStateElement(timeMs, count));
		} else {
		e.mTimeMs = timeMs;
		e.mCount = count;
		}
		}
		}
		}

services/core/java/com/android/server/am/BatteryExternalStatsWorker.java

+4 −0

Original line number	Diff line number	Diff line
		@@ -264,6 +264,10 @@ class BatteryExternalStatsWorker implements BatteryStatsImpl.ExternalStatsSync {
		mStats.updateKernelMemoryBandwidthLocked();
		}

		if ((updateFlags & UPDATE_RPM) != 0) {
		mStats.updateRpmStatsLocked();
		}

		if (bluetoothInfo != null) {
		if (bluetoothInfo.isValid()) {
		mStats.updateBluetoothStateLocked(bluetoothInfo);

services/core/java/com/android/server/am/BatteryStatsService.java

+17 −2

Original line number	Diff line number	Diff line
		@@ -49,6 +49,7 @@ import com.android.internal.app.IBatteryStats;
		import com.android.internal.os.BatteryStatsHelper;
		import com.android.internal.os.BatteryStatsImpl;
		import com.android.internal.os.PowerProfile;
		import com.android.internal.os.RpmStats;
		import com.android.internal.util.DumpUtils;
		import com.android.server.LocalServices;
		import com.android.server.power.BatterySaverPolicy.ServiceType;
		@@ -85,6 +86,7 @@ public final class BatteryStatsService extends IBatteryStats.Stub
		private final Context mContext;
		private final BatteryExternalStatsWorker mWorker;

		private native void getLowPowerStats(RpmStats rpmStats);
		private native int getPlatformLowPowerStats(ByteBuffer outBuffer);
		private native int getSubsystemLowPowerStats(ByteBuffer outBuffer);
		private CharsetDecoder mDecoderStat = StandardCharsets.UTF_8
		@@ -96,6 +98,19 @@ public final class BatteryStatsService extends IBatteryStats.Stub
		private CharBuffer mUtf16BufferStat = CharBuffer.allocate(MAX_LOW_POWER_STATS_SIZE);
		private static final int MAX_LOW_POWER_STATS_SIZE = 512;

		/**
		* Replaces the information in the given rpmStats with up-to-date information.
		*/
		@Override
		public void fillLowPowerStats(RpmStats rpmStats) {
		if (DBG) Slog.d(TAG, "begin getLowPowerStats");
		try {
		getLowPowerStats(rpmStats);
		} finally {
		if (DBG) Slog.d(TAG, "end getLowPowerStats");
		}
		}

		@Override
		public String getPlatformLowPowerStats() {
		if (DBG) Slog.d(TAG, "begin getPlatformLowPowerStats");
		@@ -120,7 +135,7 @@ public final class BatteryStatsService extends IBatteryStats.Stub

		@Override
		public String getSubsystemLowPowerStats() {
		Slog.d(TAG, "begin getSubsystemLowPowerStats");
		if (DBG) Slog.d(TAG, "begin getSubsystemLowPowerStats");
		try {
		mUtf8BufferStat.clear();
		mUtf16BufferStat.clear();
		@@ -136,7 +151,7 @@ public final class BatteryStatsService extends IBatteryStats.Stub
		mUtf16BufferStat.flip();
		return mUtf16BufferStat.toString();
		} finally {
		Slog.d(TAG, "end getSubsystemLowPowerStats");
		if (DBG) Slog.d(TAG, "end getSubsystemLowPowerStats");
		}
		}