Refactor BatteryStatsImpl.updateCpuTimeLocked. (3838323d) · Commits · e / os / android_frameworks_base

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

+232 −209

Original line number	Diff line number	Diff line
		@@ -157,6 +157,15 @@ public class BatteryStatsImpl extends BatteryStats {
		// Number of transmit power states the Bluetooth controller can be in.
		private static final int NUM_BT_TX_LEVELS = 1;

		/**
		* Holding a wakelock costs more than just using the cpu.
		* Currently, we assign only half the cpu time to an app that is running but
		* not holding a wakelock. The apps holding wakelocks get the rest of the blame.
		* If no app is holding a wakelock, then the distribution is normal.
		*/
		@VisibleForTesting
		public static final int WAKE_LOCK_WEIGHT = 50;

		protected Clocks mClocks;

		private final JournaledFile mFile;
		@@ -171,9 +180,12 @@ public class BatteryStatsImpl extends BatteryStats {
		private final KernelWakelockReader mKernelWakelockReader = new KernelWakelockReader();
		private final KernelWakelockStats mTmpWakelockStats = new KernelWakelockStats();

		private final KernelUidCpuTimeReader mKernelUidCpuTimeReader = new KernelUidCpuTimeReader();
		private KernelCpuSpeedReader[] mKernelCpuSpeedReaders;
		private final KernelUidCpuFreqTimeReader mKernelUidCpuFreqTimeReader =
		@VisibleForTesting
		protected KernelUidCpuTimeReader mKernelUidCpuTimeReader = new KernelUidCpuTimeReader();
		@VisibleForTesting
		protected KernelCpuSpeedReader[] mKernelCpuSpeedReaders;
		@VisibleForTesting
		protected KernelUidCpuFreqTimeReader mKernelUidCpuFreqTimeReader =
		new KernelUidCpuFreqTimeReader();

		private final KernelMemoryBandwidthStats mKernelMemoryBandwidthStats
		@@ -197,10 +209,12 @@ public class BatteryStatsImpl extends BatteryStats {
		public static abstract class UserInfoProvider {
		private int[] userIds;
		protected abstract @Nullable int[] getUserIds();
		private final void refreshUserIds() {
		@VisibleForTesting
		public final void refreshUserIds() {
		userIds = getUserIds();
		}
		private final boolean exists(int userId) {
		@VisibleForTesting
		public boolean exists(int userId) {
		return userIds != null ? ArrayUtils.contains(userIds, userId) : true;
		}
		}
		@@ -273,7 +287,8 @@ public class BatteryStatsImpl extends BatteryStats {

		public final MyHandler mHandler;
		private ExternalStatsSync mExternalSync = null;
		private UserInfoProvider mUserInfoProvider = null;
		@VisibleForTesting
		protected UserInfoProvider mUserInfoProvider = null;

		private BatteryCallback mCallback;

		@@ -291,7 +306,8 @@ public class BatteryStatsImpl extends BatteryStats {
		// elapsed time by the number of active timers to arrive at that timer's share of the time.
		// In order to do this, we must refresh each timer whenever the number of active timers
		// changes.
		final ArrayList<StopwatchTimer> mPartialTimers = new ArrayList<>();
		@VisibleForTesting
		protected ArrayList<StopwatchTimer> mPartialTimers = new ArrayList<>();
		final ArrayList<StopwatchTimer> mFullTimers = new ArrayList<>();
		final ArrayList<StopwatchTimer> mWindowTimers = new ArrayList<>();
		final ArrayList<StopwatchTimer> mDrawTimers = new ArrayList<>();
		@@ -308,7 +324,8 @@ public class BatteryStatsImpl extends BatteryStats {
		final ArrayList<StopwatchTimer> mBluetoothScanOnTimers = new ArrayList<>();

		// Last partial timers we use for distributing CPU usage.
		final ArrayList<StopwatchTimer> mLastPartialTimers = new ArrayList<>();
		@VisibleForTesting
		protected ArrayList<StopwatchTimer> mLastPartialTimers = new ArrayList<>();

		// These are the objects that will want to do something when the device
		// is unplugged from power.
		@@ -536,7 +553,8 @@ public class BatteryStatsImpl extends BatteryStats {
		* in to power.
		*/
		boolean mOnBattery;
		boolean mOnBatteryInternal;
		@VisibleForTesting
		protected boolean mOnBatteryInternal;

		/**
		* External reporting of whether the device is actually charging.
		@@ -606,7 +624,8 @@ public class BatteryStatsImpl extends BatteryStats {

		private long[] mCpuFreqs;

		private PowerProfile mPowerProfile;
		@VisibleForTesting
		protected PowerProfile mPowerProfile;

		/*
		* Holds a SamplingTimer associated with each kernel wakelock name being tracked.
		@@ -2020,7 +2039,8 @@ public class BatteryStatsImpl extends BatteryStats {
		* For partial wake locks, keep track of whether we are in the list
		* to consume CPU cycles.
		*/
		boolean mInList;
		@VisibleForTesting
		public boolean mInList;

		public StopwatchTimer(Clocks clocks, Uid uid, int type, ArrayList<StopwatchTimer> timerPool,
		TimeBase timeBase, Parcel in) {
		@@ -10262,53 +10282,153 @@ public class BatteryStatsImpl extends BatteryStats {
		Slog.d(TAG, "!Cpu updating!");
		}

		// Holding a wakelock costs more than just using the cpu.
		// Currently, we assign only half the cpu time to an app that is running but
		// not holding a wakelock. The apps holding wakelocks get the rest of the blame.
		// If no app is holding a wakelock, then the distribution is normal.
		final int wakelockWeight = 50;

		int numWakelocks = 0;

		// Calculate how many wakelocks we have to distribute amongst. The system is excluded.
		// Only distribute cpu power to wakelocks if the screen is off and we're on battery.
		final int numPartialTimers = mPartialTimers.size();
		// Calculate the wakelocks we have to distribute amongst. The system is excluded as it is
		// usually holding the wakelock on behalf of an app.
		// And Only distribute cpu power to wakelocks if the screen is off and we're on battery.
		ArrayList<StopwatchTimer> partialTimersToConsider = null;
		if (mOnBatteryScreenOffTimeBase.isRunning()) {
		for (int i = 0; i < numPartialTimers; i++) {
		partialTimersToConsider = new ArrayList<>();
		for (int i = mPartialTimers.size() - 1; i >= 0; --i) {
		final StopwatchTimer timer = mPartialTimers.get(i);
		if (timer.mInList && timer.mUid != null && timer.mUid.mUid != Process.SYSTEM_UID) {
		// Since the collection and blaming of wakelocks can be scheduled to run after
		// some delay, the mPartialTimers list may have new entries. We can't blame
		// the newly added timer for past cpu time, so we only consider timers that
		// were present for one round of collection. Once a timer has gone through
		// a round of collection, its mInList field is set to true.
		numWakelocks++;
		if (timer.mInList && timer.mUid != null && timer.mUid.mUid != Process.SYSTEM_UID) {
		partialTimersToConsider.add(timer);
		}
		}
		}
		markPartialTimersAsEligible();

		final int numWakelocksF = numWakelocks;
		mTempTotalCpuUserTimeUs = 0;
		mTempTotalCpuSystemTimeUs = 0;
		// When the battery is not on, we don't attribute the cpu times to any timers but we still
		// need to take the snapshots.
		if (!mOnBatteryInternal) {
		mKernelUidCpuTimeReader.readDelta(null);
		mKernelUidCpuFreqTimeReader.readDelta(null);
		for (int cluster = mKernelCpuSpeedReaders.length - 1; cluster >= 0; --cluster) {
		mKernelCpuSpeedReaders[cluster].readDelta();
		}
		return;
		}

		mUserInfoProvider.refreshUserIds();
		final SparseLongArray updatedUids = new SparseLongArray();
		readKernelUidCpuTimesLocked(partialTimersToConsider, updatedUids);
		updateClusterSpeedTimes(updatedUids);
		if (updateCpuFreqData) {
		readKernelUidCpuFreqTimesLocked();
		}
		}

		/**
		* Mark the current partial timers as gone through a collection so that they will be
		* considered in the next cpu times distribution to wakelock holders.
		*/
		@VisibleForTesting
		public void markPartialTimersAsEligible() {
		if (ArrayUtils.referenceEquals(mPartialTimers, mLastPartialTimers)) {
		// No difference, so each timer is now considered for the next collection.
		for (int i = mPartialTimers.size() - 1; i >= 0; --i) {
		mPartialTimers.get(i).mInList = true;
		}
		} else {
		// The lists are different, meaning we added (or removed a timer) since the last
		// collection.
		for (int i = mLastPartialTimers.size() - 1; i >= 0; --i) {
		mLastPartialTimers.get(i).mInList = false;
		}
		mLastPartialTimers.clear();

		// Mark the current timers as gone through a collection.
		final int numPartialTimers = mPartialTimers.size();
		for (int i = 0; i < numPartialTimers; ++i) {
		final StopwatchTimer timer = mPartialTimers.get(i);
		timer.mInList = true;
		mLastPartialTimers.add(timer);
		}
		}
		}

		/**
		* Take snapshot of cpu times (aggregated over all uids) at different frequencies and
		* calculate cpu times spent by each uid at different frequencies.
		*
		* @param updatedUids The uids for which times spent at different frequencies are calculated.
		*/
		@VisibleForTesting
		public void updateClusterSpeedTimes(@NonNull SparseLongArray updatedUids) {
		long totalCpuClustersTimeMs = 0;
		// Read the time spent for each cluster at various cpu frequencies.
		final long[][] clusterSpeedTimesMs = new long[mKernelCpuSpeedReaders.length][];
		for (int cluster = 0; cluster < mKernelCpuSpeedReaders.length; cluster++) {
		clusterSpeedTimesMs[cluster] = mKernelCpuSpeedReaders[cluster].readDelta();
		if (clusterSpeedTimesMs[cluster] != null) {
		for (int speed = clusterSpeedTimesMs[cluster].length - 1; speed >= 0; --speed) {
		totalCpuClustersTimeMs += clusterSpeedTimesMs[cluster][speed];
		}
		}
		}
		if (totalCpuClustersTimeMs != 0) {
		// We have cpu times per freq aggregated over all uids but we need the times per uid.
		// So, we distribute total time spent by an uid to different cpu freqs based on the
		// amount of time cpu was running at that freq.
		final int updatedUidsCount = updatedUids.size();
		for (int i = 0; i < updatedUidsCount; ++i) {
		final Uid u = getUidStatsLocked(updatedUids.keyAt(i));
		final long appCpuTimeUs = updatedUids.valueAt(i);
		// Add the cpu speeds to this UID.
		final int numClusters = mPowerProfile.getNumCpuClusters();
		if (u.mCpuClusterSpeedTimesUs == null \|\|
		u.mCpuClusterSpeedTimesUs.length != numClusters) {
		u.mCpuClusterSpeedTimesUs = new LongSamplingCounter[numClusters][];
		}

		for (int cluster = 0; cluster < clusterSpeedTimesMs.length; cluster++) {
		final int speedsInCluster = clusterSpeedTimesMs[cluster].length;
		if (u.mCpuClusterSpeedTimesUs[cluster] == null \|\| speedsInCluster !=
		u.mCpuClusterSpeedTimesUs[cluster].length) {
		u.mCpuClusterSpeedTimesUs[cluster]
		= new LongSamplingCounter[speedsInCluster];
		}

		final LongSamplingCounter[] cpuSpeeds = u.mCpuClusterSpeedTimesUs[cluster];
		for (int speed = 0; speed < speedsInCluster; speed++) {
		if (cpuSpeeds[speed] == null) {
		cpuSpeeds[speed] = new LongSamplingCounter(mOnBatteryTimeBase);
		}
		cpuSpeeds[speed].addCountLocked(appCpuTimeUs
		* clusterSpeedTimesMs[cluster][speed]
		/ totalCpuClustersTimeMs);
		}
		}
		}
		}
		}

		// Read the CPU data for each UID. This will internally generate a snapshot so next time
		// we read, we get a delta. If we are to distribute the cpu time, then do so. Otherwise
		// we just ignore the data.
		/**
		* Take a snapshot of the cpu times spent by each uid and update the corresponding counters.
		* If {@param partialTimers} is not null and empty, then we assign a portion of cpu times to
		* wakelock holders.
		*
		* @param partialTimers The wakelock holders among which the cpu times will be distributed.
		* @param updatedUids If not null, then the uids found in the snapshot will be added to this.
		*/
		@VisibleForTesting
		public void readKernelUidCpuTimesLocked(@Nullable ArrayList<StopwatchTimer> partialTimers,
		@Nullable SparseLongArray updatedUids) {
		mTempTotalCpuUserTimeUs = mTempTotalCpuSystemTimeUs = 0;
		final int numWakelocks = partialTimers == null ? 0 : partialTimers.size();
		final long startTimeMs = mClocks.uptimeMillis();
		mUserInfoProvider.refreshUserIds();
		mKernelUidCpuTimeReader.readDelta(!mOnBatteryInternal ? null :
		new KernelUidCpuTimeReader.Callback() {
		@Override
		public void onUidCpuTime(int uid, long userTimeUs, long systemTimeUs) {

		mKernelUidCpuTimeReader.readDelta((uid, userTimeUs, systemTimeUs) -> {
		uid = mapUid(uid);
		if (Process.isIsolated(uid)) {
		// This could happen if the isolated uid mapping was removed before
		// that process was actually killed.
		// This could happen if the isolated uid mapping was removed before that process
		// was actually killed.
		mKernelUidCpuTimeReader.removeUid(uid);
		Slog.d(TAG, "Got readings for an isolated uid with"
		+ " no mapping to owning uid: " + uid);
		Slog.d(TAG, "Got readings for an isolated uid with no mapping: " + uid);
		return;
		}
		if (!mUserInfoProvider.exists(UserHandle.getUserId(uid))) {
		@@ -10332,12 +10452,12 @@ public class BatteryStatsImpl extends BatteryStats {
		sb.append("\n");
		}

		if (numWakelocksF > 0) {
		if (numWakelocks > 0) {
		// We have wakelocks being held, so only give a portion of the
		// time to the process. The rest will be distributed among wakelock
		// holders.
		userTimeUs = (userTimeUs * wakelockWeight) / 100;
		systemTimeUs = (systemTimeUs * wakelockWeight) / 100;
		userTimeUs = (userTimeUs * WAKE_LOCK_WEIGHT) / 100;
		systemTimeUs = (systemTimeUs * WAKE_LOCK_WEIGHT) / 100;
		}

		if (sb != null) {
		@@ -10350,36 +10470,29 @@ public class BatteryStatsImpl extends BatteryStats {

		u.mUserCpuTime.addCountLocked(userTimeUs);
		u.mSystemCpuTime.addCountLocked(systemTimeUs);
		if (updatedUids != null) {
		updatedUids.put(u.getUid(), userTimeUs + systemTimeUs);
		}
		});

		if (updateCpuFreqData) {
		readKernelUidCpuFreqTimesLocked();
		final long elapsedTimeMs = mClocks.uptimeMillis() - startTimeMs;
		if (DEBUG_ENERGY_CPU \|\| elapsedTimeMs >= 100) {
		Slog.d(TAG, "Reading cpu stats took " + elapsedTimeMs + "ms");
		}

		final long elapse = (mClocks.uptimeMillis() - startTimeMs);
		if (DEBUG_ENERGY_CPU \|\| (elapse >= 100)) {
		Slog.d(TAG, "Reading cpu stats took " + elapse + " ms");
		}

		if (mOnBatteryInternal && numWakelocks > 0) {
		if (numWakelocks > 0) {
		// Distribute a portion of the total cpu time to wakelock holders.
		mTempTotalCpuUserTimeUs = (mTempTotalCpuUserTimeUs * (100 - wakelockWeight)) / 100;
		mTempTotalCpuUserTimeUs = (mTempTotalCpuUserTimeUs * (100 - WAKE_LOCK_WEIGHT)) / 100;
		mTempTotalCpuSystemTimeUs =
		(mTempTotalCpuSystemTimeUs * (100 - wakelockWeight)) / 100;

		for (int i = 0; i < numPartialTimers; i++) {
		final StopwatchTimer timer = mPartialTimers.get(i);
		(mTempTotalCpuSystemTimeUs * (100 - WAKE_LOCK_WEIGHT)) / 100;

		// The system does not share any blame, as it is usually holding the wakelock
		// on behalf of an app.
		if (timer.mInList && timer.mUid != null && timer.mUid.mUid != Process.SYSTEM_UID) {
		int userTimeUs = (int) (mTempTotalCpuUserTimeUs / numWakelocks);
		int systemTimeUs = (int) (mTempTotalCpuSystemTimeUs / numWakelocks);
		for (int i = 0; i < numWakelocks; ++i) {
		final StopwatchTimer timer = partialTimers.get(i);
		final int userTimeUs = (int) (mTempTotalCpuUserTimeUs / (numWakelocks - i));
		final int systemTimeUs = (int) (mTempTotalCpuSystemTimeUs / (numWakelocks - i));

		if (DEBUG_ENERGY_CPU) {
		StringBuilder sb = new StringBuilder();
		final StringBuilder sb = new StringBuilder();
		sb.append(" Distributing wakelock uid=").append(timer.mUid.mUid)
		.append(": u=");
		TimeUtils.formatDuration(userTimeUs / 1000, sb);
		@@ -10390,116 +10503,27 @@ public class BatteryStatsImpl extends BatteryStats {

		timer.mUid.mUserCpuTime.addCountLocked(userTimeUs);
		timer.mUid.mSystemCpuTime.addCountLocked(systemTimeUs);
		if (updatedUids != null) {
		final int uid = timer.mUid.getUid();
		updatedUids.put(uid, updatedUids.get(uid, 0) + userTimeUs + systemTimeUs);
		}

		final Uid.Proc proc = timer.mUid.getProcessStatsLocked("wakelock");
		proc.addCpuTimeLocked(userTimeUs / 1000, systemTimeUs / 1000);

		mTempTotalCpuUserTimeUs -= userTimeUs;
		mTempTotalCpuSystemTimeUs -= systemTimeUs;
		numWakelocks--;
		}
		}

		if (mTempTotalCpuUserTimeUs > 0 \|\| mTempTotalCpuSystemTimeUs > 0) {
		// Anything left over is given to the system.
		if (DEBUG_ENERGY_CPU) {
		StringBuilder sb = new StringBuilder();
		sb.append(" Distributing lost time to system: u=");
		TimeUtils.formatDuration(mTempTotalCpuUserTimeUs / 1000, sb);
		sb.append(" s=");
		TimeUtils.formatDuration(mTempTotalCpuSystemTimeUs / 1000, sb);
		Slog.d(TAG, sb.toString());
		}

		final Uid u = getUidStatsLocked(Process.SYSTEM_UID);
		u.mUserCpuTime.addCountLocked(mTempTotalCpuUserTimeUs);
		u.mSystemCpuTime.addCountLocked(mTempTotalCpuSystemTimeUs);
		updatedUids.put(Process.SYSTEM_UID, updatedUids.get(Process.SYSTEM_UID, 0)
		+ mTempTotalCpuUserTimeUs + mTempTotalCpuSystemTimeUs);

		final Uid.Proc proc = u.getProcessStatsLocked("lost");
		proc.addCpuTimeLocked((int) mTempTotalCpuUserTimeUs / 1000,
		(int) mTempTotalCpuSystemTimeUs / 1000);
		}
		}

		long totalCpuClustersTimeMs = 0;
		// Read the time spent for each cluster at various cpu frequencies.
		final long[][] clusterSpeedTimesMs = new long[mKernelCpuSpeedReaders.length][];
		for (int cluster = 0; cluster < mKernelCpuSpeedReaders.length; cluster++) {
		clusterSpeedTimesMs[cluster] = mKernelCpuSpeedReaders[cluster].readDelta();
		if (clusterSpeedTimesMs[cluster] != null) {
		for (int speed = clusterSpeedTimesMs[cluster].length - 1; speed >= 0; --speed) {
		totalCpuClustersTimeMs += clusterSpeedTimesMs[cluster][speed];
		}
		}
		}
		if (totalCpuClustersTimeMs != 0) {
		// We have cpu times per freq aggregated over all uids but we need the times per uid.
		// So, we distribute total time spent by an uid to different cpu freqs based on the
		// amount of time cpu was running at that freq.
		final int updatedUidsCount = updatedUids.size();
		for (int i = 0; i < updatedUidsCount; ++i) {
		final Uid u = getUidStatsLocked(updatedUids.keyAt(i));
		final long appCpuTimeUs = updatedUids.valueAt(i);
		// Add the cpu speeds to this UID.
		final int numClusters = mPowerProfile.getNumCpuClusters();
		if (u.mCpuClusterSpeedTimesUs == null \|\| u.mCpuClusterSpeedTimesUs.length !=
		numClusters) {
		u.mCpuClusterSpeedTimesUs = new LongSamplingCounter[numClusters][];
		}

		for (int cluster = 0; cluster < clusterSpeedTimesMs.length; cluster++) {
		final int speedsInCluster = clusterSpeedTimesMs[cluster].length;
		if (u.mCpuClusterSpeedTimesUs[cluster] == null \|\| speedsInCluster !=
		u.mCpuClusterSpeedTimesUs[cluster].length) {
		u.mCpuClusterSpeedTimesUs[cluster]
		= new LongSamplingCounter[speedsInCluster];
		}

		final LongSamplingCounter[] cpuSpeeds = u.mCpuClusterSpeedTimesUs[cluster];
		for (int speed = 0; speed < speedsInCluster; speed++) {
		if (cpuSpeeds[speed] == null) {
		cpuSpeeds[speed] = new LongSamplingCounter(mOnBatteryTimeBase);
		}
		cpuSpeeds[speed].addCountLocked(appCpuTimeUs
		* clusterSpeedTimesMs[cluster][speed]
		/ totalCpuClustersTimeMs);
		}
		}
		}
		}

		// See if there is a difference in wakelocks between this collection and the last
		// collection.
		if (ArrayUtils.referenceEquals(mPartialTimers, mLastPartialTimers)) {
		// No difference, so each timer is now considered for the next collection.
		for (int i = 0; i < numPartialTimers; i++) {
		mPartialTimers.get(i).mInList = true;
		}
		} else {
		// The lists are different, meaning we added (or removed a timer) since the last
		// collection.
		final int numLastPartialTimers = mLastPartialTimers.size();
		for (int i = 0; i < numLastPartialTimers; i++) {
		mLastPartialTimers.get(i).mInList = false;
		}
		mLastPartialTimers.clear();

		// Mark the current timers as gone through a collection.
		for (int i = 0; i < numPartialTimers; i++) {
		final StopwatchTimer timer = mPartialTimers.get(i);
		timer.mInList = true;
		mLastPartialTimers.add(timer);
		}
		}
		}

		void readKernelUidCpuFreqTimesLocked() {
		mKernelUidCpuFreqTimeReader.readDelta(!mOnBatteryInternal ? null :
		new KernelUidCpuFreqTimeReader.Callback() {
		/**
		* Take a snapshot of the cpu times spent by each uid in each freq and update the
		* corresponding counters.
		*/
		@VisibleForTesting
		public void readKernelUidCpuFreqTimesLocked() {
		mKernelUidCpuFreqTimeReader.readDelta(new KernelUidCpuFreqTimeReader.Callback() {
		@Override
		public void onCpuFreqs(long[] cpuFreqs) {
		mCpuFreqs = cpuFreqs;
		@@ -10510,12 +10534,11 @@ public class BatteryStatsImpl extends BatteryStats {
		uid = mapUid(uid);
		if (Process.isIsolated(uid)) {
		mKernelUidCpuFreqTimeReader.removeUid(uid);
		Slog.d(TAG, "Got freq readings for an isolated uid with"
		+ " no mapping to owning uid: " + uid);
		Slog.d(TAG, "Got freq readings for an isolated uid with no mapping: " + uid);
		return;
		}
		if (!mUserInfoProvider.exists(UserHandle.getUserId(uid))) {
		Slog.d(TAG, "Got readings for an invalid user's uid " + uid);
		Slog.d(TAG, "Got freq readings for an invalid user's uid " + uid);
		mKernelUidCpuFreqTimeReader.removeUid(uid);
		return;
		}

core/tests/coretests/src/com/android/internal/os/BatteryStatsCpuTimesTest.java

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core/tests/coretests/src/com/android/internal/os/BatteryStatsTests.java

+1 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,7 @@ import org.junit.runners.Suite;

		@RunWith(Suite.class)
		@Suite.SuiteClasses({
		BatteryStatsCpuTimesTest.class,
		BatteryStatsBackgroundStatsTest.class,
		BatteryStatsCounterTest.class,
		BatteryStatsDualTimerTest.class,

core/tests/coretests/src/com/android/internal/os/MockBatteryStatsImpl.java

+42 −0

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