Merge "Add time spent by uid per cpu frequency to batterystats." into oc-dev (5df9c557) · Commits · e / os / android_frameworks_base

core/java/android/os/BatteryStats.java

+91 −0

Original line number	Diff line number	Diff line
		@@ -203,6 +203,8 @@ public abstract class BatteryStats implements Parcelable {
		private static final String APK_DATA = "apk";
		private static final String PROCESS_DATA = "pr";
		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";
		private static final String SENSOR_DATA = "sr";
		private static final String VIBRATOR_DATA = "vib";
		private static final String FOREGROUND_DATA = "fg";
		@@ -264,6 +266,13 @@ public abstract class BatteryStats implements Parcelable {
		private final StringBuilder mFormatBuilder = new StringBuilder(32);
		private final Formatter mFormatter = new Formatter(mFormatBuilder);

		/**
		* Indicates times spent by the uid at each cpu frequency in all process states.
		*
		* Other types might include times spent in foreground, background etc.
		*/
		private final String UID_TIMES_TYPE_ALL = "A";

		/**
		* State for keeping track of counting information.
		*/
		@@ -302,6 +311,24 @@ public abstract class BatteryStats implements Parcelable {
		public abstract void logState(Printer pw, String prefix);
		}

		/**
		* State for keeping track of array of long counting information.
		*/
		public static abstract class LongCounterArray {
		/**
		* Returns the counts associated with this Counter for the
		* selected type of statistics.
		*
		* @param which one of STATS_SINCE_CHARGED, STATS_SINCE_UNPLUGGED, or STATS_CURRENT
		*/
		public abstract long[] getCountsLocked(int which);

		/**
		* Temporary for debugging.
		*/
		public abstract void logState(Printer pw, String prefix);
		}

		/**
		* Container class that aggregates counters for transmit, receive, and idle state of a
		* radio controller.
		@@ -523,6 +550,9 @@ public abstract class BatteryStats implements Parcelable {
		public abstract Timer getBluetoothScanBackgroundTimer();
		public abstract Counter getBluetoothScanResultCounter();

		public abstract long[] getCpuFreqTimes(int which);
		public abstract long[] getScreenOffCpuFreqTimes(int which);

		// Note: the following times are disjoint. They can be added together to find the
		// total time a uid has had any processes running at all.

		@@ -1077,6 +1107,8 @@ public abstract class BatteryStats implements Parcelable {

		public abstract long getNextMaxDailyDeadline();

		public abstract long[] getCpuFreqs();

		public final static class HistoryTag {
		public String string;
		public int uid;
		@@ -3274,6 +3306,15 @@ public abstract class BatteryStats implements Parcelable {
		}
		}

		final long[] cpuFreqs = getCpuFreqs();
		if (cpuFreqs != null) {
		sb.setLength(0);
		for (int i = 0; i < cpuFreqs.length; ++i) {
		sb.append((i == 0 ? "" : ",") + cpuFreqs[i]);
		}
		dumpLine(pw, 0 /* uid */, category, GLOBAL_CPU_FREQ_DATA, sb.toString());
		}

		for (int iu = 0; iu < NU; iu++) {
		final int uid = uidStats.keyAt(iu);
		if (reqUid >= 0 && uid != reqUid) {
		@@ -3506,6 +3547,27 @@ public abstract class BatteryStats implements Parcelable {
		0 /* old cpu power, keep for compatibility */);
		}

		final long[] cpuFreqTimeMs = u.getCpuFreqTimes(which);
		// If total cpuFreqTimes is null, then we don't need to check for screenOffCpuFreqTimes.
		if (cpuFreqTimeMs != null) {
		sb.setLength(0);
		for (int i = 0; i < cpuFreqTimeMs.length; ++i) {
		sb.append((i == 0 ? "" : ",") + cpuFreqTimeMs[i]);
		}
		final long[] screenOffCpuFreqTimeMs = u.getScreenOffCpuFreqTimes(which);
		if (screenOffCpuFreqTimeMs != null) {
		for (int i = 0; i < screenOffCpuFreqTimeMs.length; ++i) {
		sb.append("," + screenOffCpuFreqTimeMs[i]);
		}
		} else {
		for (int i = 0; i < cpuFreqTimeMs.length; ++i) {
		sb.append(",0");
		}
		}
		dumpLine(pw, uid, category, CPU_TIMES_AT_FREQ_DATA, UID_TIMES_TYPE_ALL,
		cpuFreqTimeMs.length, sb.toString());
		}

		final ArrayMap<String, ? extends BatteryStats.Uid.Proc> processStats
		= u.getProcessStats();
		for (int ipr=processStats.size()-1; ipr>=0; ipr--) {
		@@ -4373,6 +4435,16 @@ public abstract class BatteryStats implements Parcelable {
		pw.println(sb.toString());
		}

		final long[] cpuFreqs = getCpuFreqs();
		if (cpuFreqs != null) {
		sb.setLength(0);
		sb.append("CPU freqs:");
		for (int i = 0; i < cpuFreqs.length; ++i) {
		sb.append(" " + cpuFreqs[i]);
		}
		pw.println(sb.toString());
		}

		for (int iu=0; iu<NU; iu++) {
		final int uid = uidStats.keyAt(iu);
		if (reqUid >= 0 && uid != reqUid && uid != Process.SYSTEM_UID) {
		@@ -4835,6 +4907,25 @@ public abstract class BatteryStats implements Parcelable {
		pw.println(sb.toString());
		}

		final long[] cpuFreqTimes = u.getCpuFreqTimes(which);
		if (cpuFreqTimes != null) {
		sb.setLength(0);
		sb.append(" Total cpu time per freq:");
		for (int i = 0; i < cpuFreqTimes.length; ++i) {
		sb.append(" " + cpuFreqTimes[i]);
		}
		pw.println(sb.toString());
		}
		final long[] screenOffCpuFreqTimes = u.getScreenOffCpuFreqTimes(which);
		if (screenOffCpuFreqTimes != null) {
		sb.setLength(0);
		sb.append(" Total screen-off cpu time per freq:");
		for (int i = 0; i < screenOffCpuFreqTimes.length; ++i) {
		sb.append(" " + screenOffCpuFreqTimes[i]);
		}
		pw.println(sb.toString());
		}

		final ArrayMap<String, ? extends BatteryStats.Uid.Proc> processStats
		= u.getProcessStats();
		for (int ipr=processStats.size()-1; ipr>=0; ipr--) {

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

+275 −1

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@

		package com.android.internal.os;

		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.app.ActivityManager;
		import android.bluetooth.BluetoothActivityEnergyInfo;
		@@ -87,6 +88,7 @@ import java.io.IOException;
		import java.io.PrintWriter;
		import java.nio.charset.StandardCharsets;
		import java.util.ArrayList;
		import java.util.Arrays;
		import java.util.Calendar;
		import java.util.HashMap;
		import java.util.Iterator;
		@@ -114,7 +116,7 @@ public class BatteryStatsImpl extends BatteryStats {
		private static final int MAGIC = 0xBA757475; // 'BATSTATS'

		// Current on-disk Parcel version
		private static final int VERSION = 156 + (USE_OLD_HISTORY ? 1000 : 0);
		private static final int VERSION = 157 + (USE_OLD_HISTORY ? 1000 : 0);

		// Maximum number of items we will record in the history.
		private static final int MAX_HISTORY_ITEMS = 2000;
		@@ -149,6 +151,8 @@ public class BatteryStatsImpl extends BatteryStats {

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

		private final KernelMemoryBandwidthStats mKernelMemoryBandwidthStats
		= new KernelMemoryBandwidthStats();
		@@ -570,6 +574,8 @@ public class BatteryStatsImpl extends BatteryStats {

		private final NetworkStats.Entry mTmpNetworkStatsEntry = new NetworkStats.Entry();

		private long[] mCpuFreqs;

		private PowerProfile mPowerProfile;

		/*
		@@ -957,6 +963,131 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		public static class LongSamplingCounterArray extends LongCounterArray implements TimeBaseObs {
		final TimeBase mTimeBase;
		long[] mCounts;
		long[] mLoadedCounts;
		long[] mUnpluggedCounts;
		long[] mPluggedCounts;

		LongSamplingCounterArray(TimeBase timeBase, Parcel in) {
		mTimeBase = timeBase;
		mPluggedCounts = in.createLongArray();
		mCounts = copyArray(mPluggedCounts, mCounts);
		mLoadedCounts = in.createLongArray();
		mUnpluggedCounts = in.createLongArray();
		timeBase.add(this);
		}

		LongSamplingCounterArray(TimeBase timeBase) {
		mTimeBase = timeBase;
		timeBase.add(this);
		}

		public void writeToParcel(Parcel out) {
		out.writeLongArray(mCounts);
		out.writeLongArray(mLoadedCounts);
		out.writeLongArray(mUnpluggedCounts);
		}

		@Override
		public void onTimeStarted(long elapsedRealTime, long baseUptime, long baseRealtime) {
		mUnpluggedCounts = copyArray(mPluggedCounts, mUnpluggedCounts);
		mCounts = copyArray(mPluggedCounts, mCounts);
		}

		@Override
		public void onTimeStopped(long elapsedRealtime, long baseUptime, long baseRealtime) {
		mPluggedCounts = copyArray(mCounts, mPluggedCounts);
		}

		@Override
		public long[] getCountsLocked(int which) {
		long[] val = copyArray(mTimeBase.isRunning() ? mCounts : mPluggedCounts, null);
		if (which == STATS_SINCE_UNPLUGGED) {
		subtract(val, mUnpluggedCounts);
		} else if (which != STATS_SINCE_CHARGED) {
		subtract(val, mLoadedCounts);
		}
		return val;
		}

		@Override
		public void logState(Printer pw, String prefix) {
		pw.println(prefix + "mCounts=" + Arrays.toString(mCounts)
		+ " mLoadedCounts=" + Arrays.toString(mLoadedCounts)
		+ " mUnpluggedCounts=" + Arrays.toString(mUnpluggedCounts)
		+ " mPluggedCounts=" + Arrays.toString(mPluggedCounts));
		}

		void addCountLocked(long[] counts) {
		if (counts == null) {
		return;
		}
		if (mCounts == null) {
		mCounts = new long[counts.length];
		}
		for (int i = 0; i < counts.length; ++i) {
		mCounts[i] += counts[i];
		}
		}

		/**
		* Clear state of this counter.
		*/
		void reset(boolean detachIfReset) {
		fillArray(mCounts, 0);
		fillArray(mLoadedCounts, 0);
		fillArray(mPluggedCounts, 0);
		fillArray(mUnpluggedCounts, 0);
		if (detachIfReset) {
		detach();
		}
		}

		void detach() {
		mTimeBase.remove(this);
		}

		void writeSummaryFromParcelLocked(Parcel out) {
		out.writeLongArray(mCounts);
		}

		void readSummaryFromParcelLocked(Parcel in) {
		mCounts = in.createLongArray();
		mLoadedCounts = copyArray(mCounts, mLoadedCounts);
		mUnpluggedCounts = copyArray(mCounts, mUnpluggedCounts);
		mPluggedCounts = copyArray(mCounts, mPluggedCounts);
		}

		private void fillArray(long[] a, long val) {
		if (a != null) {
		Arrays.fill(a, val);
		}
		}

		private void subtract(@NonNull long[] val, long[] toSubtract) {
		if (toSubtract == null) {
		return;
		}
		for (int i = 0; i < val.length; i++) {
		val[i] -= toSubtract[i];
		}
		}

		private long[] copyArray(long[] src, long[] dest) {
		if (src == null) {
		return null;
		} else {
		if (dest == null) {
		dest = new long[src.length];
		}
		System.arraycopy(src, 0, dest, 0, src.length);
		return dest;
		}
		}
		}

		public static class LongSamplingCounter extends LongCounter implements TimeBaseObs {
		final TimeBase mTimeBase;
		long mCount;
		@@ -5483,6 +5614,9 @@ public class BatteryStatsImpl extends BatteryStats {
		LongSamplingCounter mSystemCpuTime;
		LongSamplingCounter[][] mCpuClusterSpeed;

		LongSamplingCounterArray mCpuFreqTimeMs;
		LongSamplingCounterArray mScreenOffCpuFreqTimeMs;

		/**
		* The statistics we have collected for this uid's wake locks.
		*/
		@@ -5559,6 +5693,42 @@ public class BatteryStatsImpl extends BatteryStats {
		mProcessStateTimer = new StopwatchTimer[NUM_PROCESS_STATE];
		}

		@Override
		public long[] getCpuFreqTimes(int which) {
		if (mCpuFreqTimeMs == null) {
		return null;
		}
		final long[] cpuFreqTimes = mCpuFreqTimeMs.getCountsLocked(which);
		if (cpuFreqTimes == null) {
		return null;
		}
		// Return cpuFreqTimes only if atleast one of the elements in non-zero.
		for (int i = 0; i < cpuFreqTimes.length; ++i) {
		if (cpuFreqTimes[i] != 0) {
		return cpuFreqTimes;
		}
		}
		return null;
		}

		@Override
		public long[] getScreenOffCpuFreqTimes(int which) {
		if (mScreenOffCpuFreqTimeMs == null) {
		return null;
		}
		final long[] cpuFreqTimes = mScreenOffCpuFreqTimeMs.getCountsLocked(which);
		if (cpuFreqTimes == null) {
		return null;
		}
		// Return cpuFreqTimes only if atleast one of the elements in non-zero.
		for (int i = 0; i < cpuFreqTimes.length; ++i) {
		if (cpuFreqTimes[i] != 0) {
		return cpuFreqTimes;
		}
		}
		return null;
		}

		@Override
		public ArrayMap<String, ? extends BatteryStats.Uid.Wakelock> getWakelockStats() {
		return mWakelockStats.getMap();
		@@ -6354,6 +6524,13 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		if (mCpuFreqTimeMs != null) {
		mCpuFreqTimeMs.reset(false);
		}
		if (mScreenOffCpuFreqTimeMs != null) {
		mScreenOffCpuFreqTimeMs.reset(false);
		}

		resetLongCounterIfNotNull(mMobileRadioApWakeupCount, false);
		resetLongCounterIfNotNull(mWifiRadioApWakeupCount, false);

		@@ -6523,6 +6700,13 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		if (mCpuFreqTimeMs != null) {
		mCpuFreqTimeMs.detach();
		}
		if (mScreenOffCpuFreqTimeMs != null) {
		mScreenOffCpuFreqTimeMs.detach();
		}

		detachLongCounterIfNotNull(mMobileRadioApWakeupCount);
		detachLongCounterIfNotNull(mWifiRadioApWakeupCount);
		}
		@@ -6739,6 +6923,19 @@ public class BatteryStatsImpl extends BatteryStats {
		out.writeInt(0);
		}

		if (mCpuFreqTimeMs != null) {
		out.writeInt(1);
		mCpuFreqTimeMs.writeToParcel(out);
		} else {
		out.writeInt(0);
		}
		if (mScreenOffCpuFreqTimeMs != null) {
		out.writeInt(1);
		mScreenOffCpuFreqTimeMs.writeToParcel(out);
		} else {
		out.writeInt(0);
		}

		if (mMobileRadioApWakeupCount != null) {
		out.writeInt(1);
		mMobileRadioApWakeupCount.writeToParcel(out);
		@@ -6986,6 +7183,18 @@ public class BatteryStatsImpl extends BatteryStats {
		mCpuClusterSpeed = null;
		}

		if (in.readInt() != 0) {
		mCpuFreqTimeMs = new LongSamplingCounterArray(mBsi.mOnBatteryTimeBase, in);
		} else {
		mCpuFreqTimeMs = null;
		}
		if (in.readInt() != 0) {
		mScreenOffCpuFreqTimeMs = new LongSamplingCounterArray(
		mBsi.mOnBatteryScreenOffTimeBase, in);
		} else {
		mScreenOffCpuFreqTimeMs = null;
		}

		if (in.readInt() != 0) {
		mMobileRadioApWakeupCount = new LongSamplingCounter(mBsi.mOnBatteryTimeBase, in);
		} else {
		@@ -8192,6 +8401,10 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		public long[] getCpuFreqs() {
		return mCpuFreqs;
		}

		public BatteryStatsImpl(File systemDir, Handler handler, ExternalStatsSync externalSync) {
		this(new SystemClocks(), systemDir, handler, externalSync, null);
		}
		@@ -9812,6 +10025,8 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		});

		readKernelUidCpuFreqTimesLocked();

		final long elapse = (mClocks.elapsedRealtime() - startTimeMs);
		if (DEBUG_ENERGY_CPU \|\| (elapse >= 100)) {
		Slog.d(TAG, "Reading cpu stats took " + elapse + " ms");
		@@ -9900,6 +10115,30 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		void readKernelUidCpuFreqTimesLocked() {
		mKernelUidCpuFreqTimeReader.readDelta(!mOnBatteryInternal ? null :
		new KernelUidCpuFreqTimeReader.Callback() {
		@Override
		public void onCpuFreqs(long[] cpuFreqs) {
		mCpuFreqs = cpuFreqs;
		}

		@Override
		public void onUidCpuFreqTime(int uid, long[] cpuFreqTimeMs) {
		final Uid u = getUidStatsLocked(uid);
		if (u.mCpuFreqTimeMs == null) {
		u.mCpuFreqTimeMs = new LongSamplingCounterArray(mOnBatteryTimeBase);
		}
		u.mCpuFreqTimeMs.addCountLocked(cpuFreqTimeMs);
		if (u.mScreenOffCpuFreqTimeMs == null) {
		u.mScreenOffCpuFreqTimeMs = new LongSamplingCounterArray(
		mOnBatteryScreenOffTimeBase);
		}
		u.mScreenOffCpuFreqTimeMs.addCountLocked(cpuFreqTimeMs);
		}
		});
		}

		boolean setChargingLocked(boolean charging) {
		if (mCharging != charging) {
		mCharging = charging;
		@@ -10988,6 +11227,8 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		mCpuFreqs = in.createLongArray();

		final int NU = in.readInt();
		if (NU > 10000) {
		throw new ParcelFormatException("File corrupt: too many uids " + NU);
		@@ -11110,6 +11351,20 @@ public class BatteryStatsImpl extends BatteryStats {
		u.mCpuClusterSpeed = null;
		}

		if (in.readInt() != 0) {
		u.mCpuFreqTimeMs = new LongSamplingCounterArray(mOnBatteryTimeBase);
		u.mCpuFreqTimeMs.readSummaryFromParcelLocked(in);
		} else {
		u.mCpuFreqTimeMs = null;
		}
		if (in.readInt() != 0) {
		u.mScreenOffCpuFreqTimeMs = new LongSamplingCounterArray(
		mOnBatteryScreenOffTimeBase);
		u.mScreenOffCpuFreqTimeMs.readSummaryFromParcelLocked(in);
		} else {
		u.mScreenOffCpuFreqTimeMs = null;
		}

		if (in.readInt() != 0) {
		u.mMobileRadioApWakeupCount = new LongSamplingCounter(mOnBatteryTimeBase);
		u.mMobileRadioApWakeupCount.readSummaryFromParcelLocked(in);
		@@ -11360,6 +11615,8 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		out.writeLongArray(mCpuFreqs);

		final int NU = mUidStats.size();
		out.writeInt(NU);
		for (int iu = 0; iu < NU; iu++) {
		@@ -11504,6 +11761,19 @@ public class BatteryStatsImpl extends BatteryStats {
		out.writeInt(0);
		}

		if (u.mCpuFreqTimeMs != null) {
		out.writeInt(1);
		u.mCpuFreqTimeMs.writeSummaryFromParcelLocked(out);
		} else {
		out.writeInt(0);
		}
		if (u.mScreenOffCpuFreqTimeMs != null) {
		out.writeInt(1);
		u.mScreenOffCpuFreqTimeMs.writeSummaryFromParcelLocked(out);
		} else {
		out.writeInt(0);
		}

		if (u.mMobileRadioApWakeupCount != null) {
		out.writeInt(1);
		u.mMobileRadioApWakeupCount.writeSummaryFromParcelLocked(out);
		@@ -11794,6 +12064,8 @@ public class BatteryStatsImpl extends BatteryStats {
		mFlashlightTurnedOnTimers.clear();
		mCameraTurnedOnTimers.clear();

		mCpuFreqs = in.createLongArray();

		int numUids = in.readInt();
		mUidStats.clear();
		for (int i = 0; i < numUids; i++) {
		@@ -11953,6 +12225,8 @@ public class BatteryStatsImpl extends BatteryStats {
		}
		}

		out.writeLongArray(mCpuFreqs);

		if (inclUids) {
		int size = mUidStats.size();
		out.writeInt(size);

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

0 → 100644

+117 −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.annotation.Nullable;
		import android.util.Slog;
		import android.util.SparseArray;

		import com.android.internal.annotations.VisibleForTesting;

		import java.io.BufferedReader;
		import java.io.FileReader;
		import java.io.IOException;

		/**
		* Reads /proc/uid_time_in_state which has the format:
		*
		* uid: [freq1] [freq2] [freq3] ...
		* [uid1]: [time in freq1] [time in freq2] [time in freq3] ...
		* [uid2]: [time in freq1] [time in freq2] [time in freq3] ...
		* ...
		*
		* This provides the times a UID's processes spent executing at each different cpu frequency.
		* The file contains a monotonically increasing count of time for a single boot. This class
		* maintains the previous results of a call to {@link #readDelta} in order to provide a proper
		* delta.
		*/
		public class KernelUidCpuFreqTimeReader {
		private static final String TAG = "KernelUidCpuFreqTimeReader";
		private static final String UID_TIMES_PROC_FILE = "/proc/uid_time_in_state";

		public interface Callback {
		void onCpuFreqs(long[] cpuFreqs);
		void onUidCpuFreqTime(int uid, long[] cpuFreqTimeMs);
		}

		private long[] mCpuFreqs;
		private int mCpuFreqsCount;

		private SparseArray<long[]> mLastUidCpuFreqTimeMs = new SparseArray<>();

		public void readDelta(@Nullable Callback callback) {
		try (BufferedReader reader = new BufferedReader(new FileReader(UID_TIMES_PROC_FILE))) {
		readDelta(reader, callback);
		} catch (IOException e) {
		Slog.e(TAG, "Failed to read " + UID_TIMES_PROC_FILE + ": " + e);
		}
		}

		@VisibleForTesting
		public void readDelta(BufferedReader reader, @Nullable Callback callback) throws IOException {
		String line = reader.readLine();
		if (line == null) {
		return;
		}
		readCpuFreqs(line, callback);
		while ((line = reader.readLine()) != null) {
		final int index = line.indexOf(' ');
		final int uid = Integer.parseInt(line.substring(0, index - 1), 10);
		readTimesForUid(uid, line.substring(index + 1, line.length()), callback);
		}
		}

		private void readTimesForUid(int uid, String line, Callback callback) {
		long[] uidTimeMs = mLastUidCpuFreqTimeMs.get(uid);
		if (uidTimeMs == null) {
		uidTimeMs = new long[mCpuFreqsCount];
		mLastUidCpuFreqTimeMs.put(uid, uidTimeMs);
		}
		final String[] timesStr = line.split(" ");
		final int size = timesStr.length;
		if (size != uidTimeMs.length) {
		Slog.e(TAG, "No. of readings don't match cpu freqs, readings: " + size
		+ " cpuFreqsCount: " + uidTimeMs.length);
		return;
		}
		final long[] deltaUidTimeMs = new long[size];
		for (int i = 0; i < size; ++i) {
		// Times read will be in units of 10ms
		final long totalTimeMs = Long.parseLong(timesStr[i], 10) * 10;
		deltaUidTimeMs[i] = totalTimeMs - uidTimeMs[i];
		uidTimeMs[i] = totalTimeMs;
		}
		if (callback != null) {
		callback.onUidCpuFreqTime(uid, deltaUidTimeMs);
		}
		}

		private void readCpuFreqs(String line, Callback callback) {
		if (mCpuFreqs == null) {
		final String[] freqStr = line.split(" ");
		// First item would be "uid:" which needs to be ignored
		mCpuFreqsCount = freqStr.length - 1;
		mCpuFreqs = new long[mCpuFreqsCount];
		for (int i = 0; i < mCpuFreqsCount; ++i) {
		mCpuFreqs[i] = Long.parseLong(freqStr[i + 1], 10);
		}
		}
		if (callback != null) {
		callback.onCpuFreqs(mCpuFreqs);
		}
		}
		}

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

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