Clean up KernelCpuThreadReader (3989eb02) · Commits · e / os / android_frameworks_base

apct-tests/perftests/core/src/android/os/KernelCpuThreadReaderPerfTest.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -47,7 +47,7 @@ public class KernelCpuThreadReaderPerfTest {
		final BenchmarkState state = mPerfStatusReporter.getBenchmarkState();
		assertNotNull(mKernelCpuThreadReader);
		while (state.keepRunning()) {
		this.mKernelCpuThreadReader.getCurrentProcessCpuUsage();
		this.mKernelCpuThreadReader.getProcessCpuUsage();
		}
		}
		}

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

+116 −182

Original line number	Diff line number	Diff line
		@@ -32,15 +32,18 @@ import java.util.ArrayList;
		import java.util.function.Predicate;

		/**
		* Given a process, will iterate over the child threads of the process, and return the CPU usage
		* statistics for each child thread. The CPU usage statistics contain the amount of time spent in a
		* frequency band.
		* Iterates over processes, and all threads owned by those processes, and return the CPU usage for
		* each thread. The CPU usage statistics contain the amount of time spent in a frequency band. CPU
		* usage is collected using {@link ProcTimeInStateReader}.
		*
		* <p>We only collect CPU data for processes and threads that are owned by certain UIDs. These UIDs
		* are configured via {@link #setUidPredicate}.
		*
		* <p>Frequencies are bucketed together to reduce the amount of data created. This means that we
		* return less frequencies than provided by {@link ProcTimeInStateReader}. The number of
		* frequencies is configurable by {@link #setNumBuckets}. Frequencies are reported as the lowest
		* frequency in that range. Frequencies are spread as evenly as possible across the buckets. The
		* buckets do not cross over the little/big frequencies reported.
		* return less frequencies than provided by {@link ProcTimeInStateReader}. The number of frequencies
		* is configurable by {@link #setNumBuckets}. Frequencies are reported as the lowest frequency in
		* that range. Frequencies are spread as evenly as possible across the buckets. The buckets do not
		* cross over the little/big frequencies reported.
		*
		* <p>N.B.: In order to bucket across little/big frequencies correctly, we assume that the {@code
		* time_in_state} file contains every little core frequency in ascending order, followed by every
		@@ -60,56 +63,39 @@ public class KernelCpuThreadReader {
		private static final String CPU_STATISTICS_FILENAME = "time_in_state";

		/**
		* The name of the file to read process command line invocation from, must be found in
		* {@code /proc/$PID/}
		* The name of the file to read process command line invocation from, must be found in {@code
		* /proc/$PID/}
		*/
		private static final String PROCESS_NAME_FILENAME = "cmdline";

		/**
		* The name of the file to read thread name from, must be found in
		* {@code /proc/$PID/task/$TID}
		* The name of the file to read thread name from, must be found in {@code /proc/$PID/task/$TID}
		*/
		private static final String THREAD_NAME_FILENAME = "comm";

		/**
		* Glob pattern for the process directory names under {@code proc}
		*/
		/** Glob pattern for the process directory names under {@code proc} */
		private static final String PROCESS_DIRECTORY_FILTER = "[0-9]*";

		/**
		* Default process name when the name can't be read
		*/
		/** Default process name when the name can't be read */
		private static final String DEFAULT_PROCESS_NAME = "unknown_process";

		/**
		* Default thread name when the name can't be read
		*/
		/** Default thread name when the name can't be read */
		private static final String DEFAULT_THREAD_NAME = "unknown_thread";

		/**
		* Default mount location of the {@code proc} filesystem
		*/
		/** Default mount location of the {@code proc} filesystem */
		private static final Path DEFAULT_PROC_PATH = Paths.get("/proc");

		/**
		* The initial {@code time_in_state} file for {@link ProcTimeInStateReader}
		*/
		/** The initial {@code time_in_state} file for {@link ProcTimeInStateReader} */
		private static final Path DEFAULT_INITIAL_TIME_IN_STATE_PATH =
		DEFAULT_PROC_PATH.resolve("self/time_in_state");

		/**
		* Value returned when there was an error getting an integer ID value (e.g. PID, UID)
		*/
		/** Value returned when there was an error getting an integer ID value (e.g. PID, UID) */
		private static final int ID_ERROR = -1;

		/**
		* Thread ID used when reporting CPU used by other threads
		*/
		/** Thread ID used when reporting CPU used by other threads */
		private static final int OTHER_THREADS_ID = -1;

		/**
		* Thread name used when reporting CPU used by other threads
		*/
		/** Thread name used when reporting CPU used by other threads */
		private static final String OTHER_THREADS_NAME = "__OTHER_THREADS";

		/**
		@@ -124,9 +110,7 @@ public class KernelCpuThreadReader {
		*/
		private int mMinimumTotalCpuUsageMillis;

		/**
		* Where the proc filesystem is mounted
		*/
		/** Where the proc filesystem is mounted */
		private final Path mProcPath;

		/**
		@@ -135,14 +119,10 @@ public class KernelCpuThreadReader {
		*/
		private int[] mFrequenciesKhz;

		/**
		* Used to read and parse {@code time_in_state} files
		*/
		/** Used to read and parse {@code time_in_state} files */
		private final ProcTimeInStateReader mProcTimeInStateReader;

		/**
		* Used to sort frequencies and usage times into buckets
		*/
		/** Used to sort frequencies and usage times into buckets */
		private FrequencyBucketCreator mFrequencyBucketCreator;

		private final Injector mInjector;
		@@ -150,8 +130,7 @@ public class KernelCpuThreadReader {
		/**
		* Create with a path where `proc` is mounted. Used primarily for testing
		*
		* @param procPath where `proc` is mounted (to find, see {@code mount \| grep
		* ^proc})
		* @param procPath where `proc` is mounted (to find, see {@code mount \| grep ^proc})
		* @param initialTimeInStatePath where the initial {@code time_in_state} file exists to define
		* format
		*/
		@@ -162,7 +141,8 @@ public class KernelCpuThreadReader {
		int minimumTotalCpuUsageMillis,
		Path procPath,
		Path initialTimeInStatePath,
		Injector injector) throws IOException {
		Injector injector)
		throws IOException {
		mUidPredicate = uidPredicate;
		mMinimumTotalCpuUsageMillis = minimumTotalCpuUsageMillis;
		mProcPath = procPath;
		@@ -205,7 +185,7 @@ public class KernelCpuThreadReader {
		* #setUidPredicate}.
		*/
		@Nullable
		public ArrayList<ProcessCpuUsage> getProcessCpuUsageByUids() {
		public ArrayList<ProcessCpuUsage> getProcessCpuUsage() {
		if (DEBUG) {
		Slog.d(TAG, "Reading CPU thread usages for processes owned by UIDs");
		}
		@@ -231,7 +211,7 @@ public class KernelCpuThreadReader {
		}
		}
		} catch (IOException e) {
		Slog.w("Failed to iterate over process paths", e);
		Slog.w(TAG, "Failed to iterate over process paths", e);
		return null;
		}

		@@ -248,13 +228,46 @@ public class KernelCpuThreadReader {
		}

		/**
		* Read all of the CPU usage statistics for each child thread of the current process
		*
		* @return process CPU usage containing usage of all child threads
		* Get the CPU frequencies that correspond to the times reported in {@link
		* ThreadCpuUsage#usageTimesMillis}
		*/
		@Nullable
		public ProcessCpuUsage getCurrentProcessCpuUsage() {
		return getProcessCpuUsage(mProcPath.resolve("self"), mInjector.myPid(), mInjector.myUid());
		public int[] getCpuFrequenciesKhz() {
		return mFrequenciesKhz;
		}

		/** Set the number of frequency buckets to use */
		void setNumBuckets(int numBuckets) {
		if (numBuckets < 1) {
		Slog.w(TAG, "Number of buckets must be at least 1, but was " + numBuckets);
		return;
		}
		// If `numBuckets` hasn't changed since the last set, do nothing
		if (mFrequenciesKhz != null && mFrequenciesKhz.length == numBuckets) {
		return;
		}
		mFrequencyBucketCreator =
		new FrequencyBucketCreator(mProcTimeInStateReader.getFrequenciesKhz(), numBuckets);
		mFrequenciesKhz =
		mFrequencyBucketCreator.getBucketMinFrequencies(
		mProcTimeInStateReader.getFrequenciesKhz());
		}

		/** Set the UID predicate for {@link #getProcessCpuUsage} */
		void setUidPredicate(Predicate<Integer> uidPredicate) {
		mUidPredicate = uidPredicate;
		}

		/**
		* If a thread has strictly less than {@code minimumTotalCpuUsageMillis} total CPU usage, it
		* will not be reported
		*/
		void setMinimumTotalCpuUsageMillis(int minimumTotalCpuUsageMillis) {
		if (minimumTotalCpuUsageMillis < 0) {
		Slog.w(TAG, "Negative minimumTotalCpuUsageMillis: " + minimumTotalCpuUsageMillis);
		return;
		}
		mMinimumTotalCpuUsageMillis = minimumTotalCpuUsageMillis;
		}

		/**
		@@ -269,9 +282,14 @@ public class KernelCpuThreadReader {
		@Nullable
		private ProcessCpuUsage getProcessCpuUsage(Path processPath, int processId, int uid) {
		if (DEBUG) {
		Slog.d(TAG, "Reading CPU thread usages with directory " + processPath
		+ " process ID " + processId
		+ " and user ID " + uid);
		Slog.d(
		TAG,
		"Reading CPU thread usages with directory "
		+ processPath
		+ " process ID "
		+ processId
		+ " and user ID "
		+ uid);
		}

		int[] filteredThreadsCpuUsage = null;
		@@ -305,64 +323,15 @@ public class KernelCpuThreadReader {

		// Add the filtered out thread CPU usage under an "other threads" ThreadCpuUsage
		if (filteredThreadsCpuUsage != null) {
		threadCpuUsages.add(new ThreadCpuUsage(
		threadCpuUsages.add(
		new ThreadCpuUsage(
		OTHER_THREADS_ID, OTHER_THREADS_NAME, filteredThreadsCpuUsage));
		}

		if (DEBUG) {
		Slog.d(TAG, "Read CPU usage of " + threadCpuUsages.size() + " threads");
		}
		return new ProcessCpuUsage(
		processId,
		getProcessName(processPath),
		uid,
		threadCpuUsages);
		}

		/**
		* Set the number of frequency buckets to use
		*/
		void setNumBuckets(int numBuckets) {
		if (numBuckets < 1) {
		Slog.w(TAG, "Number of buckets must be at least 1, but was " + numBuckets);
		return;
		}
		// If `numBuckets` hasn't changed since the last set, do nothing
		if (mFrequenciesKhz != null && mFrequenciesKhz.length == numBuckets) {
		return;
		}
		mFrequencyBucketCreator = new FrequencyBucketCreator(
		mProcTimeInStateReader.getFrequenciesKhz(), numBuckets);
		mFrequenciesKhz = mFrequencyBucketCreator.getBucketMinFrequencies(
		mProcTimeInStateReader.getFrequenciesKhz());
		}

		/**
		* Set the UID predicate for {@link #getProcessCpuUsageByUids}
		*/
		void setUidPredicate(Predicate<Integer> uidPredicate) {
		mUidPredicate = uidPredicate;
		}

		/**
		* If a thread has strictly less than {@code minimumTotalCpuUsageMillis} total CPU usage, it
		* will not be reported
		*/
		void setMinimumTotalCpuUsageMillis(int minimumTotalCpuUsageMillis) {
		if (minimumTotalCpuUsageMillis < 0) {
		Slog.w(TAG, "Negative minimumTotalCpuUsageMillis: " + minimumTotalCpuUsageMillis);
		return;
		}
		mMinimumTotalCpuUsageMillis = minimumTotalCpuUsageMillis;
		}

		/**
		* Get the CPU frequencies that correspond to the times reported in
		* {@link ThreadCpuUsage#usageTimesMillis}
		*/
		@Nullable
		public int[] getCpuFrequenciesKhz() {
		return mFrequenciesKhz;
		return new ProcessCpuUsage(processId, getProcessName(processPath), uid, threadCpuUsages);
		}

		/**
		@@ -398,27 +367,21 @@ public class KernelCpuThreadReader {
		return new ThreadCpuUsage(threadId, threadName, cpuUsages);
		}

		/**
		* Get the command used to start a process
		*/
		/** Get the command used to start a process */
		private String getProcessName(Path processPath) {
		final Path processNamePath = processPath.resolve(PROCESS_NAME_FILENAME);

		final String processName =
		ProcStatsUtil.readSingleLineProcFile(processNamePath.toString());
		final String processName = ProcStatsUtil.readSingleLineProcFile(processNamePath.toString());
		if (processName != null) {
		return processName;
		}
		return DEFAULT_PROCESS_NAME;
		}

		/**
		* Get the name of a thread, given the {@code /proc} path of the thread
		*/
		/** Get the name of a thread, given the {@code /proc} path of the thread */
		private String getThreadName(Path threadPath) {
		final Path threadNamePath = threadPath.resolve(THREAD_NAME_FILENAME);
		final String threadName =
		ProcStatsUtil.readNullSeparatedFile(threadNamePath.toString());
		final String threadName = ProcStatsUtil.readNullSeparatedFile(threadNamePath.toString());
		if (threadName == null) {
		return DEFAULT_THREAD_NAME;
		}
		@@ -441,9 +404,8 @@ public class KernelCpuThreadReader {
		}
		}

		/**
		* Get the sum of all CPU usage across all frequencies
		*/
		/** Get the sum of all CPU usage across all frequencies */
		@SuppressWarnings("ForLoopReplaceableByForEach")
		private static int totalCpuUsage(int[] cpuUsage) {
		int total = 0;
		for (int i = 0; i < cpuUsage.length; i++) {
		@@ -452,9 +414,7 @@ public class KernelCpuThreadReader {
		return total;
		}

		/**
		* Add two CPU frequency usages together
		*/
		/** Add two CPU frequency usages together */
		private static int[] sumCpuUsage(int[] a, int[] b) {
		int[] summed = new int[a.length];
		for (int i = 0; i < a.length; i++) {
		@@ -463,9 +423,7 @@ public class KernelCpuThreadReader {
		return summed;
		}

		/**
		* Puts frequencies and usage times into buckets
		*/
		/** Puts frequencies and usage times into buckets */
		@VisibleForTesting
		public static class FrequencyBucketCreator {
		private final int mNumBuckets;
		@@ -502,20 +460,20 @@ public class KernelCpuThreadReader {

		// Ensure that we don't have more buckets than frequencies
		mLittleNumBuckets = Math.min(littleNumBuckets, mBigFrequenciesStartIndex);
		mBigNumBuckets = Math.min(
		bigNumBuckets, frequencies.length - mBigFrequenciesStartIndex);
		mBigNumBuckets =
		Math.min(bigNumBuckets, frequencies.length - mBigFrequenciesStartIndex);
		mNumBuckets = mLittleNumBuckets + mBigNumBuckets;

		// Set the size of each little and big bucket. If they have no buckets, the size is zero
		mLittleBucketSize = mLittleNumBuckets == 0 ? 0 :
		mBigFrequenciesStartIndex / mLittleNumBuckets;
		mBigBucketSize = mBigNumBuckets == 0 ? 0 :
		(frequencies.length - mBigFrequenciesStartIndex) / mBigNumBuckets;
		mLittleBucketSize =
		mLittleNumBuckets == 0 ? 0 : mBigFrequenciesStartIndex / mLittleNumBuckets;
		mBigBucketSize =
		mBigNumBuckets == 0
		? 0
		: (frequencies.length - mBigFrequenciesStartIndex) / mBigNumBuckets;
		}

		/**
		* Find the index where frequencies change from little core to big core
		*/
		/** Find the index where frequencies change from little core to big core */
		@VisibleForTesting
		public static int getBigFrequenciesStartIndex(long[] frequenciesKhz) {
		for (int i = 0; i < frequenciesKhz.length - 1; i++) {
		@@ -527,9 +485,7 @@ public class KernelCpuThreadReader {
		return frequenciesKhz.length;
		}

		/**
		* Get the minimum frequency in each bucket
		*/
		/** Get the minimum frequency in each bucket */
		@VisibleForTesting
		public int[] getBucketMinFrequencies(long[] frequenciesKhz) {
		Preconditions.checkArgument(frequenciesKhz.length == mNumFrequencies);
		@@ -561,6 +517,7 @@ public class KernelCpuThreadReader {
		* @return the bucketed usage times
		*/
		@VisibleForTesting
		@SuppressWarnings("ForLoopReplaceableByForEach")
		public int[] getBucketedValues(long[] values) {
		Preconditions.checkArgument(values.length == mNumFrequencies);
		final int[] bucketed = new int[mNumBuckets];
		@@ -580,8 +537,10 @@ public class KernelCpuThreadReader {
		}
		// Initialize the big buckets
		for (int i = mBigFrequenciesStartIndex; i < values.length; i++) {
		final int bucketIndex = Math.min(
		mLittleNumBuckets + (i - mBigFrequenciesStartIndex) / mBigBucketSize,
		final int bucketIndex =
		Math.min(
		mLittleNumBuckets
		+ (i - mBigFrequenciesStartIndex) / mBigBucketSize,
		mNumBuckets - 1);
		bucketed[bucketIndex] += values[i];
		}
		@@ -589,9 +548,7 @@ public class KernelCpuThreadReader {
		}
		}

		/**
		* CPU usage of a process
		*/
		/** CPU usage of a process */
		public static class ProcessCpuUsage {
		public final int processId;
		public final String processName;
		@@ -610,46 +567,23 @@ public class KernelCpuThreadReader {
		}
		}

		/**
		* CPU usage of a thread
		*/
		/** CPU usage of a thread */
		public static class ThreadCpuUsage {
		public final int threadId;
		public final String threadName;
		public final int[] usageTimesMillis;

		ThreadCpuUsage(
		int threadId,
		String threadName,
		int[] usageTimesMillis) {
		ThreadCpuUsage(int threadId, String threadName, int[] usageTimesMillis) {
		this.threadId = threadId;
		this.threadName = threadName;
		this.usageTimesMillis = usageTimesMillis;
		}
		}

		/**
		* Used to inject static methods from {@link Process}
		*/
		/** Used to inject static methods from {@link Process} */
		@VisibleForTesting
		public static class Injector {
		/**
		* Get the PID of the current process
		*/
		public int myPid() {
		return Process.myPid();
		}

		/**
		* Get the UID that owns the current process
		*/
		public int myUid() {
		return Process.myUid();
		}

		/**
		* Get the UID for the process with ID {@code pid}
		*/
		/** Get the UID for the process with ID {@code pid} */
		public int getUidForPid(int pid) {
		return Process.getUidForPid(pid);
		}

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

+39 −40

Original line number	Diff line number	Diff line
		@@ -47,33 +47,29 @@ import java.util.regex.Pattern;
		public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		private static final String TAG = "KernelCpuThreadReaderSettingsObserver";

		/**
		* The number of frequency buckets to report
		*/
		/** The number of frequency buckets to report */
		private static final String NUM_BUCKETS_SETTINGS_KEY = "num_buckets";

		private static final int NUM_BUCKETS_DEFAULT = 8;

		/**
		* List of UIDs to report data for
		*/
		/** List of UIDs to report data for */
		private static final String COLLECTED_UIDS_SETTINGS_KEY = "collected_uids";

		private static final String COLLECTED_UIDS_DEFAULT = "0-0;1000-1000";

		/**
		* Minimum total CPU usage to report
		*/
		/** Minimum total CPU usage to report */
		private static final String MINIMUM_TOTAL_CPU_USAGE_MILLIS_SETTINGS_KEY =
		"minimum_total_cpu_usage_millis";

		private static final int MINIMUM_TOTAL_CPU_USAGE_MILLIS_DEFAULT = 10000;

		private final Context mContext;

		@Nullable
		private final KernelCpuThreadReader mKernelCpuThreadReader;
		@Nullable private final KernelCpuThreadReader mKernelCpuThreadReader;

		/**
		* @return returns a created {@link KernelCpuThreadReader} that will be modified by any
		* change in settings, returns null if creation failed
		* @return returns a created {@link KernelCpuThreadReader} that will be modified by any change
		* in settings, returns null if creation failed
		*/
		@Nullable
		public static KernelCpuThreadReader getSettingsModifiedReader(Context context) {
		@@ -81,9 +77,9 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		KernelCpuThreadReaderSettingsObserver settingsObserver =
		new KernelCpuThreadReaderSettingsObserver(context);
		// Register the observer to listen for setting changes
		Uri settingsUri =
		Settings.Global.getUriFor(Settings.Global.KERNEL_CPU_THREAD_READER);
		context.getContentResolver().registerContentObserver(
		Uri settingsUri = Settings.Global.getUriFor(Settings.Global.KERNEL_CPU_THREAD_READER);
		context.getContentResolver()
		.registerContentObserver(
		settingsUri, false, settingsObserver, UserHandle.USER_SYSTEM);
		// Return the observer's reader
		return settingsObserver.mKernelCpuThreadReader;
		@@ -92,7 +88,8 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		private KernelCpuThreadReaderSettingsObserver(Context context) {
		super(BackgroundThread.getHandler());
		mContext = context;
		mKernelCpuThreadReader = KernelCpuThreadReader.create(
		mKernelCpuThreadReader =
		KernelCpuThreadReader.create(
		NUM_BUCKETS_DEFAULT,
		UidPredicate.fromString(COLLECTED_UIDS_DEFAULT),
		MINIMUM_TOTAL_CPU_USAGE_MILLIS_DEFAULT);
		@@ -103,9 +100,7 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		updateReader();
		}

		/**
		* Update the reader with new settings
		*/
		/** Update the reader with new settings */
		private void updateReader() {
		if (mKernelCpuThreadReader == null) {
		return;
		@@ -113,8 +108,10 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {

		final KeyValueListParser parser = new KeyValueListParser(',');
		try {
		parser.setString(Settings.Global.getString(
		mContext.getContentResolver(), Settings.Global.KERNEL_CPU_THREAD_READER));
		parser.setString(
		Settings.Global.getString(
		mContext.getContentResolver(),
		Settings.Global.KERNEL_CPU_THREAD_READER));
		} catch (IllegalArgumentException e) {
		Slog.e(TAG, "Bad settings", e);
		return;
		@@ -122,7 +119,8 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {

		final UidPredicate uidPredicate;
		try {
		uidPredicate = UidPredicate.fromString(
		uidPredicate =
		UidPredicate.fromString(
		parser.getString(COLLECTED_UIDS_SETTINGS_KEY, COLLECTED_UIDS_DEFAULT));
		} catch (NumberFormatException e) {
		Slog.w(TAG, "Failed to get UID predicate", e);
		@@ -132,14 +130,13 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		mKernelCpuThreadReader.setNumBuckets(
		parser.getInt(NUM_BUCKETS_SETTINGS_KEY, NUM_BUCKETS_DEFAULT));
		mKernelCpuThreadReader.setUidPredicate(uidPredicate);
		mKernelCpuThreadReader.setMinimumTotalCpuUsageMillis(parser.getInt(
		mKernelCpuThreadReader.setMinimumTotalCpuUsageMillis(
		parser.getInt(
		MINIMUM_TOTAL_CPU_USAGE_MILLIS_SETTINGS_KEY,
		MINIMUM_TOTAL_CPU_USAGE_MILLIS_DEFAULT));
		}

		/**
		* Check whether a UID belongs to a set of UIDs
		*/
		/** Check whether a UID belongs to a set of UIDs */
		@VisibleForTesting
		public static class UidPredicate implements Predicate<Integer> {
		private static final Pattern UID_RANGE_PATTERN = Pattern.compile("([0-9]+)-([0-9]+)");
		@@ -150,8 +147,8 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		* Create a UID predicate from a string representing a list of UID ranges
		*
		* <p>UID ranges are a pair of integers separated by a '-'. If you want to specify a single
		* UID (e.g. UID 1000), you can use {@code 1000-1000}. Lists of ranges are separated by
		* a single ';'. For example, this would be a valid string representation: {@code
		* UID (e.g. UID 1000), you can use {@code 1000-1000}. Lists of ranges are separated by a
		* single ';'. For example, this would be a valid string representation: {@code
		* "1000-1999;2003-2003;2004-2004;2050-2060"}.
		*
		* <p>We do not use ',' to delimit as it is already used in separating different setting
		@@ -169,7 +166,8 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		throw new NumberFormatException(
		"Failed to recognize as number range: " + uidSpecifier);
		}
		acceptedUidRanges.add(Range.create(
		acceptedUidRanges.add(
		Range.create(
		Integer.parseInt(uidRangeMatcher.group(1)),
		Integer.parseInt(uidRangeMatcher.group(2))));
		}
		@@ -181,6 +179,7 @@ public class KernelCpuThreadReaderSettingsObserver extends ContentObserver {
		}

		@Override
		@SuppressWarnings("ForLoopReplaceableByForEach")
		public boolean test(Integer uid) {
		for (int i = 0; i < mAcceptedUidRanges.size(); i++) {
		if (mAcceptedUidRanges.get(i).contains(uid)) {

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

+11 −6

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

+24 −101

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