Enables the use of the blastula pool. (ba4c2eb1) · Commits · e / os / android_frameworks_base

core/java/android/os/Process.java

+2 −2

Original line number	Diff line number	Diff line
		@@ -530,7 +530,7 @@ public class Process {
		return ZYGOTE_PROCESS.start(processClass, niceName, uid, gid, gids,
		runtimeFlags, mountExternal, targetSdkVersion, seInfo,
		abi, instructionSet, appDataDir, invokeWith, packageName,
		packagesForUid, visibleVols, zygoteArgs);
		packagesForUid, visibleVols, /useBlastulaPool=/ true, zygoteArgs);
		}

		/** @hide */
		@@ -551,7 +551,7 @@ public class Process {
		return WebViewZygote.getProcess().start(processClass, niceName, uid, gid, gids,
		runtimeFlags, mountExternal, targetSdkVersion, seInfo,
		abi, instructionSet, appDataDir, invokeWith, packageName,
		packagesForUid, visibleVols, zygoteArgs);
		packagesForUid, visibleVols, /useBlastulaPool=/ false, zygoteArgs);
		}

		/**

core/java/android/os/ZygoteProcess.java

+165 −48

Original line number	Diff line number	Diff line
		@@ -73,6 +73,16 @@ public class ZygoteProcess {
		*/
		public static final String ZYGOTE_SECONDARY_SOCKET_NAME = "zygote_secondary";

		/**
		* @hide for internal use only
		*/
		public static final String BLASTULA_POOL_SOCKET_NAME = "blastula_pool";

		/**
		* @hide for internal use only
		*/
		public static final String BLASTULA_POOL_SECONDARY_SOCKET_NAME = "blastula_pool_secondary";

		/**
		* @hide for internal use only
		*/
		@@ -87,6 +97,15 @@ public class ZygoteProcess {
		* The name of the secondary (alternate ABI) zygote socket.
		*/
		private final LocalSocketAddress mZygoteSecondarySocketAddress;
		/**
		* The name of the socket used to communicate with the primary blastula pool.
		*/
		private final LocalSocketAddress mBlastulaPoolSocketAddress;

		/**
		* The name of the socket used to communicate with the secondary (alternate ABI) blastula pool.
		*/
		private final LocalSocketAddress mBlastulaPoolSecondarySocketAddress;

		public ZygoteProcess() {
		mZygoteSocketAddress =
		@@ -94,12 +113,22 @@ public class ZygoteProcess {
		mZygoteSecondarySocketAddress =
		new LocalSocketAddress(ZYGOTE_SECONDARY_SOCKET_NAME,
		LocalSocketAddress.Namespace.RESERVED);

		mBlastulaPoolSocketAddress =
		new LocalSocketAddress(BLASTULA_POOL_SOCKET_NAME,
		LocalSocketAddress.Namespace.RESERVED);
		mBlastulaPoolSecondarySocketAddress =
		new LocalSocketAddress(BLASTULA_POOL_SECONDARY_SOCKET_NAME,
		LocalSocketAddress.Namespace.RESERVED);
		}

		public ZygoteProcess(LocalSocketAddress primarySocketAddress,
		LocalSocketAddress secondarySocketAddress) {
		mZygoteSocketAddress = primarySocketAddress;
		mZygoteSecondarySocketAddress = secondarySocketAddress;

		mBlastulaPoolSocketAddress = null;
		mBlastulaPoolSecondarySocketAddress = null;
		}

		public LocalSocketAddress getPrimarySocketAddress() {
		@@ -111,6 +140,7 @@ public class ZygoteProcess {
		*/
		public static class ZygoteState {
		final LocalSocketAddress mZygoteSocketAddress;
		final LocalSocketAddress mBlastulaSocketAddress;

		private final LocalSocket mZygoteSessionSocket;

		@@ -122,11 +152,13 @@ public class ZygoteProcess {
		private boolean mClosed;

		private ZygoteState(LocalSocketAddress zygoteSocketAddress,
		LocalSocketAddress blastulaSocketAddress,
		LocalSocket zygoteSessionSocket,
		DataInputStream zygoteInputStream,
		BufferedWriter zygoteOutputWriter,
		List<String> abiList) {
		this.mZygoteSocketAddress = zygoteSocketAddress;
		this.mBlastulaSocketAddress = blastulaSocketAddress;
		this.mZygoteSessionSocket = zygoteSessionSocket;
		this.mZygoteInputStream = zygoteInputStream;
		this.mZygoteOutputWriter = zygoteOutputWriter;
		@@ -134,14 +166,17 @@ public class ZygoteProcess {
		}

		/**
		* Create a new ZygoteState object by connecting to the given Zygote socket.
		* Create a new ZygoteState object by connecting to the given Zygote socket and saving the
		* given blastula socket address.
		*
		* @param zygoteSocketAddress Zygote socket to connect to
		* @param blastulaSocketAddress Blastula socket address to save for later
		* @return A new ZygoteState object containing a session socket for the given Zygote socket
		* address
		* @throws IOException
		*/
		public static ZygoteState connect(LocalSocketAddress zygoteSocketAddress)
		public static ZygoteState connect(LocalSocketAddress zygoteSocketAddress,
		LocalSocketAddress blastulaSocketAddress)
		throws IOException {

		DataInputStream zygoteInputStream = null;
		@@ -154,7 +189,7 @@ public class ZygoteProcess {
		zygoteOutputWriter =
		new BufferedWriter(
		new OutputStreamWriter(zygoteSessionSocket.getOutputStream()),
		256);
		Zygote.SOCKET_BUFFER_SIZE);
		} catch (IOException ex) {
		try {
		zygoteSessionSocket.close();
		@@ -163,11 +198,18 @@ public class ZygoteProcess {
		throw ex;
		}

		return new ZygoteState(zygoteSocketAddress,
		return new ZygoteState(zygoteSocketAddress, blastulaSocketAddress,
		zygoteSessionSocket, zygoteInputStream, zygoteOutputWriter,
		getAbiList(zygoteOutputWriter, zygoteInputStream));
		}

		LocalSocket getBlastulaSessionSocket() throws IOException {
		final LocalSocket blastulaSessionSocket = new LocalSocket();
		blastulaSessionSocket.connect(this.mBlastulaSocketAddress);

		return blastulaSessionSocket;
		}

		boolean matches(String abi) {
		return mABIList.contains(abi);
		}
		@@ -269,12 +311,13 @@ public class ZygoteProcess {
		@Nullable String packageName,
		@Nullable String[] packagesForUid,
		@Nullable String[] visibleVols,
		boolean useBlastulaPool,
		@Nullable String[] zygoteArgs) {
		try {
		return startViaZygote(processClass, niceName, uid, gid, gids,
		runtimeFlags, mountExternal, targetSdkVersion, seInfo,
		abi, instructionSet, appDataDir, invokeWith, /startChildZygote=/false,
		packageName, packagesForUid, visibleVols, zygoteArgs);
		packageName, packagesForUid, visibleVols, useBlastulaPool, zygoteArgs);
		} catch (ZygoteStartFailedEx ex) {
		Log.e(LOG_TAG,
		"Starting VM process through Zygote failed");
		@@ -322,14 +365,12 @@ public class ZygoteProcess {
		*/
		@GuardedBy("mLock")
		private static Process.ProcessStartResult zygoteSendArgsAndGetResult(
		ZygoteState zygoteState, ArrayList<String> args)
		ZygoteState zygoteState, boolean useBlastulaPool, ArrayList<String> args)
		throws ZygoteStartFailedEx {
		try {
		// Throw early if any of the arguments are malformed. This means we can
		// avoid writing a partial response to the zygote.
		int sz = args.size();
		for (int i = 0; i < sz; i++) {
		if (args.get(i).indexOf('\n') >= 0) {
		for (String arg : args) {
		if (arg.indexOf('\n') >= 0) {
		throw new ZygoteStartFailedEx("embedded newlines not allowed");
		}
		}
		@@ -344,37 +385,108 @@ public class ZygoteProcess {
		* the child or -1 on failure, followed by boolean to
		* indicate whether a wrapper process was used.
		*/
		final BufferedWriter writer = zygoteState.mZygoteOutputWriter;
		final DataInputStream inputStream = zygoteState.mZygoteInputStream;
		String msgStr = Integer.toString(args.size()) + "\n"
		+ String.join("\n", args) + "\n";

		writer.write(Integer.toString(args.size()));
		writer.newLine();
		// Should there be a timeout on this?
		Process.ProcessStartResult result = new Process.ProcessStartResult();

		for (int i = 0; i < sz; i++) {
		String arg = args.get(i);
		writer.write(arg);
		writer.newLine();
		// TODO (chriswailes): Move branch body into separate function.
		if (useBlastulaPool && Zygote.BLASTULA_POOL_ENABLED && isValidBlastulaCommand(args)) {
		LocalSocket blastulaSessionSocket = null;

		try {
		blastulaSessionSocket = zygoteState.getBlastulaSessionSocket();

		final BufferedWriter blastulaWriter =
		new BufferedWriter(
		new OutputStreamWriter(blastulaSessionSocket.getOutputStream()),
		Zygote.SOCKET_BUFFER_SIZE);
		final DataInputStream blastulaReader =
		new DataInputStream(blastulaSessionSocket.getInputStream());

		blastulaWriter.write(msgStr);
		blastulaWriter.flush();

		result.pid = blastulaReader.readInt();
		// Blastulas can't be used to spawn processes that need wrappers.
		result.usingWrapper = false;

		if (result.pid < 0) {
		throw new ZygoteStartFailedEx("Blastula specialization failed");
		}

		writer.flush();
		return result;
		} catch (IOException ex) {
		// If there was an IOException using the blastula pool we will log the error and
		// attempt to start the process through the Zygote.
		Log.e(LOG_TAG, "IO Exception while communicating with blastula pool - "
		+ ex.toString());
		} finally {
		try {
		blastulaSessionSocket.close();
		} catch (IOException ex) {
		Log.e(LOG_TAG, "Failed to close blastula session socket: " + ex.getMessage());
		}
		}
		}

		// Should there be a timeout on this?
		Process.ProcessStartResult result = new Process.ProcessStartResult();
		try {
		final BufferedWriter zygoteWriter = zygoteState.mZygoteOutputWriter;
		final DataInputStream zygoteInputStream = zygoteState.mZygoteInputStream;

		zygoteWriter.write(msgStr);
		zygoteWriter.flush();

		// Always read the entire result from the input stream to avoid leaving
		// bytes in the stream for future process starts to accidentally stumble
		// upon.
		result.pid = inputStream.readInt();
		result.usingWrapper = inputStream.readBoolean();
		result.pid = zygoteInputStream.readInt();
		result.usingWrapper = zygoteInputStream.readBoolean();
		} catch (IOException ex) {
		zygoteState.close();
		Log.e(LOG_TAG, "IO Exception while communicating with Zygote - "
		+ ex.toString());
		throw new ZygoteStartFailedEx(ex);
		}

		if (result.pid < 0) {
		throw new ZygoteStartFailedEx("fork() failed");
		}

		return result;
		} catch (IOException ex) {
		zygoteState.close();
		throw new ZygoteStartFailedEx(ex);
		}

		/**
		* Flags that may not be passed to a blastula.
		*/
		private static final String[] INVALID_BLASTULA_FLAGS = {
		"--query-abi-list",
		"--get-pid",
		"--preload-default",
		"--preload-package",
		"--preload-app",
		"--start-child-zygote",
		"--set-api-blacklist-exemptions",
		"--hidden-api-log-sampling-rate",
		"--invoke-with"
		};

		/**
		* Tests a command list to see if it is valid to send to a blastula.
		* @param args Zygote/Blastula command arguments
		* @return True if the command can be passed to a blastula; false otherwise
		*/
		private static boolean isValidBlastulaCommand(ArrayList<String> args) {
		for (String flag : args) {
		for (String badFlag : INVALID_BLASTULA_FLAGS) {
		if (flag.startsWith(badFlag)) {
		return false;
		}
		}
		}

		return true;
		}

		/**
		@@ -416,6 +528,7 @@ public class ZygoteProcess {
		@Nullable String packageName,
		@Nullable String[] packagesForUid,
		@Nullable String[] visibleVols,
		boolean useBlastulaPool,
		@Nullable String[] extraArgs)
		throws ZygoteStartFailedEx {
		ArrayList<String> argsForZygote = new ArrayList<String>();
		@@ -522,7 +635,9 @@ public class ZygoteProcess {
		}

		synchronized(mLock) {
		return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote);
		return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi),
		useBlastulaPool,
		argsForZygote);
		}
		}

		@@ -686,7 +801,7 @@ public class ZygoteProcess {
		if (primaryZygoteState == null \|\| primaryZygoteState.isClosed()) {
		try {
		primaryZygoteState =
		ZygoteState.connect(mZygoteSocketAddress);
		ZygoteState.connect(mZygoteSocketAddress, mBlastulaPoolSocketAddress);
		} catch (IOException ioe) {
		throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe);
		}
		@@ -703,7 +818,8 @@ public class ZygoteProcess {
		if (secondaryZygoteState == null \|\| secondaryZygoteState.isClosed()) {
		try {
		secondaryZygoteState =
		ZygoteState.connect(mZygoteSecondarySocketAddress);
		ZygoteState.connect(mZygoteSecondarySocketAddress,
		mBlastulaPoolSecondarySocketAddress);
		} catch (IOException ioe) {
		throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe);
		}
		@@ -820,7 +936,7 @@ public class ZygoteProcess {
		for (int n = 20; n >= 0; n--) {
		try {
		final ZygoteState zs =
		ZygoteState.connect(zygoteSocketAddress);
		ZygoteState.connect(zygoteSocketAddress, null);
		zs.close();
		return;
		} catch (IOException ioe) {
		@@ -884,7 +1000,8 @@ public class ZygoteProcess {
		gids, runtimeFlags, 0 /* mountExternal /, 0 / targetSdkVersion */, seInfo,
		abi, instructionSet, null /* appDataDir /, null / invokeWith */,
		true /* startChildZygote /, null / packageName */,
		null /* packagesForUid /, null / visibleVolumes */, extraArgs);
		null /* packagesForUid /, null / visibleVolumes */,
		false /* useBlastulaPool */, extraArgs);
		} catch (ZygoteStartFailedEx ex) {
		throw new RuntimeException("Starting child-zygote through Zygote failed", ex);
		}

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

+19 −8

Original line number	Diff line number	Diff line
		@@ -117,7 +117,13 @@ public final class Zygote {
		/** Number of bytes sent to the Zygote over blastula pipes or the pool event FD */
		public static final int BLASTULA_MANAGEMENT_MESSAGE_BYTES = 8;

		/** If the blastula pool should be created and used to start applications */
		/**
		* If the blastula pool should be created and used to start applications.
		*
		* Setting this value to false will disable the creation, maintenance, and use of the blastula
		* pool. When the blastula pool is disabled the application lifecycle will be identical to
		* previous versions of Android.
		*/
		public static final boolean BLASTULA_POOL_ENABLED = false;

		/**
		@@ -187,6 +193,11 @@ public final class Zygote {
		// TODO (chriswailes): This must be updated at the same time as sBlastulaPoolMax.
		static int sBlastulaPoolRefillThreshold = (sBlastulaPoolMax / 2);

		/**
		* @hide for internal use only
		*/
		public static final int SOCKET_BUFFER_SIZE = 256;

		private static LocalServerSocket sBlastulaPoolSocket = null;

		/** a prototype instance for a future List.toArray() */
		@@ -234,14 +245,14 @@ public final class Zygote {
		public static int forkAndSpecialize(int uid, int gid, int[] gids, int runtimeFlags,
		int[][] rlimits, int mountExternal, String seInfo, String niceName, int[] fdsToClose,
		int[] fdsToIgnore, boolean startChildZygote, String instructionSet, String appDataDir,
		String packageName, String[] packagesForUid, String[] visibleVolIds) {
		String packageName, String[] packagesForUID, String[] visibleVolIDs) {
		VM_HOOKS.preFork();
		// Resets nice priority for zygote process.
		resetNicePriority();
		int pid = nativeForkAndSpecialize(
		uid, gid, gids, runtimeFlags, rlimits, mountExternal, seInfo, niceName, fdsToClose,
		fdsToIgnore, startChildZygote, instructionSet, appDataDir, packageName,
		packagesForUid, visibleVolIds);
		packagesForUID, visibleVolIDs);
		// Enable tracing as soon as possible for the child process.
		if (pid == 0) {
		Trace.setTracingEnabled(true, runtimeFlags);
		@@ -256,7 +267,7 @@ public final class Zygote {
		private static native int nativeForkAndSpecialize(int uid, int gid, int[] gids,
		int runtimeFlags, int[][] rlimits, int mountExternal, String seInfo, String niceName,
		int[] fdsToClose, int[] fdsToIgnore, boolean startChildZygote, String instructionSet,
		String appDataDir, String packageName, String[] packagesForUid, String[] visibleVolIds);
		String appDataDir, String packageName, String[] packagesForUID, String[] visibleVolIDs);

		/**
		* Specialize a Blastula instance. The current VM must have been started
		@@ -281,12 +292,12 @@ public final class Zygote {
		*/
		public static void specializeBlastula(int uid, int gid, int[] gids, int runtimeFlags,
		int[][] rlimits, int mountExternal, String seInfo, String niceName,
		boolean startChildZygote, String instructionSet, String appDataDir,
		String packageName, String[] packagesForUid, String[] visibleVolIds) {
		boolean startChildZygote, String instructionSet, String appDataDir, String packageName,
		String[] packagesForUID, String[] visibleVolIDs) {

		nativeSpecializeBlastula(uid, gid, gids, runtimeFlags, rlimits, mountExternal, seInfo,
		niceName, startChildZygote, instructionSet, appDataDir,
		packageName, packagesForUid, visibleVolIds);
		packageName, packagesForUID, visibleVolIDs);

		// Enable tracing as soon as possible for the child process.
		Trace.setTracingEnabled(true, runtimeFlags);
		@@ -306,7 +317,7 @@ public final class Zygote {
		private static native void nativeSpecializeBlastula(int uid, int gid, int[] gids,
		int runtimeFlags, int[][] rlimits, int mountExternal, String seInfo, String niceName,
		boolean startChildZygote, String instructionSet, String appDataDir, String packageName,
		String[] packagesForUid, String[] visibleVolIds);
		String[] packagesForUID, String[] visibleVolIDs);

		/**
		* Called to do any initialization before starting an application.

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

+1 −1

Original line number	Diff line number	Diff line
		@@ -242,7 +242,7 @@ class ZygoteConnection {
		fdsToClose[0] = fd.getInt$();
		}

		fd = zygoteServer.getServerSocketFileDescriptor();
		fd = zygoteServer.getZygoteSocketFileDescriptor();

		if (fd != null) {
		fdsToClose[1] = fd.getInt$();

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

+24 −7

Original line number	Diff line number	Diff line
		@@ -269,7 +269,7 @@ public class ZygoteInit {

		try {
		BufferedReader br =
		new BufferedReader(new InputStreamReader(is), 256);
		new BufferedReader(new InputStreamReader(is), Zygote.SOCKET_BUFFER_SIZE);

		int count = 0;
		String line;
		@@ -750,7 +750,7 @@ public class ZygoteInit {
		throw new RuntimeException("Failed to setpgid(0,0)", ex);
		}

		final Runnable caller;
		Runnable caller;
		try {
		// Report Zygote start time to tron unless it is a runtime restart
		if (!"1".equals(SystemProperties.get("sys.boot_completed"))) {
		@@ -786,7 +786,17 @@ public class ZygoteInit {
		throw new RuntimeException("No ABI list supplied.");
		}

		zygoteServer.registerServerSocketFromEnv(socketName);
		// TODO (chriswailes): Wrap these three calls in a helper function?
		final String blastulaSocketName =
		socketName.equals(ZygoteProcess.ZYGOTE_SOCKET_NAME)
		? ZygoteProcess.BLASTULA_POOL_SOCKET_NAME
		: ZygoteProcess.BLASTULA_POOL_SECONDARY_SOCKET_NAME;

		zygoteServer.createZygoteSocket(socketName);
		Zygote.createBlastulaSocket(blastulaSocketName);

		Zygote.getSocketFDs(socketName.equals(ZygoteProcess.ZYGOTE_SOCKET_NAME));

		// In some configurations, we avoid preloading resources and classes eagerly.
		// In such cases, we will preload things prior to our first fork.
		if (!enableLazyPreload) {
		@@ -829,11 +839,18 @@ public class ZygoteInit {
		}
		}

		// If the return value is null then this is the zygote process
		// returning to the normal control flow. If it returns a Runnable
		// object then this is a blastula that has finished specializing.
		caller = Zygote.initBlastulaPool();

		if (caller == null) {
		Log.i(TAG, "Accepting command socket connections");

		// The select loop returns early in the child process after a fork and
		// loops forever in the zygote.
		caller = zygoteServer.runSelectLoop(abiList);
		}
		} catch (Throwable ex) {
		Log.e(TAG, "System zygote died with exception", ex);
		throw ex;