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-rw-r--r--core/java/com/android/internal/os/Zygote.java47
-rw-r--r--core/java/com/android/internal/os/ZygoteConnection.java2
-rw-r--r--core/java/com/android/internal/os/ZygoteInit.java5
-rw-r--r--core/java/com/android/internal/os/ZygoteServer.java331
-rw-r--r--core/jni/com_android_internal_os_Zygote.cpp43
5 files changed, 276 insertions, 152 deletions
diff --git a/core/java/com/android/internal/os/Zygote.java b/core/java/com/android/internal/os/Zygote.java
index 0dc0c7e55b2d..40a378bf21ed 100644
--- a/core/java/com/android/internal/os/Zygote.java
+++ b/core/java/com/android/internal/os/Zygote.java
@@ -172,6 +172,11 @@ public final class Zygote {
*/
public static final int SOCKET_BUFFER_SIZE = 256;
+ /**
+ * @hide for internal use only
+ */
+ private static final int PRIORITY_MAX = -20;
+
/** a prototype instance for a future List.toArray() */
protected static final int[][] INT_ARRAY_2D = new int[0][0];
@@ -236,8 +241,7 @@ public final class Zygote {
int[] fdsToIgnore, boolean startChildZygote, String instructionSet, String appDataDir,
int targetSdkVersion) {
ZygoteHooks.preFork();
- // Resets nice priority for zygote process.
- resetNicePriority();
+
int pid = nativeForkAndSpecialize(
uid, gid, gids, runtimeFlags, rlimits, mountExternal, seInfo, niceName, fdsToClose,
fdsToIgnore, startChildZygote, instructionSet, appDataDir);
@@ -249,6 +253,7 @@ public final class Zygote {
// Note that this event ends at the end of handleChildProc,
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "PostFork");
}
+
ZygoteHooks.postForkCommon();
return pid;
}
@@ -335,15 +340,16 @@ public final class Zygote {
public static int forkSystemServer(int uid, int gid, int[] gids, int runtimeFlags,
int[][] rlimits, long permittedCapabilities, long effectiveCapabilities) {
ZygoteHooks.preFork();
- // Resets nice priority for zygote process.
- resetNicePriority();
+
int pid = nativeForkSystemServer(
uid, gid, gids, runtimeFlags, rlimits,
permittedCapabilities, effectiveCapabilities);
+
// Enable tracing as soon as we enter the system_server.
if (pid == 0) {
Trace.setTracingEnabled(true, runtimeFlags);
}
+
ZygoteHooks.postForkCommon();
return pid;
}
@@ -461,13 +467,16 @@ public final class Zygote {
/**
* Fork a new unspecialized app process from the zygote
*
+ * @param usapPoolSocket The server socket the USAP will call accept on
* @param sessionSocketRawFDs Anonymous session sockets that are currently open
+ * @param isPriorityFork Value controlling the process priority level until accept is called
* @return In the Zygote process this function will always return null; in unspecialized app
* processes this function will return a Runnable object representing the new
* application that is passed up from usapMain.
*/
static Runnable forkUsap(LocalServerSocket usapPoolSocket,
- int[] sessionSocketRawFDs) {
+ int[] sessionSocketRawFDs,
+ boolean isPriorityFork) {
FileDescriptor[] pipeFDs = null;
try {
@@ -477,7 +486,8 @@ public final class Zygote {
}
int pid =
- nativeForkUsap(pipeFDs[0].getInt$(), pipeFDs[1].getInt$(), sessionSocketRawFDs);
+ nativeForkUsap(pipeFDs[0].getInt$(), pipeFDs[1].getInt$(),
+ sessionSocketRawFDs, isPriorityFork);
if (pid == 0) {
IoUtils.closeQuietly(pipeFDs[0]);
@@ -491,8 +501,9 @@ public final class Zygote {
}
private static native int nativeForkUsap(int readPipeFD,
- int writePipeFD,
- int[] sessionSocketRawFDs);
+ int writePipeFD,
+ int[] sessionSocketRawFDs,
+ boolean isPriorityFork);
/**
* This function is used by unspecialized app processes to wait for specialization requests from
@@ -515,6 +526,11 @@ public final class Zygote {
// Load resources
ZygoteInit.nativePreloadGraphicsDriver();
+ // Change the priority to max before calling accept so we can respond to new specialization
+ // requests as quickly as possible. This will be reverted to the default priority in the
+ // native specialization code.
+ boostUsapPriority();
+
while (true) {
try {
sessionSocket = usapPoolSocket.accept();
@@ -626,6 +642,12 @@ public final class Zygote {
}
}
+ private static void boostUsapPriority() {
+ nativeBoostUsapPriority();
+ }
+
+ private static native void nativeBoostUsapPriority();
+
private static final String USAP_ERROR_PREFIX = "Invalid command to USAP: ";
/**
@@ -866,15 +888,6 @@ public final class Zygote {
}
/**
- * Resets the calling thread priority to the default value (Thread.NORM_PRIORITY
- * or nice value 0). This updates both the priority value in java.lang.Thread and
- * the nice value (setpriority).
- */
- static void resetNicePriority() {
- Thread.currentThread().setPriority(Thread.NORM_PRIORITY);
- }
-
- /**
* Executes "/system/bin/sh -c <command>" using the exec() system call.
* This method throws a runtime exception if exec() failed, otherwise, this
* method never returns.
diff --git a/core/java/com/android/internal/os/ZygoteConnection.java b/core/java/com/android/internal/os/ZygoteConnection.java
index 885f522cd22b..577ed9bd196b 100644
--- a/core/java/com/android/internal/os/ZygoteConnection.java
+++ b/core/java/com/android/internal/os/ZygoteConnection.java
@@ -330,7 +330,7 @@ class ZygoteConnection {
if (zygoteServer.isUsapPoolEnabled()) {
Runnable fpResult =
zygoteServer.fillUsapPool(
- new int[]{mSocket.getFileDescriptor().getInt$()});
+ new int[]{mSocket.getFileDescriptor().getInt$()}, false);
if (fpResult != null) {
zygoteServer.setForkChild();
diff --git a/core/java/com/android/internal/os/ZygoteInit.java b/core/java/com/android/internal/os/ZygoteInit.java
index f9e868fafe50..c5a0af75c9d9 100644
--- a/core/java/com/android/internal/os/ZygoteInit.java
+++ b/core/java/com/android/internal/os/ZygoteInit.java
@@ -822,6 +822,9 @@ public class ZygoteInit {
public static void main(String argv[]) {
ZygoteServer zygoteServer = null;
+ // Set the initial thread priority to the "normal" value.
+ Thread.currentThread().setPriority(Thread.NORM_PRIORITY);
+
// Mark zygote start. This ensures that thread creation will throw
// an error.
ZygoteHooks.startZygoteNoThreadCreation();
@@ -881,8 +884,6 @@ public class ZygoteInit {
EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_END,
SystemClock.uptimeMillis());
bootTimingsTraceLog.traceEnd(); // ZygotePreload
- } else {
- Zygote.resetNicePriority();
}
// Do an initial gc to clean up after startup
diff --git a/core/java/com/android/internal/os/ZygoteServer.java b/core/java/com/android/internal/os/ZygoteServer.java
index 4c911ea2641e..b9e517909e5a 100644
--- a/core/java/com/android/internal/os/ZygoteServer.java
+++ b/core/java/com/android/internal/os/ZygoteServer.java
@@ -67,6 +67,15 @@ class ZygoteServer {
private static final String USAP_POOL_SIZE_MIN_DEFAULT = "1";
/**
+ * Number of milliseconds to delay before refilling the pool if it hasn't reached its
+ * minimum value.
+ */
+ private static final int USAP_REFILL_DELAY_MS = 3000;
+
+ /** The "not a timestamp" value for the refill delay timestamp mechanism. */
+ private static final int INVALID_TIMESTAMP = -1;
+
+ /**
* Indicates if this Zygote server can support a unspecialized app process pool. Currently this
* should only be true for the primary and secondary Zygotes, and not the App Zygotes or the
* WebView Zygote.
@@ -131,6 +140,12 @@ class ZygoteServer {
*/
private int mUsapPoolRefillThreshold = 0;
+ private enum UsapPoolRefillAction {
+ DELAYED,
+ IMMEDIATE,
+ NONE
+ }
+
ZygoteServer() {
mUsapPoolEventFD = null;
mZygoteSocket = null;
@@ -293,9 +308,16 @@ class ZygoteServer {
}
}
+ private void fetchUsapPoolPolicyPropsIfUnfetched() {
+ if (mIsFirstPropertyCheck) {
+ mIsFirstPropertyCheck = false;
+ fetchUsapPoolPolicyProps();
+ }
+ }
+
/**
- * Checks to see if the current policy says that pool should be refilled, and spawns new USAPs
- * if necessary.
+ * Refill the USAP Pool to the appropriate level, determined by whether this is a priority
+ * refill event or not.
*
* @param sessionSocketRawFDs Anonymous session sockets that are currently open
* @return In the Zygote process this function will always return null; in unspecialized app
@@ -303,39 +325,46 @@ class ZygoteServer {
* application that is passed up from usapMain.
*/
- Runnable fillUsapPool(int[] sessionSocketRawFDs) {
+ Runnable fillUsapPool(int[] sessionSocketRawFDs, boolean isPriorityRefill) {
Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "Zygote:FillUsapPool");
// Ensure that the pool properties have been fetched.
- fetchUsapPoolPolicyPropsWithMinInterval();
+ fetchUsapPoolPolicyPropsIfUnfetched();
int usapPoolCount = Zygote.getUsapPoolCount();
- int numUsapsToSpawn = mUsapPoolSizeMax - usapPoolCount;
+ int numUsapsToSpawn;
- if (usapPoolCount < mUsapPoolSizeMin
- || numUsapsToSpawn >= mUsapPoolRefillThreshold) {
+ if (isPriorityRefill) {
+ // Refill to min
+ numUsapsToSpawn = mUsapPoolSizeMin - usapPoolCount;
- // Disable some VM functionality and reset some system values
- // before forking.
- ZygoteHooks.preFork();
- Zygote.resetNicePriority();
+ Log.i("zygote",
+ "Priority USAP Pool refill. New USAPs: " + numUsapsToSpawn);
+ } else {
+ // Refill up to max
+ numUsapsToSpawn = mUsapPoolSizeMax - usapPoolCount;
- while (usapPoolCount++ < mUsapPoolSizeMax) {
- Runnable caller = Zygote.forkUsap(mUsapPoolSocket, sessionSocketRawFDs);
+ Log.i("zygote",
+ "Delayed USAP Pool refill. New USAPs: " + numUsapsToSpawn);
+ }
- if (caller != null) {
- return caller;
- }
- }
+ // Disable some VM functionality and reset some system values
+ // before forking.
+ ZygoteHooks.preFork();
- // Re-enable runtime services for the Zygote. Services for unspecialized app process
- // are re-enabled in specializeAppProcess.
- ZygoteHooks.postForkCommon();
+ while (--numUsapsToSpawn >= 0) {
+ Runnable caller =
+ Zygote.forkUsap(mUsapPoolSocket, sessionSocketRawFDs, isPriorityRefill);
- Log.i("zygote",
- "Filled the USAP pool. New USAPs: " + numUsapsToSpawn);
+ if (caller != null) {
+ return caller;
+ }
}
+ // Re-enable runtime services for the Zygote. Services for unspecialized app process
+ // are re-enabled in specializeAppProcess.
+ ZygoteHooks.postForkCommon();
+
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
return null;
@@ -358,7 +387,7 @@ class ZygoteServer {
mUsapPoolEnabled = newStatus;
if (newStatus) {
- return fillUsapPool(new int[]{ sessionSocket.getFileDescriptor().getInt$() });
+ return fillUsapPool(new int[]{ sessionSocket.getFileDescriptor().getInt$() }, false);
} else {
Zygote.emptyUsapPool();
return null;
@@ -377,6 +406,8 @@ class ZygoteServer {
socketFDs.add(mZygoteSocket.getFileDescriptor());
peers.add(null);
+ long usapPoolRefillTriggerTimestamp = INVALID_TIMESTAMP;
+
while (true) {
fetchUsapPoolPolicyPropsWithMinInterval();
@@ -430,142 +461,192 @@ class ZygoteServer {
}
}
+ int pollTimeoutMs;
+
+ if (usapPoolRefillTriggerTimestamp == INVALID_TIMESTAMP) {
+ pollTimeoutMs = -1;
+ } else {
+ int elapsedTimeMs =
+ (int) (System.currentTimeMillis() - usapPoolRefillTriggerTimestamp);
+
+ if (elapsedTimeMs >= USAP_REFILL_DELAY_MS) {
+ // Normalize the poll timeout value when the time between one poll event and the
+ // next pushes us over the delay value. This prevents poll receiving a 0
+ // timeout value, which would result in it returning immediately.
+ pollTimeoutMs = -1;
+ } else {
+ pollTimeoutMs = USAP_REFILL_DELAY_MS - elapsedTimeMs;
+ }
+ }
+
+ int pollReturnValue;
try {
- Os.poll(pollFDs, -1);
+ pollReturnValue = Os.poll(pollFDs, pollTimeoutMs);
} catch (ErrnoException ex) {
throw new RuntimeException("poll failed", ex);
}
- boolean usapPoolFDRead = false;
-
- while (--pollIndex >= 0) {
- if ((pollFDs[pollIndex].revents & POLLIN) == 0) {
- continue;
- }
-
- if (pollIndex == 0) {
- // Zygote server socket
+ UsapPoolRefillAction usapPoolRefillAction = UsapPoolRefillAction.NONE;
+ if (pollReturnValue == 0) {
+ // The poll timeout has been exceeded. This only occurs when we have finished the
+ // USAP pool refill delay period.
- ZygoteConnection newPeer = acceptCommandPeer(abiList);
- peers.add(newPeer);
- socketFDs.add(newPeer.getFileDescriptor());
+ usapPoolRefillTriggerTimestamp = INVALID_TIMESTAMP;
+ usapPoolRefillAction = UsapPoolRefillAction.DELAYED;
- } else if (pollIndex < usapPoolEventFDIndex) {
- // Session socket accepted from the Zygote server socket
+ } else {
+ boolean usapPoolFDRead = false;
- try {
- ZygoteConnection connection = peers.get(pollIndex);
- final Runnable command = connection.processOneCommand(this);
+ while (--pollIndex >= 0) {
+ if ((pollFDs[pollIndex].revents & POLLIN) == 0) {
+ continue;
+ }
- // TODO (chriswailes): Is this extra check necessary?
- if (mIsForkChild) {
- // We're in the child. We should always have a command to run at this
- // stage if processOneCommand hasn't called "exec".
- if (command == null) {
- throw new IllegalStateException("command == null");
+ if (pollIndex == 0) {
+ // Zygote server socket
+
+ ZygoteConnection newPeer = acceptCommandPeer(abiList);
+ peers.add(newPeer);
+ socketFDs.add(newPeer.getFileDescriptor());
+
+ } else if (pollIndex < usapPoolEventFDIndex) {
+ // Session socket accepted from the Zygote server socket
+
+ try {
+ ZygoteConnection connection = peers.get(pollIndex);
+ final Runnable command = connection.processOneCommand(this);
+
+ // TODO (chriswailes): Is this extra check necessary?
+ if (mIsForkChild) {
+ // We're in the child. We should always have a command to run at
+ // this stage if processOneCommand hasn't called "exec".
+ if (command == null) {
+ throw new IllegalStateException("command == null");
+ }
+
+ return command;
+ } else {
+ // We're in the server - we should never have any commands to run.
+ if (command != null) {
+ throw new IllegalStateException("command != null");
+ }
+
+ // We don't know whether the remote side of the socket was closed or
+ // not until we attempt to read from it from processOneCommand. This
+ // shows up as a regular POLLIN event in our regular processing
+ // loop.
+ if (connection.isClosedByPeer()) {
+ connection.closeSocket();
+ peers.remove(pollIndex);
+ socketFDs.remove(pollIndex);
+ }
}
+ } catch (Exception e) {
+ if (!mIsForkChild) {
+ // We're in the server so any exception here is one that has taken
+ // place pre-fork while processing commands or reading / writing
+ // from the control socket. Make a loud noise about any such
+ // exceptions so that we know exactly what failed and why.
- return command;
- } else {
- // We're in the server - we should never have any commands to run.
- if (command != null) {
- throw new IllegalStateException("command != null");
- }
+ Slog.e(TAG, "Exception executing zygote command: ", e);
+
+ // Make sure the socket is closed so that the other end knows
+ // immediately that something has gone wrong and doesn't time out
+ // waiting for a response.
+ ZygoteConnection conn = peers.remove(pollIndex);
+ conn.closeSocket();
- // We don't know whether the remote side of the socket was closed or
- // not until we attempt to read from it from processOneCommand. This
- // shows up as a regular POLLIN event in our regular processing loop.
- if (connection.isClosedByPeer()) {
- connection.closeSocket();
- peers.remove(pollIndex);
socketFDs.remove(pollIndex);
+ } else {
+ // We're in the child so any exception caught here has happened post
+ // fork and before we execute ActivityThread.main (or any other
+ // main() method). Log the details of the exception and bring down
+ // the process.
+ Log.e(TAG, "Caught post-fork exception in child process.", e);
+ throw e;
}
+ } finally {
+ // Reset the child flag, in the event that the child process is a child-
+ // zygote. The flag will not be consulted this loop pass after the
+ // Runnable is returned.
+ mIsForkChild = false;
}
- } catch (Exception e) {
- if (!mIsForkChild) {
- // We're in the server so any exception here is one that has taken place
- // pre-fork while processing commands or reading / writing from the
- // control socket. Make a loud noise about any such exceptions so that
- // we know exactly what failed and why.
-
- Slog.e(TAG, "Exception executing zygote command: ", e);
-
- // Make sure the socket is closed so that the other end knows
- // immediately that something has gone wrong and doesn't time out
- // waiting for a response.
- ZygoteConnection conn = peers.remove(pollIndex);
- conn.closeSocket();
-
- socketFDs.remove(pollIndex);
- } else {
- // We're in the child so any exception caught here has happened post
- // fork and before we execute ActivityThread.main (or any other main()
- // method). Log the details of the exception and bring down the process.
- Log.e(TAG, "Caught post-fork exception in child process.", e);
- throw e;
- }
- } finally {
- // Reset the child flag, in the event that the child process is a child-
- // zygote. The flag will not be consulted this loop pass after the Runnable
- // is returned.
- mIsForkChild = false;
- }
- } else {
- // Either the USAP pool event FD or a USAP reporting pipe.
-
- // If this is the event FD the payload will be the number of USAPs removed.
- // If this is a reporting pipe FD the payload will be the PID of the USAP
- // that was just specialized. The `continue` statements below ensure that
- // the messagePayload will always be valid if we complete the try block without
- // an exception.
- long messagePayload;
-
- try {
- byte[] buffer = new byte[Zygote.USAP_MANAGEMENT_MESSAGE_BYTES];
- int readBytes = Os.read(pollFDs[pollIndex].fd, buffer, 0, buffer.length);
-
- if (readBytes == Zygote.USAP_MANAGEMENT_MESSAGE_BYTES) {
- DataInputStream inputStream =
- new DataInputStream(new ByteArrayInputStream(buffer));
-
- messagePayload = inputStream.readLong();
- } else {
- Log.e(TAG, "Incomplete read from USAP management FD of size "
- + readBytes);
+ } else {
+ // Either the USAP pool event FD or a USAP reporting pipe.
+
+ // If this is the event FD the payload will be the number of USAPs removed.
+ // If this is a reporting pipe FD the payload will be the PID of the USAP
+ // that was just specialized. The `continue` statements below ensure that
+ // the messagePayload will always be valid if we complete the try block
+ // without an exception.
+ long messagePayload;
+
+ try {
+ byte[] buffer = new byte[Zygote.USAP_MANAGEMENT_MESSAGE_BYTES];
+ int readBytes =
+ Os.read(pollFDs[pollIndex].fd, buffer, 0, buffer.length);
+
+ if (readBytes == Zygote.USAP_MANAGEMENT_MESSAGE_BYTES) {
+ DataInputStream inputStream =
+ new DataInputStream(new ByteArrayInputStream(buffer));
+
+ messagePayload = inputStream.readLong();
+ } else {
+ Log.e(TAG, "Incomplete read from USAP management FD of size "
+ + readBytes);
+ continue;
+ }
+ } catch (Exception ex) {
+ if (pollIndex == usapPoolEventFDIndex) {
+ Log.e(TAG, "Failed to read from USAP pool event FD: "
+ + ex.getMessage());
+ } else {
+ Log.e(TAG, "Failed to read from USAP reporting pipe: "
+ + ex.getMessage());
+ }
+
continue;
}
- } catch (Exception ex) {
- if (pollIndex == usapPoolEventFDIndex) {
- Log.e(TAG, "Failed to read from USAP pool event FD: "
- + ex.getMessage());
- } else {
- Log.e(TAG, "Failed to read from USAP reporting pipe: "
- + ex.getMessage());
+
+ if (pollIndex > usapPoolEventFDIndex) {
+ Zygote.removeUsapTableEntry((int) messagePayload);
}
- continue;
+ usapPoolFDRead = true;
}
+ }
- if (pollIndex > usapPoolEventFDIndex) {
- Zygote.removeUsapTableEntry((int) messagePayload);
- }
+ if (usapPoolFDRead) {
+ int usapPoolCount = Zygote.getUsapPoolCount();
- usapPoolFDRead = true;
+ if (usapPoolCount < mUsapPoolSizeMin) {
+ // Immediate refill
+ usapPoolRefillAction = UsapPoolRefillAction.IMMEDIATE;
+ } else if (mUsapPoolSizeMax - usapPoolCount >= mUsapPoolRefillThreshold) {
+ // Delayed refill
+ usapPoolRefillTriggerTimestamp = System.currentTimeMillis();
+ }
}
}
- // Check to see if the USAP pool needs to be refilled.
- if (usapPoolFDRead) {
+ if (usapPoolRefillAction != UsapPoolRefillAction.NONE) {
int[] sessionSocketRawFDs =
socketFDs.subList(1, socketFDs.size())
.stream()
.mapToInt(FileDescriptor::getInt$)
.toArray();
- final Runnable command = fillUsapPool(sessionSocketRawFDs);
+ final boolean isPriorityRefill =
+ usapPoolRefillAction == UsapPoolRefillAction.IMMEDIATE;
+
+ final Runnable command =
+ fillUsapPool(sessionSocketRawFDs, isPriorityRefill);
if (command != null) {
return command;
+ } else if (isPriorityRefill) {
+ // Schedule a delayed refill to finish refilling the pool.
+ usapPoolRefillTriggerTimestamp = System.currentTimeMillis();
}
}
}
diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp
index 8ff16912e932..5267427a6cd3 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -169,6 +169,15 @@ static int gUsapPoolEventFD = -1;
*/
static constexpr int USAP_POOL_SIZE_MAX_LIMIT = 100;
+/** The numeric value for the maximum priority a process may possess. */
+static constexpr int PROCESS_PRIORITY_MAX = -20;
+
+/** The numeric value for the minimum priority a process may possess. */
+static constexpr int PROCESS_PRIORITY_MIN = 19;
+
+/** The numeric value for the normal priority a process should have. */
+static constexpr int PROCESS_PRIORITY_DEFAULT = 0;
+
/**
* A helper class containing accounting information for USAPs.
*/
@@ -893,7 +902,8 @@ static void ClearUsapTable() {
// Utility routine to fork a process from the zygote.
static pid_t ForkCommon(JNIEnv* env, bool is_system_server,
const std::vector<int>& fds_to_close,
- const std::vector<int>& fds_to_ignore) {
+ const std::vector<int>& fds_to_ignore,
+ bool is_priority_fork) {
SetSignalHandlers();
// Curry a failure function.
@@ -926,6 +936,12 @@ static pid_t ForkCommon(JNIEnv* env, bool is_system_server,
pid_t pid = fork();
if (pid == 0) {
+ if (is_priority_fork) {
+ setpriority(PRIO_PROCESS, 0, PROCESS_PRIORITY_MAX);
+ } else {
+ setpriority(PRIO_PROCESS, 0, PROCESS_PRIORITY_MIN);
+ }
+
// The child process.
PreApplicationInit();
@@ -1123,6 +1139,9 @@ static void SpecializeCommon(JNIEnv* env, uid_t uid, gid_t gid, jintArray gids,
env->CallStaticVoidMethod(gZygoteClass, gCallPostForkChildHooks, runtime_flags,
is_system_server, is_child_zygote, managed_instruction_set);
+ // Reset the process priority to the default value.
+ setpriority(PRIO_PROCESS, 0, PROCESS_PRIORITY_DEFAULT);
+
if (env->ExceptionCheck()) {
fail_fn("Error calling post fork hooks.");
}
@@ -1360,7 +1379,7 @@ static jint com_android_internal_os_Zygote_nativeForkAndSpecialize(
fds_to_ignore.push_back(gUsapPoolEventFD);
}
- pid_t pid = ForkCommon(env, false, fds_to_close, fds_to_ignore);
+ pid_t pid = ForkCommon(env, false, fds_to_close, fds_to_ignore, true);
if (pid == 0) {
SpecializeCommon(env, uid, gid, gids, runtime_flags, rlimits,
@@ -1387,7 +1406,8 @@ static jint com_android_internal_os_Zygote_nativeForkSystemServer(
pid_t pid = ForkCommon(env, true,
fds_to_close,
- fds_to_ignore);
+ fds_to_ignore,
+ true);
if (pid == 0) {
SpecializeCommon(env, uid, gid, gids, runtime_flags, rlimits,
permitted_capabilities, effective_capabilities,
@@ -1429,13 +1449,15 @@ static jint com_android_internal_os_Zygote_nativeForkSystemServer(
* zygote in managed code.
* @param managed_session_socket_fds A list of anonymous session sockets that must be ignored by
* the FD hygiene code and automatically "closed" in the new USAP.
+ * @param is_priority_fork Controls the nice level assigned to the newly created process
* @return
*/
static jint com_android_internal_os_Zygote_nativeForkUsap(JNIEnv* env,
jclass,
jint read_pipe_fd,
jint write_pipe_fd,
- jintArray managed_session_socket_fds) {
+ jintArray managed_session_socket_fds,
+ jboolean is_priority_fork) {
std::vector<int> fds_to_close(MakeUsapPipeReadFDVector()),
fds_to_ignore(fds_to_close);
@@ -1457,7 +1479,8 @@ static jint com_android_internal_os_Zygote_nativeForkUsap(JNIEnv* env,
fds_to_ignore.push_back(write_pipe_fd);
fds_to_ignore.insert(fds_to_ignore.end(), session_socket_fds.begin(), session_socket_fds.end());
- pid_t usap_pid = ForkCommon(env, /* is_system_server= */ false, fds_to_close, fds_to_ignore);
+ pid_t usap_pid = ForkCommon(env, /* is_system_server= */ false, fds_to_close, fds_to_ignore,
+ is_priority_fork == JNI_TRUE);
if (usap_pid != 0) {
++gUsapPoolCount;
@@ -1678,6 +1701,10 @@ static jboolean com_android_internal_os_Zygote_nativeDisableExecuteOnly(JNIEnv*
return dl_iterate_phdr(disable_execute_only, nullptr) == 0;
}
+static void com_android_internal_os_Zygote_nativeBoostUsapPriority(JNIEnv* env, jclass) {
+ setpriority(PRIO_PROCESS, 0, PROCESS_PRIORITY_MAX);
+}
+
static const JNINativeMethod gMethods[] = {
{ "nativeForkAndSpecialize",
"(II[II[[IILjava/lang/String;Ljava/lang/String;[I[IZLjava/lang/String;Ljava/lang/String;)I",
@@ -1690,7 +1717,7 @@ static const JNINativeMethod gMethods[] = {
(void *) com_android_internal_os_Zygote_nativePreApplicationInit },
{ "nativeInstallSeccompUidGidFilter", "(II)V",
(void *) com_android_internal_os_Zygote_nativeInstallSeccompUidGidFilter },
- { "nativeForkUsap", "(II[I)I",
+ { "nativeForkUsap", "(II[IZ)I",
(void *) com_android_internal_os_Zygote_nativeForkUsap },
{ "nativeSpecializeAppProcess",
"(II[II[[IILjava/lang/String;Ljava/lang/String;ZLjava/lang/String;Ljava/lang/String;)V",
@@ -1708,7 +1735,9 @@ static const JNINativeMethod gMethods[] = {
{ "nativeEmptyUsapPool", "()V",
(void *) com_android_internal_os_Zygote_nativeEmptyUsapPool },
{ "nativeDisableExecuteOnly", "()Z",
- (void *) com_android_internal_os_Zygote_nativeDisableExecuteOnly }
+ (void *) com_android_internal_os_Zygote_nativeDisableExecuteOnly },
+ { "nativeBoostUsapPriority", "()V",
+ (void* ) com_android_internal_os_Zygote_nativeBoostUsapPriority }
};
int register_com_android_internal_os_Zygote(JNIEnv* env) {
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-12-05 05:43:56 +0000