Enables the use of the blastula pool.
This commit adds the code necessar to initialize and use the blastula
pool during application launching. Highlights include:
* Modifying ZygoteState to allow the creation of blastula session
sockets
* Modified application startup to track if a web view process is being
created.
* Initialization of the blastula pool during Zygote initialization.
* Blastula lifecycle management via reporting pipes and event FDs.
* Launching of applications via the blastula pool.
The creation, maintenance, and use of the blastula pool can be disabled
by setting Zygote.BLASTULA_POOL_ENABLED to false. When this feature is
disabled applications will launch as they did before this patch.
Topic: zygote-prefork
Test: make & flash & launch app & check log message
Bug: 68253328
Exempt-From-Owner-Approval: No changes to files with owners between revisions
Change-Id: I46c32ad09400591e866b6c6121d5a9b0332092f3
diff --git a/core/java/com/android/internal/os/Zygote.java b/core/java/com/android/internal/os/Zygote.java
index f609f2f..069413f 100644
--- a/core/java/com/android/internal/os/Zygote.java
+++ b/core/java/com/android/internal/os/Zygote.java
@@ -117,7 +117,13 @@
/** 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 @@
// 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 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 @@
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 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 @@
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.