PackageManagerService启动

android11-release

SystemServer 启动 PackageManagerService

在 startBootstrapServices 中启动 PackageManagerService

PackageManagerService.main() 过程主要是创建PKMS服务，并注册到ServiceManager
Installer 连接 “installd” 服务，正干活的是installd守护进程
mOnlyCore 只有在加密设备时只运行“核心”应用程序，创建一个极简的启动环境。读取"vold.decrypt"属性，值为"trigger_restart_min_framework"、"1"时为true
mFirstBoot 是否首次启动，后面WMS创建时所需要的参数。
mPackageManager 创建ApplicationPackageManager转化成父类PackageManager。
SystemServerDexLoadReporter 捕获系统服务加载的任何dex文件。

        // Wait for installd to finish starting up so that it has a chance to// create critical directories such as /data/user with the appropriate// permissions.  We need this to complete before we initialize other services.t.traceBegin("StartInstaller");Installer installer = mSystemServiceManager.startService(Installer.class);t.traceEnd();
//... ... ... ...// Only run "core" apps if we're encrypting the device.String cryptState = VoldProperties.decrypt().orElse("");if (ENCRYPTING_STATE.equals(cryptState)) {Slog.w(TAG, "Detected encryption in progress - only parsing core apps");mOnlyCore = true;} else if (ENCRYPTED_STATE.equals(cryptState)) {Slog.w(TAG, "Device encrypted - only parsing core apps");mOnlyCore = true;}// Start the package manager.if (!mRuntimeRestart) {FrameworkStatsLog.write(FrameworkStatsLog.BOOT_TIME_EVENT_ELAPSED_TIME_REPORTED,FrameworkStatsLog.BOOT_TIME_EVENT_ELAPSED_TIME__EVENT__PACKAGE_MANAGER_INIT_START,SystemClock.elapsedRealtime());}t.traceBegin("StartPackageManagerService");try {Watchdog.getInstance().pauseWatchingCurrentThread("packagemanagermain");mPackageManagerService = PackageManagerService.main(mSystemContext, installer,mFactoryTestMode != FactoryTest.FACTORY_TEST_OFF, mOnlyCore);} finally {Watchdog.getInstance().resumeWatchingCurrentThread("packagemanagermain");}// Now that the package manager has started, register the dex load reporter to capture any// dex files loaded by system server.// These dex files will be optimized by the BackgroundDexOptService.SystemServerDexLoadReporter.configureSystemServerDexReporter(mPackageManagerService);mFirstBoot = mPackageManagerService.isFirstBoot();mPackageManager = mSystemContext.getPackageManager();t.traceEnd();

PackageManagerService.main()

创建PKMS服务package和服务package_native并注册到ServiceManager

    public static PackageManagerService main(Context context, Installer installer,boolean factoryTest, boolean onlyCore) {// ... ...PackageManagerService m = new PackageManagerService(injector, onlyCore, factoryTest);t.traceEnd(); // "create package manager"// ... ..m.installWhitelistedSystemPackages();ServiceManager.addService("package", m);final PackageManagerNative pmn = m.new PackageManagerNative();ServiceManager.addService("package_native", pmn);return m;}

查看相应的EventLog输出分如下阶段：

BOOT_PROGRESS_PMS_START（开始阶段）
BOOT_PROGRESS_PMS_SYSTEM_SCAN_START（扫描系统阶段）
BOOT_PROGRESS_PMS_DATA_SCAN_START（扫描Data分区阶段）
BOOT_PROGRESS_PMS_SCAN_END（扫描结束阶段）
BOOT_PROGRESS_PMS_READY（准备阶段）

BOOT_PROGRESS_PMS_START

EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_START, SystemClock.uptimeMillis());在PackageManagerService初始化中，mInstallLock、mLock两把锁前后

创建提供服务/数据的子组件。这里的秩序很重要。
添加system, phone, log, nfc, bluetooth, shell, se, networkstack 这八种shareUserId到mSettings
创建Dex优化相关类
获取系统配置信息
各种扫描的目录mDirsToScanAsSystem
创建名为“PackageManager”的ServiceThread线程，创建PackageHandler绑定到ServiceThread的消息队列，并将PackageHandler添加到Watchdog的检测集中；mInstallLock、mLock两把锁
获取共享库
!mOnlyCore和第一次启动执行requestCopyPreoptedFiles()