在这里插入图片描述

一、概述

Android系统启动过程中，会启动一个包管理服务PackageManagerService(PKMS)，这个服务主要负责扫描系统中指定目录，找出里面以apk结尾的文件，通过对这些文件进行解析，得到应用程序的所有信息并完成应用程序的安装过程。

二、SystemServer中的PKMS

android-10.0.0_r41\frameworks\base\services\java\com\android\server\SystemServer.java

SystemServer中的startBootstrapServices启动PKMS服务

        // Start the package manager.if (!mRuntimeRestart) {MetricsLogger.histogram(null, "boot_package_manager_init_start",(int) SystemClock.elapsedRealtime());}traceBeginAndSlog("StartPackageManagerService");try {Watchdog.getInstance().pauseWatchingCurrentThread("packagemanagermain");mPackageManagerService = PackageManagerService.main(mSystemContext, installer,mFactoryTestMode != FactoryTest.FACTORY_TEST_OFF, mOnlyCore);} finally {Watchdog.getInstance().resumeWatchingCurrentThread("packagemanagermain");}mFirstBoot = mPackageManagerService.isFirstBoot();mPackageManager = mSystemContext.getPackageManager();traceEnd();

三、PKMS中的main方法

android-10.0.0_r41\frameworks\base\services\core\java\com\android\server\pm\PackageManagerService.java

public static PackageManagerService main(Context context, Installer installer,boolean factoryTest, boolean onlyCore) {// Self-check for initial settings.PackageManagerServiceCompilerMapping.checkProperties();PackageManagerService m = new PackageManagerService(context, installer,factoryTest, onlyCore);m.enableSystemUserPackages();ServiceManager.addService("package", m);final PackageManagerNative pmn = m.new PackageManagerNative();ServiceManager.addService("package_native", pmn);return m;}

调用构造方法，创建PackageManagerService对象
调用ServiceManager的addService方法，添加PKMS服务

四、PKMS的构造方法

public PackageManagerService(Context context, Installer installer,boolean factoryTest, boolean onlyCore) {LockGuard.installLock(mPackages, LockGuard.INDEX_PACKAGES);Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "create package manager");//前期准备EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_START,SystemClock.uptimeMillis());if (mSdkVersion <= 0) {Slog.w(TAG, "**** ro.build.version.sdk not set!");}mContext = context;mFactoryTest = factoryTest;mOnlyCore = onlyCore;mMetrics = new DisplayMetrics();mInstaller = installer;// Create sub-components that provide services / data. Order here is important.synchronized (mInstallLock) {synchronized (mPackages) {// Expose private service for system components to use.LocalServices.addService(PackageManagerInternal.class, new PackageManagerInternalImpl());sUserManager = new UserManagerService(context, this,new UserDataPreparer(mInstaller, mInstallLock, mContext, mOnlyCore), mPackages);mComponentResolver = new ComponentResolver(sUserManager,LocalServices.getService(PackageManagerInternal.class),mPackages);mPermissionManager = PermissionManagerService.create(context,mPackages /*externalLock*/);mDefaultPermissionPolicy = mPermissionManager.getDefaultPermissionGrantPolicy();mSettings = new Settings(Environment.getDataDirectory(),mPermissionManager.getPermissionSettings(), mPackages);}}mSettings.addSharedUserLPw("android.uid.system", Process.SYSTEM_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.phone", RADIO_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.log", LOG_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.nfc", NFC_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.bluetooth", BLUETOOTH_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.shell", SHELL_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.se", SE_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.networkstack", NETWORKSTACK_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);String separateProcesses = SystemProperties.get("debug.separate_processes");if (separateProcesses != null && separateProcesses.length() > 0) {if ("*".equals(separateProcesses)) {mDefParseFlags = PackageParser.PARSE_IGNORE_PROCESSES;mSeparateProcesses = null;Slog.w(TAG, "Running with debug.separate_processes: * (ALL)");} else {mDefParseFlags = 0;mSeparateProcesses = separateProcesses.split(",");Slog.w(TAG, "Running with debug.separate_processes: "+ separateProcesses);}} else {mDefParseFlags = 0;mSeparateProcesses = null;}mPackageDexOptimizer = new PackageDexOptimizer(installer, mInstallLock, context,"*dexopt*");mDexManager = new DexManager(mContext, this, mPackageDexOptimizer, installer, mInstallLock);mArtManagerService = new ArtManagerService(mContext, this, installer, mInstallLock);mMoveCallbacks = new MoveCallbacks(FgThread.get().getLooper());mViewCompiler = new ViewCompiler(mInstallLock, mInstaller);mOnPermissionChangeListeners = new OnPermissionChangeListeners(FgThread.get().getLooper());getDefaultDisplayMetrics(context, mMetrics);Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "get system config");SystemConfig systemConfig = SystemConfig.getInstance();mAvailableFeatures = systemConfig.getAvailableFeatures();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);mProtectedPackages = new ProtectedPackages(mContext);mApexManager = new ApexManager(context);synchronized (mInstallLock) {// writersynchronized (mPackages) {mHandlerThread = new ServiceThread(TAG,Process.THREAD_PRIORITY_BACKGROUND, true /*allowIo*/);mHandlerThread.start();mHandler = new PackageHandler(mHandlerThread.getLooper());mProcessLoggingHandler = new ProcessLoggingHandler();Watchdog.getInstance().addThread(mHandler, WATCHDOG_TIMEOUT);mInstantAppRegistry = new InstantAppRegistry(this);ArrayMap<String, SystemConfig.SharedLibraryEntry> libConfig= systemConfig.getSharedLibraries();final int builtInLibCount = libConfig.size();for (int i = 0; i < builtInLibCount; i++) {String name = libConfig.keyAt(i);SystemConfig.SharedLibraryEntry entry = libConfig.valueAt(i);addBuiltInSharedLibraryLocked(entry.filename, name);}// Now that we have added all the libraries, iterate again to add dependency// information IFF their dependencies are added.long undefinedVersion = SharedLibraryInfo.VERSION_UNDEFINED;for (int i = 0; i < builtInLibCount; i++) {String name = libConfig.keyAt(i);SystemConfig.SharedLibraryEntry entry = libConfig.valueAt(i);final int dependencyCount = entry.dependencies.length;for (int j = 0; j < dependencyCount; j++) {final SharedLibraryInfo dependency =getSharedLibraryInfoLPr(entry.dependencies[j], undefinedVersion);if (dependency != null) {getSharedLibraryInfoLPr(name, undefinedVersion).addDependency(dependency);}}}SELinuxMMAC.readInstallPolicy();Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "loadFallbacks");FallbackCategoryProvider.loadFallbacks();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "read user settings");mFirstBoot = !mSettings.readLPw(sUserManager.getUsers(false));Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);// Clean up orphaned packages for which the code path doesn't exist// and they are an update to a system app - caused by bug/32321269final int packageSettingCount = mSettings.mPackages.size();for (int i = packageSettingCount - 1; i >= 0; i--) {PackageSetting ps = mSettings.mPackages.valueAt(i);if (!isExternal(ps) && (ps.codePath == null || !ps.codePath.exists())&& mSettings.getDisabledSystemPkgLPr(ps.name) != null) {mSettings.mPackages.removeAt(i);mSettings.enableSystemPackageLPw(ps.name);}}if (!mOnlyCore && mFirstBoot) {requestCopyPreoptedFiles();}String customResolverActivityName = Resources.getSystem().getString(R.string.config_customResolverActivity);if (!TextUtils.isEmpty(customResolverActivityName)) {mCustomResolverComponentName = ComponentName.unflattenFromString(customResolverActivityName);}//系统扫描阶段long startTime = SystemClock.uptimeMillis();EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SYSTEM_SCAN_START, startTime);final String bootClassPath = System.getenv("BOOTCLASSPATH");final String systemServerClassPath = System.getenv("SYSTEMSERVERCLASSPATH");if (bootClassPath == null) {Slog.w(TAG, "No BOOTCLASSPATH found!");}if (systemServerClassPath == null) {Slog.w(TAG, "No SYSTEMSERVERCLASSPATH found!");}File frameworkDir = new File(Environment.getRootDirectory(), "framework");final VersionInfo ver = mSettings.getInternalVersion();mIsUpgrade = !Build.FINGERPRINT.equals(ver.fingerprint);if (mIsUpgrade) {logCriticalInfo(Log.INFO,"Upgrading from " + ver.fingerprint + " to " + Build.FINGERPRINT);}// when upgrading from pre-M, promote system app permissions from install to runtimemPromoteSystemApps =mIsUpgrade && ver.sdkVersion <= Build.VERSION_CODES.LOLLIPOP_MR1;// When upgrading from pre-N, we need to handle package extraction like first boot,// as there is no profiling data available.mIsPreNUpgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.N;mIsPreNMR1Upgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.N_MR1;mIsPreQUpgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.Q;int preUpgradeSdkVersion = ver.sdkVersion;// save off the names of pre-existing system packages prior to scanning; we don't// want to automatically grant runtime permissions for new system appsif (mPromoteSystemApps) {Iterator<PackageSetting> pkgSettingIter = mSettings.mPackages.values().iterator();while (pkgSettingIter.hasNext()) {PackageSetting ps = pkgSettingIter.next();if (isSystemApp(ps)) {mExistingSystemPackages.add(ps.name);}}}mCacheDir = preparePackageParserCache();// Set flag to monitor and not change apk file paths when// scanning install directories.int scanFlags = SCAN_BOOTING | SCAN_INITIAL;if (mIsUpgrade || mFirstBoot) {scanFlags = scanFlags | SCAN_FIRST_BOOT_OR_UPGRADE;}// Collect vendor/product/product_services overlay packages. (Do this before scanning// any apps.)// For security and version matching reason, only consider overlay packages if they// reside in the right directory.scanDirTracedLI(new File(VENDOR_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR,0);scanDirTracedLI(new File(PRODUCT_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT,0);scanDirTracedLI(new File(PRODUCT_SERVICES_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES,0);scanDirTracedLI(new File(ODM_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_ODM,0);scanDirTracedLI(new File(OEM_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_OEM,0);mParallelPackageParserCallback.findStaticOverlayPackages();// Find base frameworks (resource packages without code).scanDirTracedLI(frameworkDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_NO_DEX| SCAN_AS_SYSTEM| SCAN_AS_PRIVILEGED,0);if (!mPackages.containsKey("android")) {throw new IllegalStateException("Failed to load frameworks package; check log for warnings");}// Collect privileged system packages.final File privilegedAppDir = new File(Environment.getRootDirectory(), "priv-app");scanDirTracedLI(privilegedAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRIVILEGED,0);// Collect ordinary system packages.final File systemAppDir = new File(Environment.getRootDirectory(), "app");scanDirTracedLI(systemAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM,0);// Collect privileged vendor packages.File privilegedVendorAppDir = new File(Environment.getVendorDirectory(), "priv-app");try {privilegedVendorAppDir = privilegedVendorAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedVendorAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR| SCAN_AS_PRIVILEGED,0);// Collect ordinary vendor packages.File vendorAppDir = new File(Environment.getVendorDirectory(), "app");try {vendorAppDir = vendorAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(vendorAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR,0);// Collect privileged odm packages. /odm is another vendor partition// other than /vendor.File privilegedOdmAppDir = new File(Environment.getOdmDirectory(),"priv-app");try {privilegedOdmAppDir = privilegedOdmAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedOdmAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR| SCAN_AS_PRIVILEGED,0);// Collect ordinary odm packages. /odm is another vendor partition// other than /vendor.File odmAppDir = new File(Environment.getOdmDirectory(), "app");try {odmAppDir = odmAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(odmAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR,0);// Collect all OEM packages.final File oemAppDir = new File(Environment.getOemDirectory(), "app");scanDirTracedLI(oemAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_OEM,0);// Collected privileged /product packages.File privilegedProductAppDir = new File(Environment.getProductDirectory(), "priv-app");try {privilegedProductAppDir = privilegedProductAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedProductAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT| SCAN_AS_PRIVILEGED,0);// Collect ordinary /product packages.File productAppDir = new File(Environment.getProductDirectory(), "app");try {productAppDir = productAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(productAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT,0);// Collected privileged /product_services packages.File privilegedProductServicesAppDir =new File(Environment.getProductServicesDirectory(), "priv-app");try {privilegedProductServicesAppDir =privilegedProductServicesAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedProductServicesAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES| SCAN_AS_PRIVILEGED,0);// Collect ordinary /product_services packages.File productServicesAppDir = new File(Environment.getProductServicesDirectory(), "app");try {productServicesAppDir = productServicesAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(productServicesAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES,0);// Prune any system packages that no longer exist.final List<String> possiblyDeletedUpdatedSystemApps = new ArrayList<>();// Stub packages must either be replaced with full versions in the /data// partition or be disabled.final List<String> stubSystemApps = new ArrayList<>();if (!mOnlyCore) {// do this first before mucking with mPackages for the "expecting better" casefinal Iterator<PackageParser.Package> pkgIterator = mPackages.values().iterator();while (pkgIterator.hasNext()) {final PackageParser.Package pkg = pkgIterator.next();if (pkg.isStub) {stubSystemApps.add(pkg.packageName);}}final Iterator<PackageSetting> psit = mSettings.mPackages.values().iterator();while (psit.hasNext()) {PackageSetting ps = psit.next();/** If this is not a system app, it can't be a* disable system app.*/if ((ps.pkgFlags & ApplicationInfo.FLAG_SYSTEM) == 0) {continue;}/** If the package is scanned, it's not erased.*/final PackageParser.Package scannedPkg = mPackages.get(ps.name);if (scannedPkg != null) {/** If the system app is both scanned and in the* disabled packages list, then it must have been* added via OTA. Remove it from the currently* scanned package so the previously user-installed* application can be scanned.*/if (mSettings.isDisabledSystemPackageLPr(ps.name)) {logCriticalInfo(Log.WARN,"Expecting better updated system app for " + ps.name+ "; removing system app.  Last known"+ " codePath=" + ps.codePathString+ ", versionCode=" + ps.versionCode+ "; scanned versionCode=" + scannedPkg.getLongVersionCode());removePackageLI(scannedPkg, true);mExpectingBetter.put(ps.name, ps.codePath);}continue;}if (!mSettings.isDisabledSystemPackageLPr(ps.name)) {psit.remove();logCriticalInfo(Log.WARN, "System package " + ps.name+ " no longer exists; it's data will be wiped");// Actual deletion of code and data will be handled by later// reconciliation step} else {// we still have a disabled system package, but, it still might have// been removed. check the code path still exists and check there's// still a package. the latter can happen if an OTA keeps the same// code path, but, changes the package name.final PackageSetting disabledPs =mSettings.getDisabledSystemPkgLPr(ps.name);if (disabledPs.codePath == null || !disabledPs.codePath.exists()|| disabledPs.pkg == null) {possiblyDeletedUpdatedSystemApps.add(ps.name);} else {// We're expecting that the system app should remain disabled, but add// it to expecting better to recover in case the data version cannot// be scanned.mExpectingBetter.put(disabledPs.name, disabledPs.codePath);}}}}//delete tmp filesdeleteTempPackageFiles();final int cachedSystemApps = PackageParser.sCachedPackageReadCount.get();// Remove any shared userIDs that have no associated packagesmSettings.pruneSharedUsersLPw();final long systemScanTime = SystemClock.uptimeMillis() - startTime;final int systemPackagesCount = mPackages.size();Slog.i(TAG, "Finished scanning system apps. Time: " + systemScanTime+ " ms, packageCount: " + systemPackagesCount+ " , timePerPackage: "+ (systemPackagesCount == 0 ? 0 : systemScanTime / systemPackagesCount)+ " , cached: " + cachedSystemApps);if (mIsUpgrade && systemPackagesCount > 0) {MetricsLogger.histogram(null, "ota_package_manager_system_app_avg_scan_time",((int) systemScanTime) / systemPackagesCount);}if (!mOnlyCore) {//数据扫描阶段EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_DATA_SCAN_START,SystemClock.uptimeMillis());scanDirTracedLI(sAppInstallDir, 0, scanFlags | SCAN_REQUIRE_KNOWN, 0);// Remove disable package settings for updated system apps that were// removed via an OTA. If the update is no longer present, remove the// app completely. Otherwise, revoke their system privileges.for (int i = possiblyDeletedUpdatedSystemApps.size() - 1; i >= 0; --i) {final String packageName = possiblyDeletedUpdatedSystemApps.get(i);final PackageParser.Package pkg = mPackages.get(packageName);final String msg;// remove from the disabled system list; do this first so any future// scans of this package are performed without this statemSettings.removeDisabledSystemPackageLPw(packageName);if (pkg == null) {// should have found an update, but, we didn't; remove everythingmsg = "Updated system package " + packageName+ " no longer exists; removing its data";// Actual deletion of code and data will be handled by later// reconciliation step} else {// found an update; revoke system privilegesmsg = "Updated system package " + packageName+ " no longer exists; rescanning package on data";// NOTE: We don't do anything special if a stub is removed from the// system image. But, if we were [like removing the uncompressed// version from the /data partition], this is where it'd be done.// remove the package from the system and re-scan it without any// special privilegesremovePackageLI(pkg, true);try {final File codePath = new File(pkg.applicationInfo.getCodePath());scanPackageTracedLI(codePath, 0, scanFlags, 0, null);} catch (PackageManagerException e) {Slog.e(TAG, "Failed to parse updated, ex-system package: "+ e.getMessage());}}// one final check. if we still have a package setting [ie. it was// previously scanned and known to the system], but, we don't have// a package [ie. there was an error scanning it from the /data// partition], completely remove the package data.final PackageSetting ps = mSettings.mPackages.get(packageName);if (ps != null && mPackages.get(packageName) == null) {removePackageDataLIF(ps, null, null, 0, false);}logCriticalInfo(Log.WARN, msg);}/** Make sure all system apps that we expected to appear on* the userdata partition actually showed up. If they never* appeared, crawl back and revive the system version.*/for (int i = 0; i < mExpectingBetter.size(); i++) {final String packageName = mExpectingBetter.keyAt(i);if (!mPackages.containsKey(packageName)) {final File scanFile = mExpectingBetter.valueAt(i);logCriticalInfo(Log.WARN, "Expected better " + packageName+ " but never showed up; reverting to system");final @ParseFlags int reparseFlags;final @ScanFlags int rescanFlags;if (FileUtils.contains(privilegedAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(systemAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM;} else if (FileUtils.contains(privilegedVendorAppDir, scanFile)|| FileUtils.contains(privilegedOdmAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(vendorAppDir, scanFile)|| FileUtils.contains(odmAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR;} else if (FileUtils.contains(oemAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_OEM;} else if (FileUtils.contains(privilegedProductAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(productAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT;} else if (FileUtils.contains(privilegedProductServicesAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(productServicesAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES;} else {Slog.e(TAG, "Ignoring unexpected fallback path " + scanFile);continue;}mSettings.enableSystemPackageLPw(packageName);try {scanPackageTracedLI(scanFile, reparseFlags, rescanFlags, 0, null);} catch (PackageManagerException e) {Slog.e(TAG, "Failed to parse original system package: "+ e.getMessage());}}}// Uncompress and install any stubbed system applications.// This must be done last to ensure all stubs are replaced or disabled.installSystemStubPackages(stubSystemApps, scanFlags);final int cachedNonSystemApps = PackageParser.sCachedPackageReadCount.get()- cachedSystemApps;final long dataScanTime = SystemClock.uptimeMillis() - systemScanTime - startTime;final int dataPackagesCount = mPackages.size() - systemPackagesCount;Slog.i(TAG, "Finished scanning non-system apps. Time: " + dataScanTime+ " ms, packageCount: " + dataPackagesCount+ " , timePerPackage: "+ (dataPackagesCount == 0 ? 0 : dataScanTime / dataPackagesCount)+ " , cached: " + cachedNonSystemApps);if (mIsUpgrade && dataPackagesCount > 0) {MetricsLogger.histogram(null, "ota_package_manager_data_app_avg_scan_time",((int) dataScanTime) / dataPackagesCount);}}mExpectingBetter.clear();// Resolve the storage manager.mStorageManagerPackage = getStorageManagerPackageName();// Resolve protected action filters. Only the setup wizard is allowed to// have a high priority filter for these actions.mSetupWizardPackage = getSetupWizardPackageName();mComponentResolver.fixProtectedFilterPriorities();mSystemTextClassifierPackage = getSystemTextClassifierPackageName();mWellbeingPackage = getWellbeingPackageName();mDocumenterPackage = getDocumenterPackageName();mConfiguratorPackage = getDeviceConfiguratorPackageName();mAppPredictionServicePackage = getAppPredictionServicePackageName();mIncidentReportApproverPackage = getIncidentReportApproverPackageName();// Now that we know all of the shared libraries, update all clients to have// the correct library paths.updateAllSharedLibrariesLocked(null, Collections.unmodifiableMap(mPackages));for (SharedUserSetting setting : mSettings.getAllSharedUsersLPw()) {// NOTE: We ignore potential failures here during a system scan (like// the rest of the commands above) because there's precious little we// can do about it. A settings error is reported, though.final List<String> changedAbiCodePath =adjustCpuAbisForSharedUserLPw(setting.packages, null /*scannedPackage*/);if (changedAbiCodePath != null && changedAbiCodePath.size() > 0) {for (int i = changedAbiCodePath.size() - 1; i >= 0; --i) {final String codePathString = changedAbiCodePath.get(i);try {mInstaller.rmdex(codePathString,getDexCodeInstructionSet(getPreferredInstructionSet()));} catch (InstallerException ignored) {}}}// Adjust seInfo to ensure apps which share a sharedUserId are placed in the same// SELinux domain.setting.fixSeInfoLocked();}// Now that we know all the packages we are keeping,// read and update their last usage times.mPackageUsage.read(mPackages);mCompilerStats.read();//PKMS扫描工作完成EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SCAN_END,SystemClock.uptimeMillis());Slog.i(TAG, "Time to scan packages: "+ ((SystemClock.uptimeMillis()-startTime)/1000f)+ " seconds");// If the platform SDK has changed since the last time we booted,// we need to re-grant app permission to catch any new ones that// appear.  This is really a hack, and means that apps can in some// cases get permissions that the user didn't initially explicitly// allow...  it would be nice to have some better way to handle// this situation.final boolean sdkUpdated = (ver.sdkVersion != mSdkVersion);if (sdkUpdated) {Slog.i(TAG, "Platform changed from " + ver.sdkVersion + " to "+ mSdkVersion + "; regranting permissions for internal storage");}mPermissionManager.updateAllPermissions(StorageManager.UUID_PRIVATE_INTERNAL, sdkUpdated, mPackages.values(),mPermissionCallback);ver.sdkVersion = mSdkVersion;// If this is the first boot or an update from pre-M, and it is a normal// boot, then we need to initialize the default preferred apps across// all defined users.if (!onlyCore && (mPromoteSystemApps || mFirstBoot)) {for (UserInfo user : sUserManager.getUsers(true)) {mSettings.applyDefaultPreferredAppsLPw(user.id);primeDomainVerificationsLPw(user.id);}}// Prepare storage for system user really early during boot,// since core system apps like SettingsProvider and SystemUI// can't wait for user to startfinal int storageFlags;if (StorageManager.isFileEncryptedNativeOrEmulated()) {storageFlags = StorageManager.FLAG_STORAGE_DE;} else {storageFlags = StorageManager.FLAG_STORAGE_DE | StorageManager.FLAG_STORAGE_CE;}List<String> deferPackages = reconcileAppsDataLI(StorageManager.UUID_PRIVATE_INTERNAL,UserHandle.USER_SYSTEM, storageFlags, true /* migrateAppData */,true /* onlyCoreApps */);mPrepareAppDataFuture = SystemServerInitThreadPool.get().submit(() -> {TimingsTraceLog traceLog = new TimingsTraceLog("SystemServerTimingAsync",Trace.TRACE_TAG_PACKAGE_MANAGER);traceLog.traceBegin("AppDataFixup");try {mInstaller.fixupAppData(StorageManager.UUID_PRIVATE_INTERNAL,StorageManager.FLAG_STORAGE_DE | StorageManager.FLAG_STORAGE_CE);} catch (InstallerException e) {Slog.w(TAG, "Trouble fixing GIDs", e);}traceLog.traceEnd();traceLog.traceBegin("AppDataPrepare");if (deferPackages == null || deferPackages.isEmpty()) {return;}int count = 0;for (String pkgName : deferPackages) {PackageParser.Package pkg = null;synchronized (mPackages) {PackageSetting ps = mSettings.getPackageLPr(pkgName);if (ps != null && ps.getInstalled(UserHandle.USER_SYSTEM)) {pkg = ps.pkg;}}if (pkg != null) {synchronized (mInstallLock) {prepareAppDataAndMigrateLIF(pkg, UserHandle.USER_SYSTEM, storageFlags,true /* maybeMigrateAppData */);}count++;}}traceLog.traceEnd();Slog.i(TAG, "Deferred reconcileAppsData finished " + count + " packages");}, "prepareAppData");// If this is first boot after an OTA, and a normal boot, then// we need to clear code cache directories.// Note that we do *not* clear the application profiles. These remain valid// across OTAs and are used to drive profile verification (post OTA) and// profile compilation (without waiting to collect a fresh set of profiles).if (mIsUpgrade && !onlyCore) {Slog.i(TAG, "Build fingerprint changed; clearing code caches");for (int i = 0; i < mSettings.mPackages.size(); i++) {final PackageSetting ps = mSettings.mPackages.valueAt(i);if (Objects.equals(StorageManager.UUID_PRIVATE_INTERNAL, ps.volumeUuid)) {// No apps are running this early, so no need to freezeclearAppDataLIF(ps.pkg, UserHandle.USER_ALL,FLAG_STORAGE_DE | FLAG_STORAGE_CE | FLAG_STORAGE_EXTERNAL| Installer.FLAG_CLEAR_CODE_CACHE_ONLY);}}ver.fingerprint = Build.FINGERPRINT;}// Grandfather existing (installed before Q) non-system apps to hide// their icons in launcher.if (!onlyCore && mIsPreQUpgrade) {Slog.i(TAG, "Whitelisting all existing apps to hide their icons");int size = mSettings.mPackages.size();for (int i = 0; i < size; i++) {final PackageSetting ps = mSettings.mPackages.valueAt(i);if ((ps.pkgFlags & ApplicationInfo.FLAG_SYSTEM) != 0) {continue;}ps.disableComponentLPw(PackageManager.APP_DETAILS_ACTIVITY_CLASS_NAME,UserHandle.USER_SYSTEM);}}// clear only after permissions and other defaults have been updatedmExistingSystemPackages.clear();mPromoteSystemApps = false;// All the changes are done during package scanning.ver.databaseVersion = Settings.CURRENT_DATABASE_VERSION;// can downgrade to readerTrace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "write settings");mSettings.writeLPr();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);//PKMS已完成EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_READY,SystemClock.uptimeMillis());if (!mOnlyCore) {mRequiredVerifierPackage = getRequiredButNotReallyRequiredVerifierLPr();mRequiredInstallerPackage = getRequiredInstallerLPr();mRequiredUninstallerPackage = getRequiredUninstallerLPr();mIntentFilterVerifierComponent = getIntentFilterVerifierComponentNameLPr();if (mIntentFilterVerifierComponent != null) {mIntentFilterVerifier = new IntentVerifierProxy(mContext,mIntentFilterVerifierComponent);} else {mIntentFilterVerifier = null;}mServicesSystemSharedLibraryPackageName = getRequiredSharedLibraryLPr(PackageManager.SYSTEM_SHARED_LIBRARY_SERVICES,SharedLibraryInfo.VERSION_UNDEFINED);mSharedSystemSharedLibraryPackageName = getRequiredSharedLibraryLPr(PackageManager.SYSTEM_SHARED_LIBRARY_SHARED,SharedLibraryInfo.VERSION_UNDEFINED);} else {mRequiredVerifierPackage = null;mRequiredInstallerPackage = null;mRequiredUninstallerPackage = null;mIntentFilterVerifierComponent = null;mIntentFilterVerifier = null;mServicesSystemSharedLibraryPackageName = null;mSharedSystemSharedLibraryPackageName = null;}// PermissionController hosts default permission granting and role management, so it's a// critical part of the core system.mRequiredPermissionControllerPackage = getRequiredPermissionControllerLPr();// Initialize InstantAppRegistry's Instant App list for all users.final int[] userIds = UserManagerService.getInstance().getUserIds();for (PackageParser.Package pkg : mPackages.values()) {if (pkg.isSystem()) {continue;}for (int userId : userIds) {final PackageSetting ps = (PackageSetting) pkg.mExtras;if (ps == null || !ps.getInstantApp(userId) || !ps.getInstalled(userId)) {continue;}mInstantAppRegistry.addInstantAppLPw(userId, ps.appId);}}mInstallerService = new PackageInstallerService(context, this, mApexManager);final Pair<ComponentName, String> instantAppResolverComponent =getInstantAppResolverLPr();if (instantAppResolverComponent != null) {if (DEBUG_INSTANT) {Slog.d(TAG, "Set ephemeral resolver: " + instantAppResolverComponent);}mInstantAppResolverConnection = new InstantAppResolverConnection(mContext, instantAppResolverComponent.first,instantAppResolverComponent.second);mInstantAppResolverSettingsComponent =getInstantAppResolverSettingsLPr(instantAppResolverComponent.first);} else {mInstantAppResolverConnection = null;mInstantAppResolverSettingsComponent = null;}updateInstantAppInstallerLocked(null);// Read and update the usage of dex files.// Do this at the end of PM init so that all the packages have their// data directory reconciled.// At this point we know the code paths of the packages, so we can validate// the disk file and build the internal cache.// The usage file is expected to be small so loading and verifying it// should take a fairly small time compare to the other activities (e.g. package// scanning).final Map<Integer, List<PackageInfo>> userPackages = new HashMap<>();for (int userId : userIds) {userPackages.put(userId, getInstalledPackages(/*flags*/ 0, userId).getList());}mDexManager.load(userPackages);if (mIsUpgrade) {MetricsLogger.histogram(null, "ota_package_manager_init_time",(int) (SystemClock.uptimeMillis() - startTime));}} // synchronized (mPackages)} // synchronized (mInstallLock)mModuleInfoProvider = new ModuleInfoProvider(mContext, this);// Now after opening every single application zip, make sure they// are all flushed.  Not really needed, but keeps things nice and// tidy.Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "GC");Runtime.getRuntime().gc();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);// The initial scanning above does many calls into installd while// holding the mPackages lock, but we're mostly interested in yelling// once we have a booted system.mInstaller.setWarnIfHeld(mPackages);PackageParser.readConfigUseRoundIcon(mContext.getResources());mServiceStartWithDelay = SystemClock.uptimeMillis() + (60 * 1000L);Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);}

PKMS的构造方法，代码就有1000多行，可见在创建PKMS对象的时候，会耗时很久。

BOOT_PROGRESS_PMS_START，前期准备阶段

        Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "create package manager");EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_START,SystemClock.uptimeMillis());if (mSdkVersion <= 0) {Slog.w(TAG, "**** ro.build.version.sdk not set!");}mContext = context;mFactoryTest = factoryTest;mOnlyCore = onlyCore;mMetrics = new DisplayMetrics();mInstaller = installer;// Create sub-components that provide services / data. Order here is important.synchronized (mInstallLock) {synchronized (mPackages) {// Expose private service for system components to use.LocalServices.addService(PackageManagerInternal.class, new PackageManagerInternalImpl());sUserManager = new UserManagerService(context, this,new UserDataPreparer(mInstaller, mInstallLock, mContext, mOnlyCore), mPackages);mComponentResolver = new ComponentResolver(sUserManager,LocalServices.getService(PackageManagerInternal.class),mPackages);mPermissionManager = PermissionManagerService.create(context,mPackages /*externalLock*/);mDefaultPermissionPolicy = mPermissionManager.getDefaultPermissionGrantPolicy();mSettings = new Settings(Environment.getDataDirectory(),mPermissionManager.getPermissionSettings(), mPackages);}}mSettings.addSharedUserLPw("android.uid.system", Process.SYSTEM_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.phone", RADIO_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.log", LOG_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.nfc", NFC_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.bluetooth", BLUETOOTH_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.shell", SHELL_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.se", SE_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);mSettings.addSharedUserLPw("android.uid.networkstack", NETWORKSTACK_UID,ApplicationInfo.FLAG_SYSTEM, ApplicationInfo.PRIVATE_FLAG_PRIVILEGED);String separateProcesses = SystemProperties.get("debug.separate_processes");if (separateProcesses != null && separateProcesses.length() > 0) {if ("*".equals(separateProcesses)) {mDefParseFlags = PackageParser.PARSE_IGNORE_PROCESSES;mSeparateProcesses = null;Slog.w(TAG, "Running with debug.separate_processes: * (ALL)");} else {mDefParseFlags = 0;mSeparateProcesses = separateProcesses.split(",");Slog.w(TAG, "Running with debug.separate_processes: "+ separateProcesses);}} else {mDefParseFlags = 0;mSeparateProcesses = null;}mPackageDexOptimizer = new PackageDexOptimizer(installer, mInstallLock, context,"*dexopt*");mDexManager = new DexManager(mContext, this, mPackageDexOptimizer, installer, mInstallLock);mArtManagerService = new ArtManagerService(mContext, this, installer, mInstallLock);mMoveCallbacks = new MoveCallbacks(FgThread.get().getLooper());mViewCompiler = new ViewCompiler(mInstallLock, mInstaller);mOnPermissionChangeListeners = new OnPermissionChangeListeners(FgThread.get().getLooper());getDefaultDisplayMetrics(context, mMetrics);Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "get system config");SystemConfig systemConfig = SystemConfig.getInstance();mAvailableFeatures = systemConfig.getAvailableFeatures();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);mProtectedPackages = new ProtectedPackages(mContext);mApexManager = new ApexManager(context);synchronized (mInstallLock) {// writersynchronized (mPackages) {mHandlerThread = new ServiceThread(TAG,Process.THREAD_PRIORITY_BACKGROUND, true /*allowIo*/);mHandlerThread.start();mHandler = new PackageHandler(mHandlerThread.getLooper());mProcessLoggingHandler = new ProcessLoggingHandler();Watchdog.getInstance().addThread(mHandler, WATCHDOG_TIMEOUT);mInstantAppRegistry = new InstantAppRegistry(this);ArrayMap<String, SystemConfig.SharedLibraryEntry> libConfig= systemConfig.getSharedLibraries();final int builtInLibCount = libConfig.size();for (int i = 0; i < builtInLibCount; i++) {String name = libConfig.keyAt(i);SystemConfig.SharedLibraryEntry entry = libConfig.valueAt(i);addBuiltInSharedLibraryLocked(entry.filename, name);}// Now that we have added all the libraries, iterate again to add dependency// information IFF their dependencies are added.long undefinedVersion = SharedLibraryInfo.VERSION_UNDEFINED;for (int i = 0; i < builtInLibCount; i++) {String name = libConfig.keyAt(i);SystemConfig.SharedLibraryEntry entry = libConfig.valueAt(i);final int dependencyCount = entry.dependencies.length;for (int j = 0; j < dependencyCount; j++) {final SharedLibraryInfo dependency =getSharedLibraryInfoLPr(entry.dependencies[j], undefinedVersion);if (dependency != null) {getSharedLibraryInfoLPr(name, undefinedVersion).addDependency(dependency);}}}SELinuxMMAC.readInstallPolicy();Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "loadFallbacks");FallbackCategoryProvider.loadFallbacks();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "read user settings");mFirstBoot = !mSettings.readLPw(sUserManager.getUsers(false));Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);// Clean up orphaned packages for which the code path doesn't exist// and they are an update to a system app - caused by bug/32321269final int packageSettingCount = mSettings.mPackages.size();for (int i = packageSettingCount - 1; i >= 0; i--) {PackageSetting ps = mSettings.mPackages.valueAt(i);if (!isExternal(ps) && (ps.codePath == null || !ps.codePath.exists())&& mSettings.getDisabledSystemPkgLPr(ps.name) != null) {mSettings.mPackages.removeAt(i);mSettings.enableSystemPackageLPw(ps.name);}}if (!mOnlyCore && mFirstBoot) {requestCopyPreoptedFiles();}String customResolverActivityName = Resources.getSystem().getString(R.string.config_customResolverActivity);if (!TextUtils.isEmpty(customResolverActivityName)) {mCustomResolverComponentName = ComponentName.unflattenFromString(customResolverActivityName);}

构造 DisplayMetrics，保存分辨率相关信息
创建Installer对象，与installd交互
创建mPermissionManager对象，进行权限管理
构造Settings类，保存安装包信息，清除路径不存在的孤立应用，主要涉及/data/system/目录的packages.xml, packages-backup.xml,packages.list,packages-stopped.xml,packages-stopped-backup.xml等文件。
构造PackageDexOptimizer及DexManager类，处理dex优化
创建SystemConfig实例，获取系统配置信息，配置共享lib库
创建PackageManager的Handler线程，循环处理外部安装相关消息。

扫描系统APK阶段

            long startTime = SystemClock.uptimeMillis();EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SYSTEM_SCAN_START,startTime);final String bootClassPath = System.getenv("BOOTCLASSPATH");final String systemServerClassPath = System.getenv("SYSTEMSERVERCLASSPATH");if (bootClassPath == null) {Slog.w(TAG, "No BOOTCLASSPATH found!");}if (systemServerClassPath == null) {Slog.w(TAG, "No SYSTEMSERVERCLASSPATH found!");}File frameworkDir = new File(Environment.getRootDirectory(), "framework");final VersionInfo ver = mSettings.getInternalVersion();mIsUpgrade = !Build.FINGERPRINT.equals(ver.fingerprint);if (mIsUpgrade) {logCriticalInfo(Log.INFO,"Upgrading from " + ver.fingerprint + " to " + Build.FINGERPRINT);}// when upgrading from pre-M, promote system app permissions from install to runtimemPromoteSystemApps =mIsUpgrade && ver.sdkVersion <= Build.VERSION_CODES.LOLLIPOP_MR1;// When upgrading from pre-N, we need to handle package extraction like first boot,// as there is no profiling data available.mIsPreNUpgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.N;mIsPreNMR1Upgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.N_MR1;mIsPreQUpgrade = mIsUpgrade && ver.sdkVersion < Build.VERSION_CODES.Q;int preUpgradeSdkVersion = ver.sdkVersion;// save off the names of pre-existing system packages prior to scanning; we don't// want to automatically grant runtime permissions for new system appsif (mPromoteSystemApps) {Iterator<PackageSetting> pkgSettingIter = mSettings.mPackages.values().iterator();while (pkgSettingIter.hasNext()) {PackageSetting ps = pkgSettingIter.next();if (isSystemApp(ps)) {mExistingSystemPackages.add(ps.name);}}}mCacheDir = preparePackageParserCache();// Set flag to monitor and not change apk file paths when// scanning install directories.int scanFlags = SCAN_BOOTING | SCAN_INITIAL;if (mIsUpgrade || mFirstBoot) {scanFlags = scanFlags | SCAN_FIRST_BOOT_OR_UPGRADE;}// Collect vendor/product/product_services overlay packages. (Do this before scanning// any apps.)// For security and version matching reason, only consider overlay packages if they// reside in the right directory.scanDirTracedLI(new File(VENDOR_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR,0);scanDirTracedLI(new File(PRODUCT_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT,0);scanDirTracedLI(new File(PRODUCT_SERVICES_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES,0);scanDirTracedLI(new File(ODM_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_ODM,0);scanDirTracedLI(new File(OEM_OVERLAY_DIR),mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_OEM,0);mParallelPackageParserCallback.findStaticOverlayPackages();// Find base frameworks (resource packages without code).scanDirTracedLI(frameworkDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_NO_DEX| SCAN_AS_SYSTEM| SCAN_AS_PRIVILEGED,0);if (!mPackages.containsKey("android")) {throw new IllegalStateException("Failed to load frameworks package; check log for warnings");}// Collect privileged system packages.final File privilegedAppDir = new File(Environment.getRootDirectory(), "priv-app");scanDirTracedLI(privilegedAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRIVILEGED,0);// Collect ordinary system packages.final File systemAppDir = new File(Environment.getRootDirectory(), "app");scanDirTracedLI(systemAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM,0);// Collect privileged vendor packages.File privilegedVendorAppDir = new File(Environment.getVendorDirectory(), "priv-app");try {privilegedVendorAppDir = privilegedVendorAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedVendorAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR| SCAN_AS_PRIVILEGED,0);// Collect ordinary vendor packages.File vendorAppDir = new File(Environment.getVendorDirectory(), "app");try {vendorAppDir = vendorAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(vendorAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR,0);// Collect privileged odm packages. /odm is another vendor partition// other than /vendor.File privilegedOdmAppDir = new File(Environment.getOdmDirectory(),"priv-app");try {privilegedOdmAppDir = privilegedOdmAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedOdmAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR| SCAN_AS_PRIVILEGED,0);// Collect ordinary odm packages. /odm is another vendor partition// other than /vendor.File odmAppDir = new File(Environment.getOdmDirectory(), "app");try {odmAppDir = odmAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(odmAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR,0);// Collect all OEM packages.final File oemAppDir = new File(Environment.getOemDirectory(), "app");scanDirTracedLI(oemAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_OEM,0);// Collected privileged /product packages.File privilegedProductAppDir = new File(Environment.getProductDirectory(), "priv-app");try {privilegedProductAppDir = privilegedProductAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedProductAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT| SCAN_AS_PRIVILEGED,0);// Collect ordinary /product packages.File productAppDir = new File(Environment.getProductDirectory(), "app");try {productAppDir = productAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(productAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT,0);// Collected privileged /product_services packages.File privilegedProductServicesAppDir =new File(Environment.getProductServicesDirectory(), "priv-app");try {privilegedProductServicesAppDir =privilegedProductServicesAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(privilegedProductServicesAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES| SCAN_AS_PRIVILEGED,0);// Collect ordinary /product_services packages.File productServicesAppDir = new File(Environment.getProductServicesDirectory(), "app");try {productServicesAppDir = productServicesAppDir.getCanonicalFile();} catch (IOException e) {// failed to look up canonical path, continue with original one}scanDirTracedLI(productServicesAppDir,mDefParseFlags| PackageParser.PARSE_IS_SYSTEM_DIR,scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES,0);// Prune any system packages that no longer exist.final List<String> possiblyDeletedUpdatedSystemApps = new ArrayList<>();// Stub packages must either be replaced with full versions in the /data// partition or be disabled.final List<String> stubSystemApps = new ArrayList<>();if (!mOnlyCore) {// do this first before mucking with mPackages for the "expecting better" casefinal Iterator<PackageParser.Package> pkgIterator = mPackages.values().iterator();while (pkgIterator.hasNext()) {final PackageParser.Package pkg = pkgIterator.next();if (pkg.isStub) {stubSystemApps.add(pkg.packageName);}}final Iterator<PackageSetting> psit = mSettings.mPackages.values().iterator();while (psit.hasNext()) {PackageSetting ps = psit.next();/** If this is not a system app, it can't be a* disable system app.*/if ((ps.pkgFlags & ApplicationInfo.FLAG_SYSTEM) == 0) {continue;}/** If the package is scanned, it's not erased.*/final PackageParser.Package scannedPkg = mPackages.get(ps.name);if (scannedPkg != null) {/** If the system app is both scanned and in the* disabled packages list, then it must have been* added via OTA. Remove it from the currently* scanned package so the previously user-installed* application can be scanned.*/if (mSettings.isDisabledSystemPackageLPr(ps.name)) {logCriticalInfo(Log.WARN,"Expecting better updated system app for " + ps.name+ "; removing system app.  Last known"+ " codePath=" + ps.codePathString+ ", versionCode=" + ps.versionCode+ "; scanned versionCode=" + scannedPkg.getLongVersionCode());removePackageLI(scannedPkg, true);mExpectingBetter.put(ps.name, ps.codePath);}continue;}if (!mSettings.isDisabledSystemPackageLPr(ps.name)) {psit.remove();logCriticalInfo(Log.WARN, "System package " + ps.name+ " no longer exists; it's data will be wiped");// Actual deletion of code and data will be handled by later// reconciliation step} else {// we still have a disabled system package, but, it still might have// been removed. check the code path still exists and check there's// still a package. the latter can happen if an OTA keeps the same// code path, but, changes the package name.final PackageSetting disabledPs =mSettings.getDisabledSystemPkgLPr(ps.name);if (disabledPs.codePath == null || !disabledPs.codePath.exists()|| disabledPs.pkg == null) {possiblyDeletedUpdatedSystemApps.add(ps.name);} else {// We're expecting that the system app should remain disabled, but add// it to expecting better to recover in case the data version cannot// be scanned.mExpectingBetter.put(disabledPs.name, disabledPs.codePath);}}}}//delete tmp filesdeleteTempPackageFiles();final int cachedSystemApps = PackageParser.sCachedPackageReadCount.get();// Remove any shared userIDs that have no associated packagesmSettings.pruneSharedUsersLPw();final long systemScanTime = SystemClock.uptimeMillis() - startTime;final int systemPackagesCount = mPackages.size();Slog.i(TAG, "Finished scanning system apps. Time: " + systemScanTime+ " ms, packageCount: " + systemPackagesCount+ " , timePerPackage: "+ (systemPackagesCount == 0 ? 0 : systemScanTime / systemPackagesCount)+ " , cached: " + cachedSystemApps);if (mIsUpgrade && systemPackagesCount > 0) {MetricsLogger.histogram(null, "ota_package_manager_system_app_avg_scan_time",((int) systemScanTime) / systemPackagesCount);}

1、扫描解析系统App,并把系统App信息存储在PKMS的相关属性和mSettings里

/vendor/overlay
/product/overlay
/product_services/overlay
/odm/overlay
/oem/overlay
/system/framework
/system/priv-app
/system/app
/vendor/priv-app
/vendor/app
/odm/priv-app
/odm/app
/oem/app
/oem/priv-app
/product/priv-app
/product/app
/product_services/priv-app
/product_services/app
/product_services/priv-app

2、scanDirLI函数

private void scanDirLI(File scanDir, int parseFlags, int scanFlags, long currentTime) {final File[] files = scanDir.listFiles();if (ArrayUtils.isEmpty(files)) {Log.d(TAG, "No files in app dir " + scanDir);return;}if (DEBUG_PACKAGE_SCANNING) {Log.d(TAG, "Scanning app dir " + scanDir + " scanFlags=" + scanFlags+ " flags=0x" + Integer.toHexString(parseFlags));}try (ParallelPackageParser parallelPackageParser = new ParallelPackageParser(mSeparateProcesses, mOnlyCore, mMetrics, mCacheDir,mParallelPackageParserCallback)) {// Submit files for parsing in parallelint fileCount = 0;for (File file : files) {final boolean isPackage = (isApkFile(file) || file.isDirectory())&& !PackageInstallerService.isStageName(file.getName());if (!isPackage) {// Ignore entries which are not packagescontinue;}parallelPackageParser.submit(file, parseFlags);①fileCount++;}// Process results one by onefor (; fileCount > 0; fileCount--) {ParallelPackageParser.ParseResult parseResult = parallelPackageParser.take();Throwable throwable = parseResult.throwable;int errorCode = PackageManager.INSTALL_SUCCEEDED;if (throwable == null) {// TODO(toddke): move lower in the scan chain// Static shared libraries have synthetic package namesif (parseResult.pkg.applicationInfo.isStaticSharedLibrary()) {renameStaticSharedLibraryPackage(parseResult.pkg);}try {scanPackageChildLI(parseResult.pkg, parseFlags, scanFlags,currentTime, null);} catch (PackageManagerException e) {errorCode = e.error;Slog.w(TAG, "Failed to scan " + parseResult.scanFile + ": " + e.getMessage());}} else if (throwable instanceof PackageParser.PackageParserException) {PackageParser.PackageParserException e = (PackageParser.PackageParserException)throwable;errorCode = e.error;Slog.w(TAG, "Failed to parse " + parseResult.scanFile + ": " + e.getMessage());} else {throw new IllegalStateException("Unexpected exception occurred while parsing "+ parseResult.scanFile, throwable);}// Delete invalid userdata appsif ((scanFlags & SCAN_AS_SYSTEM) == 0 &&errorCode != PackageManager.INSTALL_SUCCEEDED) {logCriticalInfo(Log.WARN,"Deleting invalid package at " + parseResult.scanFile);removeCodePathLI(parseResult.scanFile);}}}}

①：ParallelPackageParser类

class ParallelPackageParser implements AutoCloseable {private static final int QUEUE_CAPACITY = 10;private static final int MAX_THREADS = 4;private final String[] mSeparateProcesses;private final boolean mOnlyCore;private final DisplayMetrics mMetrics;private final File mCacheDir;private final PackageParser.Callback mPackageParserCallback;private volatile String mInterruptedInThread;private final BlockingQueue<ParseResult> mQueue = new ArrayBlockingQueue<>(QUEUE_CAPACITY);private final ExecutorService mService = ConcurrentUtils.newFixedThreadPool(MAX_THREADS,"package-parsing-thread", Process.THREAD_PRIORITY_FOREGROUND);ParallelPackageParser(String[] separateProcesses, boolean onlyCoreApps,DisplayMetrics metrics, File cacheDir, PackageParser.Callback callback) {mSeparateProcesses = separateProcesses;mOnlyCore = onlyCoreApps;mMetrics = metrics;mCacheDir = cacheDir;mPackageParserCallback = callback;}static class ParseResult {PackageParser.Package pkg; // Parsed packageFile scanFile; // File that was parsedThrowable throwable; // Set if an error occurs during parsing@Overridepublic String toString() {return "ParseResult{" +"pkg=" + pkg +", scanFile=" + scanFile +", throwable=" + throwable +'}';}}/*** Take the parsed package from the parsing queue, waiting if necessary until the element* appears in the queue.* @return parsed package*/public ParseResult take() {try {if (mInterruptedInThread != null) {throw new InterruptedException("Interrupted in " + mInterruptedInThread);}return mQueue.take();} catch (InterruptedException e) {// We cannot recover from interrupt hereThread.currentThread().interrupt();throw new IllegalStateException(e);}}/*** Submits the file for parsing* @param scanFile file to scan* @param parseFlags parse falgs*/public void submit(File scanFile, int parseFlags) {mService.submit(() -> {ParseResult pr = new ParseResult();Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "parallel parsePackage [" + scanFile + "]");try {PackageParser pp = new PackageParser();pp.setSeparateProcesses(mSeparateProcesses);pp.setOnlyCoreApps(mOnlyCore);pp.setDisplayMetrics(mMetrics);pp.setCacheDir(mCacheDir);pp.setCallback(mPackageParserCallback);pr.scanFile = scanFile;pr.pkg = parsePackage(pp, scanFile, parseFlags);} catch (Throwable e) {pr.throwable = e;} finally {Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);}try {mQueue.put(pr);} catch (InterruptedException e) {Thread.currentThread().interrupt();// Propagate result to callers of take().// This is helpful to prevent main thread from getting stuck waiting on// ParallelPackageParser to finish in case of interruptionmInterruptedInThread = Thread.currentThread().getName();}});}@VisibleForTestingprotected PackageParser.Package parsePackage(PackageParser packageParser, File scanFile,int parseFlags) throws PackageParser.PackageParserException {return packageParser.parsePackage(scanFile, parseFlags, true /* useCaches */);}@Overridepublic void close() {List<Runnable> unfinishedTasks = mService.shutdownNow();if (!unfinishedTasks.isEmpty()) {throw new IllegalStateException("Not all tasks finished before calling close: "+ unfinishedTasks);}}
}

1、该类增加了线程池，异步解析包数据
2、线程池的最大线程数量是4个
3、android 8.0及以后加上了异步解析包，这样就有效的减少了启动时间

扫描用户APP阶段

 if (!mOnlyCore) {EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_DATA_SCAN_START,SystemClock.uptimeMillis());scanDirTracedLI(sAppInstallDir, 0, scanFlags | SCAN_REQUIRE_KNOWN, 0);// Remove disable package settings for updated system apps that were// removed via an OTA. If the update is no longer present, remove the// app completely. Otherwise, revoke their system privileges.for (int i = possiblyDeletedUpdatedSystemApps.size() - 1; i >= 0; --i) {final String packageName = possiblyDeletedUpdatedSystemApps.get(i);final PackageParser.Package pkg = mPackages.get(packageName);final String msg;// remove from the disabled system list; do this first so any future// scans of this package are performed without this statemSettings.removeDisabledSystemPackageLPw(packageName);if (pkg == null) {// should have found an update, but, we didn't; remove everythingmsg = "Updated system package " + packageName+ " no longer exists; removing its data";// Actual deletion of code and data will be handled by later// reconciliation step} else {// found an update; revoke system privilegesmsg = "Updated system package " + packageName+ " no longer exists; rescanning package on data";// NOTE: We don't do anything special if a stub is removed from the// system image. But, if we were [like removing the uncompressed// version from the /data partition], this is where it'd be done.// remove the package from the system and re-scan it without any// special privilegesremovePackageLI(pkg, true);try {final File codePath = new File(pkg.applicationInfo.getCodePath());scanPackageTracedLI(codePath, 0, scanFlags, 0, null);} catch (PackageManagerException e) {Slog.e(TAG, "Failed to parse updated, ex-system package: "+ e.getMessage());}}// one final check. if we still have a package setting [ie. it was// previously scanned and known to the system], but, we don't have// a package [ie. there was an error scanning it from the /data// partition], completely remove the package data.final PackageSetting ps = mSettings.mPackages.get(packageName);if (ps != null && mPackages.get(packageName) == null) {removePackageDataLIF(ps, null, null, 0, false);}logCriticalInfo(Log.WARN, msg);}/** Make sure all system apps that we expected to appear on* the userdata partition actually showed up. If they never* appeared, crawl back and revive the system version.*/for (int i = 0; i < mExpectingBetter.size(); i++) {final String packageName = mExpectingBetter.keyAt(i);if (!mPackages.containsKey(packageName)) {final File scanFile = mExpectingBetter.valueAt(i);logCriticalInfo(Log.WARN, "Expected better " + packageName+ " but never showed up; reverting to system");final @ParseFlags int reparseFlags;final @ScanFlags int rescanFlags;if (FileUtils.contains(privilegedAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(systemAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM;} else if (FileUtils.contains(privilegedVendorAppDir, scanFile)|| FileUtils.contains(privilegedOdmAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(vendorAppDir, scanFile)|| FileUtils.contains(odmAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_VENDOR;} else if (FileUtils.contains(oemAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_OEM;} else if (FileUtils.contains(privilegedProductAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(productAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT;} else if (FileUtils.contains(privilegedProductServicesAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES| SCAN_AS_PRIVILEGED;} else if (FileUtils.contains(productServicesAppDir, scanFile)) {reparseFlags =mDefParseFlags |PackageParser.PARSE_IS_SYSTEM_DIR;rescanFlags =scanFlags| SCAN_AS_SYSTEM| SCAN_AS_PRODUCT_SERVICES;} else {Slog.e(TAG, "Ignoring unexpected fallback path " + scanFile);continue;}mSettings.enableSystemPackageLPw(packageName);try {scanPackageTracedLI(scanFile, reparseFlags, rescanFlags, 0, null);} catch (PackageManagerException e) {Slog.e(TAG, "Failed to parse original system package: "+ e.getMessage());}}}// Uncompress and install any stubbed system applications.// This must be done last to ensure all stubs are replaced or disabled.installSystemStubPackages(stubSystemApps, scanFlags);final int cachedNonSystemApps = PackageParser.sCachedPackageReadCount.get()- cachedSystemApps;final long dataScanTime = SystemClock.uptimeMillis() - systemScanTime - startTime;final int dataPackagesCount = mPackages.size() - systemPackagesCount;Slog.i(TAG, "Finished scanning non-system apps. Time: " + dataScanTime+ " ms, packageCount: " + dataPackagesCount+ " , timePerPackage: "+ (dataPackagesCount == 0 ? 0 : dataScanTime / dataPackagesCount)+ " , cached: " + cachedNonSystemApps);if (mIsUpgrade && dataPackagesCount > 0) {MetricsLogger.histogram(null, "ota_package_manager_data_app_avg_scan_time",((int) dataScanTime) / dataPackagesCount);}}mExpectingBetter.clear();// Resolve the storage manager.mStorageManagerPackage = getStorageManagerPackageName();// Resolve protected action filters. Only the setup wizard is allowed to// have a high priority filter for these actions.mSetupWizardPackage = getSetupWizardPackageName();mComponentResolver.fixProtectedFilterPriorities();mSystemTextClassifierPackage = getSystemTextClassifierPackageName();mWellbeingPackage = getWellbeingPackageName();mDocumenterPackage = getDocumenterPackageName();mConfiguratorPackage = getDeviceConfiguratorPackageName();mAppPredictionServicePackage = getAppPredictionServicePackageName();mIncidentReportApproverPackage = getIncidentReportApproverPackageName();// Now that we know all of the shared libraries, update all clients to have// the correct library paths.updateAllSharedLibrariesLocked(null, Collections.unmodifiableMap(mPackages));for (SharedUserSetting setting : mSettings.getAllSharedUsersLPw()) {// NOTE: We ignore potential failures here during a system scan (like// the rest of the commands above) because there's precious little we// can do about it. A settings error is reported, though.final List<String> changedAbiCodePath =adjustCpuAbisForSharedUserLPw(setting.packages, null /*scannedPackage*/);if (changedAbiCodePath != null && changedAbiCodePath.size() > 0) {for (int i = changedAbiCodePath.size() - 1; i >= 0; --i) {final String codePathString = changedAbiCodePath.get(i);try {mInstaller.rmdex(codePathString,getDexCodeInstructionSet(getPreferredInstructionSet()));} catch (InstallerException ignored) {}}}// Adjust seInfo to ensure apps which share a sharedUserId are placed in the same// SELinux domain.setting.fixSeInfoLocked();}// Now that we know all the packages we are keeping,// read and update their last usage times.mPackageUsage.read(mPackages);mCompilerStats.read();EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SCAN_END,SystemClock.uptimeMillis());Slog.i(TAG, "Time to scan packages: "+ ((SystemClock.uptimeMillis()-startTime)/1000f)+ " seconds");

1、在普通模式下，还需要扫描/data/app以及/data/app_private目录

PKMS收尾

 final boolean sdkUpdated = (ver.sdkVersion != mSdkVersion);if (sdkUpdated) {Slog.i(TAG, "Platform changed from " + ver.sdkVersion + " to "+ mSdkVersion + "; regranting permissions for internal storage");}mPermissionManager.updateAllPermissions(StorageManager.UUID_PRIVATE_INTERNAL, sdkUpdated, mPackages.values(),mPermissionCallback);ver.sdkVersion = mSdkVersion;// If this is the first boot or an update from pre-M, and it is a normal// boot, then we need to initialize the default preferred apps across// all defined users.if (!onlyCore && (mPromoteSystemApps || mFirstBoot)) {for (UserInfo user : sUserManager.getUsers(true)) {mSettings.applyDefaultPreferredAppsLPw(user.id);primeDomainVerificationsLPw(user.id);}}// Prepare storage for system user really early during boot,// since core system apps like SettingsProvider and SystemUI// can't wait for user to startfinal int storageFlags;if (StorageManager.isFileEncryptedNativeOrEmulated()) {storageFlags = StorageManager.FLAG_STORAGE_DE;} else {storageFlags = StorageManager.FLAG_STORAGE_DE | StorageManager.FLAG_STORAGE_CE;}List<String> deferPackages = reconcileAppsDataLI(StorageManager.UUID_PRIVATE_INTERNAL,UserHandle.USER_SYSTEM, storageFlags, true /* migrateAppData */,true /* onlyCoreApps */);mPrepareAppDataFuture = SystemServerInitThreadPool.get().submit(() -> {TimingsTraceLog traceLog = new TimingsTraceLog("SystemServerTimingAsync",Trace.TRACE_TAG_PACKAGE_MANAGER);traceLog.traceBegin("AppDataFixup");try {mInstaller.fixupAppData(StorageManager.UUID_PRIVATE_INTERNAL,StorageManager.FLAG_STORAGE_DE | StorageManager.FLAG_STORAGE_CE);} catch (InstallerException e) {Slog.w(TAG, "Trouble fixing GIDs", e);}traceLog.traceEnd();traceLog.traceBegin("AppDataPrepare");if (deferPackages == null || deferPackages.isEmpty()) {return;}int count = 0;for (String pkgName : deferPackages) {PackageParser.Package pkg = null;synchronized (mPackages) {PackageSetting ps = mSettings.getPackageLPr(pkgName);if (ps != null && ps.getInstalled(UserHandle.USER_SYSTEM)) {pkg = ps.pkg;}}if (pkg != null) {synchronized (mInstallLock) {prepareAppDataAndMigrateLIF(pkg, UserHandle.USER_SYSTEM, storageFlags,true /* maybeMigrateAppData */);}count++;}}traceLog.traceEnd();Slog.i(TAG, "Deferred reconcileAppsData finished " + count + " packages");}, "prepareAppData");// If this is first boot after an OTA, and a normal boot, then// we need to clear code cache directories.// Note that we do *not* clear the application profiles. These remain valid// across OTAs and are used to drive profile verification (post OTA) and// profile compilation (without waiting to collect a fresh set of profiles).if (mIsUpgrade && !onlyCore) {Slog.i(TAG, "Build fingerprint changed; clearing code caches");for (int i = 0; i < mSettings.mPackages.size(); i++) {final PackageSetting ps = mSettings.mPackages.valueAt(i);if (Objects.equals(StorageManager.UUID_PRIVATE_INTERNAL, ps.volumeUuid)) {// No apps are running this early, so no need to freezeclearAppDataLIF(ps.pkg, UserHandle.USER_ALL,FLAG_STORAGE_DE | FLAG_STORAGE_CE | FLAG_STORAGE_EXTERNAL| Installer.FLAG_CLEAR_CODE_CACHE_ONLY);}}ver.fingerprint = Build.FINGERPRINT;}// Grandfather existing (installed before Q) non-system apps to hide// their icons in launcher.if (!onlyCore && mIsPreQUpgrade) {Slog.i(TAG, "Whitelisting all existing apps to hide their icons");int size = mSettings.mPackages.size();for (int i = 0; i < size; i++) {final PackageSetting ps = mSettings.mPackages.valueAt(i);if ((ps.pkgFlags & ApplicationInfo.FLAG_SYSTEM) != 0) {continue;}ps.disableComponentLPw(PackageManager.APP_DETAILS_ACTIVITY_CLASS_NAME,UserHandle.USER_SYSTEM);}}// clear only after permissions and other defaults have been updatedmExistingSystemPackages.clear();mPromoteSystemApps = false;// All the changes are done during package scanning.ver.databaseVersion = Settings.CURRENT_DATABASE_VERSION;// can downgrade to readerTrace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "write settings");mSettings.writeLPr();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_READY,SystemClock.uptimeMillis());if (!mOnlyCore) {mRequiredVerifierPackage = getRequiredButNotReallyRequiredVerifierLPr();mRequiredInstallerPackage = getRequiredInstallerLPr();mRequiredUninstallerPackage = getRequiredUninstallerLPr();mIntentFilterVerifierComponent = getIntentFilterVerifierComponentNameLPr();if (mIntentFilterVerifierComponent != null) {mIntentFilterVerifier = new IntentVerifierProxy(mContext,mIntentFilterVerifierComponent);} else {mIntentFilterVerifier = null;}mServicesSystemSharedLibraryPackageName = getRequiredSharedLibraryLPr(PackageManager.SYSTEM_SHARED_LIBRARY_SERVICES,SharedLibraryInfo.VERSION_UNDEFINED);mSharedSystemSharedLibraryPackageName = getRequiredSharedLibraryLPr(PackageManager.SYSTEM_SHARED_LIBRARY_SHARED,SharedLibraryInfo.VERSION_UNDEFINED);} else {mRequiredVerifierPackage = null;mRequiredInstallerPackage = null;mRequiredUninstallerPackage = null;mIntentFilterVerifierComponent = null;mIntentFilterVerifier = null;mServicesSystemSharedLibraryPackageName = null;mSharedSystemSharedLibraryPackageName = null;}// PermissionController hosts default permission granting and role management, so it's a// critical part of the core system.mRequiredPermissionControllerPackage = getRequiredPermissionControllerLPr();// Initialize InstantAppRegistry's Instant App list for all users.final int[] userIds = UserManagerService.getInstance().getUserIds();for (PackageParser.Package pkg : mPackages.values()) {if (pkg.isSystem()) {continue;}for (int userId : userIds) {final PackageSetting ps = (PackageSetting) pkg.mExtras;if (ps == null || !ps.getInstantApp(userId) || !ps.getInstalled(userId)) {continue;}mInstantAppRegistry.addInstantAppLPw(userId, ps.appId);}}mInstallerService = new PackageInstallerService(context, this, mApexManager);final Pair<ComponentName, String> instantAppResolverComponent =getInstantAppResolverLPr();if (instantAppResolverComponent != null) {if (DEBUG_INSTANT) {Slog.d(TAG, "Set ephemeral resolver: " + instantAppResolverComponent);}mInstantAppResolverConnection = new InstantAppResolverConnection(mContext, instantAppResolverComponent.first,instantAppResolverComponent.second);mInstantAppResolverSettingsComponent =getInstantAppResolverSettingsLPr(instantAppResolverComponent.first);} else {mInstantAppResolverConnection = null;mInstantAppResolverSettingsComponent = null;}updateInstantAppInstallerLocked(null);// Read and update the usage of dex files.// Do this at the end of PM init so that all the packages have their// data directory reconciled.// At this point we know the code paths of the packages, so we can validate// the disk file and build the internal cache.// The usage file is expected to be small so loading and verifying it// should take a fairly small time compare to the other activities (e.g. package// scanning).final Map<Integer, List<PackageInfo>> userPackages = new HashMap<>();for (int userId : userIds) {userPackages.put(userId, getInstalledPackages(/*flags*/ 0, userId).getList());}mDexManager.load(userPackages);if (mIsUpgrade) {MetricsLogger.histogram(null, "ota_package_manager_init_time",(int) (SystemClock.uptimeMillis() - startTime));}} // synchronized (mPackages)} // synchronized (mInstallLock)mModuleInfoProvider = new ModuleInfoProvider(mContext, this);// Now after opening every single application zip, make sure they// are all flushed.  Not really needed, but keeps things nice and// tidy.Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "GC");Runtime.getRuntime().gc();Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);// The initial scanning above does many calls into installd while// holding the mPackages lock, but we're mostly interested in yelling// once we have a booted system.mInstaller.setWarnIfHeld(mPackages);PackageParser.readConfigUseRoundIcon(mContext.getResources());mServiceStartWithDelay = SystemClock.uptimeMillis() + (60 * 1000L);Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);