Record data about dex files use on disk (b8976d8f) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/pm/PackageManagerService.java

+27 −1

Original line number	Diff line number	Diff line
		@@ -260,6 +260,7 @@ import com.android.server.pm.Installer.InstallerException;
		import com.android.server.pm.PermissionsState.PermissionState;
		import com.android.server.pm.Settings.DatabaseVersion;
		import com.android.server.pm.Settings.VersionInfo;
		import com.android.server.pm.dex.DexManager;
		import com.android.server.storage.DeviceStorageMonitorInternal;

		import dalvik.system.CloseGuard;
		@@ -303,6 +304,7 @@ import java.util.Collections;
		import java.util.Comparator;
		import java.util.Date;
		import java.util.HashSet;
		import java.util.HashMap;
		import java.util.Iterator;
		import java.util.List;
		import java.util.Map;
		@@ -748,6 +750,9 @@ public class PackageManagerService extends IPackageManager.Stub {
		final PackageInstallerService mInstallerService;

		private final PackageDexOptimizer mPackageDexOptimizer;
		// DexManager handles the usage of dex files (e.g. secondary files, whether or not a package
		// is used by other apps).
		private final DexManager mDexManager;

		private AtomicInteger mNextMoveId = new AtomicInteger();
		private final MoveCallbacks mMoveCallbacks;
		@@ -2165,6 +2170,7 @@ public class PackageManagerService extends IPackageManager.Stub {
		mInstaller = installer;
		mPackageDexOptimizer = new PackageDexOptimizer(installer, mInstallLock, context,
		"dexopt");
		mDexManager = new DexManager();
		mMoveCallbacks = new MoveCallbacks(FgThread.get().getLooper());

		mOnPermissionChangeListeners = new OnPermissionChangeListeners(
		@@ -2616,6 +2622,19 @@ public class PackageManagerService extends IPackageManager.Stub {
		mPackageUsage.read(mPackages);
		mCompilerStats.read();

		// Read and update the usage of dex files.
		// 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<>();
		final int[] currentUserIds = UserManagerService.getInstance().getUserIds();
		for (int userId : currentUserIds) {
		userPackages.put(userId, getInstalledPackages(/flags/ 0, userId).getList());
		}
		mDexManager.load(userPackages);

		EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_PMS_SCAN_END,
		SystemClock.uptimeMillis());
		Slog.i(TAG, "Time to scan packages: "
		@@ -7642,7 +7661,14 @@ public class PackageManagerService extends IPackageManager.Stub {

		@Override
		public void notifyDexLoad(String loadingPackageName, List<String> dexPaths, String loaderIsa) {
		// TODO(calin): b/32871170
		int userId = UserHandle.getCallingUserId();
		ApplicationInfo ai = getApplicationInfo(loadingPackageName, /flags/ 0, userId);
		if (ai == null) {
		Slog.w(TAG, "Loading a package that does not exist for the calling user. package="
		+ loadingPackageName + ", user=" + userId);
		return;
		}
		mDexManager.notifyDexLoad(ai, dexPaths, loaderIsa, userId);
		}

		// TODO: this is not used nor needed. Delete it.

services/core/java/com/android/server/pm/dex/DexManager.java

0 → 100644

+324 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2016 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License
		*/

		package com.android.server.pm.dex;

		import android.content.pm.PackageInfo;
		import android.content.pm.PackageParser;
		import android.content.pm.ApplicationInfo;

		import android.util.Slog;

		import com.android.server.pm.PackageManagerServiceUtils;

		import java.io.File;
		import java.io.IOException;
		import java.util.List;
		import java.util.HashMap;
		import java.util.HashSet;
		import java.util.Map;
		import java.util.Set;

		/**
		* This class keeps track of how dex files are used.
		* Every time it gets a notification about a dex file being loaded it tracks
		* its owning package and records it in PackageDexUsage (package-dex-usage.list).
		*
		* TODO(calin): Extract related dexopt functionality from PackageManagerService
		* into this class.
		*/
		public class DexManager {
		private static final String TAG = "DexManager";

		private static final boolean DEBUG = false;

		// Maps package name to code locations.
		// It caches the code locations for the installed packages. This allows for
		// faster lookups (no locks) when finding what package owns the dex file.
		private final Map<String, PackageCodeLocations> mPackageCodeLocationsCache;

		// PackageDexUsage handles the actual I/O operations. It is responsible to
		// encode and save the dex usage data.
		private final PackageDexUsage mPackageDexUsage;

		// Possible outcomes of a dex search.
		private static int DEX_SEARCH_NOT_FOUND = 0; // dex file not found
		private static int DEX_SEARCH_FOUND_PRIMARY = 1; // dex file is the primary/base apk
		private static int DEX_SEARCH_FOUND_SPLIT = 2; // dex file is a split apk
		private static int DEX_SEARCH_FOUND_SECONDARY = 3; // dex file is a secondary dex

		public DexManager() {
		mPackageCodeLocationsCache = new HashMap<>();
		mPackageDexUsage = new PackageDexUsage();
		}

		/**
		* Notify about dex files loads.
		* Note that this method is invoked when apps load dex files and it should
		* return as fast as possible.
		*
		* @param loadingPackage the package performing the load
		* @param dexPaths the list of dex files being loaded
		* @param loaderIsa the ISA of the app loading the dex files
		* @param loaderUserId the user id which runs the code loading the dex files
		*/
		public void notifyDexLoad(ApplicationInfo loadingAppInfo, List<String> dexPaths,
		String loaderIsa, int loaderUserId) {
		try {
		notifyDexLoadInternal(loadingAppInfo, dexPaths, loaderIsa, loaderUserId);
		} catch (Exception e) {
		Slog.w(TAG, "Exception while notifying dex load for package " +
		loadingAppInfo.packageName, e);
		}
		}

		private void notifyDexLoadInternal(ApplicationInfo loadingAppInfo, List<String> dexPaths,
		String loaderIsa, int loaderUserId) {
		if (!PackageManagerServiceUtils.checkISA(loaderIsa)) {
		Slog.w(TAG, "Loading dex files " + dexPaths + " in unsupported ISA: " +
		loaderIsa + "?");
		return;
		}

		for (String dexPath : dexPaths) {
		// Find the owning package name.
		DexSearchResult searchResult = getDexPackage(loadingAppInfo, dexPath, loaderUserId);

		if (DEBUG) {
		Slog.i(TAG, loadingAppInfo.packageName
		+ " loads from " + searchResult + " : " + loaderUserId + " : " + dexPath);
		}

		if (searchResult.mOutcome != DEX_SEARCH_NOT_FOUND) {
		// TODO(calin): extend isUsedByOtherApps check to detect the cases where
		// different apps share the same runtime. In that case we should not mark the dex
		// file as isUsedByOtherApps. Currently this is a safe approximation.
		boolean isUsedByOtherApps = !loadingAppInfo.packageName.equals(
		searchResult.mOwningPackageName);
		boolean primaryOrSplit = searchResult.mOutcome == DEX_SEARCH_FOUND_PRIMARY \|\|
		searchResult.mOutcome == DEX_SEARCH_FOUND_SPLIT;

		if (primaryOrSplit && !isUsedByOtherApps) {
		// If the dex file is the primary apk (or a split) and not isUsedByOtherApps
		// do not record it. This case does not bring any new usable information
		// and can be safely skipped.
		continue;
		}

		// Record dex file usage. If the current usage is a new pattern (e.g. new secondary,
		// or UsedBytOtherApps), record will return true and we trigger an async write
		// to disk to make sure we don't loose the data in case of a reboot.
		if (mPackageDexUsage.record(searchResult.mOwningPackageName,
		dexPath, loaderUserId, loaderIsa, isUsedByOtherApps, primaryOrSplit)) {
		mPackageDexUsage.maybeWriteAsync();
		}
		} else {
		// This can happen in a few situations:
		// - bogus dex loads
		// - recent installs/uninstalls that we didn't detect.
		// - new installed splits
		// If we can't find the owner of the dex we simply do not track it. The impact is
		// that the dex file will not be considered for offline optimizations.
		// TODO(calin): add hooks for install/uninstall notifications to
		// capture new or obsolete packages.
		if (DEBUG) {
		Slog.i(TAG, "Could not find owning package for dex file: " + dexPath);
		}
		}
		}
		}

		/**
		* Read the dex usage from disk and populate the code cache locations.
		* @param existingPackages a map containing information about what packages
		* are available to what users. Only packages in this list will be
		* recognized during notifyDexLoad().
		*/
		public void load(Map<Integer, List<PackageInfo>> existingPackages) {
		try {
		loadInternal(existingPackages);
		} catch (Exception e) {
		mPackageDexUsage.clear();
		Slog.w(TAG, "Exception while loading package dex usage. " +
		"Starting with a fresh state.", e);
		}
		}

		private void loadInternal(Map<Integer, List<PackageInfo>> existingPackages) {
		Map<String, Set<Integer>> packageToUsersMap = new HashMap<>();
		// Cache the code locations for the installed packages. This allows for
		// faster lookups (no locks) when finding what package owns the dex file.
		for (Map.Entry<Integer, List<PackageInfo>> entry : existingPackages.entrySet()) {
		List<PackageInfo> packageInfoList = entry.getValue();
		int userId = entry.getKey();
		for (PackageInfo pi : packageInfoList) {
		// Cache the code locations.
		PackageCodeLocations pcl = mPackageCodeLocationsCache.get(pi.packageName);
		if (pcl != null) {
		pcl.mergeAppDataDirs(pi.applicationInfo, userId);
		} else {
		mPackageCodeLocationsCache.put(pi.packageName,
		new PackageCodeLocations(pi.applicationInfo, userId));
		}
		// Cache a map from package name to the set of user ids who installed the package.
		// We will use it to sync the data and remove obsolete entries from
		// mPackageDexUsage.
		Set<Integer> users = putIfAbsent(
		packageToUsersMap, pi.packageName, new HashSet<>());
		users.add(userId);
		}
		}

		mPackageDexUsage.read();
		mPackageDexUsage.syncData(packageToUsersMap);
		}

		/**
		* Get the package dex usage for the given package name.
		* @return the package data or null if there is no data available for this package.
		*/
		public PackageDexUsage.PackageUseInfo getPackageUseInfo(String packageName) {
		return mPackageDexUsage.getPackageUseInfo(packageName);
		}

		/**
		* Retrieves the package which owns the given dexPath.
		*/
		private DexSearchResult getDexPackage(
		ApplicationInfo loadingAppInfo, String dexPath, int userId) {
		// Ignore framework code.
		// TODO(calin): is there a better way to detect it?
		if (dexPath.startsWith("/system/framework/")) {
		new DexSearchResult("framework", DEX_SEARCH_NOT_FOUND);
		}

		// First, check if the package which loads the dex file actually owns it.
		// Most of the time this will be true and we can return early.
		PackageCodeLocations loadingPackageCodeLocations =
		new PackageCodeLocations(loadingAppInfo, userId);
		int outcome = loadingPackageCodeLocations.searchDex(dexPath, userId);
		if (outcome != DEX_SEARCH_NOT_FOUND) {
		// TODO(calin): evaluate if we bother to detect symlinks at the dexPath level.
		return new DexSearchResult(loadingPackageCodeLocations.mPackageName, outcome);
		}

		// The loadingPackage does not own the dex file.
		// Perform a reverse look-up in the cache to detect if any package has ownership.
		// Note that we can have false negatives if the cache falls out of date.
		for (PackageCodeLocations pcl : mPackageCodeLocationsCache.values()) {
		outcome = pcl.searchDex(dexPath, userId);
		if (outcome != DEX_SEARCH_NOT_FOUND) {
		return new DexSearchResult(pcl.mPackageName, outcome);
		}
		}

		// Cache miss. Return not found for the moment.
		//
		// TODO(calin): this may be because of a newly installed package, an update
		// or a new added user. We can either perform a full look up again or register
		// observers to be notified of package/user updates.
		return new DexSearchResult(null, DEX_SEARCH_NOT_FOUND);
		}

		private static <K,V> V putIfAbsent(Map<K,V> map, K key, V newValue) {
		V existingValue = map.putIfAbsent(key, newValue);
		return existingValue == null ? newValue : existingValue;
		}

		/**
		* Convenience class to store the different locations where a package might
		* own code.
		*/
		private static class PackageCodeLocations {
		private final String mPackageName;
		private final String mBaseCodePath;
		private final Set<String> mSplitCodePaths;
		// Maps user id to the application private directory.
		private final Map<Integer, Set<String>> mAppDataDirs;

		public PackageCodeLocations(ApplicationInfo ai, int userId) {
		mPackageName = ai.packageName;
		mBaseCodePath = ai.sourceDir;
		mSplitCodePaths = new HashSet<>();
		if (ai.splitSourceDirs != null) {
		for (String split : ai.splitSourceDirs) {
		mSplitCodePaths.add(split);
		}
		}
		mAppDataDirs = new HashMap<>();
		mergeAppDataDirs(ai, userId);
		}

		public void mergeAppDataDirs(ApplicationInfo ai, int userId) {
		Set<String> dataDirs = putIfAbsent(mAppDataDirs, userId, new HashSet<>());
		dataDirs.add(ai.dataDir);

		// Compute and cache the real path as well since data dir may be a symlink.
		// e.g. /data/data/ -> /data/user/0/
		try {
		dataDirs.add(PackageManagerServiceUtils.realpath(new File(ai.dataDir)));
		} catch (IOException e) {
		Slog.w(TAG, "Error to get realpath of " + ai.dataDir, e);
		}

		}

		public int searchDex(String dexPath, int userId) {
		// First check that this package is installed or active for the given user.
		// If we don't have a data dir it means this user is trying to load something
		// unavailable for them.
		Set<String> userDataDirs = mAppDataDirs.get(userId);
		if (userDataDirs == null) {
		Slog.w(TAG, "Trying to load a dex path which does not exist for the current " +
		"user. dexPath=" + dexPath + ", userId=" + userId);
		return DEX_SEARCH_NOT_FOUND;
		}

		if (mBaseCodePath.equals(dexPath)) {
		return DEX_SEARCH_FOUND_PRIMARY;
		}
		if (mSplitCodePaths.contains(dexPath)) {
		return DEX_SEARCH_FOUND_SPLIT;
		}
		for (String dataDir : userDataDirs) {
		if (dexPath.startsWith(dataDir)) {
		return DEX_SEARCH_FOUND_SECONDARY;
		}
		}
		return DEX_SEARCH_NOT_FOUND;
		}
		}

		/**
		* Convenience class to store ownership search results.
		*/
		private class DexSearchResult {
		private String mOwningPackageName;
		private int mOutcome;

		public DexSearchResult(String owningPackageName, int outcome) {
		this.mOwningPackageName = owningPackageName;
		this.mOutcome = outcome;
		}

		@Override
		public String toString() {
		return mOwningPackageName + "-" + mOutcome;
		}
		}


		}

services/tests/servicestests/src/com/android/server/pm/dex/DexManagerTests.java

0 → 100644

+282 −0

File added.

Preview size limit exceeded, changes collapsed.