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Commit 1a7ba996 authored by Chris Li's avatar Chris Li Committed by Andrii Kulian
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Preload WindowManager Extensions to improve startup performance 

WindowManager Extensions is an optional shared library that is required
for WindowManager Jetpack to fully function. Add it to the class loaders
so that it can improve the apps startup performance.

Bug: 269966257
Bug: 266268883
Test: Build and measure the system tracing
Change-Id: I496bb04a06fcd78d4bf246c13528e508c7e0025a
parent 2a523ecc

core/java/android/app/ApplicationLoaders.java

+4 −4
Original line number Diff line number Diff line
@@ -157,15 +157,15 @@ public class ApplicationLoaders { 
     * All libraries in the closure of libraries to be loaded must be in libs. A library can

     * only depend on libraries that come before it in the list.

     */

    public void createAndCacheNonBootclasspathSystemClassLoaders(SharedLibraryInfo[] libs) {

    public void createAndCacheNonBootclasspathSystemClassLoaders(List<SharedLibraryInfo> libs) {

        if (mSystemLibsCacheMap != null) {

            throw new IllegalStateException("Already cached.");

        }



        mSystemLibsCacheMap = new HashMap<String, CachedClassLoader>();

        mSystemLibsCacheMap = new HashMap<>();



        for (SharedLibraryInfo lib : libs) {

            createAndCacheNonBootclasspathSystemClassLoader(lib);

        for (int i = 0; i < libs.size(); i++) {

            createAndCacheNonBootclasspathSystemClassLoader(libs.get(i));

        }

    }

core/java/com/android/internal/os/ZygoteInit.java

+33 −14
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ import android.util.EventLog; 
import android.util.Log;

import android.util.Slog;

import android.util.TimingsTraceLog;

import android.view.WindowManager;

import android.webkit.WebViewFactory;

import android.widget.TextView;
@@ -72,6 +73,8 @@ import java.io.InputStream; 
import java.io.InputStreamReader;

import java.security.Provider;

import java.security.Security;

import java.util.ArrayList;

import java.util.List;



/**

 * Startup class for the zygote process.
@@ -384,33 +387,49 @@ public class ZygoteInit { 
     * classpath.

     */

    private static void cacheNonBootClasspathClassLoaders() {

        // Ordered dependencies first

        final List<SharedLibraryInfo> libs = new ArrayList<>();

        // These libraries used to be part of the bootclasspath, but had to be removed.

        // Old system applications still get them for backwards compatibility reasons,

        // so they are cached here in order to preserve performance characteristics.

        SharedLibraryInfo hidlBase = new SharedLibraryInfo(

        libs.add(new SharedLibraryInfo(

                "/system/framework/android.hidl.base-V1.0-java.jar", null /*packageName*/,

                null /*codePaths*/, null /*name*/, 0 /*version*/, SharedLibraryInfo.TYPE_BUILTIN,

                null /*declaringPackage*/, null /*dependentPackages*/, null /*dependencies*/,

                false /*isNative*/);

        SharedLibraryInfo hidlManager = new SharedLibraryInfo(

                false /*isNative*/));

        libs.add(new SharedLibraryInfo(

                "/system/framework/android.hidl.manager-V1.0-java.jar", null /*packageName*/,

                null /*codePaths*/, null /*name*/, 0 /*version*/, SharedLibraryInfo.TYPE_BUILTIN,

                null /*declaringPackage*/, null /*dependentPackages*/, null /*dependencies*/,

                false /*isNative*/);

                false /*isNative*/));



        SharedLibraryInfo androidTestBase = new SharedLibraryInfo(

        libs.add(new SharedLibraryInfo(

                "/system/framework/android.test.base.jar", null /*packageName*/,

                null /*codePaths*/, null /*name*/, 0 /*version*/, SharedLibraryInfo.TYPE_BUILTIN,

                null /*declaringPackage*/, null /*dependentPackages*/, null /*dependencies*/,

                false /*isNative*/);



        ApplicationLoaders.getDefault().createAndCacheNonBootclasspathSystemClassLoaders(

                new SharedLibraryInfo[]{

                    // ordered dependencies first

                    hidlBase,

                    hidlManager,

                    androidTestBase,

                });

                false /*isNative*/));



        // WindowManager Extensions is an optional shared library that is required for WindowManager

        // Jetpack to fully function. Since it is a widely used library, preload it to improve apps

        // startup performance.

        if (WindowManager.hasWindowExtensionsEnabled()) {

            final String systemExtFrameworkPath =

                    new File(Environment.getSystemExtDirectory(), "framework").getPath();

            libs.add(new SharedLibraryInfo(

                    systemExtFrameworkPath + "/androidx.window.extensions.jar",

                    "androidx.window.extensions", null /*codePaths*/,

                    "androidx.window.extensions", SharedLibraryInfo.VERSION_UNDEFINED,

                    SharedLibraryInfo.TYPE_BUILTIN, null /*declaringPackage*/,

                    null /*dependentPackages*/, null /*dependencies*/, false /*isNative*/));

            libs.add(new SharedLibraryInfo(

                    systemExtFrameworkPath + "/androidx.window.sidecar.jar",

                    "androidx.window.sidecar", null /*codePaths*/,

                    "androidx.window.sidecar", SharedLibraryInfo.VERSION_UNDEFINED,

                    SharedLibraryInfo.TYPE_BUILTIN, null /*declaringPackage*/,

                    null /*dependentPackages*/, null /*dependencies*/, false /*isNative*/));

        }



        ApplicationLoaders.getDefault().createAndCacheNonBootclasspathSystemClassLoaders(libs);

    }



    /**

core/tests/coretests/src/android/app/ApplicationLoadersTest.java

+16 −14
Original line number Diff line number Diff line
@@ -16,14 +16,17 @@ 


package android.app;



import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertNotEquals;

import static org.junit.Assert.assertNotNull;

import static org.junit.Assert.assertNull;



import android.content.pm.SharedLibraryInfo;



import androidx.test.filters.SmallTest;

import androidx.test.runner.AndroidJUnit4;



import com.google.android.collect.Lists;



import org.junit.Test;

import org.junit.runner.RunWith;
@@ -48,7 +51,7 @@ public class ApplicationLoadersTest { 
    @Test

    public void testGetNonExistantLib() {

        ApplicationLoaders loaders = new ApplicationLoaders();

        assertEquals(null, loaders.getCachedNonBootclasspathSystemLib(

        assertNull(loaders.getCachedNonBootclasspathSystemLib(

                "/system/framework/nonexistantlib.jar", null, null, null));

    }
@@ -57,9 +60,9 @@ public class ApplicationLoadersTest { 
        ApplicationLoaders loaders = new ApplicationLoaders();

        SharedLibraryInfo libA = createLib(LIB_A);



        loaders.createAndCacheNonBootclasspathSystemClassLoaders(new SharedLibraryInfo[]{libA});

        loaders.createAndCacheNonBootclasspathSystemClassLoaders(Lists.newArrayList(libA));



        assertNotEquals(null, loaders.getCachedNonBootclasspathSystemLib(

        assertNotNull(loaders.getCachedNonBootclasspathSystemLib(

                LIB_A, null, null, null));

    }
@@ -71,9 +74,9 @@ public class ApplicationLoadersTest { 
        ClassLoader parent = ClassLoader.getSystemClassLoader();

        assertNotEquals(null, parent);



        loaders.createAndCacheNonBootclasspathSystemClassLoaders(new SharedLibraryInfo[]{libA});

        loaders.createAndCacheNonBootclasspathSystemClassLoaders(Lists.newArrayList(libA));



        assertEquals(null, loaders.getCachedNonBootclasspathSystemLib(

        assertNull(loaders.getCachedNonBootclasspathSystemLib(

                LIB_A, parent, null, null));

    }
@@ -82,9 +85,9 @@ public class ApplicationLoadersTest { 
        ApplicationLoaders loaders = new ApplicationLoaders();

        SharedLibraryInfo libA = createLib(LIB_A);



        loaders.createAndCacheNonBootclasspathSystemClassLoaders(new SharedLibraryInfo[]{libA});

        loaders.createAndCacheNonBootclasspathSystemClassLoaders(Lists.newArrayList(libA));



        assertEquals(null, loaders.getCachedNonBootclasspathSystemLib(

        assertNull(loaders.getCachedNonBootclasspathSystemLib(

                LIB_A, null, "other classloader", null));

    }
@@ -98,9 +101,9 @@ public class ApplicationLoadersTest { 
        ArrayList<ClassLoader> sharedLibraries = new ArrayList<>();

        sharedLibraries.add(dep);



        loaders.createAndCacheNonBootclasspathSystemClassLoaders(new SharedLibraryInfo[]{libA});

        loaders.createAndCacheNonBootclasspathSystemClassLoaders(Lists.newArrayList(libA));



        assertEquals(null, loaders.getCachedNonBootclasspathSystemLib(

        assertNull(loaders.getCachedNonBootclasspathSystemLib(

                LIB_A, null, null, sharedLibraries));

    }
@@ -112,7 +115,7 @@ public class ApplicationLoadersTest { 
        libB.addDependency(libA);



        loaders.createAndCacheNonBootclasspathSystemClassLoaders(

                new SharedLibraryInfo[]{libA, libB});

                Lists.newArrayList(libA, libB));



        ClassLoader loadA = loaders.getCachedNonBootclasspathSystemLib(

                LIB_A, null, null, null);
@@ -121,7 +124,7 @@ public class ApplicationLoadersTest { 
        ArrayList<ClassLoader> sharedLibraries = new ArrayList<>();

        sharedLibraries.add(loadA);



        assertNotEquals(null, loaders.getCachedNonBootclasspathSystemLib(

        assertNotNull(loaders.getCachedNonBootclasspathSystemLib(

                LIB_DEP_A, null, null, sharedLibraries));

    }
@@ -132,7 +135,6 @@ public class ApplicationLoadersTest { 
        SharedLibraryInfo libB = createLib(LIB_DEP_A);

        libB.addDependency(libA);



        loaders.createAndCacheNonBootclasspathSystemClassLoaders(

                new SharedLibraryInfo[]{libB, libA});

        loaders.createAndCacheNonBootclasspathSystemClassLoaders(Lists.newArrayList(libB, libA));

    }

}