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Commit 28f2e4b4 authored by Jared Duke's avatar Jared Duke
Browse files

Support preload of location/media system libs 

These libraries are loaded in ~10% of cold process starts, and
preloading yields modest improvements to both app startup latency
and memory, particularly for lower-end devices.

Add support for preloading these libraries behind a new flag:
  com.android.internal.os.enable_media_and_location_preload

Bug: 241474956
Test: m + ART benchmark service
Test: atest FrameworksCoreTests:android.app.ApplicationLoadersTest
Test: abtd + boottime_test_atrace_debug + boot trace inspection
Flag: com.android.internal.os.enable_media_and_location_preload
Change-Id: Ie75aa0d38555b6e5b71be9d535d58fe328c55893
parent 9e935923

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

+21 −0
Original line number Diff line number Diff line
@@ -429,6 +429,27 @@ public class ZygoteInit { 
                    null /*dependentPackages*/, null /*dependencies*/, false /*isNative*/));

        }



        if (Flags.enableMediaAndLocationPreload()) {

            // As these libraries are technically optional and not necessarily inherited from

            // base_system.mk, only cache them if they exist.

            final String mediaJarPath = "/system/framework/com.android.media.remotedisplay.jar";

            if (new File(mediaJarPath).exists()) {

                libs.add(new SharedLibraryInfo(

                        mediaJarPath, null /*packageName*/,

                        null /*codePaths*/, null /*name*/, 0 /*version*/,

                        SharedLibraryInfo.TYPE_BUILTIN, null /*declaringPackage*/,

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

            }

            final String locationJarPath = "/system/framework/com.android.location.provider.jar";

            if (new File(locationJarPath).exists()) {

                libs.add(new SharedLibraryInfo(

                        locationJarPath, null /*packageName*/,

                        null /*codePaths*/, null /*name*/, 0 /*version*/,

                        SharedLibraryInfo.TYPE_BUILTIN, null /*declaringPackage*/,

                        null /*dependentPackages*/, null /*dependencies*/, 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.

core/java/com/android/internal/os/flags.aconfig

+7 −0
Original line number Diff line number Diff line
@@ -52,6 +52,13 @@ flag { 
    bug: "241474956"

}



flag {

    name: "enable_media_and_location_preload"

    namespace: "system_performance"

    description: "Enables zygote preload of non-BCP media and location libraries."

    bug: "241474956"

}



flag {

    name: "use_transaction_codes_for_unknown_methods"

    namespace: "stability"