Zygote: Restore GL preload

Preloading GLES drivers in Zygote was removed previously since it is
incompatible with updatable drivers. That caused some app startup
latency and system memory use regressions. This change re-adds GLES
driver preloading, but only on devices that don't support driver
updates.

Bug: 34611670
Bug: 35052548
Test: boot angler, systrace of Calculator app startup
Change-Id: Ibdc6b3c0ba4473574722641d4bfad4b375f908a3
(cherry picked from commit ba0370eef3d17baa70d43723e96eb135c8e4ed58)

diff --git a/core/java/com/android/internal/os/ZygoteInit.java b/core/java/com/android/internal/os/ZygoteInit.java
index 2a1a476..85fc8b0 100644 (file)
--- a/core/java/com/android/internal/os/ZygoteInit.java
+++ b/core/java/com/android/internal/os/ZygoteInit.java
@@ -26,6 +26,7 @@ import android.icu.impl.CacheValue;
 import android.icu.text.DecimalFormatSymbols;
 import android.icu.util.ULocale;
 import android.net.LocalServerSocket;
+import android.opengl.EGL14;
 import android.os.Process;
 import android.os.SystemClock;
 import android.os.SystemProperties;
@@ -79,6 +80,7 @@ public class ZygoteInit {
     private static final String TAG = "Zygote";
 
     private static final String PROPERTY_DISABLE_OPENGL_PRELOADING = "ro.zygote.disable_gl_preload";
+    private static final String PROPERTY_GFX_DRIVER = "ro.gfx.driver.0";
     private static final String PROPERTY_RUNNING_IN_CONTAINER = "ro.boot.container";
 
     private static final String ANDROID_SOCKET_PREFIX = "ANDROID_SOCKET_";
@@ -198,6 +200,9 @@ public class ZygoteInit {
         Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadResources");
         preloadResources();
         Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
+        Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadOpenGL");
+        preloadOpenGL();
+        Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
         preloadSharedLibraries();
         preloadTextResources();
         // Ask the WebViewFactory to do any initialization that must run in the zygote process,
@@ -238,6 +243,14 @@ public class ZygoteInit {
         System.loadLibrary("jnigraphics");
     }
 
+    private static void preloadOpenGL() {
+        String driverPackageName = SystemProperties.get(PROPERTY_GFX_DRIVER);
+        if (!SystemProperties.getBoolean(PROPERTY_DISABLE_OPENGL_PRELOADING, false) ||
+                driverPackageName == null || driverPackageName.isEmpty()) {
+            EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY);
+        }
+    }
+
     private static void preloadTextResources() {
         Hyphenator.init();
         TextView.preloadFontCache();