Merge "ZygoteInit: warm up JCA providers during preload" am: aa733e0b41

am: ef42102cf8

* commit 'ef42102cf8d0dd238deb1871bef07f9646622a91':
  ZygoteInit: warm up JCA providers during preload

Change-Id: I7c8ed5394af0c6e1fd25b289ca615125c4e3c38e

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

@@ -240,6 +240,24 @@ public class ZygoteInit {
         Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
     }
 
+    /**
+     * Warm up the providers that are already registered.
+     *
+     * By doing it here we avoid that each app does it when requesting a service from the
+     * provider for the first time.
+     */
+    private static void warmUpJcaProviders() {
+        long startTime = SystemClock.uptimeMillis();
+        Trace.traceBegin(
+                Trace.TRACE_TAG_DALVIK, "Starting warm up of JCA providers");
+        for (Provider p : Security.getProviders()) {
+            p.warmUpServiceProvision();
+        }
+        Log.i(TAG, "Warmed up JCA providers in "
+                + (SystemClock.uptimeMillis()-startTime) + "ms.");
+        Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
+    }
+
     /**
      * Performs Zygote process initialization. Loads and initializes
      * commonly used classes.