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Commit b07595d1 authored by Sergio Giro's avatar Sergio Giro
Browse files

ZygoteInit: warm up JCA providers during preload 

This makes the time spent in the first call of an app to
SSLSocketFactory.getDefault() drop from ~240 ms to ~50 ms. In M
it was around ~6ms. This is due to the fact that, while instantiating
the default factory, all providers are initialized.

In order to obtain the timings above, I created an app calling
SSLSocketFactory.getDefault in onCreate and timed it
with System.currentTimeMillis() .

(cherry picked from commit 6cb7b1c4)

Bug: 28545496

Change-Id: Ic5aab3ece609d9fef06fee4ccb83d8371af075b2
parent a5ca0ca8

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

+21 −0
Original line number Diff line number Diff line
@@ -52,6 +52,8 @@ import java.io.InputStream; 
import java.io.InputStreamReader;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.security.Security;

import java.security.Provider;

import java.util.ArrayList;



/**
@@ -193,6 +195,7 @@ public class ZygoteInit { 
        // Ask the WebViewFactory to do any initialization that must run in the zygote process,

        // for memory sharing purposes.

        WebViewFactory.prepareWebViewInZygote();

        warmUpJcaProviders();

        Log.d(TAG, "end preload");

    }
@@ -213,6 +216,24 @@ public class ZygoteInit { 
        Hyphenator.init();

    }



    /**

     * 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.