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Commit c724f220 authored by Neil Fuller's avatar Neil Fuller Committed by android-build-merger
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Merge "Add support for ICU data pinning in the Zygote" am: 9b1d6441 

am: 8491b4c0

* commit '8491b4c0':
  Add support for ICU data pinning in the Zygote

Change-Id: I64ba8a96ab8990a051a68cbdb35f4b1de3738d09
parents d1d0c558 8491b4c0

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

+30 −0
Original line number Diff line number Diff line
@@ -22,6 +22,9 @@ import static android.system.OsConstants.S_IRWXO; 


import android.content.res.Resources;

import android.content.res.TypedArray;

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;
@@ -186,6 +189,9 @@ public class ZygoteInit { 


    static void preload() {

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

        Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "BeginIcuCachePinning");

        beginIcuCachePinning();

        Trace.traceEnd(Trace.TRACE_TAG_DALVIK);

        Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadClasses");

        preloadClasses();

        Trace.traceEnd(Trace.TRACE_TAG_DALVIK);
@@ -200,10 +206,34 @@ public class ZygoteInit { 
        // Ask the WebViewFactory to do any initialization that must run in the zygote process,

        // for memory sharing purposes.

        WebViewFactory.prepareWebViewInZygote();

        endIcuCachePinning();

        warmUpJcaProviders();

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

    }



    private static void beginIcuCachePinning() {

        // Pin ICU data in memory from this point that would normally be held by soft references.

        // Without this, any references created immediately below or during class preloading

        // would be collected when the Zygote GC runs in gcAndFinalize().

        Log.i(TAG, "Installing ICU cache reference pinning...");



        CacheValue.setStrength(CacheValue.Strength.STRONG);



        Log.i(TAG, "Preloading ICU data...");

        // Explicitly exercise code to cache data apps are likely to need.

        ULocale[] localesToPin = { ULocale.ROOT, ULocale.US, ULocale.getDefault() };

        for (ULocale uLocale : localesToPin) {

            new DecimalFormatSymbols(uLocale);

        }

    }



    private static void endIcuCachePinning() {

        // All cache references created by ICU from this point will be soft.

        CacheValue.setStrength(CacheValue.Strength.SOFT);



        Log.i(TAG, "Uninstalled ICU cache reference pinning...");

    }



    private static void preloadSharedLibraries() {

        Log.i(TAG, "Preloading shared libraries...");

        System.loadLibrary("android");