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Commit 81568c5c authored by Wei Wang's avatar Wei Wang Committed by Ricardo Cerqueira
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GC triggering performance optimizations 

Copy the correct starting heap size at process init.
Interfaces to set GC/managed heap parameters.

Change-Id: I0154d1523c3cfdb1214ed0315193cbb24704351f
parent 6356a2e2

core/java/android/app/ActivityThread.java

+33 −0
Original line number Diff line number Diff line
@@ -124,6 +124,9 @@ import libcore.io.EventLogger; 
import libcore.io.IoUtils;



import dalvik.system.CloseGuard;

import dalvik.system.VMRuntime;

import android.os.SystemProperties;

import java.lang.*;



final class RemoteServiceException extends AndroidRuntimeException {

    public RemoteServiceException(String msg) {
@@ -4116,6 +4119,36 @@ public final class ActivityThread { 


        // send up app name; do this *before* waiting for debugger

        Process.setArgV0(data.processName);



        String str  = SystemProperties.get("dalvik.vm.heaputilization", "" );

        if( !str.equals("") ){

            float heapUtil = Float.valueOf(str.trim()).floatValue();

            VMRuntime.getRuntime().setTargetHeapUtilization(heapUtil);

            Log.d(TAG, "setTargetHeapUtilization:" + str );

        }

        int heapMinFree  = SystemProperties.getInt("dalvik.vm.heapMinFree", 0 );

        if( heapMinFree > 0 ){

            VMRuntime.getRuntime().setTargetHeapMinFree(heapMinFree);

            Log.d(TAG, "setTargetHeapMinFree:" + heapMinFree );

        }

        int heapConcurrentStart  = SystemProperties.getInt("dalvik.vm.heapconcurrentstart", 0 );

        if( heapConcurrentStart > 0 ){

            VMRuntime.getRuntime().setTargetHeapConcurrentStart(heapConcurrentStart);

            Log.d(TAG, "setTargetHeapConcurrentStart:" + heapConcurrentStart );

        }



        ////

        ////If want to set application specific GC paramters, can use

        ////the following check

        ////

        //if( data.processName.equals("com.android.gallery3d")) {

        //    VMRuntime.getRuntime().setTargetHeapUtilization(0.25f);

        //    VMRuntime.getRuntime().setTargetHeapMinFree(12*1024*1024);

        //    VMRuntime.getRuntime().setTargetHeapConcurrentStart(4*1024*1024);

        //}







        android.ddm.DdmHandleAppName.setAppName(data.processName,

                                                UserHandle.myUserId());