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Commit b3eecebd authored by Mathieu Chartier's avatar Mathieu Chartier
Browse files

Enable profiling for system server for userdebug|eng 

Only for these two configurations since selinux permissions only
allow system_server to access profiles in these cases.

Motivation is to allow collecting profiles for improving RAM and
performance for preopt.

Setting the property dalvik.vm.profilesystemserver to true is required
to enable the collection of profiles for system server.

Test: device boots

Bug: 34927277
Bug: 36457259

Change-Id: Icbba6dafe376fd9c6c3d0c7feba7f64009f7c2c3
parent c9fa6399

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

+20 −0
Original line number Diff line number Diff line
@@ -26,7 +26,9 @@ import android.icu.text.DecimalFormatSymbols; 
import android.icu.util.ULocale;

import android.net.LocalServerSocket;

import android.opengl.EGL14;

import android.os.Build;

import android.os.IInstalld;

import android.os.Environment;

import android.os.Process;

import android.os.RemoteException;

import android.os.Seccomp;
@@ -60,6 +62,7 @@ import dalvik.system.ZygoteHooks; 
import libcore.io.IoUtils;



import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;
@@ -457,6 +460,23 @@ public class ZygoteInit { 
        final String systemServerClasspath = Os.getenv("SYSTEMSERVERCLASSPATH");

        if (systemServerClasspath != null) {

            performSystemServerDexOpt(systemServerClasspath);

            // Capturing profiles is only supported for debug or eng builds since selinux normally

            // prevents it.

            boolean profileSystemServer = SystemProperties.getBoolean(

                    "dalvik.vm.profilesystemserver", false);

            if (profileSystemServer && (Build.IS_USERDEBUG || Build.IS_ENG)) {

                try {

                    File profileDir = Environment.getDataProfilesDePackageDirectory(

                            Process.SYSTEM_UID, "system_server");

                    File profile = new File(profileDir, "primary.prof");

                    profile.getParentFile().mkdirs();

                    profile.createNewFile();

                    String[] codePaths = systemServerClasspath.split(":");

                    VMRuntime.registerAppInfo(profile.getPath(), codePaths);

                } catch (Exception e) {

                    Log.wtf(TAG, "Failed to set up system server profile", e);

                }

            }

        }



        if (parsedArgs.invokeWith != null) {