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Commit 1a88539d authored by David Sehr's avatar David Sehr
Browse files

Add hook for JVMTI agent in system server 

Add a place to attach a jvmti agent into the system server in debug
builds.  This allows profiling and other investigations for performance
improvements.

Bug: none
Test: attach agent, collect result
Change-Id: I299dffb1774fdce48b9b695a614b7ab60f1307e2
parent 43c56ce7

services/java/com/android/server/SystemServer.java

+19 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ import android.net.TetheringManager; 
import android.os.BaseBundle;

import android.os.Binder;

import android.os.Build;

import android.os.Debug;

import android.os.Environment;

import android.os.FactoryTest;

import android.os.FileUtils;
@@ -502,6 +503,24 @@ public final class SystemServer { 
            LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);

            // Prepare the thread pool for init tasks that can be parallelized

            SystemServerInitThreadPool.start();

            // Attach JVMTI agent if this is a debuggable build and the system property is set.

            if (Build.IS_DEBUGGABLE) {

                // Property is of the form "library_path=parameters".

                String jvmtiAgent = SystemProperties.get("persist.sys.dalvik.jvmtiagent");

                if (!jvmtiAgent.isEmpty()) {

                    int equalIndex = jvmtiAgent.indexOf('=');

                    String libraryPath = jvmtiAgent.substring(0, equalIndex);

                    String parameterList =

                            jvmtiAgent.substring(equalIndex + 1, jvmtiAgent.length());

                    // Attach the agent.

                    try {

                        Debug.attachJvmtiAgent(libraryPath, parameterList, null);

                    } catch (Exception e) {

                        Slog.e("System", "*************************************************");

                        Slog.e("System", "********** Failed to load jvmti plugin: " + jvmtiAgent);

                    }

                }

            }

        } finally {

            t.traceEnd();  // InitBeforeStartServices

        }