Android/frameworks_base
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add hook for JVMTI agent in system server

Browse Source 
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
Merged-In: I299dffb1774fdce48b9b695a614b7ab60f1307e2
(cherry picked from commit 1a88539df2)
This commit is contained in:
David Sehr
2019-11-27 16:24:06 -08:00
parent 0e3e2a73c6
commit 8f3eee0466
1 changed files with 19 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
services/java/com/android/server/SystemServer.java
View File

@@ -40,12 +40,12 @@ import android.database.sqlite.SQLiteCompatibilityWalFlags;
import android.database.sqlite.SQLiteGlobal;
import android.hardware.display.DisplayManagerInternal;
import android.net.ConnectivityModuleConnector;
import android.net.Network;
import android.net.NetworkStackClient;
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;
@@ -497,6 +497,24 @@ public final class SystemServer {
LocalServices.addService(SystemServiceManager.class, mSystemServiceManager);
// Prepare the thread pool for init tasks that can be parallelized
SystemServerInitThreadPool.get();
// 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 {
traceEnd(); // InitBeforeStartServices
}