commit 52613f9084f40100021fbf21173bda329a2d5cc3
author Rahul Chaturvedi <rkc@google.com> Wed Jun 17 23:54:08 2015 -0400
committer Rahul Chaturvedi <rkc@google.com> Mon Jun 22 16:28:24 2015 -0400
tree 76f285a5ac4375f74053fa9251e88f0c5c6ec535
parent 6186e89c382f2d02037ffd1fe579f065e1578521

Add binder transaction tracking.

Add the ability to am to be able to track binder transact calls. This
will help us diagnose excessive IPC calls.

This CL adds the trace-ip command to am. The usage is,

To start binder transaction tracking,
am trace-ipc start
To stop tracking and dump the data to a file,
am trace-ipc stop --dump-file <FILE>

Bug: 21398706
Change-Id: Ic0c9b3be757dd0662a2750a0d8447e2a5ef1fa90

core/java/android/app/ActivityManagerNative.java

diff --git a/core/java/android/app/ActivityManagerNative.java b/core/java/android/app/ActivityManagerNative.java
index 6ae21eb..07b9ebe 100644
--- a/core/java/android/app/ActivityManagerNative.java
+++ b/core/java/android/app/ActivityManagerNative.java
@@ -2554,6 +2554,24 @@
             reply.writeInt(res ? 1 : 0);
             return true;
         }
+
+        case START_BINDER_TRACKING_TRANSACTION: {
+            data.enforceInterface(IActivityManager.descriptor);
+            boolean res = startBinderTracking();
+            reply.writeNoException();
+            reply.writeInt(res ? 1 : 0);
+            return true;
+        }
+
+        case STOP_BINDER_TRACKING_AND_DUMP_TRANSACTION: {
+            data.enforceInterface(IActivityManager.descriptor);
+            ParcelFileDescriptor fd = data.readInt() != 0
+                    ? ParcelFileDescriptor.CREATOR.createFromParcel(data) : null;
+            boolean res = stopBinderTrackingAndDump(fd);
+            reply.writeNoException();
+            reply.writeInt(res ? 1 : 0);
+            return true;
+        }
         }
 
         return super.onTransact(code, data, reply, flags);
@@ -5505,6 +5523,36 @@
         reply.recycle();
     }
 
+    public boolean startBinderTracking() throws RemoteException {
+        Parcel data = Parcel.obtain();
+        Parcel reply = Parcel.obtain();
+        data.writeInterfaceToken(IActivityManager.descriptor);
+        mRemote.transact(START_BINDER_TRACKING_TRANSACTION, data, reply, 0);
+        reply.readException();
+        boolean res = reply.readInt() != 0;
+        reply.recycle();
+        data.recycle();
+        return res;
+    }
+
+    public boolean stopBinderTrackingAndDump(ParcelFileDescriptor fd) throws RemoteException {
+        Parcel data = Parcel.obtain();
+        Parcel reply = Parcel.obtain();
+        data.writeInterfaceToken(IActivityManager.descriptor);
+        if (fd != null) {
+            data.writeInt(1);
+            fd.writeToParcel(data, Parcelable.PARCELABLE_WRITE_RETURN_VALUE);
+        } else {
+            data.writeInt(0);
+        }
+        mRemote.transact(STOP_BINDER_TRACKING_AND_DUMP_TRANSACTION, data, reply, 0);
+        reply.readException();
+        boolean res = reply.readInt() != 0;
+        reply.recycle();
+        data.recycle();
+        return res;
+    }
+
     @Override
     public IActivityContainer createStackOnDisplay(int displayId) throws RemoteException {
         Parcel data = Parcel.obtain();