SWT／ANR问题－－当发送ANR/SWT时候如何打开binder trace(BinderTraces)

问题描述：

由于绑定事务，我们经常遇到一些系统看门狗(或ANR)问题。 此时，在获得绑定器跟踪日志后，对我们分析问题非常有帮助。  

在本文档中，我们介绍如何在发生看门狗(或ANR)时启用绑定跟踪(BinderTraces)日志。 

解决方案： 

 1. 当ANR发生时，文件名为“BinderTraces_pid__.txt”

2. 当发生WATCHDOG时，文件名是为“BinderTraces_pid_.txt”

3. Patches:

1) diff --git a/services/core/java/com/android/server/Watchdog.java
b/services/core/java/com/android/server/Watchdog.java
index c04c2ac..0f58746 100644
--- a/services/core/java/com/android/server/Watchdog.java
+++ b/services/core/java/com/android/server/Watchdog.java
@@ -515,7 +515,7 @@ public class Watchdog extends Thread {
//Collect Binder State logs to get status of all the transactions
if (Build.IS_DEBUGGABLE) { //Note： the "ro.debuggable" system property must be set to
"1", then the binder trace log will be enabled
- binderStateRead();
+ binderStateRead(String.valueOf(Process.myPi