Some problem about ParseJstack

[DQinYuan]

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 27 in 49d6b37

public class ParseJStack {

• exception with dead-lock info with jstack -l

"GC task thread#9 (ParallelGC)" os_prio=31 tid=0x00007fb63e01a800 nid=0x5203 runnable 

"VM Periodic Task Thread" os_prio=31 tid=0x00007fb63f81a800 nid=0x7403 waiting on condition 

JNI global references: 15


Found one Java-level deadlock:
=============================
"Thread-1":
  waiting to lock monitor 0x00007fb63f8162e8 (object 0x000000076ac1bc98, a java.lang.String),
  which is held by "Thread-0"
"Thread-0":
  waiting to lock monitor 0x00007fb63f815528 (object 0x000000076ac1bcc8, a java.lang.String),
  which is held by "Thread-1"

Java stack information for the threads listed above:
===================================================
"Thread-1":
	at com.alibaba.jstacktest.DeadLockSyncTest$LockB.run(DeadLockSyncTest.java:42)
	- waiting to lock <0x000000076ac1bc98> (a java.lang.String)
	- locked <0x000000076ac1bcc8> (a java.lang.String)
	at java.lang.Thread.run(Thread.java:750)
"Thread-0":
	at com.alibaba.jstacktest.DeadLockSyncTest$LockA.run(DeadLockSyncTest.java:23)
	- waiting to lock <0x000000076ac1bcc8> (a java.lang.String)
	- locked <0x000000076ac1bc98> (a java.lang.String)
	at java.lang.Thread.run(Thread.java:750)

Found 1 deadlock.

• not exclude socketWrite0 from running Threads
• should not skip fixed lines except running, becasue we already know of stack from classification

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 263 in 49d6b37

jsp.insertJavaMethod(waitingThreads, 2);

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 269 in 49d6b37

jsp.insertJavaMethod(sleepingThreads, 2);

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 282 in 49d6b37

jsp.insertJavaMethod(waitingThreads, 2);

• if top of jstack is not jdk inner method, should skip it

JavaPerformanceTuning/FirstEdition/JStack/src/net/sdo/ParseJStack.java

Line 187 in 49d6b37

private void skipJavaClasses() throws IOException {

• missing io write classification
• missing some important top of stack about net work write read。like PlainDatagramSocketImpl.receive0, PlainDatagramSocketImpl.send0 etc.