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update jvm

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`@@ -305,6 +305,7 @@ HotSpot JVM把年轻代分为了三部分:1个Eden区和2个Survivor区(分`
`305`	`305`	`### JVM性能监控`
`306`	`306`
`307`	`307`	`1. JDK的命令行工具`
	`308`	`+`
`308`	`309`	`* jps(虚拟机进程状况工具):jps可以列出正在运行的虚拟机进程,并显示虚拟机执行主类(Main Class,main()函数所在的类)名称以及这些进程的本地虚拟机唯一ID(Local Virtual Machine Identifier,LVMID)。`
`309`	`310`	`* jstat(虚拟机统计信息监视工具):jstat是用于监视虚拟机各种运行状态信息的命令行工具。它可以显示本地或者远程虚拟机进程中的类装载、内存、垃圾收集、JIT编译等运行数据。`
`310`	`311`	`* jinfo(Java配置信息工具):jinfo的作用是实时地查看和调整虚拟机各项参数。`

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