init

JVM_memory_layout.drawio

@@ -0,0 +1,999 @@
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Readme.md

@@ -0,0 +1,94 @@
+# JVM内存布局
+
+## 总体内存概念布局
+
+1. 线程私有数据
+
+   - 虚拟机栈
+
+   > 记录Java方法调用顺序,每调用一个方法,就会向栈中压入一个栈帧,栈帧中记录着局部变量表、操作数栈、动态链接、方法出口等信息
+
+   - 本地方法栈
+
+   > 记录native方法调用顺序,每调用一个Native方法,就会向栈中压入一个栈帧,栈帧中记录着局部变量表、操作数栈、动态链接、方法出口等信息
+
+   - 程序计数器
+
+   > 记录当前线程字节码指令执行的行号
+
+2. 线程共享数据
+
+   - 堆
+
+   > 存储所有的类实例和数组,是JVM中占用内存最多的区域,垃圾回收主要也是在这个区域
+
+   - 方法区
+
+   > 存储Java的类元数据和运行时常量池,包括所有的类信息、常量、类变量、动态编译缓存等
+
+![总体内存布局](http://tuchuang.anyi.space/imgs/JVM%E5%86%85%E5%AD%98%E5%88%92%E5%88%86-JVM%E5%86%85%E5%AD%98%E5%B8%83%E5%B1%80%E5%AE%8F%E8%A7%82%E6%A6%82%E5%BF%B5%E5%88%92%E5%88%86.png)
+
+## 虚拟机栈
+
+虚拟机栈就是一个非常关键的部分，看名字就知道它是一个栈结构，每个方法被执行的时候，Java虚拟机都会同步创建一个栈帧（其实就是栈里面的一个元素），栈帧中包括了当前方法的一些信息，比如局部变量表、操作数栈、动态链接、方法出口等。
+
+![虚拟机栈](http://tuchuang.anyi.space/imgs/JVM%E5%86%85%E5%AD%98%E5%88%92%E5%88%86-%E8%99%9A%E6%8B%9F%E6%9C%BA%E6%A0%88.png)
+
+## 本地方法栈
+
+与虚拟机栈结构类似
+
+## 堆
+
+>  堆结构在JDK1.8前后有改变,JDK1.8前堆中的永久代是方法区的实现,之后方法区使用元空间实现,不在堆内存中,使用直接内存不属于JVM内存
+
+堆内存被划分三部分新生代、老年代、永久代;JDK1.8及之后为两部分,只有新生代和老年代,永久代被元空间取代
+
+> 元空间在直接内存中,不属于JVM的内存
+
+在HotSpot虚拟机中，新生代被划分为三块，一块较大的Eden空间和两块较小的Survivor空间，默认比例为8：1：1，老年代的GC评率相对较低，永久代一般存放类信息等（其实就是方法区的实现）
+
+所有新创建的对象，在一开始都会进入到新生代的Eden区（如果是大对象会被直接丢进老年代）
+
+在一次垃圾回收之后，Eden区域没有被回收的对象，会进入到Survivor区。在一开始From和To都是空的，而GC之后，所有Eden区域存活的对象都会直接被放入到From区，最后From和To会发生一次交换，也就是说目前存放我们对象的From区，变为To区，而To区变为From区
+
+在Eden区的存活对象复制到From区之后，所有To区域中的对象会进行年龄判定（每经历一轮GC年龄`+1`，如果对象的年龄大于`默认值为15`，那么会直接进入到老年代，否则移动到From区）
+
+垃圾收集分为：
+
+- Minor GC - 次要垃圾回收，主要进行新生代区域的垃圾收集。
+  - 触发条件：新生代的Eden区容量已满时。
+- Major GC - 主要垃圾回收，主要进行老年代的垃圾收集。
+- Full GC - 完全垃圾回收，对整个Java堆内存和方法区进行垃圾回收。
+  - 触发条件1：每次晋升到老年代的对象平均大小大于老年代剩余空间
+  - 触发条件2：Minor GC后存活的对象超过了老年代剩余空间
+  - 触发条件3：永久代内存不足（JDK8之前）
+  - 触发条件4：手动调用`System.gc()`方法
+
+### JDK1.8前
+
+![堆-JDK1.8前](http://tuchuang.anyi.space/imgs/JVM%E5%86%85%E5%AD%98%E5%88%92%E5%88%86-%E5%A0%86-JDK1.8%E5%89%8D.png)
+
+### JDK1.8
+
+![堆-JDK1.8](http://tuchuang.anyi.space/imgs/JVM%E5%86%85%E5%AD%98%E5%88%92%E5%88%86-%E5%A0%86-JDK1.8.png)
+
+## 方法区
+
+方法区也是整个Java应用程序共享的区域，它用于存储所有的类信息、常量、静态变量、动态编译缓存等数据，可以大致分为两个部分，一个是类信息表，一个是运行时常量池。
+
+![方法区](http://tuchuang.anyi.space/imgs/JVM%E5%86%85%E5%AD%98%E5%88%92%E5%88%86-%E6%96%B9%E6%B3%95%E5%8C%BA.png)
+
+## 完整JVM内存布局
+
+### JDK1.8前
+
+![完整JVM内存布局-JDK1.8前](http://tuchuang.anyi.space/imgs/JVM%E5%86%85%E5%AD%98%E5%88%92%E5%88%86-%E5%86%85%E5%AD%98%E5%B8%83%E5%B1%80-JDK1.8%E5%89%8D.png)
+
+### JDK1.8
+
+![完整JVM内存布局-JDK1.8及以后](http://tuchuang.anyi.space/imgs/JVM%E5%86%85%E5%AD%98%E5%88%92%E5%88%86-%E5%86%85%E5%AD%98%E5%B8%83%E5%B1%80-JDK1.8%E5%BC%80%E5%A7%8B.png)
+
+## 参考资料
+
+[柏码知识库 | JVM 笔记（二）内存管理](https://www.itbaima.cn/zh-CN/document/ydd7n3jg8unc3clg)