设计和实现关于内存管理的内存布局初始化及内存申请分配、内存回收等基本功能操作函数，用了最佳替换算法Optional、先进先出（FIFO）页面置换算法、最近久未使用(LRU)置换算法、Clock 算法（也叫Second Chance 算法）-Design and implementation of memory layout application initialization and memory allocation, memory recall about memory management and other basic functions operating functions with optimal replacement algorithm Optional, first in first out (FIFO) page replacement algorithm, recently Recently Used (LRU) replacement algorithm, Clock algorithm (also called Second Chance algorithm)