Linux内存管理与虚拟内存技术深度解析

The "Linux操作系统课程指导：Ch12 Memory Management.ppt" presentation covers various aspects of memory management in the Linux operating system. It includes topics such as Paging, Page Table, Segmentation, Virtual Memory, Page Replacement, and Memory Allocation. In memory management, the system uses the Memory Management Unit (MMU) to manage memory allocation and access. The system divides memory into pages, typically 4KB for 32-bit systems and 8KB for 64-bit systems. Each page has flags that determine its attributes. The presentation also discusses Zones, which categorize memory based on its usage and accessibility. It explains how the system acquires pages for memory allocation and how the Slab layer optimizes memory allocation by reusing memory blocks. The presentation compares the functions of Kmalloc() and Vmalloc() for dynamic memory allocation and explains the benefits and drawbacks of each method. It also covers the concept of Statically Allocating on the Stack. Additionally, the presentation talks about High Memory Mappings, which allow the system to access memory beyond the 4GB limit in 32-bit systems. It also explains the use of Per-CPU Variables for efficient memory access and management. In conclusion, the presentation provides a comprehensive overview of memory management in Linux operating systems, highlighting the importance of efficient memory allocation, access, and utilization for optimal system performance.