The article provides a detailed overview of how process memory works in Linux, particularly on x86-64 architecture. It breaks down the illusion of a continuous memory space that programs operate within, explaining how Linux manages memory in pages. When a program accesses a memory address, the CPU checks the page table for a corresponding entry. If it finds none, a page fault occurs, prompting the kernel to allocate memory and update the page table. This process allows Linux to efficiently use physical RAM, moving less-frequently used pages to disk when memory is limited. Key components like virtual memory areas (VMAs) and page tables are central to this memory management. Each process has a singular object representing its address space, with VMAs defining ranges of memory with specific permissions. System calls like `mmap`, `mprotect`, and `munmap` allow processes to define, modify, or remove these memory regions. The article emphasizes the importance of proper alignment when creating file mappings and details how memory access rights are enforced, potentially leading to errors if violated. The discussion extends to how memory is managed during process operations like `fork`. Instead of duplicating pages, the child process shares the same physical pages as the parent until a write occurs, at which point a copy-on-write mechanism kicks in. This conserves resources by avoiding unnecessary duplication until absolutely needed. The article also looks at minor and major page faults, which indicate whether data was already in RAM or required additional I/O, impacting performance. These concepts illustrate the intricate workings of memory management within the Linux kernel and how it balances efficiency with the need for process isolation and protection.