或许有人不解：一篇论文而已，何至于此？难道比未来求职更艰难？这问题我难以简单回应。但我想，这或许是性质不同的两种压力。若非要找寻关联，那么论文带来的焦虑，很大程度上正是源于对未来的忧虑——寒窗苦读多年，若因论文未达要求而让即将到手的机会付诸东流，这难道不正是最令人惶恐的事吗？
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The key insight, and the thing that took me a while to fully appreciate, is that virtual memory mappings do not need to have physical pages behind them immediately. When a process calls mmap to allocate a region of memory, the kernel sets up a Virtual Memory Area (VMA) in the process’s address space. This VMA describes the region and includes its start address, length, permissions, and what backs it, whether that is anonymous memory, a file, shared memory, or something else. But the kernel does not allocate physical pages yet. The page table entries for that region simply do not exist.