The procedure documentation system that records your methods permanently
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The first time the process actually reads or writes to an address in that region, the MMU tries to translate the virtual address and finds no page table entry. This triggers a page fault, which is a CPU exception that transfers control to the kernel’s page fault handler. The kernel looks up the faulting address in the process’s VMA list, sees that it is a valid mapping (not a segfault), allocates a physical page, fills it with zeros for anonymous memory or reads the data from the backing file for file-backed mappings, installs a page table entry pointing the virtual address at the new physical page, and returns to the faulting instruction, which re-executes and succeeds.