寫入時複製(Page protection that allows multiple applications to map their virtual address spaces to share the same physical pages until an application needs to modify the page and have its own instance copy, which allows the virtual memory manager to save memory and execution time)
copy on write Page protection that allows multiple applications to map their virtual address spaces to share the same physical pages until an application needs to modify the page and have its own instance copy, which allows the virtual memory manager to save memory and execution time
