[tyingq]

This one from Torvalds is close to clickbait, at least it made me want to find and read copy_page_range().

"Fork is rather simple, once you get the hang of it, but the memory management can be a bitch. See 'mm/memory.c': 'copy_page_range()'"

https://github.com/torvalds/linux/blob/master/kernel/fork.c#...