Two Pages Of Copying
A process maps 1 GiB of private anonymous memory and writes to all of it, so every page is resident. It then calls fork(). The child writes one byte at offset 0 and one byte at offset 700 MiB, then calls _exit.
Pages are 4 KiB and transparent huge pages are off. How many 4 KiB pages of that region does the kernel copy?
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