Re: Why are the PAGE_SIZE and the physical page frame size different in x86_64 kernel?

Each entry in a PMD table covers 2M - and either describes a 2M hugepage, or is a pointer to a table of PTE entries, each of which describes a 4K page. Many Thanks! This explanation helps me a lot. I didn't know 4KB and 2MB page frames can exist at the same time:)

Regards, Hao Lee