[OLK-6.6] mm/rmap: interface overhaul

mm/rmap: interface overhaul
https://lore.kernel.org/linux-mm/20231220224504.646757-1-david@redhat.com/

I ran some simple microbenchmarks on an Intel(R) Xeon(R) Silver 4210R:
measuring munmap(), fork(), cow, MADV_DONTNEED on each PTE ... and PTE
remapping PMD-mapped THPs on 1 GiB of memory.

For small folios, there is barely a change (< 1% improvement for me).

For PTE-mapped THP:

PTE-remapping a PMD-mapped THP is more than 10% faster.
fork() is more than 4% faster.
MADV_DONTNEED is 2% faster
COW when writing only a single byte on a COW-shared PTE is 1% faster
munmap() barely changes (< 1%).

Some khugepaged folio conversions[backport dependence]
https://lore.kernel.org/linux-mm/20231020183331.10770-1-vishal.moola@gmail.com/

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