Re: [LSF/MM/BPF TOPIC] 64k (or 16k) base page size on x86

[Matthew Wilcox]

On Thu, Feb 19, 2026 at 03:08:51PM +0000, Kiryl Shutsemau wrote:
> On x86, page tables are allocated from the buddy allocator and if PG_SIZE
> is greater than 4 KB, we need a way to pack multiple page tables into a
> single page. We could use the slab allocator for this, but it would
> require relocating the page-table metadata out of struct page.

Have you looked at the s390/ppc implementations (yes, they're different,
no, that sucks)?  slab seems like the wrong approach to me.

There's a third approach that I've never looked at which is to allocate
the larger size, then just use it for N consecutive entries.