On Mon, May 01, 2023 at 12:27:55PM -0700, Vishal Moola (Oracle) wrote:

The MM subsystem is trying to shrink struct page. This patchset
introduces a memory descriptor for page table tracking - struct ptdesc.

This patchset introduces ptdesc, splits ptdesc from struct page, and
converts many callers of page table constructor/destructors to use ptdescs.

Lightly related food for future thought - based on some discussions at
LSF/MM it would be really nice if an end result of this was that a
rcu_head was always available in the ptdesc so we don't need to
allocate memory to free a page table.

Jason

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