Re: [PATCH v2 00/34] Split ptdesc from struct page

Jason Gunthorpe <[email protected]>
Newsgroups gmane.linux.ports.riscv,gmane.linux.kernel.mm,gmane.linux.kernel.cross-arch,gmane.linux.ports.arm.kernel,gmane.linux.ports.hexagon,gmane.linux.ports.mips,gmane.linux.ports.ppc64.devel,gmane.linux.ports.sh.devel,gmane.linux.ports.sparc,gmane.linux.uml.devel,gmane.comp.emulators.xen.devel,gmane.comp.emulators.kvm.devel
Message-ID <[email protected]> 
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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