linux-kernel - Re: [PATCH v1 0/9] mm: vm_normal

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Message-Id: <20250715163126.7bcaca25364dd68835bd9c8b@linux-foundation.org>
Date: Tue, 15 Jul 2025 16:31:26 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 xen-devel@...ts.xenproject.org, linux-fsdevel@...r.kernel.org,
 nvdimm@...ts.linux.dev, Juergen Gross <jgross@...e.com>, Stefano Stabellini
 <sstabellini@...nel.org>, Oleksandr Tyshchenko
 <oleksandr_tyshchenko@...m.com>, Dan Williams <dan.j.williams@...el.com>,
 Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>, Alexander
 Viro <viro@...iv.linux.org.uk>, Christian Brauner <brauner@...nel.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport
 <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko
 <mhocko@...e.com>, Zi Yan <ziy@...dia.com>, Baolin Wang
 <baolin.wang@...ux.alibaba.com>, Nico Pache <npache@...hat.com>, Ryan
 Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>, Barry Song
 <baohua@...nel.org>, Jann Horn <jannh@...gle.com>, Pedro Falcato
 <pfalcato@...e.de>, Hugh Dickins <hughd@...gle.com>, Oscar Salvador
 <osalvador@...e.de>, Lance Yang <lance.yang@...ux.dev>
Subject: Re: [PATCH v1 0/9] mm: vm_normal_page*() improvements

On Tue, 15 Jul 2025 15:23:41 +0200 David Hildenbrand <david@...hat.com> wrote:

> Based on mm/mm-new. I dropped the CoW PFNMAP changes for now, still
> working on a better way to sort all that out cleanly.
> 
> Cleanup and unify vm_normal_page_*() handling, also marking the
> huge zerofolio as special in the PMD. Add+use vm_normal_page_pud() and
> cleanup that XEN vm_ops->find_special_page thingy.
> 
> There are plans of using vm_normal_page_*() more widely soon.
> 
> Briefly tested on UML (making sure vm_normal_page() still works as expected
> without pte_special() support) and on x86-64 with a bunch of tests.

When I was but a wee little bairn, my mother would always tell me
"never merge briefly tested patches when you're at -rc6".  But three
weeks in -next should shake things out.

However the series rejects due to the is_huge_zero_pmd ->
is_huge_zero_pfn changes in Luiz's "mm: introduce snapshot_page() v3"
series, so could we please have a redo against present mm-new?