linux-kernel - Re: [PATCH v3 04/12] mm: Introduce vma_pgtable_walk

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Message-ID: <20240322122742.GG159172@nvidia.com>
Date: Fri, 22 Mar 2024 09:27:42 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: peterx@...hat.com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	Michael Ellerman <mpe@...erman.id.au>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Matthew Wilcox <willy@...radead.org>,
	Rik van Riel <riel@...riel.com>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	Yang Shi <shy828301@...il.com>, John Hubbard <jhubbard@...dia.com>,
	linux-arm-kernel@...ts.infradead.org,
	"Kirill A . Shutemov" <kirill@...temov.name>,
	Andrew Jones <andrew.jones@...ux.dev>,
	Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Muchun Song <muchun.song@...ux.dev>,
	Christoph Hellwig <hch@...radead.org>,
	linux-riscv@...ts.infradead.org,
	James Houghton <jthoughton@...gle.com>,
	David Hildenbrand <david@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
	Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH v3 04/12] mm: Introduce vma_pgtable_walk_{begin|end}()

On Thu, Mar 21, 2024 at 06:07:54PM -0400, peterx@...hat.com wrote:
> From: Peter Xu <peterx@...hat.com>
> 
> Introduce per-vma begin()/end() helpers for pgtable walks.  This is a
> preparation work to merge hugetlb pgtable walkers with generic mm.
> 
> The helpers need to be called before and after a pgtable walk, will start
> to be needed if the pgtable walker code supports hugetlb pages.  It's a
> hook point for any type of VMA, but for now only hugetlb uses it to
> stablize the pgtable pages from getting away (due to possible pmd
> unsharing).
> 
> Reviewed-by: Christoph Hellwig <hch@...radead.org>
> Reviewed-by: Muchun Song <muchun.song@...ux.dev>
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  include/linux/mm.h |  3 +++
>  mm/memory.c        | 12 ++++++++++++
>  2 files changed, 15 insertions(+)

is_vm_hugetlb_page(vma) seems weirdly named. Regardless

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason