linux-kernel - Re: [PATCH 05/13] mm: Introduce vma_pgtable_walk

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Date: Mon, 25 Dec 2023 14:34:48 +0800
From: Muchun Song <muchun.song@...ux.dev>
To: Peter Xu <peterx@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Linux-MM <linux-mm@...ck.org>,
 Matthew Wilcox <willy@...radead.org>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Lorenzo Stoakes <lstoakes@...il.com>,
 David Hildenbrand <david@...hat.com>,
 Vlastimil Babka <vbabka@...e.cz>,
 Mike Kravetz <mike.kravetz@...cle.com>,
 Mike Rapoport <rppt@...nel.org>,
 Christoph Hellwig <hch@...radead.org>,
 John Hubbard <jhubbard@...dia.com>,
 Andrew Jones <andrew.jones@...ux.dev>,
 linux-arm-kernel@...ts.infradead.org,
 Michael Ellerman <mpe@...erman.id.au>,
 "Kirill A . Shutemov" <kirill@...temov.name>,
 linuxppc-dev@...ts.ozlabs.org,
 Rik van Riel <riel@...riel.com>,
 linux-riscv@...ts.infradead.org,
 Yang Shi <shy828301@...il.com>,
 James Houghton <jthoughton@...gle.com>,
 "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Jason Gunthorpe <jgg@...dia.com>,
 Andrea Arcangeli <aarcange@...hat.com>,
 Axel Rasmussen <axelrasmussen@...gle.com>
Subject: Re: [PATCH 05/13] mm: Introduce vma_pgtable_walk_{begin|end}()

> On Dec 19, 2023, at 15:55, 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>
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>

Thanks.