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Subject: Re: [PATCH 05/13] mm: Introduce vma_pgtable_walk_{begin|end}()
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From: Muchun Song <muchun.song@linux.dev>
In-Reply-To: <20231219075538.414708-6-peterx@redhat.com>
Date: Mon, 25 Dec 2023 14:34:48 +0800
Cc: LKML <linux-kernel@vger.kernel.org>,
 Linux-MM <linux-mm@kvack.org>,
 Matthew Wilcox <willy@infradead.org>,
 Christophe Leroy <christophe.leroy@csgroup.eu>,
 Lorenzo Stoakes <lstoakes@gmail.com>,
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References: <20231219075538.414708-1-peterx@redhat.com>
 <20231219075538.414708-6-peterx@redhat.com>
To: Peter Xu <peterx@redhat.com>
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> On Dec 19, 2023, at 15:55, peterx@redhat.com wrote:
> 
> From: Peter Xu <peterx@redhat.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@infradead.org>
> Signed-off-by: Peter Xu <peterx@redhat.com>

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

Thanks.