linux-kernel - Re: [PATCHv5 10/17] mm/hugetlb: Refactor code around vmemmap

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Message-Id: <1E5F65B7-59C0-463D-95EA-808520C14B85@linux.dev>
Date: Thu, 29 Jan 2026 10:51:48 +0800
From: Muchun Song <muchun.song@...ux.dev>
To: Kiryl Shutsemau <kas@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>,
 Matthew Wilcox <willy@...radead.org>,
 Usama Arif <usamaarif642@...il.com>,
 Frank van der Linden <fvdl@...gle.com>,
 Oscar Salvador <osalvador@...e.de>,
 Mike Rapoport <rppt@...nel.org>,
 Vlastimil Babka <vbabka@...e.cz>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Zi Yan <ziy@...dia.com>,
 Baoquan He <bhe@...hat.com>,
 Michal Hocko <mhocko@...e.com>,
 Johannes Weiner <hannes@...xchg.org>,
 Jonathan Corbet <corbet@....net>,
 Huacai Chen <chenhuacai@...nel.org>,
 WANG Xuerui <kernel@...0n.name>,
 Palmer Dabbelt <palmer@...belt.com>,
 Paul Walmsley <paul.walmsley@...ive.com>,
 Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>,
 kernel-team@...a.com,
 linux-mm@...ck.org,
 linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org,
 loongarch@...ts.linux.dev,
 linux-riscv@...ts.infradead.org
Subject: Re: [PATCHv5 10/17] mm/hugetlb: Refactor code around vmemmap_walk



> On Jan 28, 2026, at 21:54, Kiryl Shutsemau <kas@...nel.org> wrote:
> 
> To prepare for removing fake head pages, the vmemmap_walk code is being
> reworked.
> 
> The reuse_page and reuse_addr variables are being eliminated. There will
> no longer be an expectation regarding the reuse address in relation to
> the operated range. Instead, the caller will provide head and tail
> vmemmap pages.
> 
> Currently, vmemmap_head and vmemmap_tail are set to the same page, but
> this will change in the future.
> 
> The only functional change is that __hugetlb_vmemmap_optimize_folio()
> will abandon optimization if memory allocation fails.
> 
> Signed-off-by: Kiryl Shutsemau <kas@...nel.org>

Reviewed-by: Muchun Song <muchun.song@...ux.dev>

Thanks.