linux-kernel - Re: [PATCH] mm/huge_memory.c: introduce folio_split

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Message-ID: <4daec24f-c97e-4c26-819b-e7762b301036@nvidia.com>
Date: Fri, 14 Nov 2025 20:10:48 +1100
From: Balbir Singh <balbirs@...dia.com>
To: "David Hildenbrand (Red Hat)" <david@...nel.org>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 dri-devel@...ts.freedesktop.org
Cc: Andrew Morton <akpm@...ux-foundation.org>, Zi Yan <ziy@...dia.com>,
 Joshua Hahn <joshua.hahnjy@...il.com>, Rakie Kim <rakie.kim@...com>,
 Byungchul Park <byungchul@...com>, Gregory Price <gourry@...rry.net>,
 Ying Huang <ying.huang@...ux.alibaba.com>,
 Alistair Popple <apopple@...dia.com>, Oscar Salvador <osalvador@...e.de>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Barry Song <baohua@...nel.org>, Lyude Paul <lyude@...hat.com>,
 Danilo Krummrich <dakr@...nel.org>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Ralph Campbell <rcampbell@...dia.com>,
 Mika Penttilä <mpenttil@...hat.com>,
 Matthew Brost <matthew.brost@...el.com>,
 Francois Dugast <francois.dugast@...el.com>
Subject: Re: [PATCH] mm/huge_memory.c: introduce folio_split_unmapped

On 11/14/25 19:36, David Hildenbrand (Red Hat) wrote:
> On 14.11.25 02:22, Balbir Singh wrote:
>> Unmapped was added as a parameter to __folio_split() and related
>> call sites to support splitting of folios already in the midst
>> of a migration. This special case arose for device private folio
>> migration since during migration there could be a disconnect between
>> source and destination on the folio size.
> 
> Didn't I already comment that the subject should start with "mm/huge_memory: introduce ..." ?
> 

Yeah.. the .c in the prefix is not desirable, I missed that in the subject line

> Yes I did: https://lore.kernel.org/all/048134fd-6a3d-4a6c-a2eb-9a9911c3b35f@kernel.org/
> 
> You know, I'm a busy man, can you *please*
> 
> * take better care of addressing all previous comments?
> * wait more than 12 h after asking a question before you resend?
> 

I think addressed most of it, I missed the subject line, but in general addressed

1. Using folio_split_ as the prefix to split functions, the main function is called folio_split_unmapped and the helper name was suggested by Zi to be __folio_freeze_and_split_unmapped() and it sounded better than what I had __folio_split_unmapped() or even __folio_split_freeze_unmapped()
2. Got rid of _to_order() as the function suffix

Do you have any more outstanding comments that I missed?

Thanks for the review!
Balbir