linux-kernel - Re: [PATCH 2/2] mm/rmap: Improve mlock tracking for large folios

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Message-ID: <ea9a78a2-6044-4720-8dc1-33d9e255cb2b@redhat.com>
Date: Thu, 18 Sep 2025 13:31:09 +0200
From: David Hildenbrand <david@...hat.com>
To: kirill@...temov.name, Andrew Morton <akpm@...ux-foundation.org>,
 Hugh Dickins <hughd@...gle.com>, Matthew Wilcox <willy@...radead.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
 Rik van Riel <riel@...riel.com>, Harry Yoo <harry.yoo@...cle.com>,
 Johannes Weiner <hannes@...xchg.org>, Shakeel Butt <shakeel.butt@...ux.dev>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 Kiryl Shutsemau <kas@...nel.org>
Subject: Re: [PATCH 2/2] mm/rmap: Improve mlock tracking for large folios

On 18.09.25 13:21, kirill@...temov.name wrote:
> From: Kiryl Shutsemau <kas@...nel.org>
> 
> The kernel currently does not mlock large folios when adding them to
> rmap, stating that it is difficult to confirm that the folio is fully
> mapped and safe to mlock it. However, nowadays the caller passes a
> number of pages of the folio that are getting mapped, making it easy to
> check if the entire folio is mapped to the VMA.
> 
> mlock the folio on rmap if it is fully mapped to the VMA.
> 
> Signed-off-by: Kiryl Shutsemau <kas@...nel.org>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers

David / dhildenb