From: Shakeel Butt <shakeel.butt@linux.dev>
To: Kiryl Shutsemau <kirill@shutemov.name>
Cc: Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>,
Hugh Dickins <hughd@google.com>,
Matthew Wilcox <willy@infradead.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>, Rik van Riel <riel@surriel.com>,
Harry Yoo <harry.yoo@oracle.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Kiryl Shutsemau <kas@kernel.org>
Subject: Re: [PATCHv2 2/5] mm/rmap: Fix a mlock race condition in folio_referenced_one()
Date: Fri, 19 Sep 2025 14:18:56 -0700 [thread overview]
Message-ID: <vc7lycvsvehisjr5drbng2lupytme3grubxbtgavvvjknkgzd6@axgctxng4424> (raw)
In-Reply-To: <20250919124036.455709-3-kirill@shutemov.name>
On Fri, Sep 19, 2025 at 01:40:33PM +0100, Kiryl Shutsemau wrote:
> From: Kiryl Shutsemau <kas@kernel.org>
>
> The mlock_vma_folio() function requires the page table lock to be held
> in order to safely mlock the folio. However, folio_referenced_one()
> mlocks a large folios outside of the page_vma_mapped_walk() loop where
> the page table lock has already been dropped.
>
> Rework the mlock logic to use the same code path inside the loop for
> both large and small folios.
>
> Use PVMW_PGTABLE_CROSSED to detect when the folio is mapped across a
> page table boundary.
>
> Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Nice, this simplifies the code.
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
next prev parent reply other threads:[~2025-09-19 21:19 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-19 12:40 [PATCHv2 0/5] mm: Improve mlock tracking for large folios Kiryl Shutsemau
2025-09-19 12:40 ` [PATCHv2 1/5] mm/page_vma_mapped: Track if the page is mapped across page table boundary Kiryl Shutsemau
2025-09-19 20:25 ` Shakeel Butt
2025-09-22 16:13 ` Kiryl Shutsemau
2025-09-19 12:40 ` [PATCHv2 2/5] mm/rmap: Fix a mlock race condition in folio_referenced_one() Kiryl Shutsemau
2025-09-19 21:18 ` Shakeel Butt [this message]
2025-09-19 12:40 ` [PATCHv2 3/5] mm/rmap: mlock large folios in try_to_unmap_one() Kiryl Shutsemau
2025-09-19 21:27 ` Shakeel Butt
2025-09-22 9:51 ` Kiryl Shutsemau
2025-09-22 20:16 ` Shakeel Butt
2025-09-19 12:40 ` [PATCHv2 4/5] mm/fault: Try to map the entire file folio in finish_fault() Kiryl Shutsemau
2025-09-19 21:28 ` Shakeel Butt
2025-09-20 7:37 ` Matthew Wilcox
2025-09-22 16:16 ` Kiryl Shutsemau
2025-09-22 3:19 ` Baolin Wang
2025-09-19 12:40 ` [PATCHv2 5/5] mm/rmap: Improve mlock tracking for large folios Kiryl Shutsemau
2025-09-22 3:20 ` Baolin Wang
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