From: "David Hildenbrand (Arm)" <david@kernel.org>
To: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Liam R. Howlett" <liam@infradead.org>,
"Vlastimil Babka" <vbabka@kernel.org>,
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Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org,
kvm@vger.kernel.org, linux-s390@vger.kernel.org,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
intel-xe@lists.freedesktop.org, linux-perf-users@vger.kernel.org,
linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCH v4 10/20] mm/rmap: track whether the page VMA mapped pgoff is anonymous
Date: Tue, 11 Aug 2026 18:46:58 +0200 [thread overview]
Message-ID: <3cff4b8f-b523-4805-add9-e817e9bb6a82@kernel.org> (raw)
In-Reply-To: <20260806-b4-scalable-cow-virt-pgoff-v4-10-ab318a350404@kernel.org>
On 8/6/26 22:21, Lorenzo Stoakes (ARM) wrote:
> Update the page_vma_mapped_walk structure to track whether the pgoff being
> tracked is an anonymous pgoff or not and update the comments to reflect
> this.
>
> This is necessary in order to determine the correct VMA page
> offset in vma_address_end() when pvmw->nr_pages > 1.
>
> Also document that pvmw->pgoff is meaningless for pvmw->nr_pages == 1 and
> for KSM.
>
> Do not set this field where pgoff is not specified.
>
> This is laying the groundwork for eventually using anonymous page offsets
> as the index for all anonymous folios.
>
> No functional change intended.
>
> Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-08-11 16:47 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-06 20:21 [PATCH v4 00/20] mm/rmap: index MAP_PRIVATE file-backed folios by anonymous pgoff Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 01/20] mm/vma: introduce VMA anon page offset field and add helpers Lorenzo Stoakes (ARM)
2026-08-09 0:51 ` Suren Baghdasaryan
2026-08-10 8:36 ` Lorenzo Stoakes (ARM)
2026-08-10 16:24 ` Suren Baghdasaryan
2026-08-06 20:21 ` [PATCH v4 02/20] mm: provide vma_[flags_]is_cow_mapping() and remove is_cow_mapping() Lorenzo Stoakes (ARM)
2026-08-10 17:59 ` Lorenzo Stoakes (ARM)
2026-08-10 22:10 ` Andrew Morton
2026-08-11 8:40 ` Lorenzo Stoakes (ARM)
2026-08-11 16:14 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 03/20] mm: introduce linear_anon_page_index() Lorenzo Stoakes (ARM)
2026-08-09 0:49 ` Suren Baghdasaryan
2026-08-10 8:39 ` Lorenzo Stoakes (ARM)
2026-08-10 16:25 ` Suren Baghdasaryan
2026-08-11 16:19 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 04/20] mm: abstract vma_address() and introduce vma_anon_address() Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 05/20] mm: update print_bad_page_map() to show anon index if appropriate Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 06/20] mm: introduce and use vma_filebacked_address() Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 07/20] mm/vma: fix self-merge check in copy_vma() Lorenzo Stoakes (ARM)
2026-08-11 16:44 ` David Hildenbrand (Arm)
2026-08-11 16:51 ` Lorenzo Stoakes (ARM)
2026-08-11 16:53 ` David Hildenbrand (Arm)
2026-08-11 17:06 ` Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 08/20] tools/testing/vma: add tests for copy_vma() self-merge Lorenzo Stoakes (ARM)
2026-08-11 16:46 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 09/20] mm: propagate VMA anonymous page offset on map, remap, split + merge Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 10/20] mm/rmap: track whether the page VMA mapped pgoff is anonymous Lorenzo Stoakes (ARM)
2026-08-11 16:46 ` David Hildenbrand (Arm) [this message]
2026-08-06 20:21 ` [PATCH v4 11/20] mm: clean up vma_address_end() Lorenzo Stoakes (ARM)
2026-08-11 16:48 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 12/20] mm/huge_memory: update remove_migration_pmd() to accept a folio Lorenzo Stoakes (ARM)
2026-08-11 16:49 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 13/20] mm/migrate: calculate large folio page index using PFN Lorenzo Stoakes (ARM)
2026-08-11 16:49 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 14/20] mm/rmap: use anon pgoff to track MAP_PRIVATE file-backed anon folios Lorenzo Stoakes (ARM)
2026-08-11 16:52 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 15/20] tools/testing/vma: expand VMA merge tests to assert anon pgoff Lorenzo Stoakes (ARM)
2026-08-11 16:53 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 16/20] tools/testing/selftests/mm: test anonymous page offset merge behaviour Lorenzo Stoakes (ARM)
2026-08-11 16:56 ` David Hildenbrand (Arm)
2026-08-11 17:07 ` Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 17/20] mm/vma: only permit MAP_PRIVATE /dev/zero to be mapped anonymous Lorenzo Stoakes (ARM)
2026-08-11 17:07 ` David Hildenbrand (Arm)
2026-08-06 20:21 ` [PATCH v4 18/20] mm/vma: make MAP_PRIVATE-mapped /dev/zero mappings truly anonymous Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 19/20] tools/testing/vma: add test to assert MAP_PRIVATE-/dev/zero is anon Lorenzo Stoakes (ARM)
2026-08-06 20:21 ` [PATCH v4 20/20] tools/testing/selftests/mm: add MAP_PRIVATE-/dev/zero merge tests Lorenzo Stoakes (ARM)
2026-08-06 23:27 ` [PATCH v4 00/20] mm/rmap: index MAP_PRIVATE file-backed folios by anonymous pgoff Andrew Morton
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