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mm/khugepaged: preserve dirty bits when collapsing PTE-mapped THPs

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try_collapse_pte_mapped_thp() clears PTEs without transferring their dirty
bits to the folio. A shmem read fault can map a clean folio writable, so
a later store only dirties the PTE. Losing that dirty bit allows reclaim
to discard modified data.

The assumption that regular files are read-only is also obsolete since
commit 1b6444331b ("mm/khugepaged: enable clean pagecache folio collapse
for writable files"). In any case, transferring PTE dirty bits to the folio
when removing mappings (and while the folio is still mapped) is the right
thing to do.

Use get_and_clear_ptes() to collect the dirty bits and mark the folio
dirty before unmapping it. Update the comment.

This was reproduced with shmem using MADV_COLLAPSE followed by
MADV_PAGEOUT.

Fix generated by an LLM and sent by Chris Mason in private.

Fixes: 27e1f82731 ("khugepaged: enable collapse pmd for pte-mapped THP")
Fixes: 1b6444331b ("mm/khugepaged: enable clean pagecache folio collapse for writable files")
Cc: stable@vger.kernel.org
Signed-off-by: Chris Mason <mason@kernel.org>
[ david: adjust comment; simplify description; cover file-thp as well ]
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Gregory Price (Meta) <gourry@gourry.net>
Tested-by: Gregory Price (Meta) <gourry@gourry.net>
Tested-by: Muhammad Usama Anjum <usama.anjum@arm.com>
Link: https://patch.msgid.link/20261031-fixes_core-v3-17-d6437171ecc3@kernel.org
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
This commit is contained in:
Chris Mason 2026-10-31 10:39:46 +01:00 committed by David Hildenbrand (Arm)
parent db38b90230
commit fe2817e3d5
1 changed files with 3 additions and 2 deletions
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5
mm/khugepaged.c
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@ -1995,9 +1995,10 @@ static enum scan_result try_collapse_pte_mapped_thp(struct mm_struct *mm, unsign
/*
* Must clear entry, or a racing truncate may re-remove it.
* TLB flush can be left until pmdp_collapse_flush() does it.
* PTE dirty? Shmem page is already dirty; file is read-only.
*/
clear_ptes(mm, addr, pte, nr_batch_ptes);
ptent = get_and_clear_ptes(mm, addr, pte, nr_batch_ptes);
if (pte_dirty(ptent))
folio_mark_dirty(folio);
folio_remove_rmap_ptes(folio, page, nr_batch_ptes, vma);
nr_mapped_ptes += nr_batch_ptes;
}