mm/memory-failure: improve large block size folio handling

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Large block size (LBS) folios cannot be split to order-0 folios but
min_order_for_folio().  Current split fails directly, but that is not
optimal.  Split the folio to min_order_for_folio(), so that, after split,
only the folio containing the poisoned page becomes unusable instead.

For soft offline, do not split the large folio if its
min_order_for_folio() is not 0.  Since the folio is still accessible from
userspace and premature split might lead to potential performance loss.

Link: https://lkml.kernel.org/r/20251031162001.670503-3-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Suggested-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Pankaj Raghav <kernel@pankajraghav.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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Zi Yan 2025-10-31 12:20:00 -04:00 • committed by Andrew Morton

parent a7ef12c64f

commit 689b898677

1 changed files with 27 additions and 4 deletions

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mm/memory-failure.c

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