mm: mprotect: always skip dma pinned folio in prot_numa_skip()

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Patch series "mm: some optimizations for prot numa", v5.


This patch (of 4):

If the folio (even not CoW folio) is dma pinned, it can't be migrated due
to the elevated reference count.  So always skip a pinned folio to avoid
wasting cycles when folios are migrated.

Link: https://lkml.kernel.org/r/20251023113737.3572790-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20251023113737.3572790-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Barry Song <baohua@kernel.org>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

This commit is contained in:

Kefeng Wang 2025-10-23 19:37:34 +08:00 • committed by Andrew Morton

parent d945667dcb

commit 03aa8e4f27

1 changed files with 6 additions and 3 deletions

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mm/mprotect.c

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