mm: shmem: allow fallback to smaller large orders for tmpfs mmap() access

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After commit 69e0a3b490 ("mm: shmem: fix the strategy for the tmpfs
'huge=' options"), we have fixed the large order allocation strategy for
tmpfs, which always tries PMD-sized large folios first, and if that fails,
falls back to smaller large folios.  For tmpfs large folio allocation via
mmap(), we should maintain the same strategy as well.  Let's unify the
large order allocation strategy for tmpfs.

There is no functional change for large folio allocation of anonymous shmem.

Link: https://lkml.kernel.org/r/283a0bdfd6ac7aa334a491422bcae70919c572bd.1763008453.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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Baolin Wang 2025-11-14 08:46:32 +08:00 • committed by Andrew Morton

parent 1b1a4e4d67

commit 8826f09616

1 changed files with 3 additions and 14 deletions

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mm/shmem.c

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