Re: [PATCH v2] mm/shmem: remove truncated folios from the page cache in batches

[David Hildenbrand]

On Thu, 05 Nov 2026 07:32:11 -0500, Qiliang Yuan wrote:
> truncate_inode_pages_range() takes the folios it finds out of the page
> cache with delete_from_page_cache_batch(), which takes the inode's
> i_lock and the i_pages lock once for each batch of up to
> FOLIO_BATCH_SIZE folios.
> 
> shmem_undo_range() calls truncate_inode_folio() on each folio instead,
> so filemap_remove_folio() takes and drops both locks once per folio.
> Truncating, punching or freeing a tmpfs file or memfd made of small
> folios, such as a large /dev/shm segment, pays for that on every page.
> 
> [...]

Applied, thanks!

tree: mm/core.git
branch: shmem-7.5.misc

Applied patches will appear soon in mm-next, followed by linux-next.

Please report any outstanding bugs that were missed during review, so we
can either drop the patch series or decide how to fix it up.

It is encouraged to provide Acked-bys, Reviewed-bys, and Tested-bys even
though the patches have already been applied. If possible, patch trailers
will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. Further, this is not a guarantee that the
patches will go upstream. If in doubt, please check the listed branch.

[1/1] mm/shmem: remove truncated folios from the page cache in batches
      https://git.kernel.org/mm/core/c/b97fbd54

-- 
Cheers,

David