mm: huge_memory: add folio_mark_accessed() when zapping file THP

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When investigating performance issues during file folio unmap, I noticed
some behavioral differences in handling non-PMD-sized folios and PMD-sized
folios.  For non-PMD-sized file folios, it will call folio_mark_accessed()
to mark the folio as having seen activity, but this is not done for
PMD-sized folios.

This might not cause obvious issues, but a potential problem could be
that, it might lead to reclaim of hot file folios under memory pressure,
as quoted from Johannes:

: Sometimes file contents are only accessed through relatively short-lived
: mappings. But they can nevertheless be accessed a lot and be hot. It's
: important to not lose that information on unmap, and end up kicking out a
: frequently used cache page.

Therefore, we should also add folio_mark_accessed() for PMD-sized file
folios when unmapping.

[baolin.wang@linux.alibaba.com: add comment]
  Link: https://lkml.kernel.org/r/23fdc11d-e983-4627-89a8-79e9ecf9a45a@linux.alibaba.com
Link: https://lkml.kernel.org/r/fc117f60d7b686f87067f36a0ef7cdbc3a78109c.1744190345.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Barry Song <21cnbao@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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Baolin Wang 2025-04-09 17:38:58 +08:00 • committed by Andrew Morton

parent 10d288964d

commit 10d483f198

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