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Docs/mm/damon/design: document DAMON actions when TRANSPARENT_HUGEPAGE is off

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MADV_HUGEPAGE and MADV_NOHUGEPAGE are guarded and they are not available
when compiling the kernel without TRANSPARENT_HUGEPAGE option.  The DAMON
behaviour is to silently fail [1] in when DAMOS_HUGEPAGE or
DAMOS_NOHUGEPAGE are used, but TRANSPARENT_HUGEPAGE is disabled.  Update
the DAMON documentation to reflect this behaviour.

Link: https://lkml.kernel.org/r/20260318035349.88715-1-sj@kernel.org
Link: https://lore.kernel.org/66131775-180b-4b9f-b7ce-61a3e077b6e6@huawei-partners.com/ [1]
Signed-off-by: Asier Gutierrez <gutierrez.asier@huawei-partners.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Asier Gutierrez
2026-03-17 20:53:47 -07:00
committed by Andrew Morton
parent cba8299330
commit 01494f713e
1 changed files with 6 additions and 2 deletions
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8
Documentation/mm/damon/design.rst
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@@ -460,9 +460,13 @@ that supports each action are as below.
- ``pageout``: Reclaim the region.
Supported by ``vaddr``, ``fvaddr`` and ``paddr`` operations set.
- ``hugepage``: Call ``madvise()`` for the region with ``MADV_HUGEPAGE``.
Supported by ``vaddr`` and ``fvaddr`` operations set.
Supported by ``vaddr`` and ``fvaddr`` operations set. When
TRANSPARENT_HUGEPAGE is disabled, the application of the action will just
fail.
- ``nohugepage``: Call ``madvise()`` for the region with ``MADV_NOHUGEPAGE``.
Supported by ``vaddr`` and ``fvaddr`` operations set.
Supported by ``vaddr`` and ``fvaddr`` operations set. When
TRANSPARENT_HUGEPAGE is disabled, the application of the action will just
fail.
- ``lru_prio``: Prioritize the region on its LRU lists.
Supported by ``paddr`` operations set.
- ``lru_deprio``: Deprioritize the region on its LRU lists.