diff options
| author | Asier Gutierrez <gutierrez.asier@huawei-partners.com> | 2026-03-18 06:53:47 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-04-05 23:53:31 +0300 |
| commit | 01494f713ee315e0aa2ddfe2f2760fd83c417e35 (patch) | |
| tree | 53fdc58f873297e72dae593f04815df8e6212454 | |
| parent | cba82993308dc66403c5c3dd27712a58e6fe3aa8 (diff) | |
| download | linux-01494f713ee315e0aa2ddfe2f2760fd83c417e35.tar.xz | |
Docs/mm/damon/design: document DAMON actions when TRANSPARENT_HUGEPAGE is off
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>
| -rw-r--r-- | Documentation/mm/damon/design.rst | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index dc37402c0fee..838b14d22519 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -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. |