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Mon, 16 Mar 2026 17:09:40 +0300 From: To: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v1 1/1] Docs/mm/damon: Document DAMON actions when TRANSPARENT_HUGEPAGE is off Date: Mon, 16 Mar 2026 14:08:21 +0000 Message-ID: <20260316140822.2033181-1-gutierrez.asier@huawei-partners.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.123.65.218] X-ClientProxiedBy: mscpeml500003.china.huawei.com (7.188.49.51) To mscpeml500003.china.huawei.com (7.188.49.51) X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5B4521C000E X-Stat-Signature: kjk6e6fhze6q4pw1u5qbwngjkjjeptgr X-Rspam-User: X-HE-Tag: 1773670188-327396 X-HE-Meta: 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 jrlsbR8d gWU3Gm6sh8UT+ru+lBpXjS/QIrXDhHZlPK3a77zRhWfUSTgBJqxZTS4VyCbUeRcv5XIXR/GcH/Oe/Wwhx+W454IAQ8/y5llkogVGOOlfTuUyxYBloPQQq53AFltXCgh/tBUHv97TJhj5MEtZ7PZ+cNWqSUtdWJI6P6+azjh8BlCfd9e7OYtPRhtSUZXe2Y8KvPZ2fy6+iSUf2DBuV6QswBu918zULzRc48mDWoba/CoiTgKsesCCDiLNWK0Veyv04o+Z9WOu+lY6cvwElZawTVG35H8ijPbAEAIIYuRo3v5n+PJM= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Asier Gutierrez 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. [1]: https://lore.kernel.org/damon/66131775-180b-4b9f-b7ce-61a3e077b6e6@huawei-partners.com/T/#m278d3c9bbedcceaf2efa51e3dc7b40a40654e51c Signed-off-by: Asier Gutierrez --- Documentation/mm/damon/design.rst | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 29fff20b3c2a..478eab4a186a 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. -- 2.43.0