[PATCH 9/9] Docs/admin-guide/mm/damon/reclaim: document how to disable watermarks

[SJ Park <sj@kernel.org>]

From: Jinjie Ruan <ruanjinjie@huawei.com>

DAMON_RECLAIM runs its scheme only while the free memory rate is
between `wmarks_low` and `wmarks_mid`.

But some users want to reclaim cold pages even while the system has
plenty of free memory, and it is not obvious that the existing
watermarks parameters can already do that. So Document the setup.

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: SJ Park <sj@kernel.org>
Signed-off-by: SJ Park <sj@kernel.org>
---
Changes from v1
- v1: https://lore.kernel.org/20261028023628.795637-1-ruanjinjie@huawei.com
- Collect R-b: from SJ.
- Rebase to latest mm-new.

 Documentation/admin-guide/mm/damon/reclaim.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/admin-guide/mm/damon/reclaim.rst b/Documentation/admin-guide/mm/damon/reclaim.rst
index ec7e3e32b4ac6..14f9b82b38ed9 100644
--- a/Documentation/admin-guide/mm/damon/reclaim.rst
+++ b/Documentation/admin-guide/mm/damon/reclaim.rst
@@ -193,6 +193,10 @@ DAMON_RECLAIM becomes inactive, so it does nothing but periodically checks the
 watermarks.  In the case, the system falls back to the LRU-list based page
 granularity reclamation logic.
 
+To keep DAMON_RECLAIM always active regardless of the free memory rate, set
+``wmarks_high``, ``wmarks_mid`` and ``wmarks_low`` to ``1000``, ``1000`` and
+``0``, respectively.
+
 sample_interval
 ---------------
 
-- 
2.47.3