Docs/admin-guide/mm/damon/lru_sort: document active_mem_bp parameter

Document a newly added DAMON_LRU_SORT parameter for doing auto-tuning
aiming an active to inactive memory size ratio.

Link: https://lkml.kernel.org/r/20260113152717.70459-10-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Acked-by: wang lian <lianux.mm@gmail.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/Documentation/admin-guide/mm/damon/lru_sort.rst b/Documentation/admin-guide/mm/damon/lru_sort.rst
index bb222a32aefd43d230582f881765f781e94b2e14..6af3ab5579a3feb95672231622f43d22ce008c13 100644 (file)
--- a/Documentation/admin-guide/mm/damon/lru_sort.rst
+++ b/Documentation/admin-guide/mm/damon/lru_sort.rst
@@ -79,6 +79,18 @@ of parametrs except ``enabled`` again.  Once the re-reading is done, this
 parameter is set as ``N``.  If invalid parameters are found while the
 re-reading, DAMON_LRU_SORT will be disabled.
 
+active_mem_bp
+-------------
+
+Desired active to [in]active memory ratio in bp (1/10,000).
+
+While keeping the caps that set by other quotas, DAMON_LRU_SORT automatically
+increases and decreases the effective level of the quota aiming the LRU
+[de]prioritizations of the hot and cold memory resulting in this active to
+[in]active memory ratio.  Value zero means disabling this auto-tuning feature.
+
+Disabled by default.
+
 filter_young_pages
 ------------------