This documents the ksm_process_profit and ksm_merge_type settings in
ksm_stat.
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
---
Documentation/admin-guide/mm/ksm.rst | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst
index 72189bf1283e..70896f01d641 100644
--- a/Documentation/admin-guide/mm/ksm.rst
+++ b/Documentation/admin-guide/mm/ksm.rst
@@ -211,7 +211,8 @@ several times, which are unprofitable memory consumed.
ksm_rmap_items * sizeof(rmap_item).
where ksm_merging_pages is shown under the directory ``/proc/<pid>/``,
- and ksm_rmap_items is shown in ``/proc/<pid>/ksm_stat``.
+ and ksm_rmap_items is shown in ``/proc/<pid>/ksm_stat``. The process profit
+ is also shown in ``/proc/<pid>/ksm_stat`` as ksm_process_profit.
From the perspective of application, a high ratio of ``ksm_rmap_items`` to
``ksm_merging_pages`` means a bad madvise-applied policy, so developers or
@@ -222,6 +223,9 @@ so if the ``ksm_rmap_items/ksm_merging_pages`` ratio exceeds 64 on 64-bit CPU
or exceeds 128 on 32-bit CPU, then the app's madvise policy should be dropped,
because the ksm profit is approximately zero or negative.
+The ksm_merge_type in ``/proc/<pid>/ksm_stat`` shows the merge type of the
+process. Valid values are ``none``, ``madvise`` and ``process``.
+
Monitoring KSM events
=====================
--
2.30.2
