[merged mm-stable] mm-ksm-document-smart-scan-mode.patch removed from -mm tree

[merged mm-stable] mm-ksm-document-smart-scan-mode.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/ksm: document smart scan mode
has been removed from the -mm tree.  Its filename was
     mm-ksm-document-smart-scan-mode.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Stefan Roesch <shr@devkernel.io>
Subject: mm/ksm: document smart scan mode
Date: Mon, 25 Sep 2023 21:09:38 -0700

This adds documentation for the smart scan mode of KSM.

[akpm@linux-foundation.org: fix typo]
[akpm@linux-foundation.org: document that smart_scan defaults to on]
Link: https://lkml.kernel.org/r/20230926040939.516161-4-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/admin-guide/mm/ksm.rst |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/Documentation/admin-guide/mm/ksm.rst~mm-ksm-document-smart-scan-mode
+++ a/Documentation/admin-guide/mm/ksm.rst
@@ -155,6 +155,15 @@ stable_node_chains_prune_millisecs
         scan. It's a noop if not a single KSM page hit the
         ``max_page_sharing`` yet.
 
+smart_scan
+        Historically KSM checked every candidate page for each scan. It did
+        not take into account historic information.  When smart scan is
+        enabled, pages that have previously not been de-duplicated get
+        skipped. How often these pages are skipped depends on how often
+        de-duplication has already been tried and failed. By default this
+        optimization is enabled.  The ``pages_skipped`` metric shows how
+        effective the setting is.
+
 The effectiveness of KSM and MADV_MERGEABLE is shown in ``/sys/kernel/mm/ksm/``:
 
 general_profit
_

Patches currently in -mm which might be from shr@devkernel.io are