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Message-Id: <20230912175228.952039-4-shr@devkernel.io>
Date: Tue, 12 Sep 2023 10:52:27 -0700
From: Stefan Roesch <shr@...kernel.io>
To: kernel-team@...com
Cc: shr@...kernel.io, akpm@...ux-foundation.org, david@...hat.com,
hannes@...xchg.org, riel@...riel.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org
Subject: [PATCH v1 3/4] mm/ksm: document smart scan mode
This adds documentation for the smart scan mode of KSM.
Signed-off-by: Stefan Roesch <shr@...kernel.io>
---
Documentation/admin-guide/mm/ksm.rst | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst
index 776f244bdae4..1762219baf51 100644
--- a/Documentation/admin-guide/mm/ksm.rst
+++ b/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
+ By default KSM checks every candidate page for each scan. It does
+ 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 disabled. The ``pages_skipped`` metric shows how
+ effetive the setting is.
+
The effectiveness of KSM and MADV_MERGEABLE is shown in ``/sys/kernel/mm/ksm/``:
general_profit
--
2.39.3
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