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mm/ksm: document smart scan mode

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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>
This commit is contained in:
Stefan Roesch 2023-09-25 21:09:38 -07:00 committed by Andrew Morton
parent e5a6899126
commit 75d7dd4138
1 changed files with 9 additions and 0 deletions
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9
Documentation/admin-guide/mm/ksm.rst
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@ -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