Re: [PATCH v1 3/4] mm/ksm: document smart scan mode

[David Hildenbrand]

On 12.09.23 19:52, Stefan Roesch wrote:
> This adds documentation for the smart scan mode of KSM.
>
> Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
> ---
>   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

Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb