Messages in this thread | | | Date | Mon, 18 Sep 2023 13:28:38 +0200 | Subject | Re: [PATCH v1 3/4] mm/ksm: document smart scan mode | From | David Hildenbrand <> |
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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@devkernel.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
Reviewed-by: David Hildenbrand <david@redhat.com>
-- Cheers,
David / dhildenb
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