| Message ID | 20230912175228.952039-4-shr@devkernel.io (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Smart scanning mode for KSM | expand |
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>
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
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(+)