Update DAMON design document for the newly added snapshot level DAMOS deactivation feature, max_nr_snapshots. Signed-off-by: SeongJae Park --- Documentation/mm/damon/design.rst | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 5cc7b7d662be..7fd819b8bbf7 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -720,6 +720,7 @@ scheme's execution. - ``qt_exceeds``: Total number of times the quota of the scheme has exceeded. - ``nr_snapshots``: Total number of DAMON snapshots that the scheme is tried to be applied. +- ``max_nr_snapshots``: Upper limit of ``nr_snapshots``. "A scheme is tried to be applied to a region" means DAMOS core logic determined the region is eligible to apply the scheme's :ref:`action @@ -741,6 +742,10 @@ to exclude anonymous pages and the region has only anonymous pages, or if the action is ``pageout`` while all pages of the region are unreclaimable, applying the action to the region will fail. +Unlike normal stats, ``max_nr_snapshots`` is set by users. If it is set as +non-zero and ``nr_snapshots`` be same to or greater than ``nr_snapshots``, the +scheme is deactivated. + To know how user-space can read the stats via :ref:`DAMON sysfs interface `, refer to :ref:s`stats ` part of the documentation. -- 2.47.3