diff options
| author | SeongJae Park <sj@kernel.org> | 2025-12-16 00:01:22 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-01-20 19:24:45 -0800 |
| commit | 64aa87f03da9165c45534695da42d9e87ada7544 (patch) | |
| tree | 84e1c9a17846520f04284602acb84b45c713649a | |
| parent | 204ab9ab9310cd79c710037992e6ad681c8fa6b9 (diff) | |
Docs/mm/damon/design: update for max_nr_snapshots
Update DAMON design document for the newly added snapshot level DAMOS
deactivation feature, max_nr_snapshots.
Link: https://lkml.kernel.org/r/20251216080128.42991-10-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | Documentation/mm/damon/design.rst | 5 |
1 files changed, 5 insertions, 0 deletions
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 <sysfs_interface>`, refer to :ref:s`stats <sysfs_stats>` part of the documentation. |