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Howlett" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 4/8] Docs/admin-guide/mm/damon/usage: document empty target regions commit behavior Date: Sun, 26 Oct 2025 11:22:09 -0700 Message-ID: <20251026182216.118200-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251026182216.118200-1-sj@kernel.org> References: <20251026182216.118200-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Stat-Signature: gwj7fpehmtosemprxn7836zgjnxankh5 X-Rspam-User: X-Rspamd-Queue-Id: 75665100003 X-HE-Tag: 1761502945-567428 X-HE-Meta: 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 Um0nWo9A IT3lrg6kmDHOZ7W3WUr1+k0SDdR8LBn423Mi915I0a9c7VS58xgabT1UQQdfrv3m3ZKjPRPoeqsKfmzt/7Dai5mGiiBf+9eiIJtZIzfOiL07sfDRYSy3y+mWtMSU5ssrye9E/8UDwWLUBExtAZCrwYmYQlj/mv0k2rmInrrX5otjHuRxRJ5V0Tr4TCoXhKzJnjNDNUgttWO6JZDmJ1MSbAYZYtkQRp+LXp5CHawl6Og6crQY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Committing a monitoring target with empty target regions is for keeping the current monitoring results. This behavior was introduced by commit 973233600676 ("mm/damon/sysfs: update monitoring target regions for online input commit"). The behavior is not documented, though. Update the usage document for clarifying this behavior. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index d8a3d6e740b3..9991dad60fcf 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -134,7 +134,8 @@ Users can write below commands for the kdamond to the ``state`` file. - ``on``: Start running. - ``off``: Stop running. - ``commit``: Read the user inputs in the sysfs files except ``state`` file - again. + again. Monitoring :ref:`target region ` inputs are also be + ignored if no target region is specified. - ``update_tuned_intervals``: Update the contents of ``sample_us`` and ``aggr_us`` files of the kdamond with the auto-tuning applied ``sampling interval`` and ``aggregation interval`` for the files. Please refer to @@ -296,6 +297,11 @@ In the beginning, this directory has only one file, ``nr_regions``. Writing a number (``N``) to the file creates the number of child directories named ``0`` to ``N-1``. Each directory represents each initial monitoring target region. +If ``nr_regions`` is zero when committing new DAMON parameters online (writing +``commit`` to ``state`` file of :ref:`kdamond `), the commit +logic ignores the target regions. In other words, the current monitoring +results for the target are preserved. + .. _sysfs_region: regions// -- 2.47.3