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Howlett" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 06/11] Docs/admin-guide/mm/damon/usage: document goal_tuner sysfs file Date: Mon, 9 Mar 2026 18:05:22 -0700 Message-ID: <20260310010529.91162-7-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260310010529.91162-1-sj@kernel.org> References: <20260310010529.91162-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: t8kqyfhj9gscbqecfnotodaocpjr5ucz X-Rspamd-Server: rspam09 X-Rspam-User: X-Rspamd-Queue-Id: 5D57C4000F X-HE-Tag: 1773104741-226504 X-HE-Meta: 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 qqDflTnJ AKZJ/P0xC/b2HhLL6ddOJaXxZT3aYUHR91Y69ZBe4wx/c8WQq/JvmU7LymOIxvvoMJZY7ijCOEg+FJ1YBzCRtngIfW7p5cNEQgIzROYUBkgM/jTYJVk3g4XdB3RQF4ji3RyajXdPD4JW2aXZtYdHtNofELZSxnh9ArCveuM5DnBJXCjDdXz3Em7kWOYCWIWT2Ti5FQ/UFipqxnBUk/PZUwrzOU8yCg3azrGqZnkSc/C4noqOE4e8s0YhjSijkAr+1PNudWnjouG3+Uf1bujIMpUwzcJU9INNgMEQcelUzFReCPB+ij1mr+VI5rQYcZYwpa3Qx1NtJvHcH2N643JX2SLzoli2syGoTOqVphHcwMNFzU9sgRLglnjFCOg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Update the DAMON usage document for the new sysfs file for the goal based quota auto-tuning algorithm selection. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index b0f3969b6b3b1..534e1199cf091 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -83,7 +83,7 @@ comma (","). │ │ │ │ │ │ │ │ sz/min,max │ │ │ │ │ │ │ │ nr_accesses/min,max │ │ │ │ │ │ │ │ age/min,max - │ │ │ │ │ │ │ :ref:`quotas `/ms,bytes,reset_interval_ms,effective_bytes + │ │ │ │ │ │ │ :ref:`quotas `/ms,bytes,reset_interval_ms,effective_bytes,goal_tuner │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil │ │ │ │ │ │ │ │ :ref:`goals `/nr_goals │ │ │ │ │ │ │ │ │ 0/target_metric,target_value,current_value,nid,path @@ -377,9 +377,9 @@ schemes//quotas/ The directory for the :ref:`quotas ` of the given DAMON-based operation scheme. -Under ``quotas`` directory, four files (``ms``, ``bytes``, -``reset_interval_ms``, ``effective_bytes``) and two directories (``weights`` and -``goals``) exist. +Under ``quotas`` directory, five files (``ms``, ``bytes``, +``reset_interval_ms``, ``effective_bytes`` and ``goal_tuner``) and two +directories (``weights`` and ``goals``) exist. You can set the ``time quota`` in milliseconds, ``size quota`` in bytes, and ``reset interval`` in milliseconds by writing the values to the three files, @@ -390,6 +390,14 @@ apply the action to only up to ``bytes`` bytes of memory regions within the quota limits unless at least one :ref:`goal ` is set. +You can set the goal-based effective quota auto-tuning algorithm to use, by +writing the algorithm name to ``goal_tuner`` file. Reading the file returns +the currently selected tuner algorithm. Refer to the design documentation of +:ref:`automatic quota tuning goals ` for +the background design of the feature and the name of the selectable algorithms. +Refer to :ref:`goals directory ` for the goals +setup. + The time quota is internally transformed to a size quota. Between the transformed size quota and user-specified size quota, smaller one is applied. Based on the user-specified :ref:`goal `, the -- 2.47.3