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Howlett" , Andrew Morton , 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: [RFC PATCH 4/9] Docs/admin-guide/mm/damon/usage: document fail_charge_{num,denom} files Date: Sat, 4 Apr 2026 09:39:34 -0700 Message-ID: <20260404163943.89278-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260404163943.89278-1-sj@kernel.org> References: <20260404163943.89278-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CF9CFA0009 X-Stat-Signature: ereg1ueu5pucd8kqnqmkn68beisom5uo X-Rspam-User: X-HE-Tag: 1775320796-441031 X-HE-Meta: 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 5dkP8/FI j30PlqHHd3mtIlW2a1WqI+wHDFaZiF7kAn8RlDJkNwN5ATJQ9nmrROSg/xt7vvGcXEMF5WOyBqvn6L9CmHWFZi7jdv6nydIWgHOJANIxsD31XK/L3Ptb9eJQfa7uHMtYsnatPTYhxj6p6nztMlWxTIaK/jnhxQS2cHmtabX1ZjDBOhxwbM3VVW7WzzUL4Axh6+HrGMTJvLK42/gz+K2z+QHB1leJtt8Pb3ppZ/lT5R1OREUA9htiZNAM54BUBrT83GlQFZ0vf0x+FDrQfYIFOThEqlwpEE8dO5T7aGQSCYNRpUi6f03ZKp1Ab7FGyMg0KiTkNNrZkiSxxqSK9IPqMa/SLnny/4plH4zwZ3PjJNDlqHplRHj8si+ms5g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Update DAMON usage document for the DAMOS action failed regions quota charge ratio control sysfs files. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index bfdb717441f05..ffb32bdbe34ff 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -84,7 +84,9 @@ comma (","). │ │ │ │ │ │ │ │ sz/min,max │ │ │ │ │ │ │ │ nr_accesses/min,max │ │ │ │ │ │ │ │ age/min,max - │ │ │ │ │ │ │ :ref:`quotas `/ms,bytes,reset_interval_ms,effective_bytes,goal_tuner + │ │ │ │ │ │ │ :ref:`quotas `/ms,bytes,reset_interval_ms, + │ │ │ │ │ │ │ effective_bytes,goal_tuner, + │ │ │ │ │ │ │ fail_charge_num,fail_charge_denom │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil │ │ │ │ │ │ │ │ :ref:`goals `/nr_goals │ │ │ │ │ │ │ │ │ 0/target_metric,target_value,current_value,nid,path @@ -381,9 +383,10 @@ schemes//quotas/ The directory for the :ref:`quotas ` of the given DAMON-based operation scheme. -Under ``quotas`` directory, five files (``ms``, ``bytes``, -``reset_interval_ms``, ``effective_bytes`` and ``goal_tuner``) and two -directories (``weights`` and ``goals``) exist. +Under ``quotas`` directory, seven files (``ms``, ``bytes``, +``reset_interval_ms``, ``effective_bytes``, ``goal_tuner``, ``fail_charge_num`` +and ``fail_charge_denom``) 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, @@ -402,6 +405,13 @@ the background design of the feature and the name of the selectable algorithms. Refer to :ref:`goals directory ` for the goals setup. +You can set the action-failed memory quota charging ratio by writing the +numerator and the denominator for the ratio to ``fail_charge_num`` and +`fail_charge_denom`` files, respectively. Reading those file will return the +current set values. Refer to :ref:`design +` for more details of +the ratio feature. + 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