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Howlett" , Andrew Morton , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Randy Dunlap , 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 v4 5/7] Docs/mm/damon/design: document damos quota goal complement flag Date: Sun, 27 Sep 2026 05:05:29 -0700 Message-ID: <20260927120533.50484-6-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260927120533.50484-1-sj@kernel.org> References: <20260927120533.50484-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: C55EA18000B X-Rspam-User: X-Stat-Signature: hbnxz6tj17sd1x4fcp58kp8jemi1bpcs X-HE-Tag: 1790510757-634068 X-HE-Meta: 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 HJzyKzWB rzlzDyEpmN/ApnKt5BtjMMHvG5e3XrkTQD9x/e2bJKaUORNxBrusquFoTqa2H7UAAWKz0em3XaLlmnkVmhShOyHdPHemhm9PMnl/KfJhjVFEJyDMnjWU/AgIA9V/bs1PPihbwSUiTmeR1ICOx5BgpOf27zQ8kbsLIWk6tH5YpBauvpa8jR3bDve5xLQlGsxbN3Vl+FG1KZdTZ9FK6QZbezck/pDUZhDhA5ALGicig+LT5LrI= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Update DAMON design document for the newly added damos quota goal metric value complement flag. Signed-off-by: SJ Park --- Documentation/mm/damon/design.rst | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index e82390e77a70..5cd651b1b7aa 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -702,10 +702,10 @@ There are two such tuning algorithms that users can select as they need. that the zero quota is a valid quota, and therefore ``qt_exceeds`` :ref:`stat ` will keep increasing in this case. -The goal can be specified with five parameters, namely ``target_metric``, -``target_value``, ``current_value``, ``nid`` and ``path``. The auto-tuning -mechanism tries to make ``current_value`` of ``target_metric`` be same to -``target_value``. +The goal can be specified with six parameters, namely ``target_metric``, +``complement``, ``target_value``, ``current_value``, ``nid`` and ``path``. The +auto-tuning mechanism tries to make ``current_value`` of ``complement``-ed +``target_metric`` be same to ``target_value``. - ``user_input``: User-provided value. Users could use any metric that they has interest in for the value. Use space main workload's latency or @@ -733,6 +733,13 @@ mechanism tries to make ``current_value`` of ``target_metric`` be same to - ``hugepage_mem_bp``: Total huge page to total used memory ratio in bp (1/10,000). +``complement`` is a boolean parameter that determines whether to use +complemented value of the target metric. For example, if ``complement`` is set +and target metric is ``active_mem_bp``, it is effectively same to +``inactive_mem_bp``. ``complement`` is no-op when the target metric type is +``user_input``. For the metric type, the user should be able to emit +complemented metric values on their own. + ``nid`` is optionally required for ``node_mem_used_bp``, ``node_mem_free_bp``, ``node_memcg_used_bp``, ``node_memcg_free_bp`` and ``node_eligible_mem_bp`` to point the specific NUMA node. -- 2.47.3