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Howlett" , 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: [PATCH 6/8] Docs/mm/damon/design: document damos quota goal complement flag Date: Tue, 29 Sep 2026 01:01:09 -0700 Message-ID: <20260929080113.41708-7-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260929080113.41708-1-sj@kernel.org> References: <20260929080113.41708-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 366C740010 X-Stat-Signature: ezgiy17bqz9g894de3e3ok1okrc56ip8 X-Rspam-User: X-HE-Tag: 1790668895-102207 X-HE-Meta: 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 lNVtOcx0 hrxdB7KoWhbX00BB27YgHTH5wAjZBBkgGNzPjf+pWy7jhRY6OWAXMNmGDnOdag+3xRQsPbpVybsEZq72HPnxcLncGih0GcRjH1+3MP2CxlaVYfgz8D7RbCvv1c0QX7rnh5ybyu5dbavdPmy+YBZj/sWL4g1ALgnOlkc7K50FVMYrRlM3x3niusliWOVgd9ObiJKPnPF2OAXQvvjSbWbhDztYcEEUUBndV5D4pQM1/sYqtLcg= 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