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Thu, 29 Jan 2026 13:58:20 -0800 (PST) From: Ravi Jonnalagadda To: sj@kernel.org, damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: akpm@linux-foundation.org, corbet@lwn.net, bijan311@gmail.com, ajayjoshi@micron.com, honggyu.kim@sk.com, yunjeong.mun@sk.com, Ravi Jonnalagadda Subject: [PATCH 1/3] mm/damon/core: add DAMOS_QUOTA_NODE_TARGET_MEM_BP metric Date: Thu, 29 Jan 2026 13:58:12 -0800 Message-ID: <20260129215814.1618-2-ravis.opensrc@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260129215814.1618-1-ravis.opensrc@gmail.com> References: <20260129215814.1618-1-ravis.opensrc@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a new quota goal metric DAMOS_QUOTA_NODE_TARGET_MEM_BP for physical address space-based DAMON operation schemes. This metric represents the ratio of scheme-eligible memory on a specific NUMA node to that node's total capacity, expressed in basis points (1/10000). The metric enables auto-tuning of DAMOS quotas based on how much memory on a node matches the scheme's access pattern criteria, which is essential for controlling memory migration in heterogeneous memory systems (e.g., DRAM and CXL memory tiering). Suggested-by: SeongJae Park Signed-off-by: Ravi Jonnalagadda --- include/linux/damon.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 3813373a9200..5eebb8aaab85 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -155,6 +155,7 @@ enum damos_action { * @DAMOS_QUOTA_NODE_MEM_FREE_BP: MemFree ratio of a node. * @DAMOS_QUOTA_NODE_MEMCG_USED_BP: MemUsed ratio of a node for a cgroup. * @DAMOS_QUOTA_NODE_MEMCG_FREE_BP: MemFree ratio of a node for a cgroup. + * @DAMOS_QUOTA_NODE_TARGET_MEM_BP: Scheme-eligible memory ratio of a node. * @NR_DAMOS_QUOTA_GOAL_METRICS: Number of DAMOS quota goal metrics. * * Metrics equal to larger than @NR_DAMOS_QUOTA_GOAL_METRICS are unsupported. @@ -166,6 +167,7 @@ enum damos_quota_goal_metric { DAMOS_QUOTA_NODE_MEM_FREE_BP, DAMOS_QUOTA_NODE_MEMCG_USED_BP, DAMOS_QUOTA_NODE_MEMCG_FREE_BP, + DAMOS_QUOTA_NODE_TARGET_MEM_BP, NR_DAMOS_QUOTA_GOAL_METRICS, }; @@ -193,6 +195,9 @@ enum damos_quota_goal_metric { * * If @metric is DAMOS_QUOTA_NODE_MEMCG_{USED,FREE}_BP, @nid and @memcg_id * represents the node id and the cgroup to account the used memory for. + * + * If @metric is DAMOS_QUOTA_NODE_TARGET_MEM_BP, @nid represents the node + * to measure scheme-eligible memory ratio against its capacity. */ struct damos_quota_goal { enum damos_quota_goal_metric metric; -- 2.43.0