linux-kernel - [RFC PATCH 1/4] mm/damon: add struct damos_migrate

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Message-Id: <20250621173131.23917-2-sj@kernel.org>
Date: Sat, 21 Jun 2025 10:31:28 -0700
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bijan Tabatabai <bijantabatab@...ron.com>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 1/4] mm/damon: add struct damos_migrate_dest

Introduce a new struct, namely damos_migrate_dest, for specifying
multiple DAMOS' migration destination nodes and their weights.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 include/linux/damon.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/damon.h b/include/linux/damon.h
index bb58e36f019e..d60addd0b7c8 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -447,6 +447,22 @@ struct damos_access_pattern {
 	unsigned int max_age_region;
 };
 
+/**
+ * struct damos_migrate_dest - Migration destination nodes and their weights.
+ * @node_id_arr:	Array of migration destination node ids.
+ * @weight_arr:		Array of migration weights for @node_id_arr.
+ * @nr_dests:		Length of the @node_id_arr and @weight_arr arrays.
+ *
+ * @node_id_arr is an array of the ids of migration destination nodes.
+ * @weight_arr is an array of the weights for those.  The weights in
+ * @weight_arr are for nodes in @node_id_arr of same array index.
+ */
+struct damos_migrate_dest {
+	unsigned int *node_id_arr;
+	unsigned int *weight_arr;
+	size_t nr_dests;
+};
+
 /**
  * struct damos - Represents a Data Access Monitoring-based Operation Scheme.
  * @pattern:		Access pattern of target regions.
-- 
2.39.5