linux-kernel - [RFC PATCH 4/4] mm/damon/sysfs-schemes: set damos->migrate

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Message-Id: <20250621173131.23917-5-sj@kernel.org>
Date: Sat, 21 Jun 2025 10:31:31 -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 4/4] mm/damon/sysfs-schemes: set damos->migrate_dest

Pass user-specified multiple DAMOS action destinations and their weights
to DAMON core API, so that user requests can really work.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/sysfs-schemes.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index e04cd8d592b8..158a2be3fd45 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -2445,6 +2445,29 @@ void damos_sysfs_update_effective_quotas(
 	}
 }
 
+static int damos_sysfs_add_migrate_dest(struct damos *scheme,
+		struct damos_sysfs_dests *sysfs_dests)
+{
+	struct damos_migrate_dest *dest = &scheme->migrate_dest;
+	int i;
+
+	dest->node_id_arr = kmalloc_array(sysfs_dests->nr,
+			sizeof(*dest->node_id_arr), GFP_KERNEL);
+	if (!dest->node_id_arr)
+		return -ENOMEM;
+	dest->weight_arr = kmalloc_array(sysfs_dests->nr,
+			sizeof(*dest->weight_arr), GFP_KERNEL);
+	if (!dest->weight_arr)
+		/* ->node_id_arr will be freed by scheme destruction */
+		return -ENOMEM;
+	for (i = 0; i < sysfs_dests->nr; i++) {
+		dest->node_id_arr[i] = sysfs_dests->dests_arr[i]->id;
+		dest->weight_arr[i] = sysfs_dests->dests_arr[i]->weight;
+	}
+	dest->nr_dests = sysfs_dests->nr;
+	return 0;
+}
+
 static struct damos *damon_sysfs_mk_scheme(
 		struct damon_sysfs_scheme *sysfs_scheme)
 {
@@ -2507,6 +2530,11 @@ static struct damos *damon_sysfs_mk_scheme(
 		damon_destroy_scheme(scheme);
 		return NULL;
 	}
+	err = damos_sysfs_add_migrate_dest(scheme, sysfs_scheme->dests);
+	if (err) {
+		damon_destroy_scheme(scheme);
+		return NULL;
+	}
 	return scheme;
 }
 
-- 
2.39.5