linux-kernel - [RFC PATCH v3 07/13] mm/damon/core: Commit damos->target_nid/migrate

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Message-ID: <20250702201337.5780-8-bijan311@gmail.com>
Date: Wed,  2 Jul 2025 15:13:30 -0500
From: Bijan Tabatabai <bijan311@...il.com>
To: damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Cc: sj@...nel.org,
	akpm@...ux-foundation.org,
	corbet@....net,
	joshua.hahnjy@...il.com,
	bijantabatab@...ron.com,
	venkataravis@...ron.com,
	emirakhur@...ron.com,
	ajayjoshi@...ron.com,
	vtavarespetr@...ron.com
Subject: [RFC PATCH v3 07/13] mm/damon/core: Commit damos->target_nid/migrate_dests

From: Bijan Tabatabai <bijantabatab@...ron.com>

When committing new scheme parameters from the sysfs, copy the
target_nid and migrate_dests of the source schemes into the destination
schemes.

Signed-off-by: Bijan Tabatabai <bijantabatab@...ron.com>
---
 mm/damon/core.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index a4c3cfe531df..0565aae8d1fa 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -943,6 +943,41 @@ static void damos_set_filters_default_reject(struct damos *s)
 		damos_filters_default_reject(&s->ops_filters);
 }
 
+static int damos_commit_dests(struct damos *dst, struct damos *src)
+{
+	struct damos_migrate_dests *dst_dests, *src_dests;
+
+	dst_dests = &dst->migrate_dests;
+	src_dests = &src->migrate_dests;
+
+	if (dst_dests->nr_dests != src_dests->nr_dests) {
+		kfree(dst_dests->node_id_arr);
+		kfree(dst_dests->weight_arr);
+
+		dst_dests->node_id_arr = kmalloc_array(src_dests->nr_dests,
+			sizeof(*dst_dests->node_id_arr), GFP_KERNEL);
+		if (!dst_dests->node_id_arr) {
+			dst_dests->weight_arr = NULL;
+			return -ENOMEM;
+		}
+
+		dst_dests->weight_arr = kmalloc_array(src_dests->nr_dests,
+			sizeof(*dst_dests->weight_arr), GFP_KERNEL);
+		if (!dst_dests->weight_arr) {
+			/* ->node_id_arr will be freed by scheme destruction */
+			return -ENOMEM;
+		}
+	}
+
+	dst_dests->nr_dests = src_dests->nr_dests;
+	for (int i = 0; i < src_dests->nr_dests; i++) {
+		dst_dests->node_id_arr[i] = src_dests->node_id_arr[i];
+		dst_dests->weight_arr[i] = src_dests->weight_arr[i];
+	}
+
+	return 0;
+}
+
 static int damos_commit_filters(struct damos *dst, struct damos *src)
 {
 	int err;
@@ -983,6 +1018,11 @@ static int damos_commit(struct damos *dst, struct damos *src)
 
 	dst->wmarks = src->wmarks;
 
+	dst->target_nid = src->target_nid;
+	err = damos_commit_dests(dst, src);
+	if (err)
+		return err;
+
 	err = damos_commit_filters(dst, src);
 	return err;
 }
-- 
2.43.5