linux-kernel - [RFC PATCH 05/11] mm/damon/sysfs-schemes: connect quota goal path file to DAMON core

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Message-Id: <20250619220023.24023-6-sj@kernel.org>
Date: Thu, 19 Jun 2025 15:00:17 -0700
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	damon@...ts.linux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH 05/11] mm/damon/sysfs-schemes: connect quota goal path file to DAMON core

Read and commit the user-specified cgroup information for
DAMOS_QUOTA_NODE_MEMCG_USED_BP to DAMON core.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/sysfs-schemes.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 4a340baa72a4..89e5e40bdf63 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1030,6 +1030,10 @@ static struct damos_sysfs_qgoal_metric_name damos_sysfs_qgoal_metric_names[] =
 		.metric = DAMOS_QUOTA_NODE_MEM_FREE_BP,
 		.name = "node_mem_free_bp",
 	},
+	{
+		.metric = DAMOS_QUOTA_NODE_MEMCG_USED_BP,
+		.name = "node_memcg_used_bp",
+	},
 	{
 		.metric = DAMOS_QUOTA_ACTIVE_MEM_BP,
 		.name = "active_mem_bp",
@@ -2317,7 +2321,7 @@ static int damos_sysfs_add_quota_score(
 		struct damos_quota *quota)
 {
 	struct damos_quota_goal *goal;
-	int i;
+	int i, err;
 
 	for (i = 0; i < sysfs_goals->nr; i++) {
 		struct damos_sysfs_quota_goal *sysfs_goal =
@@ -2338,6 +2342,15 @@ static int damos_sysfs_add_quota_score(
 		case DAMOS_QUOTA_NODE_MEM_FREE_BP:
 			goal->nid = sysfs_goal->nid;
 			break;
+		case DAMOS_QUOTA_NODE_MEMCG_USED_BP:
+			err = damon_sysfs_memcg_path_to_id(
+					sysfs_goal->path, &goal->memcg_id);
+			if (err) {
+				damos_destroy_quota_goal(goal);
+				return err;
+			}
+			goal->nid = sysfs_goal->nid;
+			break;
 		default:
 			break;
 		}
-- 
2.39.5