mm/damon/sysfs: use only quota->goals

DAMON sysfs interface implements multiple quota auto-tuning goals on its
level since the DAMOS core logic was supporting only single goal.  Now the
core logic supports multiple goals on its level.  Update DAMON sysfs
interface to reuse the core logic and drop unnecessary duplicated multiple
goals implementation.

Link: https://lkml.kernel.org/r/20240219194431.159606-10-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/damon/sysfs-common.h

@@ -59,7 +59,7 @@ int damon_sysfs_schemes_clear_regions(
 		struct damon_sysfs_schemes *sysfs_schemes,
 		struct damon_ctx *ctx);
 
-void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
+int damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
 		struct damon_ctx *ctx);
 
 void damos_sysfs_update_effective_quotas(

mm/damon/sysfs-schemes.c

@@ -1887,30 +1887,34 @@ static unsigned long damos_sysfs_get_quota_score(void *arg)
 	return (unsigned long)arg;
 }
 
-static void damos_sysfs_set_quota_score(
+static int damos_sysfs_set_quota_score(
 		struct damos_sysfs_quota_goals *sysfs_goals,
 		struct damos_quota *quota)
 {
-	struct damos_sysfs_quota_goal *sysfs_goal;
+	struct damos_quota_goal *goal, *next;
 	int i;
 
-	quota->goal.get_score = NULL;
-	quota->goal.get_score_arg = (void *)0;
+	damos_for_each_quota_goal_safe(goal, next, quota)
+		damos_destroy_quota_goal(goal);
+
 	for (i = 0; i < sysfs_goals->nr; i++) {
-		sysfs_goal = sysfs_goals->goals_arr[i];
+		struct damos_sysfs_quota_goal *sysfs_goal =
+			sysfs_goals->goals_arr[i];
+
 		if (!sysfs_goal->target_value)
 			continue;
 
-		/* Higher score makes scheme less aggressive */
-		quota->goal.get_score_arg = (void *)max(
-				(unsigned long)quota->goal.get_score_arg,
-				sysfs_goal->current_value * 10000 /
-				sysfs_goal->target_value);
-		quota->goal.get_score = damos_sysfs_get_quota_score;
+		goal = damos_new_quota_goal(damos_sysfs_get_quota_score,
+				(void *)(sysfs_goal->current_value * 10000 /
+				sysfs_goal->target_value));
+		if (!goal)
+			return -ENOMEM;
+		damos_add_quota_goal(quota, goal);
 	}
+	return 0;
 }
 
-void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
+int damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
 		struct damon_ctx *ctx)
 {
 	struct damos *scheme;
@@ -1918,16 +1922,21 @@ void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
 
 	damon_for_each_scheme(scheme, ctx) {
 		struct damon_sysfs_scheme *sysfs_scheme;
+		int err;
 
 		/* user could have removed the scheme sysfs dir */
 		if (i >= sysfs_schemes->nr)
 			break;
 
 		sysfs_scheme = sysfs_schemes->schemes_arr[i];
-		damos_sysfs_set_quota_score(sysfs_scheme->quotas->goals,
+		err = damos_sysfs_set_quota_score(sysfs_scheme->quotas->goals,
 				&scheme->quota);
+		if (err)
+			/* kdamond will clean up schemes and terminated */
+			return err;
 		i++;
 	}
+	return 0;
 }
 
 void damos_sysfs_update_effective_quotas(
@@ -1987,13 +1996,17 @@ static struct damos *damon_sysfs_mk_scheme(
 		.low = sysfs_wmarks->low,
 	};
 
-	damos_sysfs_set_quota_score(sysfs_quotas->goals, &quota);
-
 	scheme = damon_new_scheme(&pattern, sysfs_scheme->action,
 			sysfs_scheme->apply_interval_us, &quota, &wmarks);
 	if (!scheme)
 		return NULL;
 
+	err = damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota);
+	if (err) {
+		damon_destroy_scheme(scheme);
+		return NULL;
+	}
+
 	err = damon_sysfs_set_scheme_filters(scheme, sysfs_filters);
 	if (err) {
 		damon_destroy_scheme(scheme);
@@ -2029,7 +2042,11 @@ static void damon_sysfs_update_scheme(struct damos *scheme,
 	scheme->quota.weight_nr_accesses = sysfs_weights->nr_accesses;
 	scheme->quota.weight_age = sysfs_weights->age;
 
-	damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota);
+	err = damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota);
+	if (err) {
+		damon_destroy_scheme(scheme);
+		return;
+	}
 
 	scheme->wmarks.metric = sysfs_wmarks->metric;
 	scheme->wmarks.interval = sysfs_wmarks->interval_us;

mm/damon/sysfs.c

@@ -1377,8 +1377,7 @@ static int damon_sysfs_commit_schemes_quota_goals(
 
 	ctx = sysfs_kdamond->damon_ctx;
 	sysfs_ctx = sysfs_kdamond->contexts->contexts_arr[0];
-	damos_sysfs_set_quota_scores(sysfs_ctx->schemes, ctx);
-	return 0;
+	return damos_sysfs_set_quota_scores(sysfs_ctx->schemes, ctx);
 }
 
 /*