mm/damon: support multiple goal-based quota tuning algorithms

index a4fea23da8576..25345b5f821b9 100644
@@ -213,6 +213,14 @@ struct damos_quota_goal {
 	struct list_head list;
 };
 
+/**
+ * enum damos_quota_goal_tuner - Goal-based quota tuning logic.
+ * @DAMOS_QUOTA_GOAL_TUNER_CONSIST:	Aim long term consistent quota.
+ */
+enum damos_quota_goal_tuner {
+	DAMOS_QUOTA_GOAL_TUNER_CONSIST,
+};
+
 /**
  * struct damos_quota - Controls the aggressiveness of the given scheme.
  * @reset_interval:	Charge reset interval in milliseconds.

@@ -260,6 +268,7 @@ struct damos_quota {
 	unsigned long ms;
 	unsigned long sz;
 	struct list_head goals;
+	enum damos_quota_goal_tuner goal_tuner;
 	unsigned long esz;
 
 	unsigned int weight_sz;

index 0ff190ed8a599..1c126d910fe62 100644
@@ -405,8 +405,9 @@ struct damos *damon_new_scheme(struct damos_access_pattern *pattern,
 	INIT_LIST_HEAD(&scheme->list);
 
 	scheme->quota = *(damos_quota_init(quota));
-	/* quota.goals should be separately set by caller */
+	/* quota.goals and .goal_tuner should be separately set by caller */
 	INIT_LIST_HEAD(&scheme->quota.goals);
+	scheme->quota.goal_tuner = DAMOS_QUOTA_GOAL_TUNER_CONSIST;
 
 	scheme->wmarks = *wmarks;
 	scheme->wmarks.activated = true;

@@ -860,6 +861,7 @@ static int damos_commit_quota(struct damos_quota *dst, struct damos_quota *src)
 	err = damos_commit_quota_goals(dst, src);
 	if (err)
 		return err;
+	dst->goal_tuner = src->goal_tuner;
 	dst->weight_sz = src->weight_sz;
 	dst->weight_nr_accesses = src->weight_nr_accesses;
 	dst->weight_age = src->weight_age;

index 25345b5f821b9..0ab247fb06ca8 100644
@@ -216,9 +216,11 @@ struct damos_quota_goal {
 /**
  * enum damos_quota_goal_tuner - Goal-based quota tuning logic.
  * @DAMOS_QUOTA_GOAL_TUNER_CONSIST:	Aim long term consistent quota.
+ * @DAMOS_QUOTA_GOAL_TUNER_TEMPORAL:	Aim zero quota asap.
  */
 enum damos_quota_goal_tuner {
 	DAMOS_QUOTA_GOAL_TUNER_CONSIST,
+	DAMOS_QUOTA_GOAL_TUNER_TEMPORAL,
 };
 
 /**

index 1c126d910fe62..81e3ef737be77 100644
@@ -2217,6 +2217,26 @@ static unsigned long damos_quota_score(struct damos_quota *quota)
 	return highest_score;
 }
 
+static void damos_goal_tune_esz_bp_consist(struct damos_quota *quota)
+{
+	unsigned long score = damos_quota_score(quota);
+
+	quota->esz_bp = damon_feed_loop_next_input(
+			max(quota->esz_bp, 10000UL), score);
+}
+
+static void damos_goal_tune_esz_bp_temporal(struct damos_quota *quota)
+{
+	unsigned long score = damos_quota_score(quota);
+
+	if (score >= 10000)
+		quota->esz_bp = 0;
+	else if (quota->sz)
+		quota->esz_bp = quota->sz * 10000;
+	else
+		quota->esz_bp = ULONG_MAX;
+}
+
 /*
  * Called only if quota->ms, or quota->sz are set, or quota->goals is not empty
  */

@@ -2231,11 +2251,10 @@ static void damos_set_effective_quota(struct damos_quota *quota)
 	}
 
 	if (!list_empty(&quota->goals)) {
-		unsigned long score = damos_quota_score(quota);
-
-		quota->esz_bp = damon_feed_loop_next_input(
-				max(quota->esz_bp, 10000UL),
-				score);
+		if (quota->goal_tuner == DAMOS_QUOTA_GOAL_TUNER_CONSIST)
+			damos_goal_tune_esz_bp_consist(quota);
+		else if (quota->goal_tuner == DAMOS_QUOTA_GOAL_TUNER_TEMPORAL)
+			damos_goal_tune_esz_bp_temporal(quota);
 		esz = quota->esz_bp / 10000;
 	}
 

index 2b05a64771884..b30d9139b1c23 100644
@@ -1492,6 +1492,7 @@ struct damon_sysfs_quotas {
 	unsigned long sz;
 	unsigned long reset_interval_ms;
 	unsigned long effective_sz;	/* Effective size quota in bytes */
+	enum damos_quota_goal_tuner goal_tuner;
 };
 
 static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void)

@@ -1614,6 +1615,58 @@ static ssize_t effective_bytes_show(struct kobject *kobj,
 	return sysfs_emit(buf, "%lu\n", quotas->effective_sz);
 }
 
+struct damos_sysfs_qgoal_tuner_name {
+	enum damos_quota_goal_tuner tuner;
+	char *name;
+};
+
+static struct damos_sysfs_qgoal_tuner_name damos_sysfs_qgoal_tuner_names[] = {
+	{
+		.tuner = DAMOS_QUOTA_GOAL_TUNER_CONSIST,
+		.name = "consist",
+	},
+	{
+		.tuner = DAMOS_QUOTA_GOAL_TUNER_TEMPORAL,
+		.name = "temporal",
+	},
+};
+
+static ssize_t goal_tuner_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(damos_sysfs_qgoal_tuner_names); i++) {
+		struct damos_sysfs_qgoal_tuner_name *tuner_name;
+
+		tuner_name = &damos_sysfs_qgoal_tuner_names[i];
+		if (tuner_name->tuner == quotas->goal_tuner)
+			return sysfs_emit(buf, "%s\n", tuner_name->name);
+	}
+	return -EINVAL;
+}
+
+static ssize_t goal_tuner_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(damos_sysfs_qgoal_tuner_names); i++) {
+		struct damos_sysfs_qgoal_tuner_name *tuner_name;
+
+		tuner_name = &damos_sysfs_qgoal_tuner_names[i];
+		if (sysfs_streq(buf, tuner_name->name)) {
+			quotas->goal_tuner = tuner_name->tuner;
+			return count;
+		}
+	}
+	return -EINVAL;
+}
+
 static void damon_sysfs_quotas_release(struct kobject *kobj)
 {
 	kfree(container_of(kobj, struct damon_sysfs_quotas, kobj));

@@ -1631,11 +1684,15 @@ static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr =
 static struct kobj_attribute damon_sysfs_quotas_effective_bytes_attr =
 		__ATTR_RO_MODE(effective_bytes, 0400);
 
+static struct kobj_attribute damon_sysfs_quotas_goal_tuner_attr =
+		__ATTR_RW_MODE(goal_tuner, 0600);
+
 static struct attribute *damon_sysfs_quotas_attrs[] = {
 	&damon_sysfs_quotas_ms_attr.attr,
 	&damon_sysfs_quotas_sz_attr.attr,
 	&damon_sysfs_quotas_reset_interval_ms_attr.attr,
 	&damon_sysfs_quotas_effective_bytes_attr.attr,
+	&damon_sysfs_quotas_goal_tuner_attr.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(damon_sysfs_quotas);

@@ -2726,6 +2783,7 @@ static struct damos *damon_sysfs_mk_scheme(
 		.weight_sz = sysfs_weights->sz,
 		.weight_nr_accesses = sysfs_weights->nr_accesses,
 		.weight_age = sysfs_weights->age,
+		.goal_tuner = sysfs_quotas->goal_tuner,
 	};
 	struct damos_watermarks wmarks = {
 		.metric = sysfs_wmarks->metric,