diff --git a/mm/damon/core.c b/mm/damon/core.c
index a97d8799c228..71ccea40368d 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -1316,6 +1316,40 @@ static unsigned long damon_region_sz_limit(struct damon_ctx *ctx)
 	return sz;
 }
 
+static void damon_split_region_at(struct damon_target *t,
+				  struct damon_region *r, unsigned long sz_r);
+
+/*
+ * damon_apply_min_nr_regions() - Make effect of min_nr_regions parameter.
+ * @ctx:	monitoring context.
+ *
+ * This function implement min_nr_regions (minimum number of damon_region
+ * objects in the given monitoring context) behavior.  It first calculates
+ * maximum size of each region for enforcing the min_nr_regions as total size
+ * of the regions divided by the min_nr_regions.  After that, this function
+ * splits regions to ensure all regions are equal to or smaller than the size
+ * limit.  Finally, this function returns the maximum size limit.
+ *
+ * Returns: maximum size of each region for convincing min_nr_regions.
+ */
+static unsigned long damon_apply_min_nr_regions(struct damon_ctx *ctx)
+{
+	unsigned long max_region_sz = damon_region_sz_limit(ctx);
+	struct damon_target *t;
+	struct damon_region *r, *next;
+
+	max_region_sz = ALIGN(max_region_sz, ctx->min_region_sz);
+	damon_for_each_target(t, ctx) {
+		damon_for_each_region_safe(r, next, t) {
+			while (damon_sz_region(r) > max_region_sz) {
+				damon_split_region_at(t, r, max_region_sz);
+				r = damon_next_region(r);
+			}
+		}
+	}
+	return max_region_sz;
+}
+
 static int kdamond_fn(void *data);
 
 /*
@@ -1672,9 +1706,6 @@ static void kdamond_tune_intervals(struct damon_ctx *c)
 	damon_set_attrs(c, &new_attrs);
 }
 
-static void damon_split_region_at(struct damon_target *t,
-				  struct damon_region *r, unsigned long sz_r);
-
 static bool __damos_valid_target(struct damon_region *r, struct damos *s)
 {
 	unsigned long sz;
@@ -2763,7 +2794,7 @@ static int kdamond_fn(void *data)
 	if (!ctx->regions_score_histogram)
 		goto done;
 
-	sz_limit = damon_region_sz_limit(ctx);
+	sz_limit = damon_apply_min_nr_regions(ctx);
 
 	while (!kdamond_need_stop(ctx)) {
 		/*
@@ -2788,10 +2819,13 @@ static int kdamond_fn(void *data)
 		if (ctx->ops.check_accesses)
 			max_nr_accesses = ctx->ops.check_accesses(ctx);
 
-		if (ctx->passed_sample_intervals >= next_aggregation_sis)
+		if (ctx->passed_sample_intervals >= next_aggregation_sis) {
 			kdamond_merge_regions(ctx,
 					max_nr_accesses / 10,
 					sz_limit);
+			/* online updates might be made */
+			sz_limit = damon_apply_min_nr_regions(ctx);
+		}
 
 		/*
 		 * do kdamond_call() and kdamond_apply_schemes() after
@@ -2850,7 +2884,6 @@ static int kdamond_fn(void *data)
 				sample_interval;
 			if (ctx->ops.update)
 				ctx->ops.update(ctx);
-			sz_limit = damon_region_sz_limit(ctx);
 		}
 	}
 done: