diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c
index dc6dd566fc37dafb9cc4aa208b473ba9a56b9e75..30900c08f0eff26df978d057c91b3a661ec9ee3b 100644
--- a/arch/arm64/kernel/mpam.c
+++ b/arch/arm64/kernel/mpam.c
@@ -863,7 +863,7 @@ static int resctrl_num_mon_show(struct kernfs_open_file *of,
 int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,
 		   cpumask_var_t tmpmask)
 {
-	pr_info("unsupported on mon_groups, please use ctrlmon groups\n");
+	rdt_last_cmd_puts("temporarily unsupported write cpus on mon_groups\n");
 	return -EINVAL;
 }
 
@@ -1148,6 +1148,7 @@ static ssize_t resctrl_group_ctrlmon_write(struct kernfs_open_file *of,
 
 	if (!rdtgrp) {
 		ret = -ENOENT;
+		rdt_last_cmd_puts("directory was removed\n");
 		goto unlock;
 	}
 
@@ -1161,6 +1162,10 @@ static ssize_t resctrl_group_ctrlmon_write(struct kernfs_open_file *of,
 		if (!ret)
 			rdtgrp->flags |= RDT_CTRLMON;
 	} else {
+		if (ctrlmon)
+			rdt_last_cmd_printf("ctrlmon has been enabled\n");
+		else
+			rdt_last_cmd_printf("ctrlmon has been disabled\n");
 		ret = -ENOENT;
 	}
 
diff --git a/arch/arm64/kernel/mpam_ctrlmon.c b/arch/arm64/kernel/mpam_ctrlmon.c
index 90f34987e5b84db79a5a93256178b32bbdaf1e07..b62ab076bf30ac6a0b56dadebbbf2f7ed646d677 100644
--- a/arch/arm64/kernel/mpam_ctrlmon.c
+++ b/arch/arm64/kernel/mpam_ctrlmon.c
@@ -175,6 +175,9 @@ static int parse_line(char *line, struct resctrl_resource *r)
 			goto next;
 		}
 	}
+
+	rdt_last_cmd_printf("unknown domain (%lu)\n", dom_id);
+
 	return -EINVAL;
 }
 
@@ -228,6 +231,7 @@ ssize_t resctrl_group_schemata_write(struct kernfs_open_file *of,
 	rdtgrp = resctrl_group_kn_lock_live(of->kn);
 	if (!rdtgrp) {
 		resctrl_group_kn_unlock(of->kn);
+		rdt_last_cmd_puts("directory was removed\n");
 		return -ENOENT;
 	}
 	rdt_last_cmd_clear();