diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c
index 120795e2daba49636808deb32f8d14d47d000b81..3f89cec8e2fb12faf20f8b53f3ef15a25783fb5d 100644
--- a/arch/arm64/kernel/mpam.c
+++ b/arch/arm64/kernel/mpam.c
@@ -858,7 +858,7 @@ 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;
 }
 
@@ -1143,6 +1143,7 @@ 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;
 	}
 
@@ -1156,6 +1157,10 @@ 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 2b94efc38eeb68ab9ba4aa36eb2e144e16463d09..850c52fb4cc847d104453df5f513593b3f7015c3 100644
--- a/arch/arm64/kernel/mpam_ctrlmon.c
+++ b/arch/arm64/kernel/mpam_ctrlmon.c
@@ -171,6 +171,9 @@ static int parse_line(char *line, struct resctrl_resource *r)
 			goto next;
 		}
 	}
+
+	rdt_last_cmd_printf("unknown domain (%lu)\n", dom_id);
+
 	return -EINVAL;
 }
 
@@ -224,6 +227,7 @@ 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();