change default RC_CGROUP_MODE to unified

This improves resource management by assigning services to individual
cgroups.

X-Gentoo-Bug: https://bugs.gentoo.org/914972

etc/rc.conf

@@ -199,7 +199,7 @@ rc_tty_number=12
 # cgroups version 1 on /sys/fs/cgroup.
 # "legacy" mounts cgroups version 1 on /sys/fs/cgroup
 # "unified" mounts cgroups version 2 on /sys/fs/cgroup
-#rc_cgroup_mode="hybrid"
+#rc_cgroup_mode="unified"
 
 # This is a list of controllers which should be enabled for cgroups version 2
 # when hybrid mode is being used.

init.d/cgroups.in

@@ -128,7 +128,7 @@ cgroups_unified()
 
 mount_cgroups()
 {
-	case "${rc_cgroup_mode:-hybrid}" in
+	case "${rc_cgroup_mode:-unified}" in
 	hybrid) cgroups_hybrid ;;
 	legacy) cgroups_legacy ;;
 	unified) cgroups_unified ;;

sh/rc-cgroup.sh

@@ -154,7 +154,7 @@ cgroup_set_limits()
 cgroup2_find_path()
 {
 	if grep -qw cgroup2 /proc/filesystems; then
-		case "${rc_cgroup_mode:-hybrid}" in
+		case "${rc_cgroup_mode:-unified}" in
 			hybrid) printf "/sys/fs/cgroup/unified" ;;
 			unified) printf "/sys/fs/cgroup" ;;
 		esac