diff --git a/src/util/cgroup.c b/src/util/cgroup.c index 9a41a62dc3..afe873118a 100644 --- a/src/util/cgroup.c +++ b/src/util/cgroup.c @@ -527,9 +527,20 @@ static int virCgroupMakeGroup(virCgroupPtr parent, virCgroupPtr group, if (access(path, F_OK) != 0) { if (!create || mkdir(path, 0755) < 0) { - rc = -errno; - VIR_FREE(path); - break; + /* With a kernel that doesn't support multi-level directory + * for blkio controller, libvirt will fail and disable all + * other controllers even though they are available. So + * treat blkio as unmounted if mkdir fails. */ + if (i == VIR_CGROUP_CONTROLLER_BLKIO) { + rc = 0; + VIR_FREE(group->controllers[i].mountPoint); + VIR_FREE(path); + continue; + } else { + rc = -errno; + VIR_FREE(path); + break; + } } if (group->controllers[VIR_CGROUP_CONTROLLER_CPUSET].mountPoint != NULL && (i == VIR_CGROUP_CONTROLLER_CPUSET ||