On Wed, Aug 29, 2012 at 03:42:57PM +0200, Jiri Denemark wrote: > If cgroups are enabled in general but cpu cgroup is disabled in > qemu.conf or not mounted at all, libvirt would refuse to start any > domain even though scheduler parameters are not set in domain XML. > > This patch makes cpu cgroup mandatory only for domains that actually > want to use it. > --- > src/qemu/qemu_cgroup.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c > index be1b96d..df67ff3 100644 > --- a/src/qemu/qemu_cgroup.c > +++ b/src/qemu/qemu_cgroup.c > @@ -549,7 +549,8 @@ int qemuSetupCgroupForVcpu(struct qemud_driver *driver, virDomainObjPtr vm) > if (driver->cgroup == NULL) > return 0; /* Not supported, so claim success */ > > - if (!qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_CPU)) { > + if ((period || quota) && > + !qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_CPU)) { > virReportError(VIR_ERR_SYSTEM_ERROR, "%s", > _("cgroup cpu is not active")); > return -1; ACK, please push :-)