Re: [libvirt] [PATCH v3 4/6] qemu: Implement period and quota tunable XML configuration and parsing

+int qemuSetupCgroupForVcpu(struct qemud_driver *driver, virDomainObjPtr vm) +{ + virCgroupPtr cgroup = NULL; + virCgroupPtr cgroup_vcpu = NULL; + qemuDomainObjPrivatePtr priv = vm->privateData; + int rc; + unsigned int i; + unsigned long long period = vm->def->cputune.period; + long long quota = vm->def->cputune.quota; + + if (driver->cgroup == NULL) + return 0; /* Not supported, so claim success */ + + rc = virCgroupForDomain(driver->cgroup, vm->def->name, &cgroup, 0); + if (rc != 0) { + virReportSystemError(-rc, + _("Unable to find cgroup for %s"), + vm->def->name); + goto cleanup; + } + + if (priv->nvcpupids == 0 || priv->vcpupids[0] == vm->pid) { + /* If we does not know VCPU<->PID mapping or all vcpu runs in the same + * thread, we can not control each vcpu. + */ + if (period || quota) { + if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_CPU)) { + if (qemuSetupCgroupVcpuBW(cgroup, period, quota) < 0) + goto cleanup; + } + } + return 0; + }