Re: [libvirt] [PATCHv4 4/4] blkiotune: add qemu support for blkiotune.device_weight

From: Hu Tao <hutao(a)cn.fujitsu.com&gt; Implement setting/getting per-device blkio weights in qemu, using the cgroups blkio.weight_device tunable.

+ if (vm->def->blkio.ndevices) { + if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) { + for (i = 0; i < vm->def->blkio.ndevices; i++) { + virBlkioDeviceWeightPtr dw = &vm->def->blkio.devices[i]; + rc = virCgroupSetBlkioDeviceWeight(cgroup, dw->path, + dw->weight); + if (rc != 0) { + virReportSystemError(-rc, + _("Unable to set io device weight " + "for domain %s"), + vm->def->name); + goto cleanup; + } + } + } else { + qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("Block I/O tuning is not available on this host")); + }