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

[Eric Blake]

On 11/15/2011 12:22 AM, Hu Tao wrote:
> On Mon, Nov 14, 2011 at 09:30:02PM -0700, Eric Blake wrote:
>> From: Hu Tao <hutao at cn.fujitsu.com>
>>
>> Implement setting/getting per-device blkio weights in qemu,
>> using the cgroups blkio.weight_device tunable.

>>
>> +/* deviceWeightStr in the form of /device/path,weight,/device/path,weight
>> + * for example, /dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0,800
>> + */
>> +static int
>> +parseBlkioWeightDeviceStr(char *deviceWeightStr,
>> +                          virBlkioDeviceWeightPtr *dw, int *size,
>> +                          virCgroupPtr cgroup)

> 
> Does more than the function name says. Would it be better to just do the
> parsing here, and set the cgroup values after parsing(see my comment to
> patch 3 for filtering out 0-weight when writing to xml):

Either approach works for me (renaming this function more accurately so
that the domain_conf never has 0-weight entries, or going with your
improvements to allow 0-weight entries in the domain_conf def but not
expose them in the XML).  I guess whoever reviews this series can cast
the deciding vote on which of the two approaches we commit.

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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