[libvirt] [PATCH] Support for qemu aio drive option

[Eric Blake]

On 01/04/2011 09:33 AM, Daniel P. Berrange wrote:
>>> Does this deserve a new <iobackend> element, or should it merely be a
>>> new optional attribute of the existing <driver> element, as in:
>>>
>>> <driver name='qemu' type='qcow2' cache='none' iobackend='aiothreads'/>
>>
>> I slightly prefer making it a new attribute of <driver>.  The only reason I
>> can see to make it a new <iobackend> element is if we think it will get
>> significantly more complex in the future (necessitating new XML elements).  Do
>> we think that?
> 
> Yep, the whole '<driver>' element is really specifying an I/O backend,
> so I don't think it makes sense to add another <iobackend> element,
> nor is it particularly great as an attribute name. It should be an
> attribute on <driver> though

Any better ideas for an attribute name?  The complaint was that
Matthias' original proposal of naming the attribute 'aio' (as in <driver
aio='threads'/>) felt a bit too specific to qemu's implementation; yet
iobackend='aiothreads' is long.  Maybe just io?

<driver io='aiothreads'/>

where io maps to qemu's ,aio=threads designation, but leaves us
flexibility of adding other attribute values unrelated to the name aio?

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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