Re: [Qemu-devel] Should we auto-generate IDs?

[Eric Blake <eblake@redhat.com>]

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On 08/27/2015 07:56 AM, Programmingkid wrote:

>> If we did have auto-generated names, we would need to come up with a
>> scheme that is not going to clash with any existing naming that users
>> of QEMU may already be doing, otherwise we risk causing a regression.
>> Something as simple as what you suggest has non-trivial chance of
>> clashing.
> 
> Actually there is a way to prevent clashing. When QEMU auto-generates a
> name, it could scan all the ID's to see if there is a clash. If the ID is already
> taken, just increment the ID until it is detected to be unique. The previous
> threads on this subject has patches that did just that. This means that a
> ID scheme that is just a single number would work without clashes. 

No, because you cannot predict what FUTURE names the user will request.
 The name generated by qemu must be IMPOSSIBLE to request manually, and
not just one that happens not to clash at the current moment.

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


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