[libvirt] [PATCH v7 2/6] qapi: Introduce add-fd, remove-fd, query-fdsets

[Eric Blake]

On 08/07/2012 11:07 AM, Corey Bryant wrote:

>>> +#
>>> +# Since: 1.2.0
>>
>> We're not very consistent on '1.2' vs. '1.2.0' in since listings, but
>> that's probably worth a global cleanup closer to hard freeze.
>>
> 
> I'll make a note of it.  Or does Luiz usually do a cleanup?

No idea.

>>> +##
>>> +{ 'type': 'FdsetFdInfo', 'data': {'fd': 'int', 'removed': 'bool'} }
>>
>> Is it worth providing any additional information?  For example, knowing
>> whether the fd is O_RDONLY, O_WRONLY, or O_RDWR might be beneficial to
>> management apps trying to discover what fds are already present after a
>> reconnection, in order to decide whether to close them without having to
>> resort to /proc/$qemupid/fdinfo/nnn lookups.  It might even be worth
>> marking such information optional, present only when 'removed':false.
>>
> 
> It makes sense but I'd like to limit the new functionality at this point
> so that I can get this support into QEMU 1.2.  Can this be added as a
> follow up patch?

I'm personally okay with the idea of adding additional output fields in
later releases, but I know that has been questioned in the past, so you
may want to get buy-in from Luiz or Anthony.  I guess the other thing is
to see what libvirt would actually find useful, once I complete some
counterpart libvirt patches.  If libvirt can get by without any extra
information and without needing to hack things from procfs, then it's
not worth you spending the effort coding something that will be ignored;
conversely, if a piece of info is so important that I end up hacking
procfs anyways, that says we have a hole in QMP.  I'm okay waiting for now.

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

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