[Qemu-devel] Re: virtio: Add memory statistics reporting to the balloon driver (V8)

[Luiz Capitulino <lcapitulino@redhat.com>]

On Tue, 09 Mar 2010 08:48:43 -0600
Adam Litke <agl@us.ibm.com> wrote:

> On Tue, 2010-03-09 at 11:22 -0300, Luiz Capitulino wrote:
> > On Tue, 09 Mar 2010 14:51:31 +0100
> > Juan Quintela <quintela@redhat.com> wrote:
> > 
> > > Any recompilation/etc would break migration.  I have tried to understand
> > > what happened with monitor async commands, and my head exploded in
> > > indirections.
> > 
> >  The Monitor needs lots of cleanups to make things more obvious.
> > 
> > > Is there any written explanation of what are we trying to do here?
> > 
> >  Only the commit log 940cc30.
> > 
> >  Basically, an asynchronous handler has a completion function which is
> > called when the handler completes.
> > 
> >  If we're in the user Monitor, it's suspended until the completion
> > function is called. In QMP, the handler returns immediately and we
> > _should_ be emitting an event when we have the answer.
> > 
> >  The current code doesn't do that, which seems to be a new issue.
> 
> With current git, I cannot get QMP to recognize any commands.  Unless
> this is a known issue, I will look into it further to see what has
> caused it.

 You have to issue the 'qmp_capabilites' command before issuing commands,
take a look at the QMP/README and QMP/qmp-spec.txt files.