Re: [Qemu-devel] [PATCH 5/6] Purge migration of (almost) everything to do with monitors

[Luiz Capitulino <lcapitulino@redhat.com>]

On Wed, 15 Feb 2012 10:02:54 +0100
Jan Kiszka <jan.kiszka@siemens.com> wrote:

> On 2012-02-10 20:31, Luiz Capitulino wrote:
> > The Monitor object is passed back and forth within the migration/savevm
> > code so that it can print errors and progress to the user.
> > 
> > However, that approach assumes a HMP monitor, being completely invalid
> > in QMP.
> > 
> > This commit drops almost every single usage of the Monitor object, all
> > monitor_printf() calls have been converted into DPRINTF() ones.
> 
> Particularly NACK on this. Either the information is useless anyway,
> then remove it. Otherwise, keep it for channels that can properly
> display it (AKA HMP). I bet the latter can easily be achieved by
> providing non-printing Monitor objects over QMP instances.

I will consider dropping it :)

I can think of two ways of displaying status in HMP (considering the new
HMP/QMP split design):

 1. We add all progress status information to a query command, and let HMP
    poll it (manually by the user or automatically from a timer)

 2. We emit an event whenever the progress status changes (seems a bit overkill)