[libvirt] Re: [Qemu-devel] [PATCH 1/6] Allow multiple monitor devices (v2)

Anthony Liguori aliguori at us.ibm.com
Thu Apr 9 14:57:54 UTC 2009

Avi Kivity wrote:
> I'd make everything line-oriented.  Anything from the user up to \n is 
> buffered and ignored until the \n arrives.
> Once the \n arrives, the command is acted upon atomically, either 
> completing fully or launching an async notification.
> So the rules are: whenever the monitor is idle, a notification can be 
> printed out.

So by idle, you mean, the end of the output buffer ends in either '\n' 
or '\n(qemu) '.  The input buffer must also be empty.

> (qemu) notify enospace on
> (qemu) notify vnc-connect on
> (qemu)
> notification: vnc connection ...
> (qemu) notify migration-completion on
> (qemu) migrate -d ...
> notification: enospc on ide0-0
> (qemu) migrate_cancel
> notification: migration cancelled
> (qemu) migrate -d ...
> (qemu)
> notification: migration completed 

This hurts my eyes.  It's not human readable.  If we're going to do 
this, we might as well have a non-human mode which would oddly enough be 
more human readable.  If you do this, then your session looks an awful 
lot like my session from a previous note.

I think the thing that is missing is that the 'wait' command does not 
have to be part of the non-human mode.  In non-human mode, you are 
always doing an implicit wait.


Anthony Liguori

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