[libvirt] [PATCH] qemu: do not ask for balloon information if not used

[Daniel Veillard]

On Thu, Aug 12, 2010 at 01:36:06PM +0100, Daniel P. Berrange wrote:
> On Thu, Aug 12, 2010 at 02:07:41PM +0200, Daniel Veillard wrote:
> >  Basically a followup of the previous patch about balloon desactivation
> > if desactivated, to not ask for balloon information to qemu as we will
> > just get an error back.
> >  This can make a huge difference in the time needed for domain
> > information or list when a machine is loaded, and balloon has been
> > desactivated in the guests.
> > 
> > Note that the patch does a check in the GetDomainInfo function, to avoid
> > checking for job, getting a job, getting the monitor lock and cleaning
> > back which would be added operations if I had done this one level
> > down in qemuMonitorGetBalloonInfo()
> > The qemudDomainDumpXML() function also call qemuMonitorGetBalloonInfo()
> > so maybe the check should be duplicated there, I left that out of the
> > patch for now as this is an operation which sounds less time critical.
> > Or maybe the test should be added to qemuMonitorGetBalloonInfo() too
> > since it's exported from src/qemu/qemu_monitor.h and may end up being
> > used from other places in the future,
> 
> Nah, putting it in qemu_driver is the correct place. The qemu_monitor.h
> files are designed to not have any awareness of the virDomainDef
> structures - just simple commaands to talk to the monitor. We should
> add the same to DumpXML as you say.

  Okay, done and pushed,

   thanks !

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel at veillard.com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/