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Re: [Xen-devel] Discussion: Add API to retrieve migration progress

On Tue, 2013-11-12 at 01:37 -0700, Bamvor Jian Zhang wrote:
> Hi, Ian
> > On Fri, 2013-11-08 at 16:10 +0800, Chunyan Liu wrote:
> > > 
> > > 2013/11/8 Chunyan Liu <cyliu@xxxxxxxx>
> > >  Hi, list,
> > >  
> > >  One customer requests that we should show migration progress
> > >  bar in 'xl migrate' or 'virsh migrate', like '-h/--hash'
> > >  option in 'rpm' command, so that they could see clearly what
> > >  happened in migration period. To deal with that, we need to
> > >  have a method to retrieve migration progress. And we hope such
> > >  stuff could be finally merged to upstream. How do you think?
> > 
> > The current code uses the xtl logging facilities, which IIRC includes
> > support for progress reporting. xl by default uses the stdio output
> > implementation provided by the library, which I think logs the progress
> > as "\rFOO%" but this could be enhanced to use # instead, either by
> > enhancing the xtl stdio module of by xl providing a customised version
> > (I think I would prefer the first option). It may also be that the
> > priority of these messages is not high enough that they are shown by
> > default. Have you tried "xl -vvv migrate"? Perhaps --hash just needs to
> > adjust the relevant thresholds.
> yes, "xl -vvv migrate" output lots of logs including migrate progress. it
> is ok for developers, meanwhile it is hard for users to know the step of
> current migration. 
> is there any chance to output the migrate progress alone?

Hopefully by adjusting the default thresholds as I suggested. If not
then perhaps a custom xtl logger module, or an enhancement to the
existing stdio module, might be needed.


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