Re: [Xen-devel] out-of-memory problem when restoringballooneddomains

[Lars Rasmusson <Lars.Rasmusson@xxxxxx>]

Hi, about two months ago I inquired about if xen could restore (or 
migrate) a *ballooned* domain if its unballoned size won't fit.

Example: on a 2G machine

  xm create domain1 memory=1500
  xm balloon domain1 128
  xm save domain1 saved1

  xm create domain2 memory=1500

  xm restore saved1
  *** BEEP! Xen refuses ***

Is there any news on this issue?  

I think this would be a very useful feature to have.

Even better would be if one could boot a machine giving it the impression 
pf having the whole memory space but without actually ever giving it all 
of memory, something like

  xm create domain1 memory=1500 balloon=128

if you see what I mean.

Anyway, thanks for all the cool stuff you're doing!

/Lars



On Fri, 11 Mar 2005, Keir Fraser wrote:

> 
> On 10 Mar 2005, at 23:35, Lars Rasmusson wrote:
> 
> > I think the relevant part from the log is this.
> >
> > xc_linux_restore start
> > Could not create domain. pfns=460800, 1843200KB
> > Could not create domain. pfns=460800, 1843200KB
> > 4526 [INF] XFRD> Xfr service err=1
> 
> Ah! The problem is that we initially create the domain with its 
> 'maximum possible' memory allocation, and then automatically 'balloon 
> it down' at the end of the restore operation. Of course by the third 
> domain you do not have 1.8GB of headroom and so the third restore 
> fails.
> 
> This probably made live relocation easier to implement, but we need to 
> change this to allocate only the memory that the domain is currently 
> using during each round of pre-copy migration. Getting non-live moved 
> over is the first step, and then fix live relocation, I guess.
> 
>   -- Keir
> 
> 
> 
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