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

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> 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.

I'm not sure I do - could you elaborate ;-)

Cheers,
Mark

> 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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