Re: [Xen-devel] Revised balloon driver

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> Hi
> i'm willing to test it, i think i'm in xen 2.0 and not 2.0-testing.
> Is there an easy way to migrate ?

Just build the xen-2.0-testing tree instead of xen-2.0.

> To use the ballon driver, what is needed apart compiling the driver in xen0
> and xenU kernel ?

It is always built-in -- you don't need to configure anything.

> Is there a documentation ?

No. :-)  To use from within the domain, just 
 # echo <memsize> >/proc/xen/balloon.

> Couple of weeks ago i've seen a message stating that in order to be able to
> shrink/unshrink memory size you have to pass a parameter at xenU kernel at
> boot time . What is this parameter, have i misunderstood ?

If you want to be able to grow a domain's memory allocation to greater
than its initial allocation, you need to add a "mem=<maxmemsz>" boot
parameter to the guest OS. If you only want to grow/shrink within the
bounds of the initial allocation then you don't need to do this.

 -- Keir

> Mat
> On December 2, 5:45 pm Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> >
> > I've checked in a large number of changes to the balloon driver to the
> > 2.0-testing and unstable trees. There should now be rather fewer bugs
> > and the balloon will play more nicely with other device drivers (by
> > which I mean it is less likely to crash the VM).
> >
> > To see balloon info: cat /proc/xen/balloon
> > (I'm happy to receive feedback on the layout/contents. I confused
> > myself with it while testing so I guess it may not be very intuitive
> > right now :-).
> >
> > To set memory target: echo <memsz> >/proc/xen/balloon
> > (<memsz> is e.g., 300M, 2G, whatever).
> >
> > NOTE: If you set the memory target too low it is still very easy to
> > kill your VM (on 2.6 the OOM killer gets activated). I'm not sure how
> > avoidable this is -- for now you'll just have to exercise caution when
> > reducing the target below a few 10's of MBs.
> >
> >  -- Keir
> >
> 
> 
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