Re: [Xen-devel] questions about ballooning

[weiming <zephyr.zhao@xxxxxxxxx>]

Thanks you, Daniel and Keir!
Now I get a more completed picture about ballooning.

A quick question:
So far, the ballooning is triggered manually, right? On theory, it
should be possible to automatically trigger ballooning on domains to
get memory resource more balanced. This requires the dom0 to monitor
the memory pressure of each domains. These information can be
collected by each balloon driver and sent to xen.

Is such function available on the xen commercial version? Is there any
plans to develop this in xen open source community?

Thanks!

On Nov 5, 2007 2:35 AM, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> On 4/11/07 17:28, "Daniel Stodden" <stodden@xxxxxxxxxx> wrote:
>
> > while you are at it, from xmdomain.cfg(5)
> >
> > memory:
> > Xen does not support overcommit of memory, so the total memory
> > of all guests (+ 64 MB needed for Xen) must be less than or
> > equal to the physical RAM in the machine.
> >
> > 'memory' is mem_map size, right? is this outdated or simply not true, or
> > am i missing something?
>
> No, 'memory' is total RAM currently assigned across all tests. It just means
> the obvious thing --- you can't assign more RAM than you have in your entire
> system!
>
>  -- KEir
>
>
>

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