RE: [Xen-devel] RE: Ballooning up

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> true, if you don't intend to balloon up, there's no point wasting
> memory on unused page structures.

I think this is the key.  If dom0_mem is NOT specified, dom0
launches with (essentially) all the physical memory of the
machine, page tables are allocated in dom0 to map all of physical
memory, and auto-ballooning is necessary to launch guests.

If dom0_mem IS specified, it is often a much smaller number
than size of physical memory; why waste ~1.5% of physical memory
on page structures that will never be used?

If someone wants to add an option to augment dom0_mem to allow
memory-up-ballooning of dom0 above dom0_mem (and can justify
a reason why some user might ever use this functionality),
that's fine.  But let's not change the definition of the
dom0_mem option just because a bug fix happens to make it
possible.

My two cents,
Dan

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