This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


RE: [Xen-devel] RE: Ballooning up

> 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

My two cents,

Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>