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xen-ppc-devel
Re: [XenPPC] Re: xen heap size
* Jimi Xenidis <jimix@xxxxxxxxxxxxxx> [2007-02-22 19:30]:
> We don't consider the RMA boundary for the Xen heap at all anymore
> (not for a while)
> The Xen heap is calculated based on the estimated resources we'll need.
> on example is that we need to get enough HTABs for all the domain, so
> 1/64th of all of memory is part of the Xen heap size.
Hrm. One of the items I need to address is determining how much of
dom0's memory allocation runs into the 2-4G IO hole. One method I was
hoping might work is:
/* overlap in pages into 2G-4G IO range (if any) */
dom0_overlap = (cpu_default_rma_order_pages() + dom0_nrpages) -
IO_SIZE_PAGES;
It doesn't look like we can make the assumption that Xen+xenheap will
only occupy the first RMA of the platform.
The other method I was going to look into was to allocate dom0's rma,
and then calculation would look like:
dom0_start_mfn = page_to_mfn(d->arch.rma_base);
dom0_overlap = (dom0_start_mfn + dom0_nrpages - rma_sz) - IO_SIZE_PAGES;
Any other good way to figure how much of dom0's allocation will fall
within 2-4G IO hole?
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
ryanh@xxxxxxxxxx
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