Re: [XenPPC] Re: xen heap size

[Ryan Harper <ryanh@xxxxxxxxxx>]

* Hollis Blanchard <hollisb@xxxxxxxxxx> [2007-02-23 10:58]:
> On Fri, 2007-02-23 at 10:21 -0600, Ryan Harper wrote:
> > 
> > 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?
> 
> Why are you looking for another approach? What's wrong with this
> solution?

I was hoping I'd find this:

xen/arch/powerpc/memory.c:145

    xenheap_phys_end = xh_pages << PAGE_SHIFT;
    printk("End of Xen Area: %luMiB (%luKiB)\n",
           xenheap_phys_end >> 20, xenheap_phys_end >> 10);


which marks the end of the xen area; just what I was looking for.

Now I can do:

   /* overlap in pages into 2G-4G IO range (if any) */
   dom0_overlap = ((xenheap_phys_end >> PAGE_SHIFT) + dom0_nrpages) -
                  IO_SIZE_PAGES;


-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh@xxxxxxxxxx

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