Re: [XenPPC] [xenppc-unstable] [POWERPC][XEN] Allocate more memory than RMA for Dom0

[Hollis Blanchard <hollisb@xxxxxxxxxx>]

On Sun, 2006-08-27 at 20:20 +0000, Xen patchbot-xenppc-unstable wrote:
> @@ -155,13 +159,36 @@ int construct_dom0(struct domain *d,
>      /* By default DOM0 is allocated all available memory. */
>      d->max_pages = ~0U;
>  
> +    /* default is the max(1/16th of memory, CONFIG_MIN_DOM0_PAGES) */
>      if (dom0_nrpages == 0) {
> -        dom0_nrpages = 1UL << d->arch.rma_order;
> -    }
> +        dom0_nrpages = total_pages >> 4;
> +
> +        if (dom0_nrpages < CONFIG_MIN_DOM0_PAGES)
> +            dom0_nrpages = CONFIG_MIN_DOM0_PAGES;
> +    }
> +
> +    /* make sure we are at least as big as the RMA */
> +    if (dom0_nrpages < rma_nrpages)
> +        dom0_nrpages = rma_nrpages;
> +    else
> +        dom0_nrpages = allocate_extents(d, dom0_nrpages, rma_nrpages);
>  
>      d->tot_pages = dom0_nrpages;
>      ASSERT(d->tot_pages > 0); 

Note that dom0_nrpages here doesn't do anything other than confuse the
memory accounting (though we don't try to destroy dom0, so it doesn't
matter too much ATM).

In particular, we're assigning d->tot_pages without actually doing any
heap allocation.

-- 
Hollis Blanchard
IBM Linux Technology Center


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