Re: [Xen-devel] [PATCH]: Allow Xen to boot/run on large memory (>64G) machines

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 22/2/07 14:57, "Chris Lalancette" <clalance@xxxxxxxxxx> wrote:

>> It makes sense for the boot allocator to prefer to allocate from high memory
>> if it can, rather then using what is currently the DMA pool (and, after your
>> patches are applied, will be from relatively-narrow-address-width pools). So
>> I think this patch is good and narrow enough in scope to go straight in
>> (although I think the behaviour of alloc_boot_pages() should be changed
>> rather than adding a new allocator function).
> 
> Yeah, I wasn't quite sure how far to go with this.  The frame table was the
> worst offender, so I just went after that.  I can whip up a quick patch and
> test
> it out here, changing the alloc_boot_pages() to always allocate from the top.

Turns out there is one place that wants to allocate from the bottom (the
kdump path in arch/x86/setup.c). So I renamed alloc_boot_pages() to
alloc_lowmem_boot_pages() and called the new function alloc_boot_pages(). If
you care you use the more specific (lowmem) one. I'm about to check in the
revised patch.

> By the way, I assume we only want to do this for x86_64, yes?

No, it makes sense to conserve 'narrower' addresses.

 -- Keir


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