[Xen-ia64-devel] Re: Getting rid of Xen heap

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

Hi Keir.

I suppose it wouldn't very difficult. I'll try it and see what it goes.
But daemons live in details...

thanks


On Fri, Jan 16, 2009 at 03:58:09PM +0000, Keir Fraser wrote:
> Hi Isaku, and other IA64 people,
> 
> In xen-unstable c/s 19054 I get rid of the statically-partitioned Xen heap
> for x86_64. Now the domain and Xen heaps are unified, and the Xen heap
> 'semantics' are a thin wrapper around the unified heap.
> 
> It would be nice to do the same for IA64 -- like x86/64 it has 1:1 mapping
> of all memory, so the static partitioning of Xen heap is not necessary. Also
> I can then make the statically-partitioned Xen heap a 32-bit x86 special
> case and push some of the code under arch/x86/x86_32 as is appropriate.
> 
> What do you think? If you look, I think you'll see it's not hard to do. You
> could keep using init_xenheap_pages() for now and really the hardest bit is
> getting rid of xenheap_phys_start/end variables and move over to a
> PGC_xen_heap page_info flag instead (needed since Xen heap pages have
> different deallocation semantics).
> 
> I suppose this might affect kdump since it won't dump Xen heap objects any
> more, but I didn't want to keep the tiny Xen heap partition only for that
> reason!
> 
>  -- Keir
> 
> 
> 

-- 
yamahata

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