Re: [PATCH] fs: fcntl_setlease defies lease_init assumptions

[Martin J. Bligh]

Christoph Lameter wrote:
> On Mon, 8 May 2006, Pekka Enberg wrote:
>
>
> > > I think it sounds like it's worth it, but I'm not going to really push it.
> >
> > Sounds good to me. Andrew?
>
>
> virt_to_page is not cheap on NUMA.
>
> On IA64 virt_to_page is:
>
> #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
>
> # define pfn_to_page(pfn)       (vmem_map + (pfn))
>
> vmem_map is not a linear map but a virtual mapping that may require 
> several faults to get the information.

Can't you use sparsemem instead? It solves the same problem without the
magic faulting, doesn't it?

M.
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