Re: [PATCH] fs: fcntl_setlease defies lease_init assumptions

["Martin J. Bligh" <mbligh@mbligh.org>]

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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/