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    SubjectRe: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    On Tue, Aug 08, 2006 at 10:17:53AM +0200, Martin Schwidefsky wrote:
    > "vmalloc reserve first; allocate pages later" would be a really nice
    > feature. We could use this on s390 to implement the virtual mem_map
    > array spanning the whole 64 bit address range (with holes in it). To
    > make it perfect a "deallocate pages; keep vmalloc reserve" should be
    > added, then we could free parts of the mem_map array again on hot memory
    > remove.

    IA-64 already has some arch. specific code to allocate a sparse
    virtual memory map ... having generic code to do so would be
    nice, but I foresee some chicken&egg problems in getting enough
    of the vmalloc/vmap framework up & running before mem_map[] has
    been allocated.

    That and the hotplug memory folks don't like the virtual mem_map
    code and have spurned it in favour of SPARSE.

    -Tony
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