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    SubjectRe: [Xen-devel] [PATCH 10/27] xen: make sure swiotlb allocation isphysically contigious
    >>> Jeremy Fitzhardinge <jeremy@goop.org> 13.03.09 17:59 >>>
    > void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
    > {
    >- return alloc_bootmem_low_pages(size);
    >+ void *ret = alloc_bootmem_low_pages(size);
    >+
    >+ if (ret && xen_pv_domain())
    >+ xen_swiotlb_fixup(ret, size, nslabs);
    >+
    >+ return ret;
    > }

    While on native using alloc_bootmem_low_pages() is a requirement here,
    on Xen this should explicitly not be used, as we realized just a couple of
    days ago: The way the bootmem allocator works, running out of space
    below 4Gb is pretty easy on machines with lots of memory, and since the
    swiotlb is a requirement for Dom0, the risk of allocation failures must be
    kept as low as possible.

    Jan



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