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    SubjectRe: [PATCH v3] mm: make expand_downwards symmetrical to expand_upwards
    On Thu, 2011-04-21 at 11:45 -0700, Dave Hansen wrote:
    > On Thu, 2011-04-21 at 13:33 -0500, Christoph Lameter wrote:
    > >
    > >
    > >
    > >
    > > Dave Hansen, Mel: Can you provide us with some help? (Its Easter and so
    > > the europeans may be off for awhile)
    > Yup, for sure. It's also interesting how much code ppc64 removed when
    > they did this:

    I looked at converting parisc to sparsemem and there's one problem that
    none of these cover. How do you set up bootmem? If I look at the
    examples, they all seem to have enough memory in the first range to
    allocate from, so there's no problem. On parisc, with discontigmem, we
    set up all of our ranges as bootmem (we can do this because we
    effectively have one node per range). Obviously, since sparsemem has a
    single bitmap for all of the bootmem, we can no longer allocate all of
    our memory to it (well, without exploding because some of our gaps are
    gigabytes big). How does everyone cope with this (do you search for
    your largest range and use that as bootmem or something)?



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