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    SubjectRe: [PATCH] i386: single node SPARSEMEM fix


    --On Wednesday, September 07, 2005 11:27:54 -0700 Dave Hansen <haveblue@us.ibm.com> wrote:

    > On Wed, 2005-09-07 at 11:22 -0700, Martin J. Bligh wrote:
    >> CONFIG_NUMA was meant to (and did at one point) support both NUMA and flat
    >> machines. This is essential in order for the distros to support it - same
    >> will go for sparsemem.
    >
    > That's a different issue. The current code works if you boot a NUMA=y
    > SPARSEMEM=y machine with a single node. The current Kconfig options
    > also enforce that SPARSEMEM depends on NUMA on i386.
    >
    > Magnus would like to enable SPARSEMEM=y while CONFIG_NUMA=n. That
    > requires some Kconfig changes, as well as an extra memory present call.
    > I'm questioning why we need to do that when we could never do
    > DISCONTIG=y while NUMA=n on i386.

    Ah, OK - makes more sense. However, some machines do have large holes
    in e820 map setups - is not really critical, more of an efficiency
    thing.

    M.

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