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    SubjectRe: [PATCH] [5/8] Fix logic error in 64bit memory hotadd
    Date
    On Tuesday 12 February 2008 11:35:22 Yasunori Goto wrote:
    > Hi Ingo-san.
    >
    > > > Does anyone even
    > > > use memory hotplug currently?
    > >
    > > I don't know.
    >
    > IBM's powerpc box can memory hot-add/remove by dynamic partitioning.
    > And our fujitsu server has memory hot-add feature (Ia-64).
    > So, they are concrete user of memory hotplug.
    >
    > In x86, E8500 chipset has the feature of memory-hotplug.
    > (I searched a data-sheet from intel site.)
    > http://download.intel.com/design/chipsets/e8500/datashts/30674501.pdf
    > (6.3.8 IMI Hot-Plug)
    >
    > So, it depends on how many server uses it, I think.

    With the logic pud error i found and that seems currently will stay
    for the forseeable future in the tree I don't think x86-64 64bit hotadds for more
    than 1GB have ever worked with the sparsemem method.

    Older trees (before 2.6.24) had also a different method that did
    preallocate everything based on the SRAT. That one should have worked
    for this case.

    -Andi


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