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    SubjectRe: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline
    On Fri, Aug 07, 2020 at 08:58:09AM +0200, David Hildenbrand wrote:
    > On 07.08.20 06:32, Andrew Morton wrote:
    > > On Fri, 3 Jul 2020 18:28:23 +0530 Srikar Dronamraju <srikar@linux.vnet.ibm.com> wrote:
    > >
    > >>> The memory hotplug changes that somehow because you can hotremove numa
    > >>> nodes and therefore make the nodemask sparse but that is not a common
    > >>> case. I am not sure what would happen if a completely new node was added
    > >>> and its corresponding node was already used by the renumbered one
    > >>> though. It would likely conflate the two I am afraid. But I am not sure
    > >>> this is really possible with x86 and a lack of a bug report would
    > >>> suggest that nobody is doing that at least.
    > >>>
    > >>
    > >> JFYI,
    > >> Satheesh copied in this mailchain had opened a bug a year on crash with vcpu
    > >> hotplug on memoryless node.
    > >>
    > >> https://bugzilla.kernel.org/show_bug.cgi?id=202187
    > >
    > > So... do we merge this patch or not? Seems that the overall view is
    > > "risky but nobody is likely to do anything better any time soon"?
    >
    > I recall the issue Michal saw was "fix powerpc" vs. "break other
    > architectures". @Michal how should we proceed? At least x86-64 won't be
    > affected IIUC.
    There is a patch to introduce the node remapping on ppc as well which
    should eliminate the empty node 0.

    https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20200731111916.243569-1-aneesh.kumar@linux.ibm.com/

    Thanks

    Michal

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