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    SubjectRe: [2.6.20][PATCH] fix mempolicy error check on a system with memory-less-node
    Date
    On Wednesday 07 February 2007 11:37, KAMEZAWA Hiroyuki wrote:
    > On Wed, 7 Feb 2007 11:19:02 +0100
    > Andi Kleen <ak@suse.de> wrote:
    >
    > >
    > > > AFAIK, ia64 creates nodes just depends on SRAT's possible resource information.
    > > > Then, ia64 can create cpu-memory-less-node(node with no available resource.).
    > > > (*)I don't like this.
    > > >
    > > > If we don't allow memory-less-node, we may have to add several codes for cpu-hot-add.
    > > > cpus should be moved to nearby node at hotadd .
    > > > And node-hot-add have to care that cpus mustn't be added before memory, cpu-driven
    > > > node-hot-add will never occur. (ACPI's 'container' device spec can't guaranntee this.)
    > >
    > > You can also alias node numbers to solve this: just point multiple node numbers
    > > to the same pgdat. For a memory less node this would be a nearby one.
    > >
    > Hmm, interesting...the 'alias' means follwing ?

    Yes.

    > NODE_DATA(A) = pgdat_for_A
    > NODE_DATA(B) = pgdat_for_A // B is memory-less.
    > - NODE_DATA(B) is valid but B is not online.

    Well it is online because A is. For all practical purposes
    it is A, just under a different name.

    > ==
    > looks complicated..and we have to care /sys/devices/system/node handling.

    x86-64 used to do that when it still only did 1:1 cpu<->memory mappings.
    I don't remember any problems with it.

    -Andi

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