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    SubjectRe: [PATCH 0/10] bulk cpu removal support
    On Thu, May 11, 2006 at 12:19:20PM -0500, Nathan Lynch wrote:
    > But offlining all the cpus in a node is already something that just
    > works. If the user is all that concerned about not thrashing the
    > tasks running on that node, they would have a workload manager that
    > migrates the tasks off the node before shooting down cpus. Similar
    > argument applies to interrupt affinity.
    > I really haven't seen a compelling argument for why this is needed,
    > just a bunch of handwaving so far, sorry.

    Hand waving? Dont think that was intensional though.. i think we are trying
    to address a real problem, if there is a reasonable alternate already
    that we are not aware of, no problemo...

    1. Regarding process migration, someone needs to make sure they run
    something like a taskset away from all the cpus that are planned to be
    removed upfront. This needs to be done on all processes on the system.

    [nick, is there an easier way to do this in today's sched infrastructure or

    2. For interrrupt migration, today when we take a cpu offline, we pick
    a random online cpu today. So if you have a cpu going offline, and the
    next logical cpu is also part of the same package, or node, we have
    no smarts today to keep migration away from those "to be offlined" cpus.

    If we have a solution to these already, or a simpler alternative, we are
    open to those... and iam getting help on large system validation.. it might
    not be easy right away, but its comming.


    Ashok Raj
    - Open Source Technology Center
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