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    SubjectRe: [RFC PATCH 0/3] Refcount Based Cpu Hotplug V3

    * Gautham R Shenoy <ego@in.ibm.com> wrote:

    > Hi,
    > This is Try #3 for the Refcount + Waitqueue based implementation
    > for cpu-hotplug locking. The earlier versions can be found at
    >
    > http://lkml.org/lkml/2007/10/24/36
    > and
    > http://lkml.org/lkml/2007/10/16/118.
    >
    > This version drops the patch 4 from the earlier series, which was
    > basically removing the CPU_DEAD and CPU_UP_CANCELLED event handling in
    > the workqueue subsystem. This was based on Oleg Nestertov's comments
    > since the problem which the patch was attempting to solve was more
    > complicated and needs to be looked into seperately.
    >
    > The patch series is against v2.6.24-rc2 and has survived
    > overnight kern_bench + cpu-offline-online tests on
    > - 8 way x86,
    > - 8 way x86_64,
    > - 128 way ppc64 boxes.
    >
    > The patch series has gone through many iterations and looks to have
    > matured in the process.
    >
    > Andrew, could you please consider it for the next -mm release if there
    > are no objections ?

    really nice stuff!

    Acked-by: Ingo Molnar <mingo@elte.hu>

    since this is in essence a regression fix, how about a v2.6.24 merge?
    CPU online/offline never worked really reliably and it's used by
    suspend/resume as wel.

    Ingo
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