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    SubjectRe: workqueue deadlock
    On Sun, Dec 10, 2006 at 03:18:38PM +0100, Rafael J. Wysocki wrote:
    > On Sunday, 10 December 2006 13:16, Andrew Morton wrote:
    > > On Sun, 10 Dec 2006 12:49:43 +0100
    >
    > Hm, currently we're using the CPU hotplug to disable the nonboot CPUs before
    > the freezer is called. ;-)
    >
    > However, we're now trying to make the freezer SMP-safe, so that we can disable
    > the nonboot CPUs after devices have been suspended (we want to do this for
    > some ACPI-related reasons). In fact we're almost there, I'm only waiting for
    > the confirmation from Pavel to post the patches.
    >
    > When this is done, we won't need the CPU hotplug that much and I think the CPU
    > hotplug code will be able to do something like:
    >
    > freeze_processes
    > suspend_cpufreq (or even suspend_all_devices)
    > remove_the_CPU_in_question
    > resume_cpufreq
    > thaw_processes

    Have you thought about how much time this might take on
    a machine with say - 128 CPUs of which I want to dynamically
    reconvigure 64 of them and make a new partition ? Assume
    10,000 tasks are running in the system.

    Thanks
    Dipankar
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