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    SubjectRe: [PATCH v3 0/3] cpu: pseries: Cpu offline states framework
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    On Wed, 2009-09-16 at 20:58 +0530, Dipankar Sarma wrote:
    > On Tue, Sep 15, 2009 at 02:11:41PM +0200, Peter Zijlstra wrote:
    > > On Tue, 2009-09-15 at 17:36 +0530, Gautham R Shenoy wrote:
    > > > This patchset contains the offline state driver implemented for
    > > > pSeries. For pSeries, we define three available_hotplug_states. They are:
    > > >
    > > > online: The processor is online.
    > > >
    > > > offline: This is the the default behaviour when the cpu is offlined
    > > >
    > > > inactive: This cedes the vCPU to the hypervisor with a cede latency
    > > >
    > > > Any feedback on the patchset will be immensely valuable.
    > >
    > > I still think its a layering violation... its the hypervisor manager
    > > that should be bothered in what state an off-lined cpu is in.
    >
    > The problem is that all hypervisor managers cannot figure out what sort
    > of latency guest OS can tolerate under the situation. They wouldn't know
    > from what context guest OS has ceded the vcpu. It has to have
    > some sort of hint, which is what the guest OS provides.

    I'm missing something here, hot-unplug is a slow path and should not
    ever be latency critical..?



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