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    SubjectRe: [PATCH v3 0/3] cpu: pseries: Cpu offline states framework
    On Tue 2009-09-15 14:11:41, 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
    > > even in the absense of this driver. The CPU would call make an
    > > rtas_stop_self() call and hand over the CPU back to the resource pool,
    > > thereby effectively deallocating that vCPU from the LPAR.
    > > NOTE: This would result in a configuration change to the LPAR
    > > which is visible to the outside world.
    > >
    > > inactive: This cedes the vCPU to the hypervisor with a cede latency
    > > specifier value 2.
    > > NOTE: This option does not result in a configuration change
    > > and the vCPU would be still entitled to the LPAR to which it earlier
    > > belong to.
    > >
    > > 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.

    Agreed. Proposed interface is ugly.

    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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