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    SubjectRE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi
    On Tue, 2012-06-05 at 21:43 +0200, Thomas Gleixner wrote:
    > Vs. the interrupt/timer/other crap madness:
    > - We really don't want to have an interrupt balancer in the kernel
    > again, but we need a mechanism to prevent the user space balancer
    > trainwreck from ruining the power saving party.

    What's wrong with having an interrupt balancer tied to the scheduler
    which optimistically tries to avoid interrupting nohz/isolated/idle

    > - The timer issue is mostly solved by the existing nohz stuff
    > (plus/minus the few bugs in there).

    Its not.. if you create an isolated domain there's no way to expel
    existing timers from there.

    > - The other details (silly IPIs) and cross CPU timer arming) are way
    > easier to solve by a proper prohibitive state than by chasing that
    > nonsense all over the tree forever.

    But we need to solve all that without a prohibitibe state anyway for the
    isolation stuff to be useful.

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      Last update: 2012-06-05 22:21    [W:2.286 / U:0.600 seconds]
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