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SubjectRe: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi
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On Tue, 2012-06-05 at 12:51 -0700, Arjan van de Ven wrote:
> On 6/5/2012 12:49 PM, Peter Zijlstra wrote:
> > 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
> > cpus?
>
> ideally threaded interrupts are like this.. we really should push for
> more usage of such and it all falls into place

They are nothing like that.. threaded interrupts still have a hardirq
kick-off that's ran on whatever interrupt the interrupt routing picks.


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