Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait ornmi

[Peter Zijlstra]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/