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SubjectRe: [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1
On Mon, Feb 27, 2012 at 09:38:01AM +0100, Peter Zijlstra wrote:
> On Fri, 2012-02-24 at 14:13 +0800, Yong Zhang wrote:
>
> > This remind me that we should have moved the irq_enter()/irq_exit() to
> > each arch's related irq handler.
> > see: http://marc.info/?l=linux-kernel&m=130709505700821&w=2
> >
> > So Peter, is there someone alread on it? or it still worth doing now?
>
> trouble was that some people didn't feel comfortable adding that
> overhead to plain resched IPIs that didn't need to do anything.

Any ideas on where the plain resched IPIs come from?

Thanks,
Yong

> So I
> more or less let it sit for a while.
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