Re: [tip:timers/nohz] nohz: Move full nohz kick to its own IPI

[Frederic Weisbecker]

On Mon, May 05, 2014 at 04:58:15PM +0200, Peter Zijlstra wrote:
> On Mon, May 05, 2014 at 04:52:59PM +0200, Frederic Weisbecker wrote:
> > > Should we instead do irq_work_queue_on() ?
> > 
> > I would really much prefer that yeah. But if we do that, expect some added overhead on the local
> > irq_work_queue() path though. irq_work_raise can't use local cmpxchg ops anymore.
> > 
> > Or we can have a different pending raise system for remote irq work.
> > 
> > I can try something.
> 
> Loosing that local cmpxchg shouldn't be a problem, I don't  thnk this is
> a particularly hot path.

Then the conversion is easy since most of the irq work code should
already work for remote queuing.

I'll come up with a patch soon.

Thanks.
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