Re: [PATCH 0/2] sparc64: Use low latency path to resume idle cpu

[Vijay Kumar]

On 7/20/2017 10:45 PM, David Miller wrote:
> From: Vijay Kumar <vijay.ac.kumar@xxxxxxxxxx>
> Date: Thu, 20 Jul 2017 22:36:42 -0500
>
> > I can give a try :). But looks to me one thing that will go wrong is
> > irq accounting done in __irq_enter() and rcu_irq_enter().
> Actually, the bigger problem is that scheduler_ipi() can raise a
> software interrupt, and nothing will invoke it.
Yes, I see your point.

> It's turning quite ugly to avoid the IRQ overhead, I must admit.
> So ignore this for now.
>
> In the longer term a probably cleaner way to do this is to have
> a special direct version of scheduler_ipi() that invokes all the
> necessary work, even the rebalance softirq, directly rather than
> indirectly.

Sure. Thanks.