Re: [RFC][PATCH] irq_work

Peter Zijlstra
2010-06-24T06:58:27Z

On Thu, 2010-06-24 at 14:50 +0800, Huang Ying wrote:
> On Thu, 2010-06-24 at 14:47 +0800, Peter Zijlstra wrote:
> > On Thu, 2010-06-24 at 14:43 +0800, Huang Ying wrote:
> > > Hi, Peter,
> >
> > > I fact I uses exactly the similar method in my patches, just trigger it
> > > with soft_irq instead of IRQ. Please take a look at
> > > nmi_return_notifier_schedule in
> >
> > But then why still use softirq? Once you have this its completely
> > useless.
>
> Some systems have no self interrupt, for example the system without
> APIC. We need to provide a fallback for them. soft_irq can help here.

So there's systems that don't have self-ipi but do have NMI context?

Can't we run the callbacks from the tick or something for such legacy
muck? I really don't like the whole softirq mess.