Re: [KVM PATCH v4 2/2] kvm: add support for irqfd via eventfd-notificationinterface

[Avi Kivity]

Davide Libenzi wrote:
>   
> > What's your take on adding irq context safe callbacks to irqfd?
> >
> > To give some background here, we would like to use eventfd as a generic
> > connector between components, so the components do not know about each other.
> > So far eventfd successfully abstracts among components in the same process, in
> > different processes, and in the kernel.
> >
> > eventfd_signal() can be safely called from irq context, and will wake up a
> > waiting task.  But in some cases, if the consumer is in the kernel, it may be
> > able to consume the event from irq context, saving a context switch.
> >
> > So, will you consider patches adding this capability to eventfd?
> >     
>
> Maybe I got lost in the thread, but inside the kernel we have 
> callback-based wakeup since long time. This is what epoll uses, when 
> hooking into the file* f_op->poll() subsystem.
> Did you mean something else?
>   

Do you mean wait_queue_t::func?

--
error compiling committee.c: too many arguments to function

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