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

Avi Kivity
2009-05-07T15:47:49Z

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?

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