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SubjectRe: [KVM PATCH v4 2/2] kvm: add support for irqfd via eventfd-notification interface
Davide Libenzi wrote:
> On Thu, 7 May 2009, Avi Kivity 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?
> Since I received this one after your ACK on the capability of eventfd of
> triggering callbacks, I assume we're clear on this point, aren't we?

We are.

Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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