Messages in this thread | | | Date | Thu, 7 May 2009 07:46:37 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [KVM PATCH v4 2/2] kvm: add support for irqfd via eventfd-notification interface |
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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?
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?
- Davide
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