Re: [KVM PATCH 3/4] eventfd: add generalized notifier interface

[Gregory Haskins]

Davide Libenzi wrote:
> On Thu, 18 Jun 2009, Gregory Haskins wrote:
>
>   
>> We currently open-code notification registration via the f_ops->poll()
>> method of the eventfd.  Lets abstract this into a notification API
>> extension of eventfd, while still using the wait-queue as the underlying
>> mechanism.  This will allow us to manage the notification mechanism
>> internal to eventfd without requiring the clients to change.  This also
>> gives us the opportunity to implement race-free release() callbacks,
>> which we do later in the series.
>>     
>
> Another attempt to push KVM stuff into eventfd.

Also, could you please detail how you expect someone to use the POLLHUP
release in a race free way without patches 3/4 + 4/4?  That is not a KVM
specific problem either, afaict.

-Greg

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