Re: [patch 13/13] signal/timer/event fds v9 - KAIO eventfd supportexample ...

[Avi Kivity]

Davide Libenzi wrote:
> On Sun, 1 Apr 2007, Avi Kivity wrote:
>
>   
> > What is the motivation for adding aio_resfd to an individual iocb instead of
> > the entire io context?  It seems redundant, as you can already create multiple
> > io contexts to wait on.
> >     
>
> To add it to the context, you need to either change the context create API 
> (I think no-go here), or add a new syscall just to handle that.
> Doing it in the iocb gives finer grained setup, but can be more work for 
> the user that wants to use it for all the iocbs.
>   

I think it's a bit too fine grained, and a new system call 
(io_bindfd()?) would be easier to use.  In addition, you would move the 
eventfd_fget() out of the submission path.

For the users that want fine grained control, they can already call 
io_setup() multiple times and submit iocbs to different completion rings.

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

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