On Mar 17, 2006, at 10:30 AM, Garrett D'Amore wrote:

> This is almost exactly what I had in mind.  It is the ioctl that I
> wanted to optimize away.

I can think of a couple of ways to make it less expensive for the u- 
 >k notification... but I'll have to stew on it for a bit first...   
My brain is doing in the direction of a generic message queue  
description / notification API... If we had a generic subsystem, it  
would be reasonable to implement a generic "fast trap" for this on  
platforms that can do it.

Anyway, for now I would suggest "use an ioctl to get your stuff  
working", and then we can always speed it up later..

-- thorpej