Subject: Re: "fast" syscalls?
To: Jason Thorpe <>
From: Garrett D'Amore <>
List: tech-kern
Date: 03/17/2006 12:19:57
Jason Thorpe wrote:
> 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

Yesterday there was discussion of using a blocking lwp to do it.  I may
investigate that.

Garrett D'Amore, Principal Software Engineer
Tadpole Computer / Computing Technologies Division,
General Dynamics C4 Systems
Phone: 951 325-2134  Fax: 951 325-2191