On Mar 9, 2007, at 12:42 PM, David Laight wrote:

> Presumably you really only want to do it when:
> 1) You aren't in a normal system call
> and
> 2) you've done a context switch
>
> If you can't check (1) then context switches happen less often than
> returns to userspace.

Good point, thanks.

-- thorpej