PERFORCE change 63396 for review

[Julian Elischer]

John Baldwin wrote:

>http://perforce.freebsd.org/chv.cgi?CH=63396
>
>Change 63396 by jhb at jhb_tibook on 2004/10/19 21:58:24
>
>	Update.
>
>Affected files ...
>
>.. //depot/projects/smpng/sys/notes#21 edit
>
>Differences ...
>
>==== //depot/projects/smpng/sys/notes#21 (text+ko) ====
>
>@@ -33,6 +33,10 @@
>   - Untested
> - Don't allow kthreads to get signalled and do bad things
>   - Untested
>+- Change amd64 to use [ls]fence instructions for memory barriers.
>+  - Untested (and no hardware, maybe peter can test)
>+- Turn off the ipiwakeups in 4BSD since the currently implementation can
>+  lead to IPI deadlocks
>

the implementation of IPIs or the implementation of IPIwakeup?

> - Add a kproc API that does what kthread does right now
> - Add a real kthread API that creates just another thread inside of a kproc
>   - Figure out what needs to be done to make a new kthread.. should each
>  
>