Re: Scheduler broken on VAX?

["Michael L. Hitch" <mhitch%lightning.msu.montana.edu@localhost>]

On Tue, 24 Feb 2009, Anders Magnusson wrote:

> > Excellent with such a short program to reproduce the problem.
> > Now someone just needs to spend some time figuring out what the problem is.
> Rescheduling on vax isn't difficult.  If the machine finds out at a timer 
> interrupt that
> the current process should be preempted, it sets the cpu-specific flag 
> ci_want_resched
> and posts an AST.  When the AST is received (in user space) a trap will occur 
> that
> calls userret(), checks for ci_want_resched and calls preempt().
>
> The code looks sane to me.

  I don't know what code you are looking at, but the code I am looking at
doesn't look sane.  There is no preempt() call anymore [it was removed 
from userret() back in October].  I'm now talking with matt about what 
needs to be done to fix this.

--
Michael L. Hitch                        mhitch%montana.edu@localhost
Computer Consultant
Information Technology Center
Montana State University        Bozeman, MT     USA