On Fri, 29 Jul 2016 13:17:42 -0700
John Baldwin <j...@freebsd.org> wrote:
> On Thursday, July 28, 2016 12:31:31 AM Gary Jennejohn wrote:
> > Well, now I know that ULE is a prerequiste for EARLY_AP_STARTUP! I
> > wasn't aware of that. I prefer BSD and that's the scheduler I did
> > the first tests with.
> >
> > But with the ULE scheduler the system comes up all the way.
> >
> > It would be nice if the BSD scheduler could also be modified to
> > work with EARLY_AP_STARTUP.
>
> I wasn't able to reproduce your hang with 4BSD, but I think I see a
> possible problem. Try this:
>
> diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c
> index 7de56b6..d53331a 100644
> --- a/sys/kern/sched_4bsd.c
> +++ b/sys/kern/sched_4bsd.c
> @@ -327,7 +327,6 @@ maybe_preempt(struct thread *td)
> * - The current thread has a higher (numerically lower) or
> * equivalent priority. Note that this prevents curthread from
> * trying to preempt to itself.
> - * - It is too early in the boot for context switches (cold is set).
> * - The current thread has an inhibitor set or is in the process of
> * exiting. In this case, the current thread is about to switch
> * out anyways, so there's no point in preempting. If we did,
> @@ -348,7 +347,7 @@ maybe_preempt(struct thread *td)
> ("maybe_preempt: trying to run inhibited thread"));
> pri = td->td_priority;
> cpri = ctd->td_priority;
> - if (panicstr != NULL || pri >= cpri || cold /* || dumping */ ||
> + if (panicstr != NULL || pri >= cpri /* || dumping */ ||
> TD_IS_INHIBITED(ctd))
> return (0);
> #ifndef FULL_PREEMPTION
> @@ -1127,7 +1126,7 @@ forward_wakeup(int cpunum)
> if ((!forward_wakeup_enabled) ||
> (forward_wakeup_use_mask == 0 && forward_wakeup_use_loop == 0))
> return (0);
> - if (!smp_started || cold || panicstr)
> + if (!smp_started || panicstr)
> return (0);
>
> forward_wakeups_requested++;
>
Thanks, but with this patch the kernel hangs in exactly the same
place as before - after the HPET output.
Maybe I'm missing some kernel option which ULE works around, or
something like that.
--
Gary Jennejohn
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