Rework realtime priority support:

- Move the realtime priority range up above kernel sleep priorities and
  just below interrupt thread priorities.
- Contract the interrupt and kernel sleep priority ranges a bit so that
  the timesharing priority band can be increased.  The new timeshare range
  is now slightly larger than the old realtime + timeshare ranges.
- Change the ULE scheduler to no longer use realtime priorities for
  interactive threads.  Instead, the larger timeshare range is now split
  into separate subranges for interactive and non-interactive ("batch")
  threads.  The end result is that interactive threads and non-interactive
  threads still use the same priority ranges as before, but realtime
  threads now have a separate, dedicated priority range.
- Do not modify the priority of non-timeshare threads in sched_sleep()
  or via cv_broadcastpri().  Realtime and idle priority threads will
  no longer have their priorities affected by sleeping in the kernel.

Reviewed by:	jeff

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/kern/subr_sleepqueue.c b/sys/kern/subr_sleepqueue.c
index cdf7a47..5d1ae86 100644
--- a/sys/kern/subr_sleepqueue.c
+++ b/sys/kern/subr_sleepqueue.c
@@ -745,7 +745,8 @@ sleepq_resume_thread(struct sleepqueue *sq, struct thread *td, int pri)
 
 	/* Adjust priority if requested. */
 	MPASS(pri == 0 || (pri >= PRI_MIN && pri <= PRI_MAX));
-	if (pri != 0 && td->td_priority > pri)
+	if (pri != 0 && td->td_priority > pri &&
+	    PRI_BASE(td->td_pri_class) == PRI_TIMESHARE)
 		sched_prio(td, pri);
 
 	/*