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, 1 insertions, 1 deletions

diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c
index d88b230..f7025b0 100644
--- a/sys/kern/sched_4bsd.c
+++ b/sys/kern/sched_4bsd.c
@@ -908,7 +908,7 @@ sched_sleep(struct thread *td, int pri)
 	THREAD_LOCK_ASSERT(td, MA_OWNED);
 	td->td_slptick = ticks;
 	td->td_sched->ts_slptime = 0;
-	if (pri)
+	if (pri != 0 && PRI_BASE(td->td_pri_class) == PRI_TIMESHARE)
 		sched_prio(td, pri);
 	if (TD_IS_SUSPENDED(td) || pri >= PSOCK)
 		td->td_flags |= TDF_CANSWAP;