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diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c
--- a/sys/kern/sched_ule.c
+++ b/sys/kern/sched_ule.c
@@ -2375,6 +2375,15 @@
sched_interact_update(td);
sched_pctcpu_update(ts, 0);
}
+
+ /*
+ * When resuming an idle ithread, restore its base ithread
+ * priority.
+ */
+ if (PRI_BASE(td->td_pri_class) == PRI_ITHD &&
+ td->td_priority != td->td_base_ithread_pri)
+ sched_prio(td, td->td_base_ithread_pri);
+
/*
* Reset the slice value since we slept and advanced the round-robin.
*/
@@ -2542,9 +2551,25 @@
thread_unlock(td);
}
+SCHED_STAT_DEFINE(ithread_demotions, "Interrupt thread priority demotions");
+SCHED_STAT_DEFINE(ithread_preemptions,
+ "Interrupt thread preemptions due to time-sharing");
+
+/*
+ * Return time slice for a given thread. For ithreads this is
+ * sched_slice. For other threads it is tdq_slice(tdq).
+ */
+static inline int
+td_slice(struct thread *td, struct tdq *tdq)
+{
+ if (PRI_BASE(td->td_pri_class) == PRI_ITHD)
+ return (sched_slice);
+ return (tdq_slice(tdq));
+}
+
/*
* Handle a stathz tick. This is really only relevant for timeshare
- * threads.
+ * and interrupt threads.
*/
void
sched_clock(struct thread *td, int cnt)
@@ -2602,9 +2627,22 @@
* time slice (default is 100ms).
*/
ts->ts_slice += cnt;
- if (ts->ts_slice >= tdq_slice(tdq)) {
+ if (ts->ts_slice >= td_slice(td, tdq)) {
ts->ts_slice = 0;
- td->td_flags |= TDF_NEEDRESCHED | TDF_SLICEEND;
+
+ /*
+ * If an ithread uses a full quantum, demote its
+ * priority and preempt it.
+ */
+ if (PRI_BASE(td->td_pri_class) == PRI_ITHD) {
+ SCHED_STAT_INC(ithread_preemptions);
+ td->td_owepreempt = 1;
+ if (td->td_base_pri + RQ_PPQ < PRI_MAX_ITHD) {
+ SCHED_STAT_INC(ithread_demotions);
+ sched_prio(td, td->td_base_pri + RQ_PPQ);
+ }
+ } else
+ td->td_flags |= TDF_NEEDRESCHED | TDF_SLICEEND;
}
}

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