D35645.id108145.diff
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D35645.id108145.diff
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	Index: sys/kern/sched_4bsd.c
	===================================================================
	--- sys/kern/sched_4bsd.c
	+++ sys/kern/sched_4bsd.c
	@@ -703,6 +703,10 @@
	return (imax(1, (sched_slice * hz + realstathz / 2) / realstathz));
	}

	+SCHED_STAT_DEFINE(ithread_demotions, "Interrupt thread priority demotions");
	+SCHED_STAT_DEFINE(ithread_preemptions,
	+ "Interrupt thread preemptions due to time-sharing");
	+
	/*
	* We adjust the priority of the current process. The priority of a
	* process gets worse as it accumulates CPU time. The cpu usage
	@@ -739,7 +743,20 @@
	*/
	if (!TD_IS_IDLETHREAD(td) && --ts->ts_slice <= 0) {
	ts->ts_slice = sched_slice;
	- 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;
	}

	stat = DPCPU_PTR(idlestat);
	@@ -1134,6 +1151,15 @@
	td->td_slptick = 0;
	ts->ts_slptime = 0;
	ts->ts_slice = sched_slice;
	+
	+ /*
	+ * When resuming an idle ithread, restore its base ithread
	+ * priority.
	+ */
	+ if (PRI_BASE(td->td_pri_class) == PRI_ITHD &&
	+ td->td_base_pri != td->td_base_ithread_pri)
	+ sched_prio(td, td->td_base_ithread_pri);
	+
	sched_add(td, srqflags);
	}