svn commit: r217984 - stable/8/sys/kern

John Baldwin jhb at FreeBSD.org
Thu Jan 27 21:32:50 UTC 2011


Author: jhb
Date: Thu Jan 27 21:32:50 2011
New Revision: 217984
URL: http://svn.freebsd.org/changeset/base/217984

Log:
  MFC 217237,217291:
  - Fix two harmless off-by-one errors.
  - Always use PRI_BASE() when checking the base type of a thread's priority
    class.

Modified:
  stable/8/sys/kern/sched_ule.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/kern/sched_ule.c
==============================================================================
--- stable/8/sys/kern/sched_ule.c	Thu Jan 27 21:27:49 2011	(r217983)
+++ stable/8/sys/kern/sched_ule.c	Thu Jan 27 21:32:50 2011	(r217984)
@@ -153,7 +153,7 @@ static struct td_sched td_sched0;
 #define	SCHED_PRI_NHALF		(SCHED_PRI_NRESV / 2)
 #define	SCHED_PRI_MIN		(PRI_MIN_TIMESHARE + SCHED_PRI_NHALF)
 #define	SCHED_PRI_MAX		(PRI_MAX_TIMESHARE - SCHED_PRI_NHALF)
-#define	SCHED_PRI_RANGE		(SCHED_PRI_MAX - SCHED_PRI_MIN)
+#define	SCHED_PRI_RANGE		(SCHED_PRI_MAX - SCHED_PRI_MIN + 1)
 #define	SCHED_PRI_TICKS(ts)						\
     (SCHED_TICK_HZ((ts)) /						\
     (roundup(SCHED_TICK_TOTAL((ts)), SCHED_PRI_RANGE) / SCHED_PRI_RANGE))
@@ -1391,7 +1391,7 @@ sched_priority(struct thread *td)
 	int score;
 	int pri;
 
-	if (td->td_pri_class != PRI_TIMESHARE)
+	if (PRI_BASE(td->td_pri_class) != PRI_TIMESHARE)
 		return;
 	/*
 	 * If the score is interactive we place the thread in the realtime
@@ -1409,8 +1409,8 @@ sched_priority(struct thread *td)
 	score = imax(0, sched_interact_score(td) + td->td_proc->p_nice);
 	if (score < sched_interact) {
 		pri = PRI_MIN_REALTIME;
-		pri += ((PRI_MAX_REALTIME - PRI_MIN_REALTIME) / sched_interact)
-		    * score;
+		pri += ((PRI_MAX_REALTIME - PRI_MIN_REALTIME + 1) /
+		    sched_interact) * score;
 		KASSERT(pri >= PRI_MIN_REALTIME && pri <= PRI_MAX_REALTIME,
 		    ("sched_priority: invalid interactive priority %d score %d",
 		    pri, score));
@@ -2142,7 +2142,7 @@ sched_clock(struct thread *td)
 	ts = td->td_sched;
 	if (td->td_pri_class & PRI_FIFO_BIT)
 		return;
-	if (td->td_pri_class == PRI_TIMESHARE) {
+	if (PRI_BASE(td->td_pri_class) == PRI_TIMESHARE) {
 		/*
 		 * We used a tick; charge it to the thread so
 		 * that we can compute our interactivity.


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