svn commit: r315013 - stable/11/sys/kern
Mark Johnston
markj at FreeBSD.org
Fri Mar 10 18:53:45 UTC 2017
Author: markj
Date: Fri Mar 10 18:53:44 2017
New Revision: 315013
URL: https://svnweb.freebsd.org/changeset/base/315013
Log:
MFC r314625:
Fix a ticks comparison in sched_pctcpu_update().
Modified:
stable/11/sys/kern/sched_ule.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/kern/sched_ule.c
==============================================================================
--- stable/11/sys/kern/sched_ule.c Fri Mar 10 18:52:37 2017 (r315012)
+++ stable/11/sys/kern/sched_ule.c Fri Mar 10 18:53:44 2017 (r315013)
@@ -1662,7 +1662,11 @@ sched_pctcpu_update(struct td_sched *ts,
{
int t = ticks;
- if (t - ts->ts_ltick >= SCHED_TICK_TARG) {
+ /*
+ * The signed difference may be negative if the thread hasn't run for
+ * over half of the ticks rollover period.
+ */
+ if ((u_int)(t - ts->ts_ltick) >= SCHED_TICK_TARG) {
ts->ts_ticks = 0;
ts->ts_ftick = t - SCHED_TICK_TARG;
} else if (t - ts->ts_ftick >= SCHED_TICK_MAX) {
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