Author: jhb
Date: Fri Jan 13 20:25:56 2012
New Revision: 230084
URL: http://svn.freebsd.org/changeset/base/230084
Log:
MFC 228960:
Cap the priority calculated from the current thread's running tick count
at SCHED_PRI_RANGE to prevent overflows in the priority value. This can
happen due to irregularities with clock interrupts under certain
virtualization environments.
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 Fri Jan 13 20:25:38 2012
(r230083)
+++ stable/8/sys/kern/sched_ule.c Fri Jan 13 20:25:56 2012
(r230084)
@@ -1426,7 +1426,8 @@ sched_priority(struct thread *td)
} else {
pri = SCHED_PRI_MIN;
if (td->td_sched->ts_ticks)
- pri += SCHED_PRI_TICKS(td->td_sched);
+ pri += min(SCHED_PRI_TICKS(td->td_sched),
+ SCHED_PRI_RANGE);
pri += SCHED_PRI_NICE(td->td_proc->p_nice);
KASSERT(pri >= PRI_MIN_BATCH && pri <= PRI_MAX_BATCH,
("sched_priority: invalid priority %d: nice %d, "
_______________________________________________
svn-src-all@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
