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Cap the priority calculated from the current thread's running tick count

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at SCHED_PRI_RANGE to prevent overflows in the priority value.  This can
happen due to irregularities with clock interrupts under certain
virtualization environments.

Tested by:	Larry Rosenman  ler lerctr org
MFC after:	2 weeks
This commit is contained in:
John Baldwin 2011-12-29 16:17:16 +00:00
parent 9de96e891c
commit 0c0d27d5dd
1 changed files with 2 additions and 1 deletions
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3
sys/kern/sched_ule.c
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@ -1434,7 +1434,8 @@ 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, "