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Fix VIRTUAL and PROF interval timers for short intervals, broken at r247903.

Browse source 
Due to the way those timers are implemented, we can't handle very short
intervals.  In addition to that mentioned patch caused math overflows
for short intervals.  To avoid that round those intervals to 1 tick.

PR:		kern/187668
MFC after:	1 week
This commit is contained in:
Alexander Motin 2014-04-16 18:37:46 +00:00
parent 57a4f20b8d
commit d10a1df8d7
1 changed files with 8 additions and 0 deletions
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8
sys/kern/kern_time.c
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@ -774,6 +774,14 @@ kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv,
timevalsub(&oitv->it_value, &ctv);
}
} else {
if (aitv->it_interval.tv_sec == 0 &&
aitv->it_interval.tv_usec != 0 &&
aitv->it_interval.tv_usec < tick)
aitv->it_interval.tv_usec = tick;
if (aitv->it_value.tv_sec == 0 &&
aitv->it_value.tv_usec != 0 &&
aitv->it_value.tv_usec < tick)
aitv->it_value.tv_usec = tick;
PROC_SLOCK(p);
*oitv = p->p_stats->p_timer[which];
p->p_stats->p_timer[which] = *aitv;