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From: dfilter@FreeBSD.ORG (dfilter service)
Subject: Re: kern/187668: commit references a PR
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The following reply was made to PR kern/187668; it has been noted by GNATS.

From: dfilter@FreeBSD.ORG (dfilter service)
To: bug-followup@FreeBSD.org
Cc:  
Subject: Re: kern/187668: commit references a PR
Date: Wed, 23 Apr 2014 12:46:31 +0000 (UTC)

 Author: mav
 Date: Wed Apr 23 12:46:27 2014
 New Revision: 264821
 URL: http://svnweb.freebsd.org/changeset/base/264821
 
 Log:
   MFC r264550:
   Fix VIRTUAL and PROF interval timers for short intervals, broken at r247903.
   
   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
 
 Modified:
   stable/10/sys/kern/kern_time.c
 Directory Properties:
   stable/10/   (props changed)
 
 Modified: stable/10/sys/kern/kern_time.c
 ==============================================================================
 --- stable/10/sys/kern/kern_time.c	Wed Apr 23 12:16:36 2014	(r264820)
 +++ stable/10/sys/kern/kern_time.c	Wed Apr 23 12:46:27 2014	(r264821)
 @@ -774,6 +774,14 @@ kern_setitimer(struct thread *td, u_int 
  				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;
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