Author: mav
Date: Sun Oct 31 11:44:41 2010
New Revision: 214597
URL: http://svn.freebsd.org/changeset/base/214597
Log:
Fix callout_tickstofirst() behavior after signed integer ticks overflow.
This should fix callout precision drop to 1/4s after 25 days of uptime
with HZ = 1000.
Submitted by: Taku YAMAMOTO <t...@tackymt.homeip.net>
Modified:
head/sys/kern/kern_timeout.c
Modified: head/sys/kern/kern_timeout.c
==============================================================================
--- head/sys/kern/kern_timeout.c Sun Oct 31 09:21:27 2010
(r214596)
+++ head/sys/kern/kern_timeout.c Sun Oct 31 11:44:41 2010
(r214597)
@@ -295,8 +295,7 @@ callout_tickstofirst(int limit)
sc = &cc->cc_callwheel[ (curticks+skip) & callwheelmask ];
/* search scanning ticks */
TAILQ_FOREACH( c, sc, c_links.tqe ){
- if (c && (c->c_time <= curticks + ncallout)
- && (c->c_time > 0))
+ if (c->c_time - curticks <= ncallout)
goto out;
}
skip++;
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