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Add a sysctl (default: off) which enables a log(LOG_INFO...) warning

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if the clock is stepped.
This commit is contained in:
Poul-Henning Kamp 2004-01-21 21:05:40 +00:00
parent fb6b710c39
commit 4e74721cac
1 changed files with 19 additions and 10 deletions
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29
sys/kern/kern_tc.c
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@ -15,6 +15,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/systm.h>
#include <sys/timepps.h>
#include <sys/timetc.h>
@ -96,6 +97,10 @@ SYSCTL_STRUCT(_kern, KERN_BOOTTIME, boottime, CTLFLAG_RD,
SYSCTL_NODE(_kern, OID_AUTO, timecounter, CTLFLAG_RW, 0, "");
static int timestepwarnings;
SYSCTL_INT(_kern_timecounter, OID_AUTO, stepwarnings, CTLFLAG_RW,
&timestepwarnings, 0, "");
#define TC_STATS(foo) \
static u_int foo; \
SYSCTL_UINT(_kern_timecounter, OID_AUTO, foo, CTLFLAG_RD, &foo, 0, "");\
@ -334,26 +339,30 @@ tc_getfrequency(void)
/*
* Step our concept of UTC. This is done by modifying our estimate of
* when we booted. XXX: needs further work.
* when we booted.
* XXX: not locked.
*/
void
tc_setclock(struct timespec *ts)
{
struct timespec ts2;
struct bintime bt, bt2;
nsetclock++;
nanouptime(&ts2);
boottime.tv_sec = ts->tv_sec - ts2.tv_sec;
/* XXX boottime should probably be a timespec. */
boottime.tv_usec = (ts->tv_nsec - ts2.tv_nsec) / 1000;
if (boottime.tv_usec < 0) {
boottime.tv_usec += 1000000;
boottime.tv_sec--;
}
timeval2bintime(&boottime, &boottimebin);
binuptime(&bt2);
timespec2bintime(ts, &bt);
bintime_sub(&bt, &bt2);
bintime_add(&bt2, &boottimebin);
boottimebin = bt;
bintime2timeval(&bt, &boottime);
/* XXX fiddle all the little crinkly bits around the fiords... */
tc_windup();
if (timestepwarnings) {
bintime2timespec(&bt2, &ts2);
log(LOG_INFO, "Time stepped from %d.%09ld to %d.%09ld\n",
ts2.tv_sec, ts2.tv_nsec, ts->tv_sec, ts->tv_nsec);
}
}
/*