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Under DIAGNOSTIC, complain if a timeout(9) routine took more than 1msec.

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This commit is contained in:
Poul-Henning Kamp 2002-09-04 20:05:00 +00:00
parent c316aa2cec
commit b336df68d1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=102936
1 changed files with 23 additions and 4 deletions
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27
sys/kern/kern_timeout.c
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@ -129,10 +129,15 @@ kern_timeout_callwheel_init(void)
void
softclock(void *dummy)
{
register struct callout *c;
register struct callout_tailq *bucket;
register int curticks;
register int steps; /* #steps since we last allowed interrupts */
struct callout *c;
struct callout_tailq *bucket;
int curticks;
int steps; /* #steps since we last allowed interrupts */
#ifdef DIAGNOSTIC
struct bintime bt1, bt2;
struct timespec ts2;
static uint64_t maxdt = 18446744073709551LL; /* 1 msec */
#endif
#ifndef MAX_SOFTCLOCK_STEPS
#define MAX_SOFTCLOCK_STEPS 100 /* Maximum allowed value of steps. */
@ -184,7 +189,21 @@ softclock(void *dummy)
mtx_unlock_spin(&callout_lock);
if (!(c_flags & CALLOUT_MPSAFE))
mtx_lock(&Giant);
#ifdef DIAGNOSTIC
binuptime(&bt1);
#endif
c_func(c_arg);
#ifdef DIAGNOSTIC
binuptime(&bt2);
bintime_sub(&bt2, &bt1);
if (bt2.frac > maxdt) {
bintime2timespec(&bt2, &ts2);
printf(
"Expensive timeout(9) function: %p(%p) %d.%09d\n",
c_func, c_arg,
ts2.tv_sec, ts2.tv_nsec);
}
#endif
if (!(c_flags & CALLOUT_MPSAFE))
mtx_unlock(&Giant);
mtx_lock_spin(&callout_lock);