diff options
| -rw-r--r-- | sys/kern/kern_timeout.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/sys/kern/kern_timeout.c b/sys/kern/kern_timeout.c index f1c4b90..8878500 100644 --- a/sys/kern/kern_timeout.c +++ b/sys/kern/kern_timeout.c @@ -70,6 +70,9 @@ int callwheelsize, callwheelbits, callwheelmask; struct callout_tailq *callwheel; int softticks; /* Like ticks, but for softclock(). */ struct mtx callout_lock; +#ifdef DIAGNOSTIC +struct mtx callout_dont_sleep; +#endif static struct callout *nextsoftcheck; /* Next callout to be checked. */ @@ -120,6 +123,9 @@ kern_timeout_callwheel_init(void) TAILQ_INIT(&callwheel[i]); } mtx_init(&callout_lock, "callout", NULL, MTX_SPIN | MTX_RECURSE); +#ifdef DIAGNOSTIC + mtx_init(&callout_dont_sleep, "callout_dont_sleep", NULL, MTX_DEF); +#endif } /* @@ -148,6 +154,11 @@ softclock(void *dummy) int depth; int mpcalls; int gcalls; +#ifdef DIAGNOSTIC + struct bintime bt1, bt2; + struct timespec ts2; + static uint64_t maxdt = 36893488147419102LL; /* 2 msec */ +#endif #ifndef MAX_SOFTCLOCK_STEPS #define MAX_SOFTCLOCK_STEPS 100 /* Maximum allowed value of steps. */ @@ -207,7 +218,24 @@ softclock(void *dummy) } else { mpcalls++; } +#ifdef DIAGNOSTIC + binuptime(&bt1); + mtx_lock(&callout_dont_sleep); +#endif c_func(c_arg); +#ifdef DIAGNOSTIC + mtx_unlock(&callout_dont_sleep); + binuptime(&bt2); + bintime_sub(&bt2, &bt1); + if (bt2.frac > maxdt) { + maxdt = bt2.frac; + bintime2timespec(&bt2, &ts2); + printf( + "Expensive timeout(9) function: %p(%p) %ld.%09ld s\n", + c_func, c_arg, + (long)ts2.tv_sec, ts2.tv_nsec); + } +#endif if (!(c_flags & CALLOUT_MPSAFE)) mtx_unlock(&Giant); mtx_lock_spin(&callout_lock); |
