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kqueue: replace kq_ncallouts loop with atomic_fetchadd

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This commit is contained in:
Mateusz Guzik 2021-06-02 15:14:58 +00:00
parent a19ae1b099
commit c9f8dcda85
1 changed files with 5 additions and 7 deletions
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12
sys/kern/kern_event.c
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@ -206,7 +206,7 @@ static struct filterops user_filtops = {
};
static uma_zone_t knote_zone;
static unsigned int kq_ncallouts = 0;
static unsigned int __exclusive_cache_line kq_ncallouts;
static unsigned int kq_calloutmax = 4 * 1024;
SYSCTL_UINT(_kern, OID_AUTO, kq_calloutmax, CTLFLAG_RW,
&kq_calloutmax, 0, "Maximum number of callouts allocated for kqueue");
@ -813,18 +813,16 @@ filt_timerattach(struct knote *kn)
{
struct kq_timer_cb_data *kc;
sbintime_t to;
unsigned int ncallouts;
int error;
error = filt_timervalidate(kn, &to);
if (error != 0)
return (error);
do {
ncallouts = kq_ncallouts;
if (ncallouts >= kq_calloutmax)
return (ENOMEM);
} while (!atomic_cmpset_int(&kq_ncallouts, ncallouts, ncallouts + 1));
if (atomic_fetchadd_int(&kq_ncallouts, 1) + 1 > kq_calloutmax) {
atomic_subtract_int(&kq_ncallouts, 1);
return (ENOMEM);
}
if ((kn->kn_sfflags & NOTE_ABSTIME) == 0)
kn->kn_flags |= EV_CLEAR; /* automatically set */