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fix workstealing > 1 and possible divide by 0

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This commit is contained in:
Charlie Root 2020-05-05 01:22:57 -04:00
parent 29df71b972
commit d535232e92
1 changed files with 16 additions and 12 deletions
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12
sys/kern/kern_event.c
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@ -1653,6 +1653,7 @@ kqueue_kevent(struct kqueue *kq, struct kevq *kevq, struct thread *td, int nchan
kevq->kevq_tot_time += cur_ts;
/* update average latency */
if (kevq->kevq_last_nkev > 0) {
avg = cur_ts / kevq->kevq_last_nkev;
CTR3(KTR_KQ, "kevent: td %d nkev %d kevent (avg) %ld ns", td->td_tid, kevq->kevq_last_nkev, avg);
if (kevq->kevq_avg_lat != 0) {
@ -1662,6 +1663,7 @@ kqueue_kevent(struct kqueue *kq, struct kevq *kevq, struct thread *td, int nchan
}
CTR3(KTR_KQ, "kevent: td %d nkev %d kevent (new avg) %ld ns", td->td_tid, kevq->kevq_last_nkev, kevq->kevq_avg_lat);
}
/* reset kevq->kevq_last_kev and nkev */
kevq->kevq_last_kev = KEVQ_LAST_KERN;
@ -2854,7 +2856,7 @@ kevq_worksteal(struct kevq *kevq)
{
struct kevq *other_kevq;
struct kqueue *kq;
struct knote *ws_kn;
struct knote *ws_kn, *next_kn;
//struct knlist *knl;
struct knote *ws_lst[8];
int ws_count;
@ -2888,7 +2890,7 @@ kevq_worksteal(struct kevq *kevq)
}
KVLST_RUNLOCK(kq);
//CTR2(KTR_KQ, "kevq_worksteal: kevq %p selected kevq %p", kevq, other_kevq);
CTR2(KTR_KQ, "kevq_worksteal: kevq %p selected kevq %p", kevq, other_kevq);
if (other_kevq != NULL) {
KEVQ_OWNED(other_kevq);
@ -2896,8 +2898,10 @@ kevq_worksteal(struct kevq *kevq)
ws_kn = kevq_peek_knote(other_kevq);
while((ws_count < tgt_count) && (ws_kn != NULL)) {
/* fast fail */
next_kn = TAILQ_NEXT(ws_kn, kn_tqe);
CTR2(KTR_KQ, "ws_kn = %p, next_kn = %p\n", ws_kn, next_kn);
if (!knote_stealable(ws_kn)) {
goto end_loop;
}
@ -2937,7 +2941,7 @@ kevq_worksteal(struct kevq *kevq)
// KN_LEAVE_FLUX_WAKEUP(ws_kn);
// }
end_loop:
ws_kn = TAILQ_NEXT(ws_kn, kn_tqe);
ws_kn = next_kn;
}
KEVQ_UNLOCK(other_kevq);