monitor: Turn monitor_qapi_event_state[] into a hash table
In preparation of finer grained throttling. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <1444921716-9511-6-git-send-email-armbru@redhat.com>
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monitor.c
55
monitor.c
@ -450,7 +450,7 @@ static MonitorQAPIEventConf monitor_qapi_event_conf[QAPI_EVENT_MAX] = {
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[QAPI_EVENT_VSERPORT_CHANGE] = { 1000 * SCALE_MS },
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[QAPI_EVENT_VSERPORT_CHANGE] = { 1000 * SCALE_MS },
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};
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};
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static MonitorQAPIEventState monitor_qapi_event_state[QAPI_EVENT_MAX];
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GHashTable *monitor_qapi_event_state;
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/*
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/*
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* Emits the event to every monitor instance, @event is only used for trace
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* Emits the event to every monitor instance, @event is only used for trace
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@ -468,6 +468,8 @@ static void monitor_qapi_event_emit(QAPIEvent event, QDict *qdict)
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}
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}
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}
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}
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static void monitor_qapi_event_handler(void *opaque);
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/*
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/*
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* Queue a new event for emission to Monitor instances,
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* Queue a new event for emission to Monitor instances,
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* applying any rate limiting if required.
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* applying any rate limiting if required.
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@ -480,7 +482,6 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp)
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assert(event < QAPI_EVENT_MAX);
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assert(event < QAPI_EVENT_MAX);
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evconf = &monitor_qapi_event_conf[event];
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evconf = &monitor_qapi_event_conf[event];
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evstate = &monitor_qapi_event_state[event];
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trace_monitor_protocol_event_queue(event, qdict, evconf->rate);
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trace_monitor_protocol_event_queue(event, qdict, evconf->rate);
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qemu_mutex_lock(&monitor_lock);
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qemu_mutex_lock(&monitor_lock);
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@ -489,7 +490,12 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp)
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/* Unthrottled event */
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/* Unthrottled event */
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monitor_qapi_event_emit(event, qdict);
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monitor_qapi_event_emit(event, qdict);
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} else {
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} else {
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if (timer_pending(evstate->timer)) {
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MonitorQAPIEventState key = { .event = event };
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evstate = g_hash_table_lookup(monitor_qapi_event_state, &key);
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assert(!evstate || timer_pending(evstate->timer));
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if (evstate) {
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/*
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/*
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* Timer is pending for (at least) evconf->rate ns after
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* Timer is pending for (at least) evconf->rate ns after
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* last send. Store event for sending when timer fires,
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* last send. Store event for sending when timer fires,
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@ -508,6 +514,14 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp)
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int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
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int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
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monitor_qapi_event_emit(event, qdict);
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monitor_qapi_event_emit(event, qdict);
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evstate = g_new(MonitorQAPIEventState, 1);
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evstate->event = event;
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evstate->qdict = NULL;
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evstate->timer = timer_new_ns(QEMU_CLOCK_REALTIME,
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monitor_qapi_event_handler,
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evstate);
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g_hash_table_add(monitor_qapi_event_state, evstate);
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timer_mod_ns(evstate->timer, now + evconf->rate);
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timer_mod_ns(evstate->timer, now + evconf->rate);
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}
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}
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}
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}
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@ -535,27 +549,34 @@ static void monitor_qapi_event_handler(void *opaque)
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QDECREF(evstate->qdict);
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QDECREF(evstate->qdict);
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evstate->qdict = NULL;
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evstate->qdict = NULL;
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timer_mod_ns(evstate->timer, now + evconf->rate);
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timer_mod_ns(evstate->timer, now + evconf->rate);
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} else {
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g_hash_table_remove(monitor_qapi_event_state, evstate);
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timer_free(evstate->timer);
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g_free(evstate);
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}
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}
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qemu_mutex_unlock(&monitor_lock);
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qemu_mutex_unlock(&monitor_lock);
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}
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}
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static unsigned int qapi_event_throttle_hash(const void *key)
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{
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const MonitorQAPIEventState *evstate = key;
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return evstate->event * 255;
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}
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static gboolean qapi_event_throttle_equal(const void *a, const void *b)
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{
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const MonitorQAPIEventState *eva = a;
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const MonitorQAPIEventState *evb = b;
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return eva->event == evb->event;
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}
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static void monitor_qapi_event_init(void)
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static void monitor_qapi_event_init(void)
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{
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{
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int i;
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monitor_qapi_event_state = g_hash_table_new(qapi_event_throttle_hash,
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MonitorQAPIEventState *evstate;
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qapi_event_throttle_equal);
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for (i = 0; i < QAPI_EVENT_MAX; i++) {
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if (monitor_qapi_event_conf[i].rate) {
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evstate = &monitor_qapi_event_state[i];
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evstate->event = i;
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evstate->qdict = NULL;
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evstate->timer = timer_new_ns(QEMU_CLOCK_REALTIME,
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monitor_qapi_event_handler,
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evstate);
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}
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}
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qmp_event_set_func_emit(monitor_qapi_event_queue);
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qmp_event_set_func_emit(monitor_qapi_event_queue);
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}
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}
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