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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>
This commit is contained in:
Markus Armbruster 2015-10-15 17:08:34 +02:00
parent 8681dffa91
commit a24712af54
1 changed files with 38 additions and 17 deletions
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55
monitor.c
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@ -450,7 +450,7 @@ static MonitorQAPIEventConf monitor_qapi_event_conf[QAPI_EVENT_MAX] = {
[QAPI_EVENT_VSERPORT_CHANGE] = { 1000 * SCALE_MS },
};
static MonitorQAPIEventState monitor_qapi_event_state[QAPI_EVENT_MAX];
GHashTable *monitor_qapi_event_state;
/*
* Emits the event to every monitor instance, @event is only used for trace
@ -468,6 +468,8 @@ static void monitor_qapi_event_emit(QAPIEvent event, QDict *qdict)
}
}
static void monitor_qapi_event_handler(void *opaque);
/*
* Queue a new event for emission to Monitor instances,
* applying any rate limiting if required.
@ -480,7 +482,6 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp)
assert(event < QAPI_EVENT_MAX);
evconf = &monitor_qapi_event_conf[event];
evstate = &monitor_qapi_event_state[event];
trace_monitor_protocol_event_queue(event, qdict, evconf->rate);
qemu_mutex_lock(&monitor_lock);
@ -489,7 +490,12 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp)
/* Unthrottled event */
monitor_qapi_event_emit(event, qdict);
} else {
if (timer_pending(evstate->timer)) {
MonitorQAPIEventState key = { .event = event };
evstate = g_hash_table_lookup(monitor_qapi_event_state, &key);
assert(!evstate || timer_pending(evstate->timer));
if (evstate) {
/*
* Timer is pending for (at least) evconf->rate ns after
* last send. Store event for sending when timer fires,
@ -508,6 +514,14 @@ monitor_qapi_event_queue(QAPIEvent event, QDict *qdict, Error **errp)
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
monitor_qapi_event_emit(event, qdict);
evstate = g_new(MonitorQAPIEventState, 1);
evstate->event = event;
evstate->qdict = NULL;
evstate->timer = timer_new_ns(QEMU_CLOCK_REALTIME,
monitor_qapi_event_handler,
evstate);
g_hash_table_add(monitor_qapi_event_state, evstate);
timer_mod_ns(evstate->timer, now + evconf->rate);
}
}
@ -535,27 +549,34 @@ static void monitor_qapi_event_handler(void *opaque)
QDECREF(evstate->qdict);
evstate->qdict = NULL;
timer_mod_ns(evstate->timer, now + evconf->rate);
} else {
g_hash_table_remove(monitor_qapi_event_state, evstate);
timer_free(evstate->timer);
g_free(evstate);
}
qemu_mutex_unlock(&monitor_lock);
}
static unsigned int qapi_event_throttle_hash(const void *key)
{
const MonitorQAPIEventState *evstate = key;
return evstate->event * 255;
}
static gboolean qapi_event_throttle_equal(const void *a, const void *b)
{
const MonitorQAPIEventState *eva = a;
const MonitorQAPIEventState *evb = b;
return eva->event == evb->event;
}
static void monitor_qapi_event_init(void)
{
int i;
MonitorQAPIEventState *evstate;
for (i = 0; i < QAPI_EVENT_MAX; i++) {
if (monitor_qapi_event_conf[i].rate) {
evstate = &monitor_qapi_event_state[i];
evstate->event = i;
evstate->qdict = NULL;
evstate->timer = timer_new_ns(QEMU_CLOCK_REALTIME,
monitor_qapi_event_handler,
evstate);
}
}
monitor_qapi_event_state = g_hash_table_new(qapi_event_throttle_hash,
qapi_event_throttle_equal);
qmp_event_set_func_emit(monitor_qapi_event_queue);
}