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[Qemu-devel] [RFC 2/3] monitor: throttle QAPI_EVENT_VSERPORT_CHANGE by "
From: |
marcandre . lureau |
Subject: |
[Qemu-devel] [RFC 2/3] monitor: throttle QAPI_EVENT_VSERPORT_CHANGE by "id" |
Date: |
Wed, 12 Aug 2015 21:46:02 +0200 |
From: Marc-André Lureau <address@hidden>
Use a hash table to lookup the pending event corresponding to the "id"
field. The hash table may grow without limit here, the following patch
will add some cleaning.
Signed-off-by: Marc-André Lureau <address@hidden>
---
monitor.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 78 insertions(+), 26 deletions(-)
diff --git a/monitor.c b/monitor.c
index 9c51ffa..7334ffb 100644
--- a/monitor.c
+++ b/monitor.c
@@ -462,10 +462,10 @@ static void monitor_qapi_event_emit(QAPIEvent event,
QObject *data)
}
static bool
-monitor_qapi_event_delay(MonitorQAPIEventState *evstate, QDict *data)
+monitor_qapi_event_pending_update(MonitorQAPIEventState *evstate,
+ MonitorQAPIEventPending *p, QDict *data)
{
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
- MonitorQAPIEventPending *p = evstate->data;
int64_t delta = now - p->last;
/* Rate limit of 0 indicates no throttling */
@@ -494,31 +494,13 @@ monitor_qapi_event_delay(MonitorQAPIEventState *evstate,
QDict *data)
return FALSE;
}
-/*
- * Queue a new event for emission to Monitor instances,
- * applying any rate limiting if required.
- */
-static void
-monitor_qapi_event_queue(QAPIEvent event, QDict *data, Error **errp)
-{
- MonitorQAPIEventState *evstate;
- assert(event < QAPI_EVENT_MAX);
- int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
-
- evstate = &(monitor_qapi_event_state[event]);
- trace_monitor_protocol_event_queue(event,
- data,
- evstate->rate,
- now);
- qemu_mutex_lock(&monitor_lock);
-
- if (!evstate->delay ||
- !evstate->delay(evstate, data)) {
- monitor_qapi_event_emit(event, QOBJECT(data));
- }
+static bool
+monitor_qapi_event_delay(MonitorQAPIEventState *evstate, QDict *data)
+{
+ MonitorQAPIEventPending *p = evstate->data;
- qemu_mutex_unlock(&monitor_lock);
+ return monitor_qapi_event_pending_update(evstate, p, data);
}
/*
@@ -558,6 +540,58 @@ monitor_qapi_event_pending_new(QAPIEvent event)
return p;
}
+static bool
+monitor_qapi_event_id_delay(MonitorQAPIEventState *evstate, QDict *data)
+{
+ GHashTable *ht = evstate->data;
+ QDict *s = qdict_get_qdict(data, "data");
+ const char *id = qdict_get_str(s, "id");
+ MonitorQAPIEventPending *p = g_hash_table_lookup(ht, id);
+ QAPIEvent event = evstate - monitor_qapi_event_state;
+
+ if (!p) {
+ p = monitor_qapi_event_pending_new(event);
+ g_hash_table_insert(ht, g_strdup(id), p);
+ }
+
+ return monitor_qapi_event_pending_update(evstate, p, data);
+}
+
+/*
+ * Queue a new event for emission to Monitor instances,
+ * applying any rate limiting if required.
+ */
+static void
+monitor_qapi_event_queue(QAPIEvent event, QDict *data, Error **errp)
+{
+ MonitorQAPIEventState *evstate;
+ assert(event < QAPI_EVENT_MAX);
+ int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+
+ evstate = &(monitor_qapi_event_state[event]);
+ trace_monitor_protocol_event_queue(event,
+ data,
+ evstate->rate,
+ now);
+
+ qemu_mutex_lock(&monitor_lock);
+
+ if (!evstate->delay ||
+ !evstate->delay(evstate, data)) {
+ monitor_qapi_event_emit(event, QOBJECT(data));
+ }
+
+ qemu_mutex_unlock(&monitor_lock);
+}
+
+static void
+monitor_qapi_event_pending_free(MonitorQAPIEventPending *p)
+{
+ timer_del(p->timer);
+ timer_free(p->timer);
+ g_free(p);
+}
+
/*
* @event: the event ID to be limited
* @rate: the rate limit in milliseconds
@@ -582,6 +616,24 @@ monitor_qapi_event_throttle(QAPIEvent event, int64_t rate)
evstate->data = monitor_qapi_event_pending_new(event);
}
+static void
+monitor_qapi_event_id_throttle(QAPIEvent event, int64_t rate)
+{
+ MonitorQAPIEventState *evstate;
+ assert(event < QAPI_EVENT_MAX);
+
+ evstate = &(monitor_qapi_event_state[event]);
+
+ trace_monitor_protocol_event_throttle(event, rate);
+ assert(rate * SCALE_MS <= INT64_MAX);
+ evstate->rate = rate * SCALE_MS;
+
+ evstate->delay = monitor_qapi_event_id_delay;
+ evstate->data =
+ g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
+ (GDestroyNotify)monitor_qapi_event_pending_free);
+}
+
static void monitor_qapi_event_init(void)
{
/* Limit guest-triggerable events to 1 per second */
@@ -590,7 +642,7 @@ static void monitor_qapi_event_init(void)
monitor_qapi_event_throttle(QAPI_EVENT_BALLOON_CHANGE, 1000);
monitor_qapi_event_throttle(QAPI_EVENT_QUORUM_REPORT_BAD, 1000);
monitor_qapi_event_throttle(QAPI_EVENT_QUORUM_FAILURE, 1000);
- monitor_qapi_event_throttle(QAPI_EVENT_VSERPORT_CHANGE, 1000);
+ monitor_qapi_event_id_throttle(QAPI_EVENT_VSERPORT_CHANGE, 1000);
qmp_event_set_func_emit(monitor_qapi_event_queue);
}
--
2.4.3