X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=lttng-sessiond%2Fust-app.c;h=69164126beafbe15e276a7f694bc5dc2045cd7b9;hp=1afb6d199db7bbda66e52979742e93d2a33a4cb9;hb=ac3bd9c0d406b3230680d06ab189bcb95337b9cc;hpb=2f2215907a630529cfa2f85d3d143c889e4fc021

diff --git a/lttng-sessiond/ust-app.c b/lttng-sessiond/ust-app.c
index 1afb6d199..69164126b 100644
--- a/lttng-sessiond/ust-app.c
+++ b/lttng-sessiond/ust-app.c
@@ -35,17 +35,38 @@
 #include "ust-consumer.h"
 #include "ust-ctl.h"
 
+/*
+ * Delete ust context safely. RCU read lock must be held before calling
+ * this function.
+ */
+static
+void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
+{
+	if (ua_ctx->obj) {
+		ustctl_release_object(sock, ua_ctx->obj);
+		free(ua_ctx->obj);
+	}
+	free(ua_ctx);
+}
+
 /*
  * Delete ust app event safely. RCU read lock must be held before calling
  * this function.
  */
-static void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
+static
+void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
 {
-	/* TODO : remove context */
-	//struct ust_app_ctx *ltctx;
-	//cds_lfht_for_each_entry(lte->ctx, &iter, ltctx, node) {
-	//	delete_ust_app_ctx(sock, ltctx);
-	//}
+	int ret;
+	struct cds_lfht_iter iter;
+	struct ust_app_ctx *ua_ctx;
+
+	cds_lfht_for_each_entry(ua_event->ctx, &iter, ua_ctx, node) {
+		ret = hashtable_del(ua_event->ctx, &iter);
+		assert(!ret);
+		delete_ust_app_ctx(sock, ua_ctx);
+	}
+	ret = hashtable_destroy(ua_event->ctx);
+	assert(!ret);
 
 	if (ua_event->obj != NULL) {
 		ustctl_release_object(sock, ua_event->obj);
@@ -58,10 +79,13 @@ static void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
  * Delete ust app stream safely. RCU read lock must be held before calling
  * this function.
  */
-static void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
+static
+void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
 {
-	ustctl_release_object(sock, stream->obj);
-	free(stream->obj);
+	if (stream->obj) {
+		ustctl_release_object(sock, stream->obj);
+		free(stream->obj);
+	}
 	free(stream);
 }
 
@@ -69,64 +93,66 @@ static void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
  * Delete ust app channel safely. RCU read lock must be held before calling
  * this function.
  */
-static void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
+static
+void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
 {
 	int ret;
 	struct cds_lfht_iter iter;
 	struct ust_app_event *ua_event;
+	struct ust_app_ctx *ua_ctx;
 	struct ltt_ust_stream *stream, *stmp;
 
+	/* Wipe stream */
 	cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
 		cds_list_del(&stream->list);
 		delete_ust_app_stream(sock, stream);
 	}
 
-	/* TODO : remove channel context */
-	//cds_lfht_for_each_entry(ltc->ctx, &iter, ltctx, node) {
-	//	ret = hashtable_del(ltc->ctx, &iter);
-	//	assert(!ret);
-	//	delete_ust_app_ctx(sock, ltctx);
-	//}
-	//ret = hashtable_destroy(ltc->ctx);
+	/* Wipe context */
+	cds_lfht_for_each_entry(ua_chan->ctx, &iter, ua_ctx, node) {
+		ret = hashtable_del(ua_chan->ctx, &iter);
+		assert(!ret);
+		delete_ust_app_ctx(sock, ua_ctx);
+	}
+	ret = hashtable_destroy(ua_chan->ctx);
+	assert(!ret);
 
+	/* Wipe events */
 	cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
 		ret = hashtable_del(ua_chan->events, &iter);
 		assert(!ret);
 		delete_ust_app_event(sock, ua_event);
 	}
-
 	ret = hashtable_destroy(ua_chan->events);
-	if (ret < 0) {
-		ERR("UST app destroy session hashtable failed");
-		goto error;
-	}
+	assert(!ret);
 
 	if (ua_chan->obj != NULL) {
 		ustctl_release_object(sock, ua_chan->obj);
 		free(ua_chan->obj);
 	}
 	free(ua_chan);
-
-error:
-	return;
 }
 
 /*
  * Delete ust app session safely. RCU read lock must be held before calling
  * this function.
  */
-static void delete_ust_app_session(int sock,
-		struct ust_app_session *ua_sess)
+static
+void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
 {
 	int ret;
 	struct cds_lfht_iter iter;
 	struct ust_app_channel *ua_chan;
 
 	if (ua_sess->metadata) {
-		ustctl_release_object(sock, ua_sess->metadata->stream_obj);
-		free(ua_sess->metadata->stream_obj);
-		ustctl_release_object(sock, ua_sess->metadata->obj);
-		free(ua_sess->metadata->obj);
+		if (ua_sess->metadata->stream_obj) {
+			ustctl_release_object(sock, ua_sess->metadata->stream_obj);
+			free(ua_sess->metadata->stream_obj);
+		}
+		if (ua_sess->metadata->obj) {
+			ustctl_release_object(sock, ua_sess->metadata->obj);
+			free(ua_sess->metadata->obj);
+		}
 	}
 
 	cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
@@ -134,28 +160,23 @@ static void delete_ust_app_session(int sock,
 		assert(!ret);
 		delete_ust_app_channel(sock, ua_chan);
 	}
-
 	ret = hashtable_destroy(ua_sess->channels);
-	if (ret < 0) {
-		ERR("UST app destroy session hashtable failed");
-		goto error;
-	}
+	assert(!ret);
 
-error:
-	return;
+	free(ua_sess);
 }
 
 /*
  * Delete a traceable application structure from the global list. Never call
  * this function outside of a call_rcu call.
  */
-static void delete_ust_app(struct ust_app *app)
+static
+void delete_ust_app(struct ust_app *app)
 {
-	int ret;
+	int ret, sock;
 	struct cds_lfht_node *node;
 	struct cds_lfht_iter iter;
 	struct ust_app_session *ua_sess;
-	int sock;
 
 	rcu_read_lock();
 
@@ -183,17 +204,14 @@ static void delete_ust_app(struct ust_app *app)
 	sock = app->key.sock;
 	app->key.sock = -1;
 
+	/* Wipe sessions */
 	cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) {
 		ret = hashtable_del(app->sessions, &iter);
 		assert(!ret);
 		delete_ust_app_session(app->key.sock, ua_sess);
 	}
-
 	ret = hashtable_destroy(app->sessions);
-	if (ret < 0) {
-		ERR("UST app destroy session hashtable failed");
-		goto end;
-	}
+	assert(!ret);
 
 	/*
 	 * Wait until we have removed the key from the sock hash table
@@ -212,7 +230,8 @@ end:
 /*
  * URCU intermediate call to delete an UST app.
  */
-static void delete_ust_app_rcu(struct rcu_head *head)
+static
+void delete_ust_app_rcu(struct rcu_head *head)
 {
 	struct cds_lfht_node *node =
 		caa_container_of(head, struct cds_lfht_node, head);
@@ -222,11 +241,137 @@ static void delete_ust_app_rcu(struct rcu_head *head)
 	delete_ust_app(app);
 }
 
+/*
+ * Alloc new UST app session.
+ */
+static
+struct ust_app_session *alloc_ust_app_session(void)
+{
+	struct ust_app_session *ua_sess;
+
+	/* Init most of the default value by allocating and zeroing */
+	ua_sess = zmalloc(sizeof(struct ust_app_session));
+	if (ua_sess == NULL) {
+		PERROR("malloc");
+		goto error;
+	}
+
+	ua_sess->handle = -1;
+	ua_sess->channels = hashtable_new_str(0);
+
+	return ua_sess;
+
+error:
+	return NULL;
+}
+
+/*
+ * Alloc new UST app channel.
+ */
+static
+struct ust_app_channel *alloc_ust_app_channel(char *name,
+		struct lttng_ust_channel *attr)
+{
+	struct ust_app_channel *ua_chan;
+
+	/* Init most of the default value by allocating and zeroing */
+	ua_chan = zmalloc(sizeof(struct ust_app_channel));
+	if (ua_chan == NULL) {
+		PERROR("malloc");
+		goto error;
+	}
+
+	/* Setup channel name */
+	strncpy(ua_chan->name, name, sizeof(ua_chan->name));
+	ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
+
+	ua_chan->enabled = 1;
+	ua_chan->handle = -1;
+	ua_chan->ctx = hashtable_new(0);
+	ua_chan->events = hashtable_new_str(0);
+	hashtable_node_init(&ua_chan->node, (void *) ua_chan->name,
+			strlen(ua_chan->name));
+
+	CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
+
+	/* Copy attributes */
+	if (attr) {
+		memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
+	}
+
+	DBG3("UST app channel %s allocated", ua_chan->name);
+
+	return ua_chan;
+
+error:
+	return NULL;
+}
+
+/*
+ * Alloc new UST app event.
+ */
+static
+struct ust_app_event *alloc_ust_app_event(char *name,
+		struct lttng_ust_event *attr)
+{
+	struct ust_app_event *ua_event;
+
+	/* Init most of the default value by allocating and zeroing */
+	ua_event = zmalloc(sizeof(struct ust_app_event));
+	if (ua_event == NULL) {
+		PERROR("malloc");
+		goto error;
+	}
+
+	ua_event->enabled = 1;
+	strncpy(ua_event->name, name, sizeof(ua_event->name));
+	ua_event->name[sizeof(ua_event->name) - 1] = '\0';
+	ua_event->ctx = hashtable_new(0);
+	hashtable_node_init(&ua_event->node, (void *) ua_event->name,
+			strlen(ua_event->name));
+
+	/* Copy attributes */
+	if (attr) {
+		memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
+	}
+
+	DBG3("UST app event %s allocated", ua_event->name);
+
+	return ua_event;
+
+error:
+	return NULL;
+}
+
+/*
+ * Alloc new UST app context.
+ */
+static
+struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
+{
+	struct ust_app_ctx *ua_ctx;
+
+	ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
+	if (ua_ctx == NULL) {
+		goto error;
+	}
+
+	if (uctx) {
+		memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
+	}
+
+	DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
+
+error:
+	return ua_ctx;
+}
+
 /*
  * Find an ust_app using the sock and return it. RCU read side lock must be
  * held before calling this helper function.
  */
-static struct ust_app *find_app_by_sock(int sock)
+static
+struct ust_app *find_app_by_sock(int sock)
 {
 	struct cds_lfht_node *node;
 	struct ust_app_key *key;
@@ -253,6 +398,52 @@ error:
 	return NULL;
 }
 
+/*
+ * Create the channel context on the tracer.
+ */
+static
+int create_ust_channel_context(struct ust_app_channel *ua_chan,
+		struct ust_app_ctx *ua_ctx, struct ust_app *app)
+{
+	int ret;
+
+	ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
+			ua_chan->obj, &ua_ctx->obj);
+	if (ret < 0) {
+		goto error;
+	}
+
+	ua_ctx->handle = ua_ctx->obj->handle;
+
+	DBG2("UST app context added to channel %s successfully", ua_chan->name);
+
+error:
+	return ret;
+}
+
+/*
+ * Create the event context on the tracer.
+ */
+static
+int create_ust_event_context(struct ust_app_event *ua_event,
+		struct ust_app_ctx *ua_ctx, struct ust_app *app)
+{
+	int ret;
+
+	ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
+			ua_event->obj, &ua_ctx->obj);
+	if (ret < 0) {
+		goto error;
+	}
+
+	ua_ctx->handle = ua_ctx->obj->handle;
+
+	DBG2("UST app context added to event %s successfully", ua_event->name);
+
+error:
+	return ret;
+}
+
 /*
  * Disable the specified event on to UST tracer for the UST session.
  */
@@ -471,118 +662,31 @@ error:
 	return ret;
 }
 
-/*
- * Alloc new UST app session.
- */
-static struct ust_app_session *alloc_ust_app_session(void)
-{
-	struct ust_app_session *ua_sess;
-
-	/* Init most of the default value by allocating and zeroing */
-	ua_sess = zmalloc(sizeof(struct ust_app_session));
-	if (ua_sess == NULL) {
-		PERROR("malloc");
-		goto error;
-	}
-
-	ua_sess->handle = -1;
-	ua_sess->channels = hashtable_new_str(0);
-
-	return ua_sess;
-
-error:
-	return NULL;
-}
-
-/*
- * Alloc new UST app channel.
- */
-static struct ust_app_channel *alloc_ust_app_channel(char *name,
-		struct lttng_ust_channel *attr)
-{
-	struct ust_app_channel *ua_chan;
-
-	/* Init most of the default value by allocating and zeroing */
-	ua_chan = zmalloc(sizeof(struct ust_app_channel));
-	if (ua_chan == NULL) {
-		PERROR("malloc");
-		goto error;
-	}
-
-	/* Setup channel name */
-	strncpy(ua_chan->name, name, sizeof(ua_chan->name));
-	ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
-
-	ua_chan->enabled = 1;
-	ua_chan->handle = -1;
-	ua_chan->ctx = hashtable_new(0);
-	ua_chan->events = hashtable_new_str(0);
-	hashtable_node_init(&ua_chan->node, (void *) ua_chan->name,
-			strlen(ua_chan->name));
-
-	CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
-
-	/* Copy attributes */
-	if (attr) {
-		memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
-	}
-
-	DBG3("UST app channel %s allocated", ua_chan->name);
-
-	return ua_chan;
-
-error:
-	return NULL;
-}
-
-/*
- * Alloc new UST app event.
- */
-static struct ust_app_event *alloc_ust_app_event(char *name,
-		struct lttng_ust_event *attr)
-{
-	struct ust_app_event *ua_event;
-
-	/* Init most of the default value by allocating and zeroing */
-	ua_event = zmalloc(sizeof(struct ust_app_event));
-	if (ua_event == NULL) {
-		PERROR("malloc");
-		goto error;
-	}
-
-	ua_event->enabled = 1;
-	strncpy(ua_event->name, name, sizeof(ua_event->name));
-	ua_event->name[sizeof(ua_event->name) - 1] = '\0';
-	ua_event->ctx = hashtable_new(0);
-	hashtable_node_init(&ua_event->node, (void *) ua_event->name,
-			strlen(ua_event->name));
-
-	/* Copy attributes */
-	if (attr) {
-		memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
-	}
-
-	DBG3("UST app event %s allocated", ua_event->name);
-
-	return ua_event;
-
-error:
-	return NULL;
-}
-
 /*
  * Copy data between an UST app event and a LTT event.
  */
 static void shadow_copy_event(struct ust_app_event *ua_event,
 		struct ltt_ust_event *uevent)
 {
+	struct cds_lfht_iter iter;
+	struct ltt_ust_context *uctx;
+	struct ust_app_ctx *ua_ctx;
+
 	strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
 	ua_event->name[sizeof(ua_event->name) - 1] = '\0';
 
 	/* Copy event attributes */
 	memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
 
-	/* TODO: support copy context */
+	cds_lfht_for_each_entry(uevent->ctx, &iter, uctx, node) {
+		ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
+		if (ua_ctx == NULL) {
+			continue;
+		}
+		hashtable_node_init(&ua_ctx->node,
+				(void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+		hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
+	}
 }
 
 /*
@@ -594,7 +698,9 @@ static void shadow_copy_channel(struct ust_app_channel *ua_chan,
 	struct cds_lfht_iter iter;
 	struct cds_lfht_node *ua_event_node;
 	struct ltt_ust_event *uevent;
+	struct ltt_ust_context *uctx;
 	struct ust_app_event *ua_event;
+	struct ust_app_ctx *ua_ctx;
 
 	DBG2("Shadow copy of UST app channel %s", ua_chan->name);
 
@@ -603,7 +709,15 @@ static void shadow_copy_channel(struct ust_app_channel *ua_chan,
 	/* Copy event attributes */
 	memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
 
-	/* TODO: support copy context */
+	cds_lfht_for_each_entry(uchan->ctx, &iter, uctx, node) {
+		ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
+		if (ua_ctx == NULL) {
+			continue;
+		}
+		hashtable_node_init(&ua_ctx->node,
+				(void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+		hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
+	}
 
 	/* Copy all events from ltt ust channel to ust app channel */
 	cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
@@ -774,6 +888,90 @@ error:
 	return NULL;
 }
 
+/*
+ * Create a context for the channel on the tracer.
+ */
+static
+int create_ust_app_channel_context(struct ust_app_session *ua_sess,
+		struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
+		struct ust_app *app)
+{
+	int ret = 0;
+	struct cds_lfht_iter iter;
+	struct cds_lfht_node *node;
+	struct ust_app_ctx *ua_ctx;
+
+	DBG2("UST app adding context to channel %s", ua_chan->name);
+
+	node = hashtable_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx),
+			sizeof(void *), &iter);
+	if (node != NULL) {
+		ret = -EEXIST;
+		goto error;
+	}
+
+	ua_ctx = alloc_ust_app_ctx(uctx);
+	if (ua_ctx == NULL) {
+		/* malloc failed */
+		ret = -1;
+		goto error;
+	}
+
+	hashtable_node_init(&ua_ctx->node,
+			(void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+	hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
+
+	ret = create_ust_channel_context(ua_chan, ua_ctx, app);
+	if (ret < 0) {
+		goto error;
+	}
+
+error:
+	return ret;
+}
+
+/*
+ * Create an UST context and enable it for the event on the tracer.
+ */
+static
+int create_ust_app_event_context(struct ust_app_session *ua_sess,
+		struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
+		struct ust_app *app)
+{
+	int ret = 0;
+	struct cds_lfht_iter iter;
+	struct cds_lfht_node *node;
+	struct ust_app_ctx *ua_ctx;
+
+	DBG2("UST app adding context to event %s", ua_event->name);
+
+	node = hashtable_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx),
+			sizeof(void *), &iter);
+	if (node != NULL) {
+		ret = -EEXIST;
+		goto error;
+	}
+
+	ua_ctx = alloc_ust_app_ctx(uctx);
+	if (ua_ctx == NULL) {
+		/* malloc failed */
+		ret = -1;
+		goto error;
+	}
+
+	hashtable_node_init(&ua_ctx->node,
+			(void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
+	hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
+
+	ret = create_ust_event_context(ua_event, ua_ctx, app);
+	if (ret < 0) {
+		goto error;
+	}
+
+error:
+	return ret;
+}
+
 /*
  * Enable on the tracer side a ust app event for the session and channel.
  */
@@ -938,7 +1136,9 @@ int create_ust_app_event(struct ust_app_session *ua_sess,
 	/* Create it on the tracer side */
 	ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
 	if (ret < 0) {
+		rcu_read_lock();
 		delete_ust_app_event(app->key.sock, ua_event);
+		rcu_read_unlock();
 		goto error;
 	}
 
@@ -1172,6 +1372,8 @@ int ust_app_list_events(struct lttng_event **events)
 	rcu_read_lock();
 
 	cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+		struct lttng_ust_tracepoint_iter iter;
+
 		handle = ustctl_tracepoint_list(app->key.sock);
 		if (handle < 0) {
 			ERR("UST app list events getting handle failed for app pid %d",
@@ -1180,7 +1382,9 @@ int ust_app_list_events(struct lttng_event **events)
 		}
 
 		while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
-						tmp[count].name)) != -ENOENT) {
+						&iter)) != -ENOENT) {
+			memcpy(tmp[count].name, iter.name, LTTNG_UST_SYM_NAME_LEN);
+			/* TODO : get loglevel too */
 			if (count > nbmem) {
 				DBG2("Reallocating event list from %zu to %zu bytes", nbmem,
 						nbmem + UST_APP_EVENT_LIST_SIZE);
@@ -1953,3 +2157,99 @@ error:
 	rcu_read_unlock();
 	return;
 }
+
+/*
+ * Add context to a specific channel for global UST domain.
+ */
+int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
+		struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
+{
+	int ret = 0;
+	struct cds_lfht_node *ua_chan_node;
+	struct cds_lfht_iter iter, uiter;
+	struct ust_app_channel *ua_chan = NULL;
+	struct ust_app_session *ua_sess;
+	struct ust_app *app;
+
+	rcu_read_lock();
+
+	cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+		ua_sess = lookup_session_by_app(usess, app);
+		if (ua_sess == NULL) {
+			continue;
+		}
+
+		/* Lookup channel in the ust app session */
+		ua_chan_node = hashtable_lookup(ua_sess->channels,
+				(void *)uchan->name, strlen(uchan->name), &uiter);
+		if (ua_chan_node == NULL) {
+			continue;
+		}
+		ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
+				node);
+
+		ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
+		if (ret < 0) {
+			continue;
+		}
+	}
+
+	/* Add ltt UST context node to ltt UST channel */
+	hashtable_add_unique(uchan->ctx, &uctx->node);
+
+	rcu_read_unlock();
+	return ret;
+}
+
+/*
+ * Add context to a specific event in a channel for global UST domain.
+ */
+int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
+		struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
+		struct ltt_ust_context *uctx)
+{
+	int ret = 0;
+	struct cds_lfht_node *ua_chan_node, *ua_event_node;
+	struct cds_lfht_iter iter, uiter;
+	struct ust_app_session *ua_sess;
+	struct ust_app_event *ua_event;
+	struct ust_app_channel *ua_chan = NULL;
+	struct ust_app *app;
+
+	rcu_read_lock();
+
+	cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
+		ua_sess = lookup_session_by_app(usess, app);
+		if (ua_sess == NULL) {
+			continue;
+		}
+
+		/* Lookup channel in the ust app session */
+		ua_chan_node = hashtable_lookup(ua_sess->channels,
+				(void *)uchan->name, strlen(uchan->name), &uiter);
+		if (ua_chan_node == NULL) {
+			continue;
+		}
+		ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
+				node);
+
+		ua_event_node = hashtable_lookup(ua_chan->events,
+				(void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
+		if (ua_event_node == NULL) {
+			continue;
+		}
+		ua_event = caa_container_of(ua_event_node, struct ust_app_event,
+				node);
+
+		ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
+		if (ret < 0) {
+			continue;
+		}
+	}
+
+	/* Add ltt UST context node to ltt UST event */
+	hashtable_add_unique(uevent->ctx, &uctx->node);
+
+	rcu_read_unlock();
+	return ret;
+}