X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=liblttng-ust%2Flttng-events.c;h=140e5caeea00cb27f5ddfc9df055ba5fc171ad50;hb=d0c8f180cac01b888a81ce8abb47ce9e57925a53;hp=d5fd9fee2f04b5636a4288e590a901ff8adf72d7;hpb=f0fde1c3984721c0660c7d5a1377db74b6c03a70;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-events.c b/liblttng-ust/lttng-events.c
index d5fd9fee..140e5cae 100644
--- a/liblttng-ust/lttng-events.c
+++ b/liblttng-ust/lttng-events.c
@@ -53,6 +53,7 @@
 #include "ust-events-internal.h"
 #include "wait.h"
 #include "../libringbuffer/shm.h"
+#include "../libringbuffer/frontend_types.h"
 #include "../libcounter/counter.h"
 #include "jhash.h"
 #include <lttng/ust-abi.h>
@@ -83,6 +84,22 @@ void lttng_event_notifier_group_sync_enablers(
 static
 void lttng_enabler_destroy(struct lttng_enabler *enabler);
 
+bool lttng_ust_validate_event_name(const struct lttng_ust_event_desc *desc)
+{
+	if (strlen(desc->probe_desc->provider_name) + 1 +
+			strlen(desc->event_name) >= LTTNG_UST_ABI_SYM_NAME_LEN)
+		return false;
+	return true;
+}
+
+void lttng_ust_format_event_name(const struct lttng_ust_event_desc *desc,
+		char *name)
+{
+	strcpy(name, desc->probe_desc->provider_name);
+	strcat(name, ":");
+	strcat(name, desc->event_name);
+}
+
 /*
  * Called with ust lock held.
  */
@@ -230,16 +247,18 @@ struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
  * Only used internally at session destruction.
  */
 static
-void _lttng_channel_unmap(struct lttng_channel *lttng_chan)
+void _lttng_channel_unmap(struct lttng_ust_channel_buffer *lttng_chan)
 {
 	struct lttng_ust_lib_ring_buffer_channel *chan;
 	struct lttng_ust_shm_handle *handle;
 
-	cds_list_del(&lttng_chan->node);
-	lttng_destroy_context(lttng_chan->ctx);
-	chan = lttng_chan->chan;
-	handle = lttng_chan->handle;
+	cds_list_del(&lttng_chan->priv->node);
+	lttng_destroy_context(lttng_chan->priv->ctx);
+	chan = lttng_chan->priv->rb_chan;
+	handle = chan->handle;
 	channel_destroy(chan, handle, 0);
+	free(lttng_chan->parent);
+	free(lttng_chan->priv);
 	free(lttng_chan);
 }
 
@@ -248,10 +267,12 @@ void register_event(struct lttng_ust_event_common *event)
 {
 	int ret;
 	struct lttng_ust_event_desc *desc;
+	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 
 	assert(event->priv->registered == 0);
 	desc = event->priv->desc;
-	ret = lttng_ust_tp_probe_register_queue_release(desc->name,
+	lttng_ust_format_event_name(desc, name);
+	ret = lttng_ust_tp_probe_register_queue_release(name,
 			desc->probe_callback,
 			event, desc->signature);
 	WARN_ON_ONCE(ret);
@@ -264,10 +285,12 @@ void unregister_event(struct lttng_ust_event_common *event)
 {
 	int ret;
 	struct lttng_ust_event_desc *desc;
+	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 
 	assert(event->priv->registered == 1);
 	desc = event->priv->desc;
-	ret = lttng_ust_tp_probe_unregister_queue_release(desc->name,
+	lttng_ust_format_event_name(desc, name);
+	ret = lttng_ust_tp_probe_unregister_queue_release(name,
 			desc->probe_callback,
 			event);
 	WARN_ON_ONCE(ret);
@@ -284,7 +307,7 @@ void _lttng_event_unregister(struct lttng_ust_event_common *event)
 
 void lttng_session_destroy(struct lttng_ust_session *session)
 {
-	struct lttng_channel *chan, *tmpchan;
+	struct lttng_ust_channel_buffer_private *chan, *tmpchan;
 	struct lttng_ust_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv;
 	struct lttng_enum *_enum, *tmp_enum;
 	struct lttng_event_enabler *event_enabler, *event_tmpenabler;
@@ -305,7 +328,7 @@ void lttng_session_destroy(struct lttng_ust_session *session)
 			&session->priv->enums_head, node)
 		_lttng_enum_destroy(_enum);
 	cds_list_for_each_entry_safe(chan, tmpchan, &session->priv->chan_head, node)
-		_lttng_channel_unmap(chan);
+		_lttng_channel_unmap(chan->pub);
 	cds_list_del(&session->priv->node);
 	lttng_destroy_context(session->priv->ctx);
 	free(session->priv);
@@ -544,7 +567,7 @@ int lttng_session_statedump(struct lttng_ust_session *session)
 int lttng_session_enable(struct lttng_ust_session *session)
 {
 	int ret = 0;
-	struct lttng_channel *chan;
+	struct lttng_ust_channel_buffer_private *chan;
 	int notify_socket;
 
 	if (session->active) {
@@ -589,7 +612,7 @@ int lttng_session_enable(struct lttng_ust_session *session)
 		ret = ustcomm_register_channel(notify_socket,
 			session,
 			session->priv->objd,
-			chan->objd,
+			chan->parent.objd,
 			nr_fields,
 			fields,
 			&chan_id,
@@ -634,36 +657,36 @@ end:
 	return ret;
 }
 
-int lttng_channel_enable(struct lttng_channel *channel)
+int lttng_channel_enable(struct lttng_ust_channel_common *lttng_channel)
 {
 	int ret = 0;
 
-	if (channel->enabled) {
+	if (lttng_channel->enabled) {
 		ret = -EBUSY;
 		goto end;
 	}
 	/* Set transient enabler state to "enabled" */
-	channel->tstate = 1;
-	lttng_session_sync_event_enablers(channel->session);
+	lttng_channel->priv->tstate = 1;
+	lttng_session_sync_event_enablers(lttng_channel->session);
 	/* Set atomically the state to "enabled" */
-	CMM_ACCESS_ONCE(channel->enabled) = 1;
+	CMM_ACCESS_ONCE(lttng_channel->enabled) = 1;
 end:
 	return ret;
 }
 
-int lttng_channel_disable(struct lttng_channel *channel)
+int lttng_channel_disable(struct lttng_ust_channel_common *lttng_channel)
 {
 	int ret = 0;
 
-	if (!channel->enabled) {
+	if (!lttng_channel->enabled) {
 		ret = -EBUSY;
 		goto end;
 	}
 	/* Set atomically the state to "disabled" */
-	CMM_ACCESS_ONCE(channel->enabled) = 0;
+	CMM_ACCESS_ONCE(lttng_channel->enabled) = 0;
 	/* Set transient enabler state to "enabled" */
-	channel->tstate = 0;
-	lttng_session_sync_event_enablers(channel->session);
+	lttng_channel->priv->tstate = 0;
+	lttng_session_sync_event_enablers(lttng_channel->session);
 end:
 	return ret;
 }
@@ -674,14 +697,14 @@ struct cds_hlist_head *borrow_hash_table_bucket(
 		unsigned int hash_table_size,
 		struct lttng_ust_event_desc *desc)
 {
-	const char *event_name;
+	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 	size_t name_len;
 	uint32_t hash;
 
-	event_name = desc->name;
-	name_len = strlen(event_name);
+	lttng_ust_format_event_name(desc, name);
+	name_len = strlen(name);
 
-	hash = jhash(event_name, name_len, 0);
+	hash = jhash(name, name_len, 0);
 	return &hash_table[hash & (hash_table_size - 1)];
 }
 
@@ -690,17 +713,18 @@ struct cds_hlist_head *borrow_hash_table_bucket(
  */
 static
 int lttng_event_recorder_create(struct lttng_ust_event_desc *desc,
-		struct lttng_channel *chan)
+		struct lttng_ust_channel_buffer *chan)
 {
+	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 	struct lttng_ust_event_recorder *event_recorder;
 	struct lttng_ust_event_recorder_private *event_recorder_priv;
-	struct lttng_ust_session *session = chan->session;
+	struct lttng_ust_session *session = chan->parent->session;
 	struct cds_hlist_head *head;
 	int ret = 0;
 	int notify_socket, loglevel;
 	const char *uri;
 
-	head = borrow_hash_table_bucket(chan->session->priv->events_ht.table,
+	head = borrow_hash_table_bucket(chan->parent->session->priv->events_ht.table,
 		LTTNG_UST_EVENT_HT_SIZE, desc);
 
 	notify_socket = lttng_get_notify_socket(session->priv->owner);
@@ -748,9 +772,10 @@ int lttng_event_recorder_create(struct lttng_ust_event_desc *desc,
 	event_recorder->chan = chan;
 
 	/* Event will be enabled by enabler sync. */
+	event_recorder->parent->run_filter = lttng_ust_interpret_event_filter;
 	event_recorder->parent->enabled = 0;
 	event_recorder->parent->priv->registered = 0;
-	CDS_INIT_LIST_HEAD(&event_recorder->parent->filter_bytecode_runtime_head);
+	CDS_INIT_LIST_HEAD(&event_recorder->parent->priv->filter_bytecode_runtime_head);
 	CDS_INIT_LIST_HEAD(&event_recorder->parent->priv->enablers_ref_head);
 	event_recorder->parent->priv->desc = desc;
 
@@ -763,12 +788,14 @@ int lttng_event_recorder_create(struct lttng_ust_event_desc *desc,
 	else
 		uri = NULL;
 
+	lttng_ust_format_event_name(desc, name);
+
 	/* Fetch event ID from sessiond */
 	ret = ustcomm_register_event(notify_socket,
 		session,
 		session->priv->objd,
-		chan->objd,
-		desc->name,
+		chan->priv->parent.objd,
+		name,
 		loglevel,
 		desc->signature,
 		desc->nr_fields,
@@ -780,7 +807,7 @@ int lttng_event_recorder_create(struct lttng_ust_event_desc *desc,
 		goto sessiond_register_error;
 	}
 
-	cds_list_add(&event_recorder_priv->node, &chan->session->priv->events_head);
+	cds_list_add(&event_recorder_priv->node, &chan->parent->session->priv->events_head);
 	cds_hlist_add_head(&event_recorder_priv->hlist, head);
 	return 0;
 
@@ -845,11 +872,12 @@ int lttng_event_notifier_create(struct lttng_ust_event_desc *desc,
 	event_notifier_priv->error_counter_index = error_counter_index;
 
 	/* Event notifier will be enabled by enabler sync. */
+	event_notifier->parent->run_filter = lttng_ust_interpret_event_filter;
 	event_notifier->parent->enabled = 0;
 	event_notifier_priv->parent.registered = 0;
 
-	CDS_INIT_LIST_HEAD(&event_notifier->parent->filter_bytecode_runtime_head);
-	CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head);
+	CDS_INIT_LIST_HEAD(&event_notifier->parent->priv->filter_bytecode_runtime_head);
+	CDS_INIT_LIST_HEAD(&event_notifier->priv->capture_bytecode_runtime_head);
 	CDS_INIT_LIST_HEAD(&event_notifier_priv->parent.enablers_ref_head);
 	event_notifier_priv->parent.desc = desc;
 	event_notifier->notification_send = lttng_event_notifier_notification_send;
@@ -872,12 +900,14 @@ static
 int lttng_desc_match_star_glob_enabler(struct lttng_ust_event_desc *desc,
 		struct lttng_enabler *enabler)
 {
+	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 	int loglevel = 0;
 	unsigned int has_loglevel = 0;
 
+	lttng_ust_format_event_name(desc, name);
 	assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB);
 	if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX,
-			desc->name, SIZE_MAX))
+			name, SIZE_MAX))
 		return 0;
 	if (desc->loglevel) {
 		loglevel = *(*desc->loglevel);
@@ -895,11 +925,13 @@ static
 int lttng_desc_match_event_enabler(struct lttng_ust_event_desc *desc,
 		struct lttng_enabler *enabler)
 {
+	char name[LTTNG_UST_ABI_SYM_NAME_LEN];
 	int loglevel = 0;
 	unsigned int has_loglevel = 0;
 
+	lttng_ust_format_event_name(desc, name);
 	assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT);
-	if (strcmp(desc->name, enabler->event_param.name))
+	if (strcmp(name, enabler->event_param.name))
 		return 0;
 	if (desc->loglevel) {
 		loglevel = *(*desc->loglevel);
@@ -940,8 +972,14 @@ int lttng_desc_match_enabler(struct lttng_ust_event_desc *desc,
 				excluder_name = (char *) (excluder->excluder.names)
 						+ count * LTTNG_UST_ABI_SYM_NAME_LEN;
 				len = strnlen(excluder_name, LTTNG_UST_ABI_SYM_NAME_LEN);
-				if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX))
-					return 0;
+				if (len > 0) {
+					char name[LTTNG_UST_ABI_SYM_NAME_LEN];
+
+					lttng_ust_format_event_name(desc, name);
+					if (strutils_star_glob_match(excluder_name, len, name, SIZE_MAX)) {
+						return 0;
+					}
+				}
 			}
 		}
 		return 1;
@@ -1001,7 +1039,7 @@ struct lttng_enabler_ref *lttng_enabler_ref(
 static
 void lttng_create_event_recorder_if_missing(struct lttng_event_enabler *event_enabler)
 {
-	struct lttng_ust_session *session = event_enabler->chan->session;
+	struct lttng_ust_session *session = event_enabler->chan->parent->session;
 	struct lttng_ust_probe_desc *probe_desc;
 	struct lttng_ust_event_desc *desc;
 	struct lttng_ust_event_recorder_private *event_recorder_priv;
@@ -1047,8 +1085,9 @@ void lttng_create_event_recorder_if_missing(struct lttng_event_enabler *event_en
 			ret = lttng_event_recorder_create(probe_desc->event_desc[i],
 					event_enabler->chan);
 			if (ret) {
-				DBG("Unable to create event %s, error %d\n",
-					probe_desc->event_desc[i]->name, ret);
+				DBG("Unable to create event \"%s:%s\", error %d\n",
+					probe_desc->provider_name,
+					probe_desc->event_desc[i]->event_name, ret);
 			}
 		}
 	}
@@ -1132,7 +1171,7 @@ void _event_enum_destroy(struct lttng_ust_event_common *event)
 	case LTTNG_UST_EVENT_TYPE_RECORDER:
 	{
 		struct lttng_ust_event_recorder *event_recorder = event->child;
-		struct lttng_ust_session *session = event_recorder->chan->session;
+		struct lttng_ust_session *session = event_recorder->chan->parent->session;
 		unsigned int i;
 
 		/* Destroy enums of the current event. */
@@ -1199,7 +1238,7 @@ void lttng_probe_provider_unregister_events(
 static
 int lttng_event_enabler_ref_event_recorders(struct lttng_event_enabler *event_enabler)
 {
-	struct lttng_ust_session *session = event_enabler->chan->session;
+	struct lttng_ust_session *session = event_enabler->chan->parent->session;
 	struct lttng_ust_event_recorder_private *event_recorder_priv;
 
 	if (!lttng_event_enabler_as_enabler(event_enabler)->enabled)
@@ -1236,7 +1275,7 @@ int lttng_event_enabler_ref_event_recorders(struct lttng_event_enabler *event_en
 		 */
 		lttng_enabler_link_bytecode(event_recorder_priv->parent.desc,
 			&session->priv->ctx,
-			&event_recorder_priv->pub->parent->filter_bytecode_runtime_head,
+			&event_recorder_priv->parent.filter_bytecode_runtime_head,
 			&lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
 
 		/* TODO: merge event context. */
@@ -1319,7 +1358,7 @@ void _lttng_event_destroy(struct lttng_ust_event_common *event)
 		/* Remove from event hash table. */
 		cds_hlist_del(&event_recorder->priv->hlist);
 
-		lttng_destroy_context(event_recorder->ctx);
+		lttng_destroy_context(event_recorder->priv->ctx);
 		free(event_recorder->parent);
 		free(event_recorder->priv);
 		free(event_recorder);
@@ -1366,7 +1405,7 @@ void lttng_ust_abi_events_exit(void)
 struct lttng_event_enabler *lttng_event_enabler_create(
 		enum lttng_enabler_format_type format_type,
 		struct lttng_ust_abi_event *event_param,
-		struct lttng_channel *chan)
+		struct lttng_ust_channel_buffer *chan)
 {
 	struct lttng_event_enabler *event_enabler;
 
@@ -1381,8 +1420,8 @@ struct lttng_event_enabler *lttng_event_enabler_create(
 	event_enabler->chan = chan;
 	/* ctx left NULL */
 	event_enabler->base.enabled = 0;
-	cds_list_add(&event_enabler->node, &event_enabler->chan->session->priv->enablers_head);
-	lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+	cds_list_add(&event_enabler->node, &event_enabler->chan->parent->session->priv->enablers_head);
+	lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session);
 
 	return event_enabler;
 }
@@ -1430,7 +1469,7 @@ struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
 {
 	lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
-	lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+	lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session);
 
 	return 0;
 }
@@ -1438,7 +1477,7 @@ int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
 {
 	lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
-	lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+	lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session);
 
 	return 0;
 }
@@ -1459,7 +1498,7 @@ int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event
 	_lttng_enabler_attach_filter_bytecode(
 		lttng_event_enabler_as_enabler(event_enabler), bytecode);
 
-	lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+	lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session);
 	return 0;
 }
 
@@ -1479,7 +1518,7 @@ int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabl
 	_lttng_enabler_attach_exclusion(
 		lttng_event_enabler_as_enabler(event_enabler), excluder);
 
-	lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+	lttng_session_lazy_sync_event_enablers(event_enabler->chan->parent->session);
 	return 0;
 }
 
@@ -1652,7 +1691,8 @@ void lttng_session_sync_event_enablers(struct lttng_ust_session *session)
 	cds_list_for_each_entry(event_recorder_priv, &session->priv->events_head, node) {
 		struct lttng_enabler_ref *enabler_ref;
 		struct lttng_ust_bytecode_runtime *runtime;
-		int enabled = 0, has_enablers_without_bytecode = 0;
+		int enabled = 0, has_enablers_without_filter_bytecode = 0;
+		int nr_filters = 0;
 
 		/* Enable events */
 		cds_list_for_each_entry(enabler_ref,
@@ -1667,7 +1707,7 @@ void lttng_session_sync_event_enablers(struct lttng_ust_session *session)
 		 * intesection of session and channel transient enable
 		 * states.
 		 */
-		enabled = enabled && session->priv->tstate && event_recorder_priv->pub->chan->tstate;
+		enabled = enabled && session->priv->tstate && event_recorder_priv->pub->chan->priv->parent.tstate;
 
 		CMM_STORE_SHARED(event_recorder_priv->pub->parent->enabled, enabled);
 		/*
@@ -1687,18 +1727,21 @@ void lttng_session_sync_event_enablers(struct lttng_ust_session *session)
 				&event_recorder_priv->parent.enablers_ref_head, node) {
 			if (enabler_ref->ref->enabled
 					&& cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) {
-				has_enablers_without_bytecode = 1;
+				has_enablers_without_filter_bytecode = 1;
 				break;
 			}
 		}
-		event_recorder_priv->pub->parent->has_enablers_without_bytecode =
-			has_enablers_without_bytecode;
+		event_recorder_priv->parent.has_enablers_without_filter_bytecode =
+			has_enablers_without_filter_bytecode;
 
 		/* Enable filters */
 		cds_list_for_each_entry(runtime,
-				&event_recorder_priv->pub->parent->filter_bytecode_runtime_head, node) {
-			lttng_bytecode_filter_sync_state(runtime);
+				&event_recorder_priv->parent.filter_bytecode_runtime_head, node) {
+			lttng_bytecode_sync_state(runtime);
+			nr_filters++;
 		}
+		CMM_STORE_SHARED(event_recorder_priv->parent.pub->eval_filter,
+			!(has_enablers_without_filter_bytecode || !nr_filters));
 	}
 	lttng_ust_tp_probe_prune_release_queue();
 }
@@ -1763,12 +1806,12 @@ void lttng_create_event_notifier_if_missing(
 
 			/* Check that the probe supports event notifiers, else report the error. */
 			if (!lttng_ust_probe_supports_event_notifier(probe_desc)) {
-				ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, "
+				ERR("Probe \"%s\" contains event \"%s:%s\" which matches an enabled event notifier, "
 					"but its version (%u.%u) is too old and does not implement event notifiers. "
 					"It needs to be recompiled against a newer version of LTTng-UST, otherwise "
 					"this event will not generate any notification.",
-					probe_desc->provider,
-					desc->name,
+					probe_desc->provider_name,
+					probe_desc->provider_name, desc->event_name,
 					probe_desc->major,
 					probe_desc->minor);
 				continue;
@@ -1781,8 +1824,9 @@ void lttng_create_event_notifier_if_missing(
 				event_notifier_enabler->error_counter_index,
 				event_notifier_group);
 			if (ret) {
-				DBG("Unable to create event_notifier %s, error %d\n",
-					probe_desc->event_desc[i]->name, ret);
+				DBG("Unable to create event_notifier \"%s:%s\", error %d\n",
+					probe_desc->provider_name,
+					probe_desc->event_desc[i]->event_name, ret);
 			}
 		}
 	}
@@ -1838,14 +1882,14 @@ int lttng_event_notifier_enabler_ref_event_notifiers(
 		 */
 		lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
 			&event_notifier_group->ctx,
-			&event_notifier_priv->pub->parent->filter_bytecode_runtime_head,
+			&event_notifier_priv->parent.filter_bytecode_runtime_head,
 			&lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
 
 		/*
 		 * Link capture bytecodes if not linked yet.
 		 */
 		lttng_enabler_link_bytecode(event_notifier_priv->parent.desc,
-			&event_notifier_group->ctx, &event_notifier_priv->pub->capture_bytecode_runtime_head,
+			&event_notifier_group->ctx, &event_notifier_priv->capture_bytecode_runtime_head,
 			&event_notifier_enabler->capture_bytecode_head);
 
 		event_notifier_priv->num_captures = event_notifier_enabler->num_captures;
@@ -1870,7 +1914,8 @@ void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
 	cds_list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) {
 		struct lttng_enabler_ref *enabler_ref;
 		struct lttng_ust_bytecode_runtime *runtime;
-		int enabled = 0, has_enablers_without_bytecode = 0;
+		int enabled = 0, has_enablers_without_filter_bytecode = 0;
+		int nr_filters = 0, nr_captures = 0;
 
 		/* Enable event_notifiers */
 		cds_list_for_each_entry(enabler_ref,
@@ -1899,24 +1944,30 @@ void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group
 				&event_notifier_priv->parent.enablers_ref_head, node) {
 			if (enabler_ref->ref->enabled
 					&& cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) {
-				has_enablers_without_bytecode = 1;
+				has_enablers_without_filter_bytecode = 1;
 				break;
 			}
 		}
-		event_notifier_priv->pub->parent->has_enablers_without_bytecode =
-			has_enablers_without_bytecode;
+		event_notifier_priv->parent.has_enablers_without_filter_bytecode =
+			has_enablers_without_filter_bytecode;
 
 		/* Enable filters */
 		cds_list_for_each_entry(runtime,
-				&event_notifier_priv->pub->parent->filter_bytecode_runtime_head, node) {
-			lttng_bytecode_filter_sync_state(runtime);
+				&event_notifier_priv->parent.filter_bytecode_runtime_head, node) {
+			lttng_bytecode_sync_state(runtime);
+			nr_filters++;
 		}
+		CMM_STORE_SHARED(event_notifier_priv->parent.pub->eval_filter,
+			!(has_enablers_without_filter_bytecode || !nr_filters));
 
 		/* Enable captures. */
 		cds_list_for_each_entry(runtime,
-				&event_notifier_priv->pub->capture_bytecode_runtime_head, node) {
-			lttng_bytecode_capture_sync_state(runtime);
+				&event_notifier_priv->capture_bytecode_runtime_head, node) {
+			lttng_bytecode_sync_state(runtime);
+			nr_captures++;
 		}
+		CMM_STORE_SHARED(event_notifier_priv->pub->eval_capture,
+				!!nr_captures);
 	}
 	lttng_ust_tp_probe_prune_release_queue();
 }
@@ -1947,14 +1998,14 @@ void lttng_ust_context_set_session_provider(const char *name,
 		size_t (*get_size)(struct lttng_ust_ctx_field *field, size_t offset),
 		void (*record)(struct lttng_ust_ctx_field *field,
 			struct lttng_ust_lib_ring_buffer_ctx *ctx,
-			struct lttng_channel *chan),
+			struct lttng_ust_channel_buffer *chan),
 		void (*get_value)(struct lttng_ust_ctx_field *field,
 			struct lttng_ust_ctx_value *value))
 {
 	struct lttng_ust_session_private *session_priv;
 
 	cds_list_for_each_entry(session_priv, &sessions, node) {
-		struct lttng_channel *chan;
+		struct lttng_ust_channel_buffer_private *chan;
 		struct lttng_ust_event_recorder_private *event_recorder_priv;
 		int ret;
 
@@ -1969,7 +2020,7 @@ void lttng_ust_context_set_session_provider(const char *name,
 				abort();
 		}
 		cds_list_for_each_entry(event_recorder_priv, &session_priv->events_head, node) {
-			ret = lttng_ust_context_set_provider_rcu(&event_recorder_priv->pub->ctx,
+			ret = lttng_ust_context_set_provider_rcu(&event_recorder_priv->ctx,
 					name, get_size, record, get_value);
 			if (ret)
 				abort();
@@ -1988,7 +2039,7 @@ void lttng_ust_context_set_event_notifier_group_provider(const char *name,
 		size_t (*get_size)(struct lttng_ust_ctx_field *field, size_t offset),
 		void (*record)(struct lttng_ust_ctx_field *field,
 			struct lttng_ust_lib_ring_buffer_ctx *ctx,
-			struct lttng_channel *chan),
+			struct lttng_ust_channel_buffer *chan),
 		void (*get_value)(struct lttng_ust_ctx_field *field,
 			struct lttng_ust_ctx_value *value))
 {
@@ -2004,3 +2055,21 @@ void lttng_ust_context_set_event_notifier_group_provider(const char *name,
 			abort();
 	}
 }
+
+int lttng_ust_session_uuid_validate(struct lttng_ust_session *session,
+		unsigned char *uuid)
+{
+	if (!session)
+		return 0;
+	/* Compare UUID with session. */
+	if (session->priv->uuid_set) {
+		if (memcmp(session->priv->uuid, uuid, LTTNG_UST_UUID_LEN)) {
+			return -1;
+		}
+	} else {
+		memcpy(session->priv->uuid, uuid, LTTNG_UST_UUID_LEN);
+		session->priv->uuid_set = true;
+	}
+	return 0;
+
+}