X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Ftrace-ust.c;h=7592d774177a43abb8782424084c711e371bcc5c;hp=5a8fc7dd988e300a70e6fd56b86b8a7bab6bae74;hb=36b588eddce05ef840bd247f6a58316925b9a0a2;hpb=a2c0da862b4c3286fa919b96556bc30e8914e28b

diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c
index 5a8fc7dd9..7592d7741 100644
--- a/src/bin/lttng-sessiond/trace-ust.c
+++ b/src/bin/lttng-sessiond/trace-ust.c
@@ -24,10 +24,101 @@
 #include <common/common.h>
 #include <common/defaults.h>
 
+#include "buffer-registry.h"
 #include "trace-ust.h"
 
 /*
- * Find the channel in the hashtable.
+ * Match function for the events hash table lookup.
+ *
+ * Matches by name only. Used by the disable command.
+ */
+int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
+		const void *_key)
+{
+	struct ltt_ust_event *event;
+	const char *name;
+
+	assert(node);
+	assert(_key);
+
+	event = caa_container_of(node, struct ltt_ust_event, node.node);
+	name = _key;
+
+	/* Event name */
+	if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
+		goto no_match;
+	}
+
+	/* Match */
+	return 1;
+
+no_match:
+	return 0;
+}
+
+/*
+ * Match function for the hash table lookup.
+ *
+ * It matches an ust event based on three attributes which are the event name,
+ * the filter bytecode and the loglevel.
+ */
+int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
+{
+	struct ltt_ust_event *event;
+	const struct ltt_ust_ht_key *key;
+
+	assert(node);
+	assert(_key);
+
+	event = caa_container_of(node, struct ltt_ust_event, node.node);
+	key = _key;
+
+	/* Match the 3 elements of the key: name, filter and loglevel. */
+
+	/* Event name */
+	if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
+		goto no_match;
+	}
+
+	/* Event loglevel. */
+	if (event->attr.loglevel != key->loglevel) {
+		if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
+				&& key->loglevel == 0 && event->attr.loglevel == -1) {
+			/*
+			 * Match is accepted. This is because on event creation, the
+			 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
+			 * -1 are accepted for this loglevel type since 0 is the one set by
+			 * the API when receiving an enable event.
+			 */
+		} else {
+			goto no_match;
+		}
+	}
+
+	/* Only one of the filters is NULL, fail. */
+	if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
+		goto no_match;
+	}
+
+	if (key->filter && event->filter) {
+		/* Both filters exists, check length followed by the bytecode. */
+		if (event->filter->len != key->filter->len ||
+				memcmp(event->filter->data, key->filter->data,
+					event->filter->len) != 0) {
+			goto no_match;
+		}
+	}
+
+	/* Match. */
+	return 1;
+
+no_match:
+	return 0;
+}
+
+/*
+ * Find the channel in the hashtable and return channel pointer. RCU read side
+ * lock MUST be acquired before calling this.
  */
 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
 		char *name)
@@ -35,14 +126,11 @@ struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
 	struct lttng_ht_node_str *node;
 	struct lttng_ht_iter iter;
 
-	rcu_read_lock();
 	lttng_ht_lookup(ht, (void *)name, &iter);
 	node = lttng_ht_iter_get_node_str(&iter);
 	if (node == NULL) {
-		rcu_read_unlock();
 		goto error;
 	}
-	rcu_read_unlock();
 
 	DBG2("Trace UST channel %s found by name", name);
 
@@ -54,29 +142,36 @@ error:
 }
 
 /*
- * Find the event in the hashtable.
+ * Find the event in the hashtable and return event pointer. RCU read side lock
+ * MUST be acquired before calling this.
  */
-struct ltt_ust_event *trace_ust_find_event_by_name(struct lttng_ht *ht,
-		char *name)
+struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
+		char *name, struct lttng_filter_bytecode *filter, int loglevel)
 {
 	struct lttng_ht_node_str *node;
 	struct lttng_ht_iter iter;
+	struct ltt_ust_ht_key key;
 
-	rcu_read_lock();
-	lttng_ht_lookup(ht, (void *) name, &iter);
+	assert(name);
+	assert(ht);
+
+	key.name = name;
+	key.filter = filter;
+	key.loglevel = loglevel;
+
+	cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
+			trace_ust_ht_match_event, &key, &iter.iter);
 	node = lttng_ht_iter_get_node_str(&iter);
 	if (node == NULL) {
-		rcu_read_unlock();
 		goto error;
 	}
-	rcu_read_unlock();
 
-	DBG2("Trace UST event found by name %s", name);
+	DBG2("Trace UST event %s found", key.name);
 
 	return caa_container_of(node, struct ltt_ust_event, node);
 
 error:
-	DBG2("Trace UST event NOT found by name %s", name);
+	DBG2("Trace UST event %s NOT found", key.name);
 	return NULL;
 }
 
@@ -85,10 +180,8 @@ error:
  *
  * Return pointer to structure or NULL.
  */
-struct ltt_ust_session *trace_ust_create_session(char *path, int session_id,
-		struct lttng_domain *domain)
+struct ltt_ust_session *trace_ust_create_session(unsigned int session_id)
 {
-	int ret;
 	struct ltt_ust_session *lus;
 
 	/* Allocate a new ltt ust session */
@@ -102,28 +195,40 @@ struct ltt_ust_session *trace_ust_create_session(char *path, int session_id,
 	lus->id = session_id;
 	lus->start_trace = 0;
 
-	/* Alloc UST domain hash tables */
-	lus->domain_pid = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
-	lus->domain_exec = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
+	/*
+	 * Default buffer type. This can be changed through an enable channel
+	 * requesting a different type. Note that this can only be changed once
+	 * during the session lifetime which is at the first enable channel and
+	 * only before start. The flag buffer_type_changed indicates the status.
+	 */
+	lus->buffer_type = LTTNG_BUFFER_PER_PID;
+	/* Once set to 1, the buffer_type is immutable for the session. */
+	lus->buffer_type_changed = 0;
+	/* Init it in case it get used after allocation. */
+	CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
 
 	/* Alloc UST global domain channels' HT */
 	lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
 
-	/* Set session path */
-	ret = snprintf(lus->pathname, PATH_MAX, "%s/ust", path);
-	if (ret < 0) {
-		PERROR("snprintf kernel traces path");
-		goto error_free_session;
+	lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
+	if (lus->consumer == NULL) {
+		goto error_consumer;
 	}
 
+	/*
+	 * The tmp_consumer stays NULL until a set_consumer_uri command is
+	 * executed. At this point, the consumer should be nullify until an
+	 * enable_consumer command. This assignment is symbolic since we've zmalloc
+	 * the struct.
+	 */
+	lus->tmp_consumer = NULL;
+
 	DBG2("UST trace session create successful");
 
 	return lus;
 
-error_free_session:
+error_consumer:
 	lttng_ht_destroy(lus->domain_global.channels);
-	lttng_ht_destroy(lus->domain_exec);
-	lttng_ht_destroy(lus->domain_pid);
 	free(lus);
 error:
 	return NULL;
@@ -134,12 +239,12 @@ error:
  *
  * Return pointer to structure or NULL.
  */
-struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
-		char *path)
+struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan)
 {
-	int ret;
 	struct ltt_ust_channel *luc;
 
+	assert(chan);
+
 	luc = zmalloc(sizeof(struct ltt_ust_channel));
 	if (luc == NULL) {
 		PERROR("ltt_ust_channel zmalloc");
@@ -152,7 +257,7 @@ struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
 	luc->attr.num_subbuf = chan->attr.num_subbuf;
 	luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
 	luc->attr.read_timer_interval = chan->attr.read_timer_interval;
-	luc->attr.output = chan->attr.output;
+	luc->attr.output = (enum lttng_ust_output) chan->attr.output;
 
 	/* Translate to UST output enum */
 	switch (luc->attr.output) {
@@ -171,23 +276,14 @@ struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
 	luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
 	luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 
-	/* Set trace output path */
-	ret = snprintf(luc->pathname, PATH_MAX, "%s", path);
-	if (ret < 0) {
-		PERROR("asprintf ust create channel");
-		goto error_free_channel;
-	}
+	/* On-disk circular buffer parameters */
+	luc->tracefile_size = chan->attr.tracefile_size;
+	luc->tracefile_count = chan->attr.tracefile_count;
 
 	DBG2("Trace UST channel %s created", luc->name);
 
-	return luc;
-
-error_free_channel:
-	lttng_ht_destroy(luc->ctx);
-	lttng_ht_destroy(luc->events);
-	free(luc);
 error:
-	return NULL;
+	return luc;
 }
 
 /*
@@ -195,10 +291,13 @@ error:
  *
  * Return pointer to structure or NULL.
  */
-struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
+struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
+		struct lttng_filter_bytecode *filter)
 {
 	struct ltt_ust_event *lue;
 
+	assert(ev);
+
 	lue = zmalloc(sizeof(struct ltt_ust_event));
 	if (lue == NULL) {
 		PERROR("ust event zmalloc");
@@ -245,11 +344,11 @@ struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
 		goto error_free_event;
 	}
 
+	/* Same layout. */
+	lue->filter = (struct lttng_ust_filter_bytecode *) filter;
 
 	/* Init node */
 	lttng_ht_node_init_str(&lue->node, lue->attr.name);
-	/* Alloc context hash tables */
-	lue->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 
 	DBG2("Trace UST event %s, loglevel (%d,%d) created",
 		lue->attr.name, lue->attr.loglevel_type,
@@ -258,7 +357,6 @@ struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
 	return lue;
 
 error_free_event:
-	lttng_ht_destroy(lue->ctx);
 	free(lue);
 error:
 	return NULL;
@@ -274,6 +372,8 @@ struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
 	int ret;
 	struct ltt_ust_metadata *lum;
 
+	assert(path);
+
 	lum = zmalloc(sizeof(struct ltt_ust_metadata));
 	if (lum == NULL) {
 		PERROR("ust metadata zmalloc");
@@ -282,15 +382,15 @@ struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
 
 	/* Set default attributes */
 	lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
-	lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
+	lum->attr.subbuf_size = default_get_metadata_subbuf_size();
 	lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
-	lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
-	lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
+	lum->attr.switch_timer_interval = DEFAULT_UST_CHANNEL_SWITCH_TIMER;
+	lum->attr.read_timer_interval = DEFAULT_UST_CHANNEL_READ_TIMER;
 	lum->attr.output = LTTNG_UST_MMAP;
 
 	lum->handle = -1;
 	/* Set metadata trace path */
-	ret = snprintf(lum->pathname, PATH_MAX, "%s/metadata", path);
+	ret = snprintf(lum->pathname, PATH_MAX, "%s/" DEFAULT_METADATA_NAME, path);
 	if (ret < 0) {
 		PERROR("asprintf ust metadata");
 		goto error_free_metadata;
@@ -315,6 +415,8 @@ struct ltt_ust_context *trace_ust_create_context(
 	struct ltt_ust_context *uctx;
 	enum lttng_ust_context_type utype;
 
+	assert(ctx);
+
 	switch (ctx->ctx) {
 	case LTTNG_EVENT_CONTEXT_VTID:
 		utype = LTTNG_UST_CONTEXT_VTID;
@@ -370,12 +472,16 @@ static void destroy_contexts(struct lttng_ht *ht)
 	struct lttng_ht_node_ulong *node;
 	struct lttng_ht_iter iter;
 
+	assert(ht);
+
+	rcu_read_lock();
 	cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
 		ret = lttng_ht_del(ht, &iter);
 		if (!ret) {
 			call_rcu(&node->head, destroy_context_rcu);
 		}
 	}
+	rcu_read_unlock();
 
 	lttng_ht_destroy(ht);
 }
@@ -385,9 +491,10 @@ static void destroy_contexts(struct lttng_ht *ht)
  */
 void trace_ust_destroy_event(struct ltt_ust_event *event)
 {
-	DBG2("Trace destroy UST event %s", event->attr.name);
-	destroy_contexts(event->ctx);
+	assert(event);
 
+	DBG2("Trace destroy UST event %s", event->attr.name);
+	free(event->filter);
 	free(event);
 }
 
@@ -413,23 +520,29 @@ static void destroy_events(struct lttng_ht *events)
 	struct lttng_ht_node_str *node;
 	struct lttng_ht_iter iter;
 
+	assert(events);
+
+	rcu_read_lock();
 	cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
 		ret = lttng_ht_del(events, &iter);
 		assert(!ret);
 		call_rcu(&node->head, destroy_event_rcu);
 	}
+	rcu_read_unlock();
 
 	lttng_ht_destroy(events);
 }
 
 /*
  * Cleanup ust channel structure.
+ *
+ * Should _NOT_ be called with RCU read lock held.
  */
-void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
+static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
 {
-	DBG2("Trace destroy UST channel %s", channel->name);
+	assert(channel);
 
-	rcu_read_lock();
+	DBG2("Trace destroy UST channel %s", channel->name);
 
 	/* Destroying all events of the channel */
 	destroy_events(channel->events);
@@ -437,8 +550,6 @@ void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
 	destroy_contexts(channel->ctx);
 
 	free(channel);
-
-	rcu_read_unlock();
 }
 
 /*
@@ -451,7 +562,12 @@ static void destroy_channel_rcu(struct rcu_head *head)
 	struct ltt_ust_channel *channel =
 		caa_container_of(node, struct ltt_ust_channel, node);
 
-	trace_ust_destroy_channel(channel);
+	_trace_ust_destroy_channel(channel);
+}
+
+void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
+{
+	call_rcu(&channel->node.head, destroy_channel_rcu);
 }
 
 /*
@@ -459,8 +575,12 @@ static void destroy_channel_rcu(struct rcu_head *head)
  */
 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
 {
-	DBG2("Trace UST destroy metadata %d", metadata->handle);
+	assert(metadata);
 
+	if (!metadata->handle) {
+		return;
+	}
+	DBG2("Trace UST destroy metadata %d", metadata->handle);
 	free(metadata);
 }
 
@@ -473,6 +593,8 @@ static void destroy_channels(struct lttng_ht *channels)
 	struct lttng_ht_node_str *node;
 	struct lttng_ht_iter iter;
 
+	assert(channels);
+
 	rcu_read_lock();
 
 	cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
@@ -480,46 +602,9 @@ static void destroy_channels(struct lttng_ht *channels)
 		assert(!ret);
 		call_rcu(&node->head, destroy_channel_rcu);
 	}
-
-	lttng_ht_destroy(channels);
-
 	rcu_read_unlock();
-}
 
-/*
- * Cleanup UST pid domain.
- */
-static void destroy_domain_pid(struct lttng_ht *ht)
-{
-	int ret;
-	struct lttng_ht_iter iter;
-	struct ltt_ust_domain_pid *dpid;
-
-	cds_lfht_for_each_entry(ht->ht, &iter.iter, dpid, node.node) {
-		ret = lttng_ht_del(ht , &iter);
-		assert(!ret);
-		destroy_channels(dpid->channels);
-	}
-
-	lttng_ht_destroy(ht);
-}
-
-/*
- * Cleanup UST exec name domain.
- */
-static void destroy_domain_exec(struct lttng_ht *ht)
-{
-	int ret;
-	struct lttng_ht_iter iter;
-	struct ltt_ust_domain_exec *dexec;
-
-	cds_lfht_for_each_entry(ht->ht, &iter.iter, dexec, node.node) {
-		ret = lttng_ht_del(ht , &iter);
-		assert(!ret);
-		destroy_channels(dexec->channels);
-	}
-
-	lttng_ht_destroy(ht);
+	lttng_ht_destroy(channels);
 }
 
 /*
@@ -527,29 +612,37 @@ static void destroy_domain_exec(struct lttng_ht *ht)
  */
 static void destroy_domain_global(struct ltt_ust_domain_global *dom)
 {
+	assert(dom);
+
 	destroy_channels(dom->channels);
 }
 
 /*
  * Cleanup ust session structure
+ *
+ * Should *NOT* be called with RCU read-side lock held.
  */
 void trace_ust_destroy_session(struct ltt_ust_session *session)
 {
-	/* Extra protection */
-	if (session == NULL) {
-		return;
-	}
+	struct buffer_reg_uid *reg, *sreg;
 
-	rcu_read_lock();
+	assert(session);
 
-	DBG2("Trace UST destroy session %d", session->id);
+	DBG2("Trace UST destroy session %u", session->id);
 
 	/* Cleaning up UST domain */
 	destroy_domain_global(&session->domain_global);
-	destroy_domain_pid(session->domain_pid);
-	destroy_domain_exec(session->domain_exec);
 
-	free(session);
+	/* Cleanup UID buffer registry object(s). */
+	cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
+			lnode) {
+		cds_list_del(&reg->lnode);
+		buffer_reg_uid_remove(reg);
+		buffer_reg_uid_destroy(reg, session->consumer);
+	}
 
-	rcu_read_unlock();
+	consumer_destroy_output(session->consumer);
+	consumer_destroy_output(session->tmp_consumer);
+
+	free(session);
 }