/*
* Push metadata to consumer socket.
*
- * The socket lock MUST be acquired.
- * The ust app session lock MUST be acquired.
+ * RCU read-side lock must be held to guarantee existance of socket.
+ * Must be called with the ust app session lock held.
+ * Must be called with the registry lock held.
*
* On success, return the len of metadata pushed or else a negative value.
+ * Returning a -EPIPE return value means we could not send the metadata,
+ * but it can be caused by recoverable errors (e.g. the application has
+ * terminated concurrently).
*/
ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
struct consumer_socket *socket, int send_zero_data)
{
int ret;
char *metadata_str = NULL;
- size_t len, offset;
+ size_t len, offset, new_metadata_len_sent;
ssize_t ret_val;
+ uint64_t metadata_key;
assert(registry);
assert(socket);
- pthread_mutex_lock(®istry->lock);
+ metadata_key = registry->metadata_key;
/*
- * Means that no metadata was assigned to the session. This can happens if
- * no start has been done previously.
+ * Means that no metadata was assigned to the session. This can
+ * happens if no start has been done previously.
*/
- if (!registry->metadata_key) {
- pthread_mutex_unlock(®istry->lock);
+ if (!metadata_key) {
return 0;
}
/*
- * On a push metadata error either the consumer is dead or the metadata
- * channel has been destroyed because its endpoint might have died (e.g:
- * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
- * metadata again which is not valid anymore on the consumer side.
+ * On a push metadata error either the consumer is dead or the
+ * metadata channel has been destroyed because its endpoint
+ * might have died (e.g: relayd), or because the application has
+ * exited. If so, the metadata closed flag is set to 1 so we
+ * deny pushing metadata again which is not valid anymore on the
+ * consumer side.
*/
if (registry->metadata_closed) {
- pthread_mutex_unlock(®istry->lock);
return -EPIPE;
}
offset = registry->metadata_len_sent;
len = registry->metadata_len - registry->metadata_len_sent;
+ new_metadata_len_sent = registry->metadata_len;
if (len == 0) {
DBG3("No metadata to push for metadata key %" PRIu64,
registry->metadata_key);
ret_val = -ENOMEM;
goto error;
}
- /* Copy what we haven't send out. */
+ /* Copy what we haven't sent out. */
memcpy(metadata_str, registry->metadata + offset, len);
- registry->metadata_len_sent += len;
push_data:
pthread_mutex_unlock(®istry->lock);
- ret = consumer_push_metadata(socket, registry->metadata_key,
+ /*
+ * We need to unlock the registry while we push metadata to
+ * break a circular dependency between the consumerd metadata
+ * lock and the sessiond registry lock. Indeed, pushing metadata
+ * to the consumerd awaits that it gets pushed all the way to
+ * relayd, but doing so requires grabbing the metadata lock. If
+ * a concurrent metadata request is being performed by
+ * consumerd, this can try to grab the registry lock on the
+ * sessiond while holding the metadata lock on the consumer
+ * daemon. Those push and pull schemes are performed on two
+ * different bidirectionnal communication sockets.
+ */
+ ret = consumer_push_metadata(socket, metadata_key,
metadata_str, len, offset);
+ pthread_mutex_lock(®istry->lock);
if (ret < 0) {
/*
- * There is an acceptable race here between the registry metadata key
- * assignment and the creation on the consumer. The session daemon can
- * concurrently push metadata for this registry while being created on
- * the consumer since the metadata key of the registry is assigned
- * *before* it is setup to avoid the consumer to ask for metadata that
- * could possibly be not found in the session daemon.
+ * There is an acceptable race here between the registry
+ * metadata key assignment and the creation on the
+ * consumer. The session daemon can concurrently push
+ * metadata for this registry while being created on the
+ * consumer since the metadata key of the registry is
+ * assigned *before* it is setup to avoid the consumer
+ * to ask for metadata that could possibly be not found
+ * in the session daemon.
*
- * The metadata will get pushed either by the session being stopped or
- * the consumer requesting metadata if that race is triggered.
+ * The metadata will get pushed either by the session
+ * being stopped or the consumer requesting metadata if
+ * that race is triggered.
*/
if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) {
ret = 0;
+ } else {
+ ERR("Error pushing metadata to consumer");
}
-
- /* Update back the actual metadata len sent since it failed here. */
- pthread_mutex_lock(®istry->lock);
- registry->metadata_len_sent -= len;
- pthread_mutex_unlock(®istry->lock);
ret_val = ret;
goto error_push;
+ } else {
+ /*
+ * Metadata may have been concurrently pushed, since
+ * we're not holding the registry lock while pushing to
+ * consumer. This is handled by the fact that we send
+ * the metadata content, size, and the offset at which
+ * that metadata belongs. This may arrive out of order
+ * on the consumer side, and the consumer is able to
+ * deal with overlapping fragments. The consumer
+ * supports overlapping fragments, which must be
+ * contiguous starting from offset 0. We keep the
+ * largest metadata_len_sent value of the concurrent
+ * send.
+ */
+ registry->metadata_len_sent =
+ max_t(size_t, registry->metadata_len_sent,
+ new_metadata_len_sent);
}
-
free(metadata_str);
return len;
error:
if (ret_val) {
/*
- * On error, flag the registry that the metadata is closed. We were unable
- * to push anything and this means that either the consumer is not
- * responding or the metadata cache has been destroyed on the consumer.
+ * On error, flag the registry that the metadata is
+ * closed. We were unable to push anything and this
+ * means that either the consumer is not responding or
+ * the metadata cache has been destroyed on the
+ * consumer.
*/
registry->metadata_closed = 1;
}
- pthread_mutex_unlock(®istry->lock);
error_push:
free(metadata_str);
return ret_val;
* socket to send the metadata is retrieved from consumer, if sock
* is not NULL we use it to send the metadata.
* RCU read-side lock must be held while calling this function,
- * therefore ensuring existance of registry.
+ * therefore ensuring existance of registry. It also ensures existance
+ * of socket throughout this function.
*
* Return 0 on success else a negative error.
+ * Returning a -EPIPE return value means we could not send the metadata,
+ * but it can be caused by recoverable errors (e.g. the application has
+ * terminated concurrently).
*/
static int push_metadata(struct ust_registry_session *registry,
struct consumer_output *consumer)
assert(consumer);
pthread_mutex_lock(®istry->lock);
-
if (registry->metadata_closed) {
- pthread_mutex_unlock(®istry->lock);
- return -EPIPE;
+ ret_val = -EPIPE;
+ goto error;
}
/* Get consumer socket to use to push the metadata.*/
socket = consumer_find_socket_by_bitness(registry->bits_per_long,
consumer);
- pthread_mutex_unlock(®istry->lock);
if (!socket) {
ret_val = -1;
goto error;
}
- /*
- * TODO: Currently, we hold the socket lock around sampling of the next
- * metadata segment to ensure we send metadata over the consumer socket in
- * the correct order. This makes the registry lock nest inside the socket
- * lock.
- *
- * Please note that this is a temporary measure: we should move this lock
- * back into ust_consumer_push_metadata() when the consumer gets the
- * ability to reorder the metadata it receives.
- */
- pthread_mutex_lock(socket->lock);
ret = ust_app_push_metadata(registry, socket, 0);
- pthread_mutex_unlock(socket->lock);
if (ret < 0) {
ret_val = ret;
goto error;
}
-
+ pthread_mutex_unlock(®istry->lock);
return 0;
error:
-end:
+ pthread_mutex_unlock(®istry->lock);
return ret_val;
}
/*
* Send to the consumer a close metadata command for the given session. Once
* done, the metadata channel is deleted and the session metadata pointer is
- * nullified. The session lock MUST be acquired here unless the application is
+ * nullified. The session lock MUST be held unless the application is
* in the destroy path.
*
* Return 0 on success else a negative value.
pthread_mutex_lock(&ua_sess->lock);
+ assert(!ua_sess->deleted);
+ ua_sess->deleted = true;
+
registry = get_session_registry(ua_sess);
if (registry) {
/* Push metadata for application before freeing the application. */
}
pthread_mutex_unlock(&ua_sess->lock);
+ consumer_output_put(ua_sess->consumer);
+
call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu);
}
*
* Return allocated filter or NULL on error.
*/
-static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
- struct lttng_ust_filter_bytecode *orig_f)
+static struct lttng_filter_bytecode *copy_filter_bytecode(
+ struct lttng_filter_bytecode *orig_f)
{
- struct lttng_ust_filter_bytecode *filter = NULL;
+ struct lttng_filter_bytecode *filter = NULL;
/* Copy filter bytecode */
filter = zmalloc(sizeof(*filter) + orig_f->len);
if (!filter) {
- PERROR("zmalloc alloc ust app filter");
+ PERROR("zmalloc alloc filter bytecode");
goto error;
}
return filter;
}
+/*
+ * Create a liblttng-ust filter bytecode from given bytecode.
+ *
+ * Return allocated filter or NULL on error.
+ */
+static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode(
+ struct lttng_filter_bytecode *orig_f)
+{
+ struct lttng_ust_filter_bytecode *filter = NULL;
+
+ /* Copy filter bytecode */
+ filter = zmalloc(sizeof(*filter) + orig_f->len);
+ if (!filter) {
+ PERROR("zmalloc alloc ust filter bytecode");
+ goto error;
+ }
+
+ assert(sizeof(struct lttng_filter_bytecode) ==
+ sizeof(struct lttng_ust_filter_bytecode));
+ memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
+error:
+ return filter;
+}
+
/*
* Find an ust_app using the sock and return it. RCU read side lock must be
* held before calling this helper function.
* Return an ust_app_event object or NULL on error.
*/
static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
- char *name, struct lttng_ust_filter_bytecode *filter, int loglevel,
+ char *name, struct lttng_filter_bytecode *filter, int loglevel,
const struct lttng_event_exclusion *exclusion)
{
struct lttng_ht_iter iter;
key.filter = filter;
key.loglevel = loglevel;
/* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
- key.exclusion = (struct lttng_ust_event_exclusion *)exclusion;
+ key.exclusion = exclusion;
/* Lookup using the event name as hash and a custom match fct. */
cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
struct ust_app *app)
{
int ret;
+ struct lttng_ust_filter_bytecode *ust_bytecode = NULL;
health_code_update();
goto error;
}
- ret = ustctl_set_filter(app->sock, ua_event->filter,
+ ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter);
+ if (!ust_bytecode) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ ret = ustctl_set_filter(app->sock, ust_bytecode,
ua_event->obj);
if (ret < 0) {
if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
error:
health_code_update();
+ free(ust_bytecode);
return ret;
}
+static
+struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion(
+ struct lttng_event_exclusion *exclusion)
+{
+ struct lttng_ust_event_exclusion *ust_exclusion = NULL;
+ size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
+ LTTNG_UST_SYM_NAME_LEN * exclusion->count;
+
+ ust_exclusion = zmalloc(exclusion_alloc_size);
+ if (!ust_exclusion) {
+ PERROR("malloc");
+ goto end;
+ }
+
+ assert(sizeof(struct lttng_event_exclusion) ==
+ sizeof(struct lttng_ust_event_exclusion));
+ memcpy(ust_exclusion, exclusion, exclusion_alloc_size);
+end:
+ return ust_exclusion;
+}
+
/*
* Set event exclusions on the tracer.
*/
struct ust_app *app)
{
int ret;
+ struct lttng_ust_event_exclusion *ust_exclusion = NULL;
health_code_update();
goto error;
}
- ret = ustctl_set_exclusion(app->sock, ua_event->exclusion,
- ua_event->obj);
+ ust_exclusion = create_ust_exclusion_from_exclusion(
+ ua_event->exclusion);
+ if (!ust_exclusion) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto error;
+ }
+ ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj);
if (ret < 0) {
if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
ERR("UST app event %s exclusions failed for app (pid: %d) "
error:
health_code_update();
+ free(ust_exclusion);
return ret;
}
/* Send channel to the application. */
ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
- if (ret < 0) {
+ if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
+ ret = -ENOTCONN; /* Caused by app exiting. */
+ goto error;
+ } else if (ret < 0) {
goto error;
}
/* Send all streams to application. */
cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream);
- if (ret < 0) {
+ if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
+ ret = -ENOTCONN; /* Caused by app exiting. */
+ goto error;
+ } else if (ret < 0) {
goto error;
}
/* We don't need the stream anymore once sent to the tracer. */
/* Copy filter bytecode */
if (uevent->filter) {
- ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
+ ua_event->filter = copy_filter_bytecode(uevent->filter);
/* Filter might be NULL here in case of ENONEM. */
}
/* Copy exclusion data */
if (uevent->exclusion) {
- exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
+ exclusion_alloc_size = sizeof(struct lttng_event_exclusion) +
LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count;
ua_event->exclusion = zmalloc(exclusion_alloc_size);
if (ua_event->exclusion == NULL) {
struct tm *timeinfo;
char datetime[16];
int ret;
+ char tmp_shm_path[PATH_MAX];
/* Get date and time for unique app path */
time(&rawtime);
ua_sess->egid = usess->gid;
ua_sess->buffer_type = usess->buffer_type;
ua_sess->bits_per_long = app->bits_per_long;
+
/* There is only one consumer object per session possible. */
+ consumer_output_get(usess->consumer);
ua_sess->consumer = usess->consumer;
+
ua_sess->output_traces = usess->output_traces;
ua_sess->live_timer_interval = usess->live_timer_interval;
copy_channel_attr_to_ustctl(&ua_sess->metadata_attr,
goto error;
}
+ strncpy(ua_sess->root_shm_path, usess->root_shm_path,
+ sizeof(ua_sess->root_shm_path));
+ ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0';
+ strncpy(ua_sess->shm_path, usess->shm_path,
+ sizeof(ua_sess->shm_path));
+ ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0';
+ if (ua_sess->shm_path[0]) {
+ switch (ua_sess->buffer_type) {
+ case LTTNG_BUFFER_PER_PID:
+ ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path),
+ DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s",
+ app->name, app->pid, datetime);
+ break;
+ case LTTNG_BUFFER_PER_UID:
+ ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path),
+ DEFAULT_UST_TRACE_UID_PATH,
+ app->uid, app->bits_per_long);
+ break;
+ default:
+ assert(0);
+ goto error;
+ }
+ if (ret < 0) {
+ PERROR("sprintf UST shadow copy session");
+ assert(0);
+ goto error;
+ }
+ strncat(ua_sess->shm_path, tmp_shm_path,
+ sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1);
+ ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0';
+ }
+
/* Iterate over all channels in global domain. */
cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
uchan, node.node) {
lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
}
+ return;
error:
- return;
+ consumer_output_put(ua_sess->consumer);
}
/*
* This is the create channel path meaning that if there is NO
* registry available, we have to create one for this session.
*/
- ret = buffer_reg_pid_create(ua_sess->id, ®_pid);
+ ret = buffer_reg_pid_create(ua_sess->id, ®_pid,
+ ua_sess->root_shm_path, ua_sess->shm_path);
if (ret < 0) {
goto error;
}
app->uint16_t_alignment, app->uint32_t_alignment,
app->uint64_t_alignment, app->long_alignment,
app->byte_order, app->version.major,
- app->version.minor);
+ app->version.minor, reg_pid->root_shm_path,
+ reg_pid->shm_path,
+ ua_sess->euid, ua_sess->egid);
if (ret < 0) {
/*
* reg_pid->registry->reg.ust is NULL upon error, so we need to
* Return 0 on success or else a negative value.
*/
static int setup_buffer_reg_uid(struct ltt_ust_session *usess,
+ struct ust_app_session *ua_sess,
struct ust_app *app, struct buffer_reg_uid **regp)
{
int ret = 0;
* registry available, we have to create one for this session.
*/
ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid,
- LTTNG_DOMAIN_UST, ®_uid);
+ LTTNG_DOMAIN_UST, ®_uid,
+ ua_sess->root_shm_path, ua_sess->shm_path);
if (ret < 0) {
goto error;
}
app->uint16_t_alignment, app->uint32_t_alignment,
app->uint64_t_alignment, app->long_alignment,
app->byte_order, app->version.major,
- app->version.minor);
+ app->version.minor, reg_uid->root_shm_path,
+ reg_uid->shm_path, usess->uid, usess->gid);
if (ret < 0) {
/*
* reg_uid->registry->reg.ust is NULL upon error, so we need to
break;
case LTTNG_BUFFER_PER_UID:
/* Look for a global registry. If none exists, create one. */
- ret = setup_buffer_reg_uid(usess, app, NULL);
+ ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL);
if (ret < 0) {
delete_ust_app_session(-1, ua_sess, app);
goto error;
assert(reg_chan);
reg_chan->consumer_key = ua_chan->key;
reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
+ reg_chan->num_subbuf = ua_chan->attr.num_subbuf;
/* Create and add a channel registry to session. */
ret = ust_registry_channel_add(reg_sess->reg.ust,
/* Send channel to the application. */
ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan);
- if (ret < 0) {
+ if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
+ ret = -ENOTCONN; /* Caused by app exiting. */
+ goto error;
+ } else if (ret < 0) {
goto error;
}
ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream);
if (ret < 0) {
(void) release_ust_app_stream(-1, &stream);
+ if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) {
+ ret = -ENOTCONN; /* Caused by app exiting. */
+ goto error_stream_unlock;
+ } else if (ret < 0) {
+ goto error_stream_unlock;
+ }
goto error_stream_unlock;
}
/* Send buffers to the application. */
ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
if (ret < 0) {
- /*
- * Don't report error to the console, since it may be
- * caused by application concurrently exiting.
- */
+ if (ret != -ENOTCONN) {
+ ERR("Error sending channel to application");
+ }
goto error;
}
ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
if (ret < 0) {
- /*
- * Don't report error to the console, since it may be
- * caused by application concurrently exiting.
- */
+ if (ret != -ENOTCONN) {
+ ERR("Error sending channel to application");
+ }
goto error;
}
* need and send it to the application. This MUST be called with a RCU read
* side lock acquired.
*
- * Return 0 on success or else a negative value.
+ * Return 0 on success or else a negative value. Returns -ENOTCONN if
+ * the application exited concurrently.
*/
static int do_create_channel(struct ust_app *app,
struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
*
* Called with UST app session lock and RCU read-side lock held.
*
- * Return 0 on success or else a negative value.
+ * Return 0 on success or else a negative value. Returns -ENOTCONN if
+ * the application exited concurrently.
*/
static int create_ust_app_channel(struct ust_app_session *ua_sess,
struct ltt_ust_channel *uchan, struct ust_app *app,
*/
pthread_mutex_lock(&ua_sess->lock);
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ continue;
+ }
+
/*
* Normally, this is done in the delete session process which is
* executed in the call rcu below. However, upon registration we can't
*/
continue;
}
+ if (!trace_ust_pid_tracker_lookup(usess, app->pid)) {
+ /* Skip. */
+ continue;
+ }
+
/*
* Create session on the tracer side and add it to app session HT. Note
* that if session exist, it will simply return a pointer to the ust
* or a timeout on it. We can't inform the caller that for a
* specific app, the session failed so lets continue here.
*/
+ ret = 0; /* Not an error. */
continue;
case -ENOMEM:
default:
assert(ua_sess);
pthread_mutex_lock(&ua_sess->lock);
+
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ continue;
+ }
+
if (!strncmp(uchan->name, DEFAULT_METADATA_NAME,
sizeof(uchan->name))) {
copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr);
}
pthread_mutex_unlock(&ua_sess->lock);
if (ret < 0) {
- if (ret == -ENOMEM) {
- /* No more memory is a fatal error. Stop right now. */
- goto error_rcu_unlock;
- }
/* Cleanup the created session if it's the case. */
if (created) {
destroy_app_session(app, ua_sess);
}
+ switch (ret) {
+ case -ENOTCONN:
+ /*
+ * The application's socket is not valid. Either a bad socket
+ * or a timeout on it. We can't inform the caller that for a
+ * specific app, the session failed so lets continue here.
+ */
+ ret = 0; /* Not an error. */
+ continue;
+ case -ENOMEM:
+ default:
+ goto error_rcu_unlock;
+ }
}
}
pthread_mutex_lock(&ua_sess->lock);
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ continue;
+ }
+
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
- /* If the channel is not found, there is a code flow error */
- assert(ua_chan_node);
+ /*
+ * It is possible that the channel cannot be found is
+ * the channel/event creation occurs concurrently with
+ * an application exit.
+ */
+ if (!ua_chan_node) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ continue;
+ }
ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
}
pthread_mutex_lock(&ua_sess->lock);
+
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ continue;
+ }
+
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
pthread_mutex_lock(&ua_sess->lock);
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ goto end;
+ }
+
/* Upon restart, we skip the setup, already done */
if (ua_sess->started) {
goto skip_setup;
ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid);
if (ret < 0) {
- if (ret != -EEXIST) {
+ if (errno != EEXIST) {
ERR("Trace directory creation error");
goto error_unlock;
}
pthread_mutex_lock(&ua_sess->lock);
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ goto end_no_session;
+ }
+
/*
* If started = 0, it means that stop trace has been called for a session
* that was never started. It's possible since we can have a fail start
pthread_mutex_lock(&ua_sess->lock);
+ if (ua_sess->deleted) {
+ goto end_deleted;
+ }
+
health_code_update();
/* Flushing buffers */
health_code_update();
+end_deleted:
pthread_mutex_unlock(&ua_sess->lock);
end_not_compatible:
int ust_app_flush_session(struct ltt_ust_session *usess)
{
- int ret;
+ int ret = 0;
DBG("Flushing session buffers for all ust apps");
/* Push metadata. */
(void) push_metadata(ust_session_reg, usess->consumer);
}
- ret = 0;
break;
}
case LTTNG_BUFFER_PER_PID:
break;
}
default:
+ ret = -1;
assert(0);
break;
}
-end_no_session:
rcu_read_unlock();
health_code_update();
return ret;
return 0;
}
-/*
- * Add channels/events from UST global domain to registered apps at sock.
- */
-void ust_app_global_update(struct ltt_ust_session *usess, int sock)
+static
+void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app)
{
int ret = 0;
struct lttng_ht_iter iter, uiter;
- struct ust_app *app;
struct ust_app_session *ua_sess = NULL;
struct ust_app_channel *ua_chan;
struct ust_app_event *ua_event;
struct ust_app_ctx *ua_ctx;
+ int is_created = 0;
- assert(usess);
- assert(sock >= 0);
-
- DBG2("UST app global update for app sock %d for session id %" PRIu64, sock,
- usess->id);
-
- rcu_read_lock();
-
- app = ust_app_find_by_sock(sock);
- if (app == NULL) {
- /*
- * Application can be unregistered before so this is possible hence
- * simply stopping the update.
- */
- DBG3("UST app update failed to find app sock %d", sock);
- goto error;
- }
-
- if (!app->compatible) {
- goto error;
- }
-
- ret = create_ust_app_session(usess, app, &ua_sess, NULL);
+ ret = create_ust_app_session(usess, app, &ua_sess, &is_created);
if (ret < 0) {
/* Tracer is probably gone or ENOMEM. */
goto error;
}
+ if (!is_created) {
+ /* App session already created. */
+ goto end;
+ }
assert(ua_sess);
pthread_mutex_lock(&ua_sess->lock);
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ goto end;
+ }
+
/*
* We can iterate safely here over all UST app session since the create ust
* app session above made a shadow copy of the UST global domain from the
cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
node.node) {
ret = do_create_channel(app, usess, ua_sess, ua_chan);
- if (ret < 0) {
+ if (ret < 0 && ret != -ENOTCONN) {
/*
- * Stop everything. On error, the application failed, no more
- * file descriptor are available or ENOMEM so stopping here is
- * the only thing we can do for now.
+ * Stop everything. On error, the application
+ * failed, no more file descriptor are available
+ * or ENOMEM so stopping here is the only thing
+ * we can do for now. The only exception is
+ * -ENOTCONN, which indicates that the application
+ * has exit.
*/
goto error_unlock;
}
DBG2("UST trace started for app pid %d", app->pid);
}
-
+end:
/* Everything went well at this point. */
- rcu_read_unlock();
return;
error_unlock:
if (ua_sess) {
destroy_app_session(app, ua_sess);
}
- rcu_read_unlock();
return;
}
+static
+void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app)
+{
+ struct ust_app_session *ua_sess;
+
+ ua_sess = lookup_session_by_app(usess, app);
+ if (ua_sess == NULL) {
+ return;
+ }
+ destroy_app_session(app, ua_sess);
+}
+
+/*
+ * Add channels/events from UST global domain to registered apps at sock.
+ *
+ * Called with session lock held.
+ * Called with RCU read-side lock held.
+ */
+void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
+{
+ assert(usess);
+
+ DBG2("UST app global update for app sock %d for session id %" PRIu64,
+ app->sock, usess->id);
+
+ if (!app->compatible) {
+ return;
+ }
+
+ if (trace_ust_pid_tracker_lookup(usess, app->pid)) {
+ ust_app_global_create(usess, app);
+ } else {
+ ust_app_global_destroy(usess, app);
+ }
+}
+
+/*
+ * Called with session lock held.
+ */
+void ust_app_global_update_all(struct ltt_ust_session *usess)
+{
+ struct lttng_ht_iter iter;
+ struct ust_app *app;
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+ ust_app_global_update(usess, app);
+ }
+ rcu_read_unlock();
+}
+
/*
* Add context to a specific channel for global UST domain.
*/
}
pthread_mutex_lock(&ua_sess->lock);
+
+ if (ua_sess->deleted) {
+ pthread_mutex_unlock(&ua_sess->lock);
+ continue;
+ }
+
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
}
pthread_mutex_lock(&ua_sess->lock);
+
+ if (ua_sess->deleted) {
+ ret = 0;
+ goto end_unlock;
+ }
+
/* Lookup channel in the ust app session */
lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
ua_chan_node = lttng_ht_iter_get_node_str(&iter);
* Return 0 on success or else a negative value.
*/
int ust_app_snapshot_record(struct ltt_ust_session *usess,
- struct snapshot_output *output, int wait, uint64_t max_stream_size)
+ struct snapshot_output *output, int wait,
+ uint64_t nb_packets_per_stream)
{
int ret = 0;
unsigned int snapshot_done = 0;
reg_chan, node.node) {
ret = consumer_snapshot_channel(socket, reg_chan->consumer_key,
output, 0, usess->uid, usess->gid, pathname, wait,
- max_stream_size);
+ nb_packets_per_stream);
if (ret < 0) {
goto error;
}
}
ret = consumer_snapshot_channel(socket,
reg->registry->reg.ust->metadata_key, output, 1,
- usess->uid, usess->gid, pathname, wait, max_stream_size);
+ usess->uid, usess->gid, pathname, wait, 0);
if (ret < 0) {
goto error;
}
ua_chan, node.node) {
ret = consumer_snapshot_channel(socket, ua_chan->key, output,
0, ua_sess->euid, ua_sess->egid, pathname, wait,
- max_stream_size);
+ nb_packets_per_stream);
if (ret < 0) {
goto error;
}
registry = get_session_registry(ua_sess);
assert(registry);
ret = consumer_snapshot_channel(socket, registry->metadata_key, output,
- 1, ua_sess->euid, ua_sess->egid, pathname, wait,
- max_stream_size);
+ 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0);
if (ret < 0) {
goto error;
}
}
/*
- * Return the number of streams for a UST session.
+ * Return the size taken by one more packet per stream.
*/
-unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
+uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess,
+ uint64_t cur_nr_packets)
{
- unsigned int ret = 0;
+ uint64_t tot_size = 0;
struct ust_app *app;
struct lttng_ht_iter iter;
rcu_read_lock();
cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
reg_chan, node.node) {
- ret += reg_chan->stream_count;
+ if (cur_nr_packets >= reg_chan->num_subbuf) {
+ /*
+ * Don't take channel into account if we
+ * already grab all its packets.
+ */
+ continue;
+ }
+ tot_size += reg_chan->subbuf_size * reg_chan->stream_count;
}
rcu_read_unlock();
}
cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
ua_chan, node.node) {
- ret += ua_chan->streams.count;
+ if (cur_nr_packets >= ua_chan->attr.num_subbuf) {
+ /*
+ * Don't take channel into account if we
+ * already grab all its packets.
+ */
+ continue;
+ }
+ tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count;
}
}
rcu_read_unlock();
break;
}
- return ret;
+ return tot_size;
}
projects / lttng-tools.git / blobdiff