X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fust-app.c;h=c81f6e8f5597e1531292cfee2e4f5b5f57faf0dd;hp=8dd7a9d1c8d43a64e03f891871ce7ae98b773140;hb=025faf73cdb6942ebf437dc4c4f6631f0134b128;hpb=601d5acf42ebdb05ff8aa19f12fd9bdad3602781 diff --git a/src/bin/lttng-sessiond/ust-app.c b/src/bin/lttng-sessiond/ust-app.c index 8dd7a9d1c..c81f6e8f5 100644 --- a/src/bin/lttng-sessiond/ust-app.c +++ b/src/bin/lttng-sessiond/ust-app.c @@ -36,6 +36,90 @@ #include "ust-consumer.h" #include "ust-ctl.h" +/* + * Match function for the hash table lookup. + * + * It matches an ust app event based on three attributes which are the event + * name, the filter bytecode and the loglevel. + */ +static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) +{ + struct ust_app_event *event; + const struct ust_app_ht_key *key; + + assert(node); + assert(_key); + + event = caa_container_of(node, struct ust_app_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; + } + } + + /* 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; +} + +/* + * Unique add of an ust app event in the given ht. This uses the custom + * ht_match_ust_app_event match function and the event name as hash. + */ +static void add_unique_ust_app_event(struct lttng_ht *ht, + struct ust_app_event *event) +{ + struct cds_lfht_node *node_ptr; + struct ust_app_ht_key key; + + assert(ht); + assert(ht->ht); + assert(event); + + key.name = event->attr.name; + key.filter = event->filter; + key.loglevel = event->attr.loglevel; + + node_ptr = cds_lfht_add_unique(ht->ht, + ht->hash_fct(event->node.key, lttng_ht_seed), + ht_match_ust_app_event, &key, &event->node.node); + assert(node_ptr == &event->node.node); +} + /* * Delete ust context safely. RCU read lock must be held before calling * this function. @@ -352,6 +436,29 @@ error: return ua_ctx; } +/* + * Allocate a filter and copy the given original filter. + * + * 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) +{ + struct lttng_ust_filter_bytecode *filter = NULL; + + /* Copy filter bytecode */ + filter = zmalloc(sizeof(*filter) + orig_f->len); + if (!filter) { + PERROR("zmalloc alloc ust app filter"); + goto error; + } + + 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. @@ -375,6 +482,42 @@ error: return NULL; } +/* + * Lookup for an ust app event based on event name, filter bytecode and the + * event loglevel. + * + * 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) +{ + struct lttng_ht_iter iter; + struct lttng_ht_node_str *node; + struct ust_app_event *event = NULL; + struct ust_app_ht_key key; + + assert(name); + assert(ht); + + /* Setup key for event lookup. */ + key.name = name; + key.filter = filter; + key.loglevel = loglevel; + + /* 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), + ht_match_ust_app_event, &key, &iter.iter); + node = lttng_ht_iter_get_node_str(&iter); + if (node == NULL) { + goto end; + } + + event = caa_container_of(node, struct ust_app_event, node); + +end: + return event; +} + /* * Create the channel context on the tracer. */ @@ -685,6 +828,14 @@ int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, health_code_update(&health_thread_cmd); + /* Set filter if one is present. */ + if (ua_event->filter) { + ret = set_ust_event_filter(ua_event, app); + if (ret < 0) { + goto error; + } + } + /* If event not enabled, disable it on the tracer */ if (ua_event->enabled == 0) { ret = disable_ust_event(app, ua_sess, ua_event); @@ -730,13 +881,8 @@ static void shadow_copy_event(struct ust_app_event *ua_event, /* Copy filter bytecode */ if (uevent->filter) { - ua_event->filter = zmalloc(sizeof(*ua_event->filter) + - uevent->filter->len); - if (!ua_event->filter) { - return; - } - memcpy(ua_event->filter, uevent->filter, - sizeof(*ua_event->filter) + uevent->filter->len); + ua_event->filter = alloc_copy_ust_app_filter(uevent->filter); + /* Filter might be NULL here in case of ENONEM. */ } } @@ -747,7 +893,6 @@ static void shadow_copy_channel(struct ust_app_channel *ua_chan, struct ltt_ust_channel *uchan) { struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_event_node; struct ltt_ust_event *uevent; struct ltt_ust_context *uctx; struct ust_app_event *ua_event; @@ -774,11 +919,9 @@ static void shadow_copy_channel(struct ust_app_channel *ua_chan, /* Copy all events from ltt ust channel to ust app channel */ cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { - struct lttng_ht_iter uiter; - - lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter); - ua_event_node = lttng_ht_iter_get_node_str(&uiter); - if (ua_event_node == NULL) { + ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, + uevent->filter, uevent->attr.loglevel); + if (ua_event == NULL) { DBG2("UST event %s not found on shadow copy channel", uevent->attr.name); ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); @@ -786,7 +929,7 @@ static void shadow_copy_channel(struct ust_app_channel *ua_chan, continue; } shadow_copy_event(ua_event, uevent); - lttng_ht_add_unique_str(ua_chan->events, &ua_event->node); + add_unique_ust_app_event(ua_chan->events, ua_event); } } @@ -980,35 +1123,6 @@ error: return ret; } -/* - * Set UST filter for the event on the tracer. - */ -static -int set_ust_app_event_filter(struct ust_app_session *ua_sess, - struct ust_app_event *ua_event, - struct lttng_filter_bytecode *bytecode, - struct ust_app *app) -{ - int ret = 0; - - DBG2("UST app adding context to event %s", ua_event->name); - - /* Copy filter bytecode */ - ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len); - if (!ua_event->filter) { - return -ENOMEM; - } - memcpy(ua_event->filter, bytecode, - sizeof(*ua_event->filter) + bytecode->len); - ret = set_ust_event_filter(ua_event, app); - if (ret < 0) { - goto error; - } - -error: - return ret; -} - /* * Enable on the tracer side a ust app event for the session and channel. */ @@ -1154,14 +1268,12 @@ int create_ust_app_event(struct ust_app_session *ua_sess, struct ust_app *app) { int ret = 0; - struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_event_node; struct ust_app_event *ua_event; /* Get event node */ - lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); - ua_event_node = lttng_ht_iter_get_node_str(&iter); - if (ua_event_node != NULL) { + ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, + uevent->filter, uevent->attr.loglevel); + if (ua_event != NULL) { ret = -EEXIST; goto end; } @@ -1183,7 +1295,7 @@ int create_ust_app_event(struct ust_app_session *ua_sess, goto error; } - lttng_ht_add_unique_str(ua_chan->events, &ua_event->node); + add_unique_ust_app_event(ua_chan->events, ua_event); DBG2("UST app create event %s for PID %d completed", ua_event->name, app->pid); @@ -1948,7 +2060,7 @@ int ust_app_enable_event_glb(struct ltt_ust_session *usess, { int ret = 0; struct lttng_ht_iter iter, uiter; - struct lttng_ht_node_str *ua_chan_node, *ua_event_node; + struct lttng_ht_node_str *ua_chan_node; struct ust_app *app; struct ust_app_session *ua_sess; struct ust_app_channel *ua_chan; @@ -1986,14 +2098,14 @@ int ust_app_enable_event_glb(struct ltt_ust_session *usess, ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter); - ua_event_node = lttng_ht_iter_get_node_str(&uiter); - if (ua_event_node == NULL) { + /* Get event node */ + ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, + uevent->filter, uevent->attr.loglevel); + if (ua_event == NULL) { DBG3("UST app enable event %s not found for app PID %d." "Skipping app", uevent->attr.name, app->pid); continue; } - ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); ret = enable_ust_app_event(ua_sess, ua_event, app); if (ret < 0) { @@ -2573,63 +2685,6 @@ int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, return ret; } -/* - * Add context to a specific event in a channel for global UST domain. - */ -int ust_app_set_filter_event_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, - struct lttng_filter_bytecode *bytecode) -{ - int ret = 0; - struct lttng_ht_node_str *ua_chan_node, *ua_event_node; - struct lttng_ht_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->ht, &iter.iter, app, pid_n.node) { - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - 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 (ua_chan_node == NULL) { - continue; - } - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, - node); - - lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter); - ua_event_node = lttng_ht_iter_get_node_str(&uiter); - if (ua_event_node == NULL) { - continue; - } - ua_event = caa_container_of(ua_event_node, struct ust_app_event, - node); - - ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app); - if (ret < 0) { - continue; - } - } - - rcu_read_unlock(); - return ret; -} - /* * Enable event for a channel from a UST session for a specific PID. */ @@ -2638,7 +2693,7 @@ int ust_app_enable_event_pid(struct ltt_ust_session *usess, { int ret = 0; struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_chan_node, *ua_event_node; + struct lttng_ht_node_str *ua_chan_node; struct ust_app *app; struct ust_app_session *ua_sess; struct ust_app_channel *ua_chan; @@ -2672,16 +2727,14 @@ int ust_app_enable_event_pid(struct ltt_ust_session *usess, ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter); - ua_event_node = lttng_ht_iter_get_node_str(&iter); - if (ua_event_node == NULL) { + ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, + uevent->filter, uevent->attr.loglevel); + if (ua_event == NULL) { ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); if (ret < 0) { goto error; } } else { - ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); - ret = enable_ust_app_event(ua_sess, ua_event, app); if (ret < 0) { goto error;