/*
* ltt-probes.c
*
- * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
* Holds LTTng probes registry.
*
- * Dual LGPL v2.1/GPL v2 license.
+ * Copyright 2010-2012 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <urcu/list.h>
#include <urcu/hlist.h>
#include <lttng/ust-events.h>
+#include <lttng/tracepoint.h>
+#include "tracepoint-internal.h"
#include <assert.h>
#include <helper.h>
+#include <ctype.h>
#include "ltt-tracer-core.h"
#include "jhash.h"
*/
static CDS_LIST_HEAD(probe_list);
-/*
- * Loglevel hash table, containing the active loglevels.
- * Protected by ust lock.
- */
-#define LOGLEVEL_HASH_BITS 6
-#define LOGLEVEL_TABLE_SIZE (1 << LOGLEVEL_HASH_BITS)
-static struct cds_hlist_head loglevel_table[LOGLEVEL_TABLE_SIZE];
-
static
const struct lttng_probe_desc *find_provider(const char *provider)
{
cds_list_for_each_entry(probe_desc, &probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- if (!strcmp(probe_desc->event_desc[i]->name, name))
+ if (!strncmp(probe_desc->event_desc[i]->name, name,
+ LTTNG_UST_SYM_NAME_LEN - 1))
return probe_desc->event_desc[i];
}
}
/* We should be added at the head of the list */
cds_list_add(&desc->head, &probe_list);
desc_added:
-
+ DBG("just registered probe %s containing %u events",
+ desc->provider, desc->nr_events);
/*
* fix the events awaiting probe load.
*/
for (i = 0; i < desc->nr_events; i++) {
- ret = pending_probe_fix_events(desc->event_desc[i]);
+ const struct lttng_event_desc *ed;
+
+ ed = desc->event_desc[i];
+ DBG("Registered event probe \"%s\" with signature \"%s\"",
+ ed->name, ed->signature);
+ ret = pending_probe_fix_events(ed);
assert(!ret);
}
end:
{
ust_lock();
cds_list_del(&desc->head);
+ DBG("just unregistered probe %s", desc->provider);
ust_unlock();
}
LTTNG_UST_SYM_NAME_LEN);
list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
if (!probe_desc->event_desc[i]->loglevel) {
- list_entry->tp.loglevel[0] = '\0';
- list_entry->tp.loglevel_value = 0;
+ list_entry->tp.loglevel = TRACE_DEFAULT;
} else {
- strncpy(list_entry->tp.loglevel,
- (*probe_desc->event_desc[i]->loglevel)->identifier,
- LTTNG_UST_SYM_NAME_LEN);
- list_entry->tp.loglevel[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
- list_entry->tp.loglevel_value =
- (*probe_desc->event_desc[i]->loglevel)->value;
+ list_entry->tp.loglevel = *(*probe_desc->event_desc[i]->loglevel);
}
}
}
return &entry->tp;
}
-/*
- * Get loglevel if the loglevel is present in the loglevel hash table.
- * Must be called with ust lock held.
- * Returns NULL if not present.
- */
-struct loglevel_entry *get_loglevel(const char *name)
-{
- struct cds_hlist_head *head;
- struct cds_hlist_node *node;
- struct loglevel_entry *e;
- uint32_t hash = jhash(name, strlen(name), 0);
-
- head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)];
- cds_hlist_for_each_entry(e, node, head, hlist) {
- if (!strcmp(name, e->name))
- return e;
- }
- return NULL;
-}
-
/*
* marshall all probes/all events and create those that fit the
- * loglevel. Add them to the events list as created.
+ * wildcard. Add them to the events list as created.
*/
-static
-void _probes_create_loglevel_events(struct loglevel_entry *entry,
- struct session_loglevel *loglevel)
+void ltt_probes_create_wildcard_events(struct wildcard_entry *entry,
+ struct session_wildcard *wildcard)
{
struct lttng_probe_desc *probe_desc;
struct lttng_ust_event event_param;
cds_list_for_each_entry(probe_desc, &probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- const struct tracepoint_loglevel_entry *ev_ll;
const struct lttng_event_desc *event_desc;
+ int match = 0;
event_desc = probe_desc->event_desc[i];
- if (!(event_desc->loglevel))
- continue;
- ev_ll = *event_desc->loglevel;
- if (!strcmp(ev_ll->identifier, entry->name)) {
+ /* compare excluding final '*' */
+ assert(strlen(entry->name) > 0);
+ if (strcmp(event_desc->name, "lttng_ust:metadata")
+ && (strlen(entry->name) == 1
+ || !strncmp(event_desc->name, entry->name,
+ strlen(entry->name) - 1))) {
+ if (ltt_loglevel_match(event_desc,
+ entry->loglevel_type,
+ entry->loglevel)) {
+ match = 1;
+ }
+ }
+ if (match) {
struct ltt_event *ev;
int ret;
- memcpy(&event_param, &loglevel->event_param,
+ memcpy(&event_param, &wildcard->event_param,
sizeof(event_param));
- memcpy(event_param.name,
+ strncpy(event_param.name,
event_desc->name,
sizeof(event_param.name));
+ event_param.name[sizeof(event_param.name) - 1] = '\0';
/* create event */
- ret = ltt_event_create(loglevel->chan,
+ ret = ltt_event_create(wildcard->chan,
&event_param, NULL,
&ev);
if (ret) {
DBG("Error creating event");
continue;
}
- cds_list_add(&ev->loglevel_list,
- &loglevel->events);
+ cds_list_add(&ev->wildcard_list,
+ &wildcard->events);
}
}
}
}
-/*
- * Add the loglevel to the loglevel hash table. Must be called with
- * ust lock held.
- */
-struct session_loglevel *add_loglevel(const char *name,
- struct ltt_channel *chan,
- struct lttng_ust_event *event_param)
-{
- struct cds_hlist_head *head;
- struct cds_hlist_node *node;
- struct loglevel_entry *e;
- struct session_loglevel *sl;
- size_t name_len = strlen(name) + 1;
- uint32_t hash = jhash(name, name_len-1, 0);
- int found = 0;
-
- /* loglevel entry */
- head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)];
- cds_hlist_for_each_entry(e, node, head, hlist) {
- if (!strcmp(name, e->name)) {
- found = 1;
- break;
- }
- }
-
- if (!found) {
- /*
- * Using zmalloc here to allocate a variable length element. Could
- * cause some memory fragmentation if overused.
- */
- e = zmalloc(sizeof(struct loglevel_entry) + name_len);
- if (!e)
- return ERR_PTR(-ENOMEM);
- memcpy(&e->name[0], name, name_len);
- cds_hlist_add_head(&e->hlist, head);
- CDS_INIT_LIST_HEAD(&e->session_list);
- }
-
- /* session loglevel */
- cds_list_for_each_entry(sl, &e->session_list, session_list) {
- if (chan == sl->chan) {
- DBG("loglevel %s busy for this channel", name);
- return ERR_PTR(-EEXIST); /* Already there */
- }
- }
- sl = zmalloc(sizeof(struct session_loglevel));
- if (!sl)
- return ERR_PTR(-ENOMEM);
- sl->chan = chan;
- sl->enabled = 1;
- memcpy(&sl->event_param, event_param, sizeof(sl->event_param));
- sl->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
- CDS_INIT_LIST_HEAD(&sl->events);
- cds_list_add(&sl->list, &chan->session->loglevels);
- cds_list_add(&sl->session_list, &e->session_list);
- sl->entry = e;
- _probes_create_loglevel_events(e, sl);
- return sl;
-}
-
-/*
- * Remove the loglevel from the loglevel hash table. Must be called with
- * ust_lock held. Only called at session teardown.
- */
-void _remove_loglevel(struct session_loglevel *loglevel)
-{
- struct ltt_event *ev, *tmp;
-
- /*
- * Just remove the events owned (for enable/disable) by this
- * loglevel from the list. The session teardown will take care
- * of freeing the event memory.
- */
- cds_list_for_each_entry_safe(ev, tmp, &loglevel->events, list) {
- cds_list_del(&ev->list);
- }
- cds_list_del(&loglevel->session_list);
- cds_list_del(&loglevel->list);
- if (cds_list_empty(&loglevel->entry->session_list)) {
- cds_hlist_del(&loglevel->entry->hlist);
- free(loglevel->entry);
- }
- free(loglevel);
-}
-
-int ltt_loglevel_enable(struct session_loglevel *loglevel)
-{
- struct ltt_event *ev;
- int ret;
-
- if (loglevel->enabled)
- return -EEXIST;
- cds_list_for_each_entry(ev, &loglevel->events, list) {
- ret = ltt_event_enable(ev);
- if (ret) {
- DBG("Error: enable error.\n");
- return ret;
- }
- }
- loglevel->enabled = 1;
- return 0;
-}
-
-int ltt_loglevel_disable(struct session_loglevel *loglevel)
-{
- struct ltt_event *ev;
- int ret;
-
- if (!loglevel->enabled)
- return -EEXIST;
- cds_list_for_each_entry(ev, &loglevel->events, list) {
- ret = ltt_event_disable(ev);
- if (ret) {
- DBG("Error: disable error.\n");
- return ret;
- }
- }
- loglevel->enabled = 0;
- return 0;
-}
projects / lttng-ust.git / blobdiff