/*
- * lttng-events.c
- *
- * Holds LTTng per-session event registry.
+ * SPDX-License-Identifier: LGPL-2.1-only
*
* Copyright (C) 2010-2012 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
+ * Holds LTTng per-session event registry.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <stdio.h>
-#include <urcu/list.h>
-#include <urcu/hlist.h>
-#include <pthread.h>
+#include <assert.h>
#include <errno.h>
+#include <limits.h>
+#include <pthread.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#include <stdint.h>
#include <stddef.h>
#include <inttypes.h>
#include <time.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <dlfcn.h>
#include <lttng/ust-endian.h>
-#include "clock.h"
-#include <urcu-bp.h>
+#include <urcu/arch.h>
#include <urcu/compiler.h>
+#include <urcu/hlist.h>
+#include <urcu/list.h>
#include <urcu/uatomic.h>
-#include <urcu/arch.h>
#include <lttng/tracepoint.h>
#include <lttng/ust-events.h>
#include <usterr-signal-safe.h>
#include <helper.h>
-#include <ust-ctl.h>
+#include <lttng/ust-ctl.h>
#include <ust-comm.h>
+#include <ust-fd.h>
+#include <lttng/ust-dynamic-type.h>
+#include <lttng/ust-context-provider.h>
#include "error.h"
#include "compat.h"
#include "lttng-ust-uuid.h"
#include "tracepoint-internal.h"
+#include "string-utils.h"
+#include "lttng-bytecode.h"
#include "lttng-tracer.h"
#include "lttng-tracer-core.h"
+#include "lttng-ust-statedump.h"
+#include "context-internal.h"
+#include "ust-events-internal.h"
#include "wait.h"
#include "../libringbuffer/shm.h"
+#include "../libcounter/counter.h"
#include "jhash.h"
+#include <lttng/ust-abi.h>
/*
- * The sessions mutex is the centralized mutex across UST tracing
- * control and probe registration. All operations within this file are
- * called by the communication thread, under ust_lock protection.
+ * All operations within this file are called by the communication
+ * thread, under ust_lock protection.
*/
-static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER;
-void ust_lock(void)
-{
- pthread_mutex_lock(&sessions_mutex);
-}
+static CDS_LIST_HEAD(sessions);
+static CDS_LIST_HEAD(event_notifier_groups);
-void ust_unlock(void)
+struct cds_list_head *_lttng_get_sessions(void)
{
- pthread_mutex_unlock(&sessions_mutex);
+ return &sessions;
}
-static CDS_LIST_HEAD(sessions);
-
static void _lttng_event_destroy(struct lttng_event *event);
-static int _lttng_event_unregister(struct lttng_event *event);
-static
-int _lttng_event_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan,
- struct lttng_event *event);
-static
-int _lttng_session_metadata_statedump(struct lttng_session *session);
+static void _lttng_event_notifier_destroy(
+ struct lttng_event_notifier *event_notifier);
+static void _lttng_enum_destroy(struct lttng_enum *_enum);
static
-void lttng_session_lazy_sync_enablers(struct lttng_session *session);
+void lttng_session_lazy_sync_event_enablers(struct lttng_session *session);
static
-void lttng_session_sync_enablers(struct lttng_session *session);
+void lttng_session_sync_event_enablers(struct lttng_session *session);
+static
+void lttng_event_notifier_group_sync_enablers(
+ struct lttng_event_notifier_group *event_notifier_group);
static
void lttng_enabler_destroy(struct lttng_enabler *enabler);
enum lttng_ust_loglevel_type req_type,
int req_loglevel)
{
- if (req_type == LTTNG_UST_LOGLEVEL_ALL)
- return 1;
if (!has_loglevel)
loglevel = TRACE_DEFAULT;
switch (req_type) {
case LTTNG_UST_LOGLEVEL_RANGE:
- if (loglevel <= req_loglevel || req_loglevel == -1)
+ if (loglevel <= req_loglevel
+ || (req_loglevel == -1 && loglevel <= TRACE_DEBUG))
return 1;
else
return 0;
case LTTNG_UST_LOGLEVEL_SINGLE:
- if (loglevel == req_loglevel || req_loglevel == -1)
+ if (loglevel == req_loglevel
+ || (req_loglevel == -1 && loglevel <= TRACE_DEBUG))
return 1;
else
return 0;
case LTTNG_UST_LOGLEVEL_ALL:
default:
- return 1;
+ if (loglevel <= TRACE_DEBUG)
+ return 1;
+ else
+ return 0;
}
}
-void synchronize_trace(void)
-{
- synchronize_rcu();
-}
-
struct lttng_session *lttng_session_create(void)
{
struct lttng_session *session;
session = zmalloc(sizeof(struct lttng_session));
if (!session)
return NULL;
+ if (lttng_context_init_all(&session->ctx)) {
+ free(session);
+ return NULL;
+ }
CDS_INIT_LIST_HEAD(&session->chan_head);
CDS_INIT_LIST_HEAD(&session->events_head);
+ CDS_INIT_LIST_HEAD(&session->enums_head);
CDS_INIT_LIST_HEAD(&session->enablers_head);
for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++)
CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]);
+ for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++)
+ CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]);
cds_list_add(&session->node, &sessions);
return session;
}
+struct lttng_counter *lttng_ust_counter_create(
+ const char *counter_transport_name,
+ size_t number_dimensions, const struct lttng_counter_dimension *dimensions)
+{
+ struct lttng_counter_transport *counter_transport = NULL;
+ struct lttng_counter *counter = NULL;
+
+ counter_transport = lttng_counter_transport_find(counter_transport_name);
+ if (!counter_transport)
+ goto notransport;
+ counter = zmalloc(sizeof(struct lttng_counter));
+ if (!counter)
+ goto nomem;
+
+ counter->ops = &counter_transport->ops;
+ counter->transport = counter_transport;
+
+ counter->counter = counter->ops->counter_create(
+ number_dimensions, dimensions, 0,
+ -1, 0, NULL, false);
+ if (!counter->counter) {
+ goto create_error;
+ }
+
+ return counter;
+
+create_error:
+ free(counter);
+nomem:
+notransport:
+ return NULL;
+}
+
+static
+void lttng_ust_counter_destroy(struct lttng_counter *counter)
+{
+ counter->ops->counter_destroy(counter->counter);
+ free(counter);
+}
+
+struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+ int i;
+
+ event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group));
+ if (!event_notifier_group)
+ return NULL;
+
+ /* Add all contexts. */
+ if (lttng_context_init_all(&event_notifier_group->ctx)) {
+ free(event_notifier_group);
+ return NULL;
+ }
+
+ CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head);
+ CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
+ for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++)
+ CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
+
+ cds_list_add(&event_notifier_group->node, &event_notifier_groups);
+
+ return event_notifier_group;
+}
+
/*
* Only used internally at session destruction.
*/
channel_destroy(chan, handle, 0);
}
+static
+void register_event(struct lttng_event *event)
+{
+ int ret;
+ const struct lttng_event_desc *desc;
+
+ assert(event->registered == 0);
+ desc = event->desc;
+ ret = __tracepoint_probe_register_queue_release(desc->name,
+ desc->probe_callback,
+ event, desc->signature);
+ WARN_ON_ONCE(ret);
+ if (!ret)
+ event->registered = 1;
+}
+
+static
+void register_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ int ret;
+ const struct lttng_event_desc *desc;
+
+ assert(event_notifier->registered == 0);
+ desc = event_notifier->desc;
+ ret = __tracepoint_probe_register_queue_release(desc->name,
+ desc->u.ext.event_notifier_callback, event_notifier, desc->signature);
+ WARN_ON_ONCE(ret);
+ if (!ret)
+ event_notifier->registered = 1;
+}
+
+static
+void unregister_event(struct lttng_event *event)
+{
+ int ret;
+ const struct lttng_event_desc *desc;
+
+ assert(event->registered == 1);
+ desc = event->desc;
+ ret = __tracepoint_probe_unregister_queue_release(desc->name,
+ desc->probe_callback,
+ event);
+ WARN_ON_ONCE(ret);
+ if (!ret)
+ event->registered = 0;
+}
+
+static
+void unregister_event_notifier(struct lttng_event_notifier *event_notifier)
+{
+ int ret;
+ const struct lttng_event_desc *desc;
+
+ assert(event_notifier->registered == 1);
+ desc = event_notifier->desc;
+ ret = __tracepoint_probe_unregister_queue_release(desc->name,
+ desc->u.ext.event_notifier_callback, event_notifier);
+ WARN_ON_ONCE(ret);
+ if (!ret)
+ event_notifier->registered = 0;
+}
+
+/*
+ * Only used internally at session destruction.
+ */
+static
+void _lttng_event_unregister(struct lttng_event *event)
+{
+ if (event->registered)
+ unregister_event(event);
+}
+
+/*
+ * Only used internally at session destruction.
+ */
+static
+void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier)
+{
+ if (event_notifier->registered)
+ unregister_event_notifier(event_notifier);
+}
+
void lttng_session_destroy(struct lttng_session *session)
{
struct lttng_channel *chan, *tmpchan;
struct lttng_event *event, *tmpevent;
- struct lttng_enabler *enabler, *tmpenabler;
- int ret;
+ struct lttng_enum *_enum, *tmp_enum;
+ struct lttng_event_enabler *event_enabler, *event_tmpenabler;
CMM_ACCESS_ONCE(session->active) = 0;
cds_list_for_each_entry(event, &session->events_head, node) {
- ret = _lttng_event_unregister(event);
- WARN_ON(ret);
+ _lttng_event_unregister(event);
}
- synchronize_trace(); /* Wait for in-flight events to complete */
- cds_list_for_each_entry_safe(enabler, tmpenabler,
+ lttng_ust_synchronize_trace(); /* Wait for in-flight events to complete */
+ __tracepoint_probe_prune_release_queue();
+ cds_list_for_each_entry_safe(event_enabler, event_tmpenabler,
&session->enablers_head, node)
- lttng_enabler_destroy(enabler);
+ lttng_event_enabler_destroy(event_enabler);
cds_list_for_each_entry_safe(event, tmpevent,
&session->events_head, node)
_lttng_event_destroy(event);
+ cds_list_for_each_entry_safe(_enum, tmp_enum,
+ &session->enums_head, node)
+ _lttng_enum_destroy(_enum);
cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node)
_lttng_channel_unmap(chan);
cds_list_del(&session->node);
+ lttng_destroy_context(session->ctx);
free(session);
}
+void lttng_event_notifier_group_destroy(
+ struct lttng_event_notifier_group *event_notifier_group)
+{
+ int close_ret;
+ struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler;
+ struct lttng_event_notifier *notifier, *tmpnotifier;
+
+ if (!event_notifier_group) {
+ return;
+ }
+
+ cds_list_for_each_entry(notifier,
+ &event_notifier_group->event_notifiers_head, node)
+ _lttng_event_notifier_unregister(notifier);
+
+ lttng_ust_synchronize_trace();
+
+ cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler,
+ &event_notifier_group->enablers_head, node)
+ lttng_event_notifier_enabler_destroy(notifier_enabler);
+
+ cds_list_for_each_entry_safe(notifier, tmpnotifier,
+ &event_notifier_group->event_notifiers_head, node)
+ _lttng_event_notifier_destroy(notifier);
+
+ if (event_notifier_group->error_counter)
+ lttng_ust_counter_destroy(event_notifier_group->error_counter);
+
+ /* Close the notification fd to the listener of event_notifiers. */
+
+ lttng_ust_lock_fd_tracker();
+ close_ret = close(event_notifier_group->notification_fd);
+ if (!close_ret) {
+ lttng_ust_delete_fd_from_tracker(
+ event_notifier_group->notification_fd);
+ } else {
+ PERROR("close");
+ abort();
+ }
+ lttng_ust_unlock_fd_tracker();
+
+ cds_list_del(&event_notifier_group->node);
+
+ free(event_notifier_group);
+}
+
+static
+void lttng_enabler_destroy(struct lttng_enabler *enabler)
+{
+ struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node;
+ struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node;
+
+ if (!enabler) {
+ return;
+ }
+
+ /* Destroy filter bytecode */
+ cds_list_for_each_entry_safe(filter_node, tmp_filter_node,
+ &enabler->filter_bytecode_head, node) {
+ free(filter_node);
+ }
+
+ /* Destroy excluders */
+ cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node,
+ &enabler->excluder_head, node) {
+ free(excluder_node);
+ }
+}
+
+ void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ if (!event_notifier_enabler) {
+ return;
+ }
+
+ cds_list_del(&event_notifier_enabler->node);
+
+ lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
+
+ free(event_notifier_enabler);
+}
+
+static
+int lttng_enum_create(const struct lttng_enum_desc *desc,
+ struct lttng_session *session)
+{
+ const char *enum_name = desc->name;
+ struct lttng_enum *_enum;
+ struct cds_hlist_head *head;
+ int ret = 0;
+ size_t name_len = strlen(enum_name);
+ uint32_t hash;
+ int notify_socket;
+
+ /* Check if this enum is already registered for this session. */
+ hash = jhash(enum_name, name_len, 0);
+ head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)];
+
+ _enum = lttng_ust_enum_get_from_desc(session, desc);
+ if (_enum) {
+ ret = -EEXIST;
+ goto exist;
+ }
+
+ notify_socket = lttng_get_notify_socket(session->owner);
+ if (notify_socket < 0) {
+ ret = notify_socket;
+ goto socket_error;
+ }
+
+ _enum = zmalloc(sizeof(*_enum));
+ if (!_enum) {
+ ret = -ENOMEM;
+ goto cache_error;
+ }
+ _enum->session = session;
+ _enum->desc = desc;
+
+ ret = ustcomm_register_enum(notify_socket,
+ session->objd,
+ enum_name,
+ desc->nr_entries,
+ desc->entries,
+ &_enum->id);
+ if (ret < 0) {
+ DBG("Error (%d) registering enumeration to sessiond", ret);
+ goto sessiond_register_error;
+ }
+ cds_list_add(&_enum->node, &session->enums_head);
+ cds_hlist_add_head(&_enum->hlist, head);
+ return 0;
+
+sessiond_register_error:
+ free(_enum);
+cache_error:
+socket_error:
+exist:
+ return ret;
+}
+
+static
+int lttng_create_enum_check(const struct lttng_type *type,
+ struct lttng_session *session)
+{
+ switch (type->atype) {
+ case atype_enum:
+ {
+ const struct lttng_enum_desc *enum_desc;
+ int ret;
+
+ enum_desc = type->u.legacy.basic.enumeration.desc;
+ ret = lttng_enum_create(enum_desc, session);
+ if (ret && ret != -EEXIST) {
+ DBG("Unable to create enum error: (%d)", ret);
+ return ret;
+ }
+ break;
+ }
+ case atype_enum_nestable:
+ {
+ const struct lttng_enum_desc *enum_desc;
+ int ret;
+
+ enum_desc = type->u.enum_nestable.desc;
+ ret = lttng_enum_create(enum_desc, session);
+ if (ret && ret != -EEXIST) {
+ DBG("Unable to create enum error: (%d)", ret);
+ return ret;
+ }
+ break;
+ }
+ case atype_dynamic:
+ {
+ const struct lttng_event_field *tag_field_generic;
+ const struct lttng_enum_desc *enum_desc;
+ int ret;
+
+ tag_field_generic = lttng_ust_dynamic_type_tag_field();
+ enum_desc = tag_field_generic->type.u.enum_nestable.desc;
+ ret = lttng_enum_create(enum_desc, session);
+ if (ret && ret != -EEXIST) {
+ DBG("Unable to create enum error: (%d)", ret);
+ return ret;
+ }
+ break;
+ }
+ default:
+ /* TODO: nested types when they become supported. */
+ break;
+ }
+ return 0;
+}
+
+static
+int lttng_create_all_event_enums(size_t nr_fields,
+ const struct lttng_event_field *event_fields,
+ struct lttng_session *session)
+{
+ size_t i;
+ int ret;
+
+ /* For each field, ensure enum is part of the session. */
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_type *type = &event_fields[i].type;
+
+ ret = lttng_create_enum_check(type, session);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static
+int lttng_create_all_ctx_enums(size_t nr_fields,
+ const struct lttng_ctx_field *ctx_fields,
+ struct lttng_session *session)
+{
+ size_t i;
+ int ret;
+
+ /* For each field, ensure enum is part of the session. */
+ for (i = 0; i < nr_fields; i++) {
+ const struct lttng_type *type = &ctx_fields[i].event_field.type;
+
+ ret = lttng_create_enum_check(type, session);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * Ensure that a state-dump will be performed for this session at the end
+ * of the current handle_message().
+ */
+int lttng_session_statedump(struct lttng_session *session)
+{
+ session->statedump_pending = 1;
+ lttng_ust_sockinfo_session_enabled(session->owner);
+ return 0;
+}
+
int lttng_session_enable(struct lttng_session *session)
{
int ret = 0;
if (notify_socket < 0)
return notify_socket;
+ /* Set transient enabler state to "enabled" */
+ session->tstate = 1;
+
/* We need to sync enablers with session before activation. */
- lttng_session_sync_enablers(session);
+ lttng_session_sync_event_enablers(session);
/*
* Snapshot the number of events per channel to know the type of header
*/
cds_list_for_each_entry(chan, &session->chan_head, node) {
const struct lttng_ctx *ctx;
- const struct lttng_event_field *fields = NULL;
+ const struct lttng_ctx_field *fields = NULL;
size_t nr_fields = 0;
+ uint32_t chan_id;
/* don't change it if session stop/restart */
if (chan->header_type)
ctx = chan->ctx;
if (ctx) {
nr_fields = ctx->nr_fields;
- fields = &ctx->fields->event_field;
+ fields = ctx->fields;
+ ret = lttng_create_all_ctx_enums(nr_fields, fields,
+ session);
+ if (ret < 0) {
+ DBG("Error (%d) adding enum to session", ret);
+ return ret;
+ }
}
ret = ustcomm_register_channel(notify_socket,
+ session,
session->objd,
chan->objd,
nr_fields,
fields,
- &chan->id,
+ &chan_id,
&chan->header_type);
- if (ret)
+ if (ret) {
+ DBG("Error (%d) registering channel to sessiond", ret);
return ret;
+ }
+ if (chan_id != chan->id) {
+ DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)",
+ chan_id, chan->id);
+ return -EINVAL;
+ }
}
+ /* Set atomically the state to "active" */
CMM_ACCESS_ONCE(session->active) = 1;
CMM_ACCESS_ONCE(session->been_active) = 1;
+
+ ret = lttng_session_statedump(session);
+ if (ret)
+ return ret;
end:
return ret;
}
ret = -EBUSY;
goto end;
}
+ /* Set atomically the state to "inactive" */
CMM_ACCESS_ONCE(session->active) = 0;
+
+ /* Set transient enabler state to "disabled" */
+ session->tstate = 0;
+ lttng_session_sync_event_enablers(session);
end:
return ret;
}
int lttng_channel_enable(struct lttng_channel *channel)
{
- int old;
+ int ret = 0;
- if (channel == channel->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&channel->enabled, 1);
- if (old)
- return -EEXIST;
- return 0;
+ if (channel->enabled) {
+ ret = -EBUSY;
+ goto end;
+ }
+ /* Set transient enabler state to "enabled" */
+ channel->tstate = 1;
+ lttng_session_sync_event_enablers(channel->session);
+ /* Set atomically the state to "enabled" */
+ CMM_ACCESS_ONCE(channel->enabled) = 1;
+end:
+ return ret;
}
int lttng_channel_disable(struct lttng_channel *channel)
{
- int old;
+ int ret = 0;
- if (channel == channel->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&channel->enabled, 0);
- if (!old)
- return -EEXIST;
- return 0;
+ if (!channel->enabled) {
+ ret = -EBUSY;
+ goto end;
+ }
+ /* Set atomically the state to "disabled" */
+ CMM_ACCESS_ONCE(channel->enabled) = 0;
+ /* Set transient enabler state to "enabled" */
+ channel->tstate = 0;
+ lttng_session_sync_event_enablers(channel->session);
+end:
+ return ret;
}
-int lttng_event_enable(struct lttng_event *event)
+static inline
+struct cds_hlist_head *borrow_hash_table_bucket(
+ struct cds_hlist_head *hash_table,
+ unsigned int hash_table_size,
+ const struct lttng_event_desc *desc)
{
- int old;
+ const char *event_name;
+ size_t name_len;
+ uint32_t hash;
- if (event->chan == event->chan->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&event->enabled, 1);
- if (old)
- return -EEXIST;
- return 0;
-}
+ event_name = desc->name;
+ name_len = strlen(event_name);
-int lttng_event_disable(struct lttng_event *event)
-{
- int old;
-
- if (event->chan == event->chan->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&event->enabled, 0);
- if (!old)
- return -EEXIST;
- return 0;
-}
+ hash = jhash(event_name, name_len, 0);
+ return &hash_table[hash & (hash_table_size - 1)];
+}
/*
* Supports event creation while tracing session is active.
int lttng_event_create(const struct lttng_event_desc *desc,
struct lttng_channel *chan)
{
- const char *event_name = desc->name;
struct lttng_event *event;
struct lttng_session *session = chan->session;
struct cds_hlist_head *head;
- struct cds_hlist_node *node;
int ret = 0;
- size_t name_len = strlen(event_name);
- uint32_t hash;
int notify_socket, loglevel;
const char *uri;
- hash = jhash(event_name, name_len, 0);
- head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
- cds_hlist_for_each_entry(event, node, head, hlist) {
- assert(event->desc);
- if (!strncmp(event->desc->name,
- desc->name,
- LTTNG_UST_SYM_NAME_LEN - 1)) {
- ret = -EEXIST;
- goto exist;
- }
- }
+ head = borrow_hash_table_bucket(chan->session->events_ht.table,
+ LTTNG_UST_EVENT_HT_SIZE, desc);
notify_socket = lttng_get_notify_socket(session->owner);
if (notify_socket < 0) {
goto socket_error;
}
+ ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields,
+ session);
+ if (ret < 0) {
+ DBG("Error (%d) adding enum to session", ret);
+ goto create_enum_error;
+ }
+
/*
* Check if loglevel match. Refuse to connect event if not.
*/
}
event->chan = chan;
- event->enabled = 1;
- CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head);
+ /* Event will be enabled by enabler sync. */
+ event->enabled = 0;
+ event->registered = 0;
+ CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head);
CDS_INIT_LIST_HEAD(&event->enablers_ref_head);
event->desc = desc;
else
uri = NULL;
- /* Don't register metadata events */
- if (session->metadata == chan) {
- event->id = -1U;
- } else {
- /* Fetch event ID from sessiond */
- ret = ustcomm_register_event(notify_socket,
- session->objd,
- chan->objd,
- event_name,
- loglevel,
- desc->signature,
- desc->nr_fields,
- desc->fields,
- uri,
- &event->id);
- if (ret < 0) {
- goto sessiond_register_error;
- }
+ /* Fetch event ID from sessiond */
+ ret = ustcomm_register_event(notify_socket,
+ session,
+ session->objd,
+ chan->objd,
+ desc->name,
+ loglevel,
+ desc->signature,
+ desc->nr_fields,
+ desc->fields,
+ uri,
+ &event->id);
+ if (ret < 0) {
+ DBG("Error (%d) registering event to sessiond", ret);
+ goto sessiond_register_error;
}
- /* Populate lttng_event structure before tracepoint registration. */
- cmm_smp_wmb();
- ret = __tracepoint_probe_register(event_name,
- desc->probe_callback,
- event, desc->signature);
- if (ret)
- goto tracepoint_register_error;
-
cds_list_add(&event->node, &chan->session->events_head);
cds_hlist_add_head(&event->hlist, head);
return 0;
-tracepoint_register_error:
sessiond_register_error:
free(event);
cache_error:
+create_enum_error:
socket_error:
-exist:
return ret;
}
static
-int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc,
+int lttng_event_notifier_create(const struct lttng_event_desc *desc,
+ uint64_t token, uint64_t error_counter_index,
+ struct lttng_event_notifier_group *event_notifier_group)
+{
+ struct lttng_event_notifier *event_notifier;
+ struct cds_hlist_head *head;
+ int ret = 0;
+
+ /*
+ * Get the hashtable bucket the created lttng_event_notifier object
+ * should be inserted.
+ */
+ head = borrow_hash_table_bucket(
+ event_notifier_group->event_notifiers_ht.table,
+ LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc);
+
+ event_notifier = zmalloc(sizeof(struct lttng_event_notifier));
+ if (!event_notifier) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ event_notifier->group = event_notifier_group;
+ event_notifier->user_token = token;
+ event_notifier->error_counter_index = error_counter_index;
+
+ /* Event notifier will be enabled by enabler sync. */
+ event_notifier->enabled = 0;
+ event_notifier->registered = 0;
+
+ CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head);
+ CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head);
+ CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head);
+ event_notifier->desc = desc;
+ event_notifier->notification_send = lttng_event_notifier_notification_send;
+
+ cds_list_add(&event_notifier->node,
+ &event_notifier_group->event_notifiers_head);
+ cds_hlist_add_head(&event_notifier->hlist, head);
+
+ return 0;
+
+error:
+ return ret;
+}
+
+static
+void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
+{
+ struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
+
+ /* Remove from event_notifier list. */
+ cds_list_del(&event_notifier->node);
+ /* Remove from event_notifier hash table. */
+ cds_hlist_del(&event_notifier->hlist);
+
+ lttng_free_event_notifier_filter_runtime(event_notifier);
+
+ /* Free event_notifier enabler refs */
+ cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
+ &event_notifier->enablers_ref_head, node)
+ free(enabler_ref);
+ free(event_notifier);
+}
+
+static
+int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc,
struct lttng_enabler *enabler)
{
int loglevel = 0;
- unsigned int has_loglevel;
+ unsigned int has_loglevel = 0;
- assert(enabler->type == LTTNG_ENABLER_WILDCARD);
- /* Compare excluding final '*' */
- if (strncmp(desc->name, enabler->event_param.name,
- strlen(enabler->event_param.name) - 1))
+ assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB);
+ if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX,
+ desc->name, SIZE_MAX))
return 0;
if (desc->loglevel) {
loglevel = *(*desc->loglevel);
int loglevel = 0;
unsigned int has_loglevel = 0;
- assert(enabler->type == LTTNG_ENABLER_EVENT);
+ assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT);
if (strcmp(desc->name, enabler->event_param.name))
return 0;
if (desc->loglevel) {
int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
struct lttng_enabler *enabler)
{
- switch (enabler->type) {
- case LTTNG_ENABLER_WILDCARD:
- return lttng_desc_match_wildcard_enabler(desc, enabler);
- case LTTNG_ENABLER_EVENT:
+ switch (enabler->format_type) {
+ case LTTNG_ENABLER_FORMAT_STAR_GLOB:
+ {
+ struct lttng_ust_excluder_node *excluder;
+
+ if (!lttng_desc_match_star_glob_enabler(desc, enabler)) {
+ return 0;
+ }
+
+ /*
+ * If the matching event matches with an excluder,
+ * return 'does not match'
+ */
+ cds_list_for_each_entry(excluder, &enabler->excluder_head, node) {
+ int count;
+
+ for (count = 0; count < excluder->excluder.count; count++) {
+ int len;
+ char *excluder_name;
+
+ excluder_name = (char *) (excluder->excluder.names)
+ + count * LTTNG_UST_SYM_NAME_LEN;
+ len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN);
+ if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX))
+ return 0;
+ }
+ }
+ return 1;
+ }
+ case LTTNG_ENABLER_FORMAT_EVENT:
return lttng_desc_match_event_enabler(desc, enabler);
default:
return -EINVAL;
}
static
-int lttng_event_match_enabler(struct lttng_event *event,
- struct lttng_enabler *enabler)
+int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
+ struct lttng_event *event)
{
- return lttng_desc_match_enabler(event->desc, enabler);
+ if (lttng_desc_match_enabler(event->desc,
+ lttng_event_enabler_as_enabler(event_enabler))
+ && event->chan == event_enabler->chan)
+ return 1;
+ else
+ return 0;
+}
+
+static
+int lttng_event_notifier_enabler_match_event_notifier(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_event_notifier *event_notifier)
+{
+ int desc_matches = lttng_desc_match_enabler(event_notifier->desc,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
+
+ if (desc_matches && event_notifier->group == event_notifier_enabler->group &&
+ event_notifier->user_token == event_notifier_enabler->user_token)
+ return 1;
+ else
+ return 0;
}
static
-struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event,
+struct lttng_enabler_ref *lttng_enabler_ref(
+ struct cds_list_head *enabler_ref_list,
struct lttng_enabler *enabler)
{
struct lttng_enabler_ref *enabler_ref;
- cds_list_for_each_entry(enabler_ref,
- &event->enablers_ref_head, node) {
+ cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) {
if (enabler_ref->ref == enabler)
return enabler_ref;
}
* tracepoint probes.
*/
static
-void lttng_create_event_if_missing(struct lttng_enabler *enabler)
+void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
{
- struct lttng_session *session = enabler->chan->session;
+ struct lttng_session *session = event_enabler->chan->session;
struct lttng_probe_desc *probe_desc;
const struct lttng_event_desc *desc;
struct lttng_event *event;
*/
cds_list_for_each_entry(probe_desc, probe_list, head) {
for (i = 0; i < probe_desc->nr_events; i++) {
- int found = 0, ret;
+ int ret;
+ bool found = false;
struct cds_hlist_head *head;
struct cds_hlist_node *node;
- const char *event_name;
- size_t name_len;
- uint32_t hash;
desc = probe_desc->event_desc[i];
- if (!lttng_desc_match_enabler(desc, enabler))
+ if (!lttng_desc_match_enabler(desc,
+ lttng_event_enabler_as_enabler(event_enabler)))
continue;
- event_name = desc->name;
- name_len = strlen(event_name);
- /*
- * Check if already created.
- */
- hash = jhash(event_name, name_len, 0);
- head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
+ head = borrow_hash_table_bucket(
+ session->events_ht.table,
+ LTTNG_UST_EVENT_HT_SIZE, desc);
+
cds_hlist_for_each_entry(event, node, head, hlist) {
- if (event->desc == desc)
- found = 1;
+ if (event->desc == desc
+ && event->chan == event_enabler->chan) {
+ found = true;
+ break;
+ }
}
if (found)
continue;
* event probe.
*/
ret = lttng_event_create(probe_desc->event_desc[i],
- enabler->chan);
+ event_enabler->chan);
if (ret) {
DBG("Unable to create event %s, error %d\n",
probe_desc->event_desc[i]->name, ret);
}
}
+static
+void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc,
+ void (*event_func)(struct lttng_session *session,
+ struct lttng_event *event),
+ void (*event_notifier_func)(struct lttng_event_notifier *event_notifier))
+{
+ struct cds_hlist_node *node, *tmp_node;
+ struct cds_list_head *sessionsp;
+ unsigned int i;
+
+ /* Get handle on list of sessions. */
+ sessionsp = _lttng_get_sessions();
+
+ /*
+ * Iterate over all events in the probe provider descriptions and
+ * sessions to queue the unregistration of the events.
+ */
+ for (i = 0; i < provider_desc->nr_events; i++) {
+ const struct lttng_event_desc *event_desc;
+ struct lttng_event_notifier_group *event_notifier_group;
+ struct lttng_event_notifier *event_notifier;
+ struct lttng_session *session;
+ struct cds_hlist_head *head;
+ struct lttng_event *event;
+
+ event_desc = provider_desc->event_desc[i];
+
+ /*
+ * Iterate over all session to find the current event
+ * description.
+ */
+ cds_list_for_each_entry(session, sessionsp, node) {
+ /*
+ * Get the list of events in the hashtable bucket and
+ * iterate to find the event matching this descriptor.
+ */
+ head = borrow_hash_table_bucket(
+ session->events_ht.table,
+ LTTNG_UST_EVENT_HT_SIZE, event_desc);
+
+ cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) {
+ if (event_desc == event->desc) {
+ event_func(session, event);
+ break;
+ }
+ }
+ }
+
+ /*
+ * Iterate over all event_notifier groups to find the current event
+ * description.
+ */
+ cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
+ /*
+ * Get the list of event_notifiers in the hashtable bucket and
+ * iterate to find the event_notifier matching this
+ * descriptor.
+ */
+ head = borrow_hash_table_bucket(
+ event_notifier_group->event_notifiers_ht.table,
+ LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc);
+
+ cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) {
+ if (event_desc == event_notifier->desc) {
+ event_notifier_func(event_notifier);
+ break;
+ }
+ }
+ }
+ }
+}
+
+static
+void _unregister_event(struct lttng_session *session,
+ struct lttng_event *event)
+{
+ _lttng_event_unregister(event);
+}
+
+static
+void _event_enum_destroy(struct lttng_session *session,
+ struct lttng_event *event)
+{
+ unsigned int i;
+
+ /* Destroy enums of the current event. */
+ for (i = 0; i < event->desc->nr_fields; i++) {
+ const struct lttng_enum_desc *enum_desc;
+ const struct lttng_event_field *field;
+ struct lttng_enum *curr_enum;
+
+ field = &(event->desc->fields[i]);
+ switch (field->type.atype) {
+ case atype_enum:
+ enum_desc = field->type.u.legacy.basic.enumeration.desc;
+ break;
+ case atype_enum_nestable:
+ enum_desc = field->type.u.enum_nestable.desc;
+ break;
+ default:
+ continue;
+ }
+
+ curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc);
+ if (curr_enum) {
+ _lttng_enum_destroy(curr_enum);
+ }
+ }
+
+ /* Destroy event. */
+ _lttng_event_destroy(event);
+}
+
/*
- * Create events associated with an enabler (if not already present),
+ * Iterate over all the UST sessions to unregister and destroy all probes from
+ * the probe provider descriptor received as argument. Must me called with the
+ * ust_lock held.
+ */
+void lttng_probe_provider_unregister_events(
+ struct lttng_probe_desc *provider_desc)
+{
+ /*
+ * Iterate over all events in the probe provider descriptions and sessions
+ * to queue the unregistration of the events.
+ */
+ probe_provider_event_for_each(provider_desc, _unregister_event,
+ _lttng_event_notifier_unregister);
+
+ /* Wait for grace period. */
+ lttng_ust_synchronize_trace();
+ /* Prune the unregistration queue. */
+ __tracepoint_probe_prune_release_queue();
+
+ /*
+ * It is now safe to destroy the events and remove them from the event list
+ * and hashtables.
+ */
+ probe_provider_event_for_each(provider_desc, _event_enum_destroy,
+ _lttng_event_notifier_destroy);
+}
+
+/*
+ * Create events associated with an event enabler (if not already present),
* and add backward reference from the event to the enabler.
*/
static
-int lttng_enabler_ref_events(struct lttng_enabler *enabler)
+int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
{
- struct lttng_session *session = enabler->chan->session;
+ struct lttng_session *session = event_enabler->chan->session;
struct lttng_event *event;
+ if (!lttng_event_enabler_as_enabler(event_enabler)->enabled)
+ goto end;
+
/* First ensure that probe events are created for this enabler. */
- lttng_create_event_if_missing(enabler);
+ lttng_create_event_if_missing(event_enabler);
/* For each event matching enabler in session event list. */
cds_list_for_each_entry(event, &session->events_head, node) {
struct lttng_enabler_ref *enabler_ref;
- if (!lttng_event_match_enabler(event, enabler))
+ if (!lttng_event_enabler_match_event(event_enabler, event))
continue;
- enabler_ref = lttng_event_enabler_ref(event, enabler);
+ enabler_ref = lttng_enabler_ref(&event->enablers_ref_head,
+ lttng_event_enabler_as_enabler(event_enabler));
if (!enabler_ref) {
/*
* If no backward ref, create it.
enabler_ref = zmalloc(sizeof(*enabler_ref));
if (!enabler_ref)
return -ENOMEM;
- enabler_ref->ref = enabler;
+ enabler_ref->ref = lttng_event_enabler_as_enabler(
+ event_enabler);
cds_list_add(&enabler_ref->node,
&event->enablers_ref_head);
}
/*
* Link filter bytecodes if not linked yet.
*/
- lttng_enabler_event_link_bytecode(event, enabler);
+ lttng_enabler_link_bytecode(event->desc,
+ &session->ctx,
+ &event->filter_bytecode_runtime_head,
+ <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
/* TODO: merge event context. */
}
+end:
return 0;
}
/*
* Called at library load: connect the probe on all enablers matching
* this event.
- * called with session mutex held.
- * TODO: currently, for each desc added, we iterate on all event desc
- * (inefficient). We should create specific code that only target the
- * added desc.
+ * Called with session mutex held.
*/
-int lttng_fix_pending_event_desc(const struct lttng_event_desc *desc)
+int lttng_fix_pending_events(void)
{
struct lttng_session *session;
cds_list_for_each_entry(session, &sessions, node) {
- lttng_session_lazy_sync_enablers(session);
+ lttng_session_lazy_sync_event_enablers(session);
+ }
+ return 0;
+}
+
+int lttng_fix_pending_event_notifiers(void)
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+
+ cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
+ lttng_event_notifier_group_sync_enablers(event_notifier_group);
}
return 0;
}
/*
- * Only used internally at session destruction.
+ * For each session of the owner thread, execute pending statedump.
+ * Only dump state for the sessions owned by the caller thread, because
+ * we don't keep ust_lock across the entire iteration.
*/
-int _lttng_event_unregister(struct lttng_event *event)
+void lttng_handle_pending_statedump(void *owner)
{
- return __tracepoint_probe_unregister(event->desc->name,
- event->desc->probe_callback,
- event);
+ struct lttng_session *session;
+
+ /* Execute state dump */
+ do_lttng_ust_statedump(owner);
+
+ /* Clear pending state dump */
+ if (ust_lock()) {
+ goto end;
+ }
+ cds_list_for_each_entry(session, &sessions, node) {
+ if (session->owner != owner)
+ continue;
+ if (!session->statedump_pending)
+ continue;
+ session->statedump_pending = 0;
+ }
+end:
+ ust_unlock();
+ return;
}
/*
{
struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
+ /* Remove from event list. */
cds_list_del(&event->node);
+ /* Remove from event hash table. */
+ cds_hlist_del(&event->hlist);
+
lttng_destroy_context(event->ctx);
lttng_free_event_filter_runtime(event);
/* Free event enabler refs */
free(event);
}
-/*
- * We have exclusive access to our metadata buffer (protected by the
- * ust_lock), so we can do racy operations such as looking for
- * remaining space left in packet and write, since mutual exclusion
- * protects us from concurrent writes.
- */
-int lttng_metadata_printf(struct lttng_session *session,
- const char *fmt, ...)
-{
- struct lttng_ust_lib_ring_buffer_ctx ctx;
- struct lttng_channel *chan = session->metadata;
- char *str = NULL;
- int ret = 0, waitret;
- size_t len, reserve_len, pos;
- va_list ap;
-
- WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active));
-
- va_start(ap, fmt);
- ret = vasprintf(&str, fmt, ap);
- va_end(ap);
- if (ret < 0)
- return -ENOMEM;
-
- len = strlen(str);
- pos = 0;
-
- for (pos = 0; pos < len; pos += reserve_len) {
- reserve_len = min_t(size_t,
- chan->ops->packet_avail_size(chan->chan, chan->handle),
- len - pos);
- lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len,
- sizeof(char), -1, chan->handle);
- /*
- * We don't care about metadata buffer's records lost
- * count, because we always retry here. Report error if
- * we need to bail out after timeout or being
- * interrupted.
- */
- waitret = wait_cond_interruptible_timeout(
- ({
- ret = chan->ops->event_reserve(&ctx, 0);
- ret != -ENOBUFS || !ret;
- }),
- LTTNG_METADATA_TIMEOUT_MSEC);
- if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) {
- DBG("LTTng: Failure to write metadata to buffers (%s)\n",
- waitret == -EINTR ? "interrupted" :
- (ret == -ENOBUFS ? "timeout" : "I/O error"));
- if (waitret == -EINTR)
- ret = waitret;
- goto end;
- }
- chan->ops->event_write(&ctx, &str[pos], reserve_len);
- chan->ops->event_commit(&ctx);
- }
-end:
- free(str);
- return ret;
-}
-
static
-int _lttng_field_statedump(struct lttng_session *session,
- const struct lttng_event_field *field)
+void _lttng_enum_destroy(struct lttng_enum *_enum)
{
- int ret = 0;
-
- if (field->nowrite)
- return 0;
-
- switch (field->type.atype) {
- case atype_integer:
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
- field->type.u.basic.integer.size,
- field->type.u.basic.integer.alignment,
- field->type.u.basic.integer.signedness,
- (field->type.u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : (field->type.u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII",
- field->type.u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name);
- break;
- case atype_float:
- ret = lttng_metadata_printf(session,
- " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n",
- field->type.u.basic._float.exp_dig,
- field->type.u.basic._float.mant_dig,
- field->type.u.basic._float.alignment,
-#if (BYTE_ORDER == BIG_ENDIAN)
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name);
- break;
- case atype_enum:
- ret = lttng_metadata_printf(session,
- " %s %s;\n",
- field->type.u.basic.enumeration.name,
- field->name);
- break;
- case atype_array:
- {
- const struct lttng_basic_type *elem_type;
-
- elem_type = &field->type.u.array.elem_type;
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
- elem_type->u.basic.integer.size,
- elem_type->u.basic.integer.alignment,
- elem_type->u.basic.integer.signedness,
- (elem_type->u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII",
- elem_type->u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name, field->type.u.array.length);
- break;
- }
- case atype_sequence:
- {
- const struct lttng_basic_type *elem_type;
- const struct lttng_basic_type *length_type;
-
- elem_type = &field->type.u.sequence.elem_type;
- length_type = &field->type.u.sequence.length_type;
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
- length_type->u.basic.integer.size,
- (unsigned int) length_type->u.basic.integer.alignment,
- length_type->u.basic.integer.signedness,
- (length_type->u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII"),
- length_type->u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name);
- if (ret)
- return ret;
-
- ret = lttng_metadata_printf(session,
- " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
- elem_type->u.basic.integer.size,
- (unsigned int) elem_type->u.basic.integer.alignment,
- elem_type->u.basic.integer.signedness,
- (elem_type->u.basic.integer.encoding == lttng_encode_none)
- ? "none"
- : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
- ? "UTF8"
- : "ASCII"),
- elem_type->u.basic.integer.base,
-#if (BYTE_ORDER == BIG_ENDIAN)
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
-#else
- elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
-#endif
- field->name,
- field->name);
- break;
- }
-
- case atype_string:
- /* Default encoding is UTF8 */
- ret = lttng_metadata_printf(session,
- " string%s _%s;\n",
- field->type.u.basic.string.encoding == lttng_encode_ASCII ?
- " { encoding = ASCII; }" : "",
- field->name);
- break;
- default:
- WARN_ON_ONCE(1);
- return -EINVAL;
- }
- return ret;
+ cds_list_del(&_enum->node);
+ cds_hlist_del(&_enum->hlist);
+ free(_enum);
}
-static
-int _lttng_context_metadata_statedump(struct lttng_session *session,
- struct lttng_ctx *ctx)
+void lttng_ust_events_exit(void)
{
- int ret = 0;
- int i;
-
- if (!ctx)
- return 0;
- for (i = 0; i < ctx->nr_fields; i++) {
- const struct lttng_ctx_field *field = &ctx->fields[i];
+ struct lttng_session *session, *tmpsession;
- ret = _lttng_field_statedump(session, &field->event_field);
- if (ret)
- return ret;
- }
- return ret;
+ cds_list_for_each_entry_safe(session, tmpsession, &sessions, node)
+ lttng_session_destroy(session);
}
-static
-int _lttng_fields_metadata_statedump(struct lttng_session *session,
- struct lttng_event *event)
+/*
+ * Enabler management.
+ */
+struct lttng_event_enabler *lttng_event_enabler_create(
+ enum lttng_enabler_format_type format_type,
+ struct lttng_ust_event *event_param,
+ struct lttng_channel *chan)
{
- const struct lttng_event_desc *desc = event->desc;
- int ret = 0;
- int i;
+ struct lttng_event_enabler *event_enabler;
- for (i = 0; i < desc->nr_fields; i++) {
- const struct lttng_event_field *field = &desc->fields[i];
+ event_enabler = zmalloc(sizeof(*event_enabler));
+ if (!event_enabler)
+ return NULL;
+ event_enabler->base.format_type = format_type;
+ CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
+ CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head);
+ memcpy(&event_enabler->base.event_param, event_param,
+ sizeof(event_enabler->base.event_param));
+ event_enabler->chan = chan;
+ /* ctx left NULL */
+ event_enabler->base.enabled = 0;
+ cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
+ lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
- ret = _lttng_field_statedump(session, field);
- if (ret)
- return ret;
- }
- return ret;
+ return event_enabler;
}
-static
-int _lttng_event_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan,
- struct lttng_event *event)
+struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
+ struct lttng_event_notifier_group *event_notifier_group,
+ enum lttng_enabler_format_type format_type,
+ struct lttng_ust_event_notifier *event_notifier_param)
{
- int ret = 0;
- int loglevel = TRACE_DEFAULT;
-
- if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
- return 0;
- if (chan == session->metadata)
- return 0;
- /*
- * Don't print events for which probe load is pending.
- */
- if (!event->desc)
- return 0;
-
- ret = lttng_metadata_printf(session,
- "event {\n"
- " name = \"%s\";\n"
- " id = %u;\n"
- " stream_id = %u;\n",
- event->desc->name,
- event->id,
- event->chan->id);
- if (ret)
- goto end;
-
- if (event->desc->loglevel)
- loglevel = *(*event->desc->loglevel);
-
- ret = lttng_metadata_printf(session,
- " loglevel = %d;\n",
- loglevel);
- if (ret)
- goto end;
-
- if (event->desc->u.ext.model_emf_uri) {
- ret = lttng_metadata_printf(session,
- " model.emf.uri = \"%s\";\n",
- *(event->desc->u.ext.model_emf_uri));
- if (ret)
- goto end;
- }
-
- if (event->ctx) {
- ret = lttng_metadata_printf(session,
- " context := struct {\n");
- if (ret)
- goto end;
- }
- ret = _lttng_context_metadata_statedump(session, event->ctx);
- if (ret)
- goto end;
- if (event->ctx) {
- ret = lttng_metadata_printf(session,
- " };\n");
- if (ret)
- goto end;
- }
-
- ret = lttng_metadata_printf(session,
- " fields := struct {\n"
- );
- if (ret)
- goto end;
-
- ret = _lttng_fields_metadata_statedump(session, event);
- if (ret)
- goto end;
-
- /*
- * LTTng space reservation can only reserve multiples of the
- * byte size.
- */
- ret = lttng_metadata_printf(session,
- " };\n"
- "};\n\n");
- if (ret)
- goto end;
-
- event->metadata_dumped = 1;
-end:
- return ret;
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler));
+ if (!event_notifier_enabler)
+ return NULL;
+ event_notifier_enabler->base.format_type = format_type;
+ CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
+ CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
+ CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head);
+
+ event_notifier_enabler->user_token = event_notifier_param->event.token;
+ event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index;
+ event_notifier_enabler->num_captures = 0;
+
+ memcpy(&event_notifier_enabler->base.event_param.name,
+ event_notifier_param->event.name,
+ sizeof(event_notifier_enabler->base.event_param.name));
+ event_notifier_enabler->base.event_param.instrumentation =
+ event_notifier_param->event.instrumentation;
+ event_notifier_enabler->base.event_param.loglevel =
+ event_notifier_param->event.loglevel;
+ event_notifier_enabler->base.event_param.loglevel_type =
+ event_notifier_param->event.loglevel_type;
+
+ event_notifier_enabler->base.enabled = 0;
+ event_notifier_enabler->group = event_notifier_group;
+
+ cds_list_add(&event_notifier_enabler->node,
+ &event_notifier_group->enablers_head);
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_group);
+
+ return event_notifier_enabler;
}
-static
-int _lttng_channel_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan)
+int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
{
- int ret = 0;
-
- if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
- return 0;
- if (chan == session->metadata)
- return 0;
-
- WARN_ON_ONCE(!chan->header_type);
- ret = lttng_metadata_printf(session,
- "stream {\n"
- " id = %u;\n"
- " event.header := %s;\n"
- " packet.context := struct packet_context;\n",
- chan->id,
- chan->header_type == 1 ? "struct event_header_compact" :
- "struct event_header_large");
- if (ret)
- goto end;
-
- if (chan->ctx) {
- ret = lttng_metadata_printf(session,
- " event.context := struct {\n");
- if (ret)
- goto end;
- }
- ret = _lttng_context_metadata_statedump(session, chan->ctx);
- if (ret)
- goto end;
- if (chan->ctx) {
- ret = lttng_metadata_printf(session,
- " };\n");
- if (ret)
- goto end;
- }
+ lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
+ lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
- ret = lttng_metadata_printf(session,
- "};\n\n");
-
- chan->metadata_dumped = 1;
-end:
- return ret;
+ return 0;
}
-static
-int _lttng_stream_packet_context_declare(struct lttng_session *session)
+int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
{
- return lttng_metadata_printf(session,
- "struct packet_context {\n"
- " uint64_clock_monotonic_t timestamp_begin;\n"
- " uint64_clock_monotonic_t timestamp_end;\n"
- " uint64_t content_size;\n"
- " uint64_t packet_size;\n"
- " unsigned long events_discarded;\n"
- " uint32_t cpu_id;\n"
- "};\n\n"
- );
+ lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
+ lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+
+ return 0;
}
-/*
- * Compact header:
- * id: range: 0 - 30.
- * id 31 is reserved to indicate an extended header.
- *
- * Large header:
- * id: range: 0 - 65534.
- * id 65535 is reserved to indicate an extended header.
- */
static
-int _lttng_event_header_declare(struct lttng_session *session)
-{
- return lttng_metadata_printf(session,
- "struct event_header_compact {\n"
- " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
- " variant <id> {\n"
- " struct {\n"
- " uint27_clock_monotonic_t timestamp;\n"
- " } compact;\n"
- " struct {\n"
- " uint32_t id;\n"
- " uint64_clock_monotonic_t timestamp;\n"
- " } extended;\n"
- " } v;\n"
- "} align(%u);\n"
- "\n"
- "struct event_header_large {\n"
- " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
- " variant <id> {\n"
- " struct {\n"
- " uint32_clock_monotonic_t timestamp;\n"
- " } compact;\n"
- " struct {\n"
- " uint32_t id;\n"
- " uint64_clock_monotonic_t timestamp;\n"
- " } extended;\n"
- " } v;\n"
- "} align(%u);\n\n",
- lttng_alignof(uint32_t) * CHAR_BIT,
- lttng_alignof(uint16_t) * CHAR_BIT
- );
+void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
+ struct lttng_ust_bytecode_node **bytecode)
+{
+ (*bytecode)->enabler = enabler;
+ cds_list_add_tail(&(*bytecode)->node, &enabler->filter_bytecode_head);
+ /* Take ownership of bytecode */
+ *bytecode = NULL;
}
-/*
- * Approximation of NTP time of day to clock monotonic correlation,
- * taken at start of trace.
- * Yes, this is only an approximation. Yes, we can (and will) do better
- * in future versions.
- */
-static
-uint64_t measure_clock_offset(void)
+int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
+ struct lttng_ust_bytecode_node **bytecode)
{
- uint64_t offset, monotonic[2], realtime;
- struct timespec rts = { 0, 0 };
- int ret;
+ _lttng_enabler_attach_filter_bytecode(
+ lttng_event_enabler_as_enabler(event_enabler), bytecode);
- monotonic[0] = trace_clock_read64();
- ret = clock_gettime(CLOCK_REALTIME, &rts);
- if (ret < 0)
- return 0;
- monotonic[1] = trace_clock_read64();
- offset = (monotonic[0] + monotonic[1]) >> 1;
- realtime = (uint64_t) rts.tv_sec * 1000000000ULL;
- realtime += rts.tv_nsec;
- offset = realtime - offset;
- return offset;
+ lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+ return 0;
}
-/*
- * Output metadata into this session's metadata buffers.
- */
static
-int _lttng_session_metadata_statedump(struct lttng_session *session)
+void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
+ struct lttng_ust_excluder_node **excluder)
{
- unsigned char *uuid_c;
- char uuid_s[LTTNG_UST_UUID_STR_LEN],
- clock_uuid_s[LTTNG_UST_UUID_STR_LEN];
- struct lttng_channel *chan;
- struct lttng_event *event;
- int ret = 0;
- char procname[LTTNG_UST_PROCNAME_LEN] = "";
- char hostname[HOST_NAME_MAX];
-
- if (!CMM_ACCESS_ONCE(session->active))
- return 0;
- if (session->metadata_dumped)
- goto skip_session;
- if (!session->metadata) {
- DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n");
- return -EPERM;
- }
- uuid_c = session->metadata->uuid;
-
- snprintf(uuid_s, sizeof(uuid_s),
- "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
- uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
- uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
- uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
- uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
-
- ret = lttng_metadata_printf(session,
- "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
- "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
- "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
- "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
- "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
- "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
- "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
- "\n"
- "trace {\n"
- " major = %u;\n"
- " minor = %u;\n"
- " uuid = \"%s\";\n"
- " byte_order = %s;\n"
- " packet.header := struct {\n"
- " uint32_t magic;\n"
- " uint8_t uuid[16];\n"
- " uint32_t stream_id;\n"
- " };\n"
- "};\n\n",
- lttng_alignof(uint8_t) * CHAR_BIT,
- lttng_alignof(uint16_t) * CHAR_BIT,
- lttng_alignof(uint32_t) * CHAR_BIT,
- lttng_alignof(uint64_t) * CHAR_BIT,
- sizeof(unsigned long) * CHAR_BIT,
- lttng_alignof(unsigned long) * CHAR_BIT,
- CTF_SPEC_MAJOR,
- CTF_SPEC_MINOR,
- uuid_s,
-#if (BYTE_ORDER == BIG_ENDIAN)
- "be"
-#else
- "le"
-#endif
- );
- if (ret)
- goto end;
-
- /* ignore error, just use empty string if error. */
- hostname[0] = '\0';
- ret = gethostname(hostname, sizeof(hostname));
- if (ret && errno == ENAMETOOLONG)
- hostname[HOST_NAME_MAX - 1] = '\0';
- lttng_ust_getprocname(procname);
- procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0';
- ret = lttng_metadata_printf(session,
- "env {\n"
- " hostname = \"%s\";\n"
- " vpid = %d;\n"
- " procname = \"%s\";\n"
- " domain = \"ust\";\n"
- " tracer_name = \"lttng-ust\";\n"
- " tracer_major = %u;\n"
- " tracer_minor = %u;\n"
- " tracer_patchlevel = %u;\n"
- "};\n\n",
- hostname,
- (int) getpid(),
- procname,
- LTTNG_UST_MAJOR_VERSION,
- LTTNG_UST_MINOR_VERSION,
- LTTNG_UST_PATCHLEVEL_VERSION
- );
- if (ret)
- goto end;
-
- ret = lttng_metadata_printf(session,
- "clock {\n"
- " name = %s;\n",
- "monotonic"
- );
- if (ret)
- goto end;
-
- if (!trace_clock_uuid(clock_uuid_s)) {
- ret = lttng_metadata_printf(session,
- " uuid = \"%s\";\n",
- clock_uuid_s
- );
- if (ret)
- goto end;
- }
-
- ret = lttng_metadata_printf(session,
- " description = \"Monotonic Clock\";\n"
- " freq = %" PRIu64 "; /* Frequency, in Hz */\n"
- " /* clock value offset from Epoch is: offset * (1/freq) */\n"
- " offset = %" PRIu64 ";\n"
- "};\n\n",
- trace_clock_freq(),
- measure_clock_offset()
- );
- if (ret)
- goto end;
-
- ret = lttng_metadata_printf(session,
- "typealias integer {\n"
- " size = 27; align = 1; signed = false;\n"
- " map = clock.monotonic.value;\n"
- "} := uint27_clock_monotonic_t;\n"
- "\n"
- "typealias integer {\n"
- " size = 32; align = %u; signed = false;\n"
- " map = clock.monotonic.value;\n"
- "} := uint32_clock_monotonic_t;\n"
- "\n"
- "typealias integer {\n"
- " size = 64; align = %u; signed = false;\n"
- " map = clock.monotonic.value;\n"
- "} := uint64_clock_monotonic_t;\n\n",
- lttng_alignof(uint32_t) * CHAR_BIT,
- lttng_alignof(uint64_t) * CHAR_BIT
- );
- if (ret)
- goto end;
-
- ret = _lttng_stream_packet_context_declare(session);
- if (ret)
- goto end;
-
- ret = _lttng_event_header_declare(session);
- if (ret)
- goto end;
+ (*excluder)->enabler = enabler;
+ cds_list_add_tail(&(*excluder)->node, &enabler->excluder_head);
+ /* Take ownership of excluder */
+ *excluder = NULL;
+}
-skip_session:
- cds_list_for_each_entry(chan, &session->chan_head, node) {
- ret = _lttng_channel_metadata_statedump(session, chan);
- if (ret)
- goto end;
- }
+int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler,
+ struct lttng_ust_excluder_node **excluder)
+{
+ _lttng_enabler_attach_exclusion(
+ lttng_event_enabler_as_enabler(event_enabler), excluder);
- cds_list_for_each_entry(event, &session->events_head, node) {
- ret = _lttng_event_metadata_statedump(session, event->chan, event);
- if (ret)
- goto end;
- }
- session->metadata_dumped = 1;
-end:
- return ret;
+ lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
+ return 0;
}
-void lttng_ust_events_exit(void)
+int lttng_event_notifier_enabler_enable(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
{
- struct lttng_session *session, *tmpsession;
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
- cds_list_for_each_entry_safe(session, tmpsession, &sessions, node)
- lttng_session_destroy(session);
+ return 0;
}
-/*
- * Enabler management.
- */
-struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
- struct lttng_ust_event *event_param,
- struct lttng_channel *chan)
+int lttng_event_notifier_enabler_disable(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
{
- struct lttng_enabler *enabler;
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
- enabler = zmalloc(sizeof(*enabler));
- if (!enabler)
- return NULL;
- enabler->type = type;
- CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head);
- memcpy(&enabler->event_param, event_param,
- sizeof(enabler->event_param));
- enabler->chan = chan;
- /* ctx left NULL */
- enabler->enabled = 1;
- cds_list_add(&enabler->node, &enabler->chan->session->enablers_head);
- lttng_session_lazy_sync_enablers(enabler->chan->session);
- return enabler;
+ return 0;
}
-int lttng_enabler_enable(struct lttng_enabler *enabler)
+int lttng_event_notifier_enabler_attach_filter_bytecode(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_ust_bytecode_node **bytecode)
{
- enabler->enabled = 1;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
+ _lttng_enabler_attach_filter_bytecode(
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
+ bytecode);
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
return 0;
}
-int lttng_enabler_disable(struct lttng_enabler *enabler)
+int lttng_event_notifier_enabler_attach_capture_bytecode(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_ust_bytecode_node **bytecode)
{
- if (enabler->chan == enabler->chan->session->metadata)
- return -EPERM;
- enabler->enabled = 0;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
+ (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+ cds_list_add_tail(&(*bytecode)->node,
+ &event_notifier_enabler->capture_bytecode_head);
+ /* Take ownership of bytecode */
+ *bytecode = NULL;
+ event_notifier_enabler->num_captures++;
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
return 0;
}
-int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
- struct lttng_ust_filter_bytecode_node *bytecode)
+int lttng_event_notifier_enabler_attach_exclusion(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ struct lttng_ust_excluder_node **excluder)
{
- bytecode->enabler = enabler;
- cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head);
- lttng_session_lazy_sync_enablers(enabler->chan->session);
+ _lttng_enabler_attach_exclusion(
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
+ excluder);
+
+ lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
return 0;
}
int lttng_attach_context(struct lttng_ust_context *context_param,
+ union ust_args *uargs,
struct lttng_ctx **ctx, struct lttng_session *session)
{
/*
switch (context_param->ctx) {
case LTTNG_UST_CONTEXT_PTHREAD_ID:
return lttng_add_pthread_id_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER:
+ {
+ struct lttng_ust_perf_counter_ctx *perf_ctx_param;
+
+ perf_ctx_param = &context_param->u.perf_counter;
+ return lttng_add_perf_counter_to_ctx(
+ perf_ctx_param->type,
+ perf_ctx_param->config,
+ perf_ctx_param->name,
+ ctx);
+ }
case LTTNG_UST_CONTEXT_VTID:
return lttng_add_vtid_to_ctx(ctx);
case LTTNG_UST_CONTEXT_VPID:
return lttng_add_vpid_to_ctx(ctx);
case LTTNG_UST_CONTEXT_PROCNAME:
return lttng_add_procname_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_IP:
+ return lttng_add_ip_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_CPU_ID:
+ return lttng_add_cpu_id_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_APP_CONTEXT:
+ return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname,
+ ctx);
+ case LTTNG_UST_CONTEXT_CGROUP_NS:
+ return lttng_add_cgroup_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_IPC_NS:
+ return lttng_add_ipc_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_MNT_NS:
+ return lttng_add_mnt_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_NET_NS:
+ return lttng_add_net_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_PID_NS:
+ return lttng_add_pid_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_TIME_NS:
+ return lttng_add_time_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_USER_NS:
+ return lttng_add_user_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_UTS_NS:
+ return lttng_add_uts_ns_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VUID:
+ return lttng_add_vuid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VEUID:
+ return lttng_add_veuid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VSUID:
+ return lttng_add_vsuid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VGID:
+ return lttng_add_vgid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VEGID:
+ return lttng_add_vegid_to_ctx(ctx);
+ case LTTNG_UST_CONTEXT_VSGID:
+ return lttng_add_vsgid_to_ctx(ctx);
default:
return -EINVAL;
}
}
-int lttng_enabler_attach_context(struct lttng_enabler *enabler,
+int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler,
struct lttng_ust_context *context_param)
{
-#if 0 // disabled for now.
- struct lttng_session *session = enabler->chan->session;
- int ret;
-
- ret = lttng_attach_context(context_param, &enabler->ctx,
- session);
- if (ret)
- return ret;
- lttng_session_lazy_sync_enablers(enabler->chan->session);
-#endif
return -ENOSYS;
}
-static
-void lttng_enabler_destroy(struct lttng_enabler *enabler)
+void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
{
- struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node;
-
- /* Destroy filter bytecode */
- cds_list_for_each_entry_safe(filter_node, tmp_filter_node,
- &enabler->filter_bytecode_head, node) {
- free(filter_node);
+ if (!event_enabler) {
+ return;
}
+ cds_list_del(&event_enabler->node);
- /* Destroy contexts */
- lttng_destroy_context(enabler->ctx);
+ lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
- cds_list_del(&enabler->node);
- free(enabler);
+ lttng_destroy_context(event_enabler->ctx);
+ free(event_enabler);
}
/*
- * lttng_session_sync_enablers should be called just before starting a
+ * lttng_session_sync_event_enablers should be called just before starting a
* session.
*/
static
-void lttng_session_sync_enablers(struct lttng_session *session)
+void lttng_session_sync_event_enablers(struct lttng_session *session)
{
- struct lttng_enabler *enabler;
+ struct lttng_event_enabler *event_enabler;
struct lttng_event *event;
- cds_list_for_each_entry(enabler, &session->enablers_head, node)
- lttng_enabler_ref_events(enabler);
+ cds_list_for_each_entry(event_enabler, &session->enablers_head, node)
+ lttng_event_enabler_ref_events(event_enabler);
/*
* For each event, if at least one of its enablers is enabled,
- * we enable the event, else we disable it.
+ * and its channel and session transient states are enabled, we
+ * enable the event, else we disable it.
*/
cds_list_for_each_entry(event, &session->events_head, node) {
struct lttng_enabler_ref *enabler_ref;
break;
}
}
- event->enabled = enabled;
+ /*
+ * Enabled state is based on union of enablers, with
+ * intesection of session and channel transient enable
+ * states.
+ */
+ enabled = enabled && session->tstate && event->chan->tstate;
+
+ CMM_STORE_SHARED(event->enabled, enabled);
+ /*
+ * Sync tracepoint registration with event enabled
+ * state.
+ */
+ if (enabled) {
+ if (!event->registered)
+ register_event(event);
+ } else {
+ if (event->registered)
+ unregister_event(event);
+ }
/* Check if has enablers without bytecode enabled */
cds_list_for_each_entry(enabler_ref,
/* Enable filters */
cds_list_for_each_entry(runtime,
- &event->bytecode_runtime_head, node) {
- lttng_filter_sync_state(runtime);
+ &event->filter_bytecode_runtime_head, node) {
+ lttng_bytecode_filter_sync_state(runtime);
+ }
+ }
+ __tracepoint_probe_prune_release_queue();
+}
+
+/* Support for event notifier is introduced by probe provider major version 2. */
+static
+bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc)
+{
+ return probe_desc->major >= 2;
+}
+
+static
+void lttng_create_event_notifier_if_missing(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
+ struct lttng_probe_desc *probe_desc;
+ struct cds_list_head *probe_list;
+ int i;
+
+ probe_list = lttng_get_probe_list_head();
+
+ cds_list_for_each_entry(probe_desc, probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ int ret;
+ bool found = false;
+ const struct lttng_event_desc *desc;
+ struct lttng_event_notifier *event_notifier;
+ struct cds_hlist_head *head;
+ struct cds_hlist_node *node;
+
+ desc = probe_desc->event_desc[i];
+
+ if (!lttng_desc_match_enabler(desc,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
+ continue;
+
+ /*
+ * Given the current event_notifier group, get the bucket that
+ * the target event_notifier would be if it was already
+ * created.
+ */
+ head = borrow_hash_table_bucket(
+ event_notifier_group->event_notifiers_ht.table,
+ LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc);
+
+ cds_hlist_for_each_entry(event_notifier, node, head, hlist) {
+ /*
+ * Check if event_notifier already exists by checking
+ * if the event_notifier and enabler share the same
+ * description and id.
+ */
+ if (event_notifier->desc == desc &&
+ event_notifier->user_token == event_notifier_enabler->user_token) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found)
+ continue;
+
+ /* 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, "
+ "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->major,
+ probe_desc->minor);
+ continue;
+ }
+ /*
+ * We need to create a event_notifier for this event probe.
+ */
+ ret = lttng_event_notifier_create(desc,
+ event_notifier_enabler->user_token,
+ 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);
+ }
+ }
+ }
+}
+
+/*
+ * Create event_notifiers associated with a event_notifier enabler (if not already present).
+ */
+static
+int lttng_event_notifier_enabler_ref_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
+ struct lttng_event_notifier *event_notifier;
+
+ /*
+ * Only try to create event_notifiers for enablers that are enabled, the user
+ * might still be attaching filter or exclusion to the
+ * event_notifier_enabler.
+ */
+ if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled)
+ goto end;
+
+ /* First, ensure that probe event_notifiers are created for this enabler. */
+ lttng_create_event_notifier_if_missing(event_notifier_enabler);
+
+ /* Link the created event_notifier with its associated enabler. */
+ cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) {
+ struct lttng_enabler_ref *enabler_ref;
+
+ if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
+ continue;
+
+ enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head,
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
+ if (!enabler_ref) {
+ /*
+ * If no backward ref, create it.
+ * Add backward ref from event_notifier to enabler.
+ */
+ enabler_ref = zmalloc(sizeof(*enabler_ref));
+ if (!enabler_ref)
+ return -ENOMEM;
+
+ enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+ cds_list_add(&enabler_ref->node,
+ &event_notifier->enablers_ref_head);
+ }
+
+ /*
+ * Link filter bytecodes if not linked yet.
+ */
+ lttng_enabler_link_bytecode(event_notifier->desc,
+ &event_notifier_group->ctx,
+ &event_notifier->filter_bytecode_runtime_head,
+ <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
+
+ /*
+ * Link capture bytecodes if not linked yet.
+ */
+ lttng_enabler_link_bytecode(event_notifier->desc,
+ &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head,
+ &event_notifier_enabler->capture_bytecode_head);
+
+ event_notifier->num_captures = event_notifier_enabler->num_captures;
+ }
+end:
+ return 0;
+}
+
+static
+void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
+{
+ struct lttng_event_notifier_enabler *event_notifier_enabler;
+ struct lttng_event_notifier *event_notifier;
+
+ cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
+ lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
+
+ /*
+ * For each event_notifier, if at least one of its enablers is enabled,
+ * we enable the event_notifier, else we disable it.
+ */
+ cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) {
+ struct lttng_enabler_ref *enabler_ref;
+ struct lttng_bytecode_runtime *runtime;
+ int enabled = 0, has_enablers_without_bytecode = 0;
+
+ /* Enable event_notifiers */
+ cds_list_for_each_entry(enabler_ref,
+ &event_notifier->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled) {
+ enabled = 1;
+ break;
+ }
+ }
+
+ CMM_STORE_SHARED(event_notifier->enabled, enabled);
+ /*
+ * Sync tracepoint registration with event_notifier enabled
+ * state.
+ */
+ if (enabled) {
+ if (!event_notifier->registered)
+ register_event_notifier(event_notifier);
+ } else {
+ if (event_notifier->registered)
+ unregister_event_notifier(event_notifier);
+ }
+
+ /* Check if has enablers without bytecode enabled */
+ cds_list_for_each_entry(enabler_ref,
+ &event_notifier->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled
+ && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) {
+ has_enablers_without_bytecode = 1;
+ break;
+ }
+ }
+ event_notifier->has_enablers_without_bytecode =
+ has_enablers_without_bytecode;
+
+ /* Enable filters */
+ cds_list_for_each_entry(runtime,
+ &event_notifier->filter_bytecode_runtime_head, node) {
+ lttng_bytecode_filter_sync_state(runtime);
+ }
+
+ /* Enable captures. */
+ cds_list_for_each_entry(runtime,
+ &event_notifier->capture_bytecode_runtime_head, node) {
+ lttng_bytecode_capture_sync_state(runtime);
}
}
+ __tracepoint_probe_prune_release_queue();
}
/*
* "lazy" sync means we only sync if required.
*/
static
-void lttng_session_lazy_sync_enablers(struct lttng_session *session)
+void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
{
/* We can skip if session is not active */
if (!session->active)
return;
- lttng_session_sync_enablers(session);
+ lttng_session_sync_event_enablers(session);
+}
+
+/*
+ * Update all sessions with the given app context.
+ * Called with ust lock held.
+ * This is invoked when an application context gets loaded/unloaded. It
+ * ensures the context callbacks are in sync with the application
+ * context (either app context callbacks, or dummy callbacks).
+ */
+void lttng_ust_context_set_session_provider(const char *name,
+ size_t (*get_size)(struct lttng_ctx_field *field, size_t offset),
+ void (*record)(struct lttng_ctx_field *field,
+ struct lttng_ust_lib_ring_buffer_ctx *ctx,
+ struct lttng_channel *chan),
+ void (*get_value)(struct lttng_ctx_field *field,
+ struct lttng_ctx_value *value))
+{
+ struct lttng_session *session;
+
+ cds_list_for_each_entry(session, &sessions, node) {
+ struct lttng_channel *chan;
+ struct lttng_event *event;
+ int ret;
+
+ ret = lttng_ust_context_set_provider_rcu(&session->ctx,
+ name, get_size, record, get_value);
+ if (ret)
+ abort();
+ cds_list_for_each_entry(chan, &session->chan_head, node) {
+ ret = lttng_ust_context_set_provider_rcu(&chan->ctx,
+ name, get_size, record, get_value);
+ if (ret)
+ abort();
+ }
+ cds_list_for_each_entry(event, &session->events_head, node) {
+ ret = lttng_ust_context_set_provider_rcu(&event->ctx,
+ name, get_size, record, get_value);
+ if (ret)
+ abort();
+ }
+ }
+}
+
+/*
+ * Update all event_notifier groups with the given app context.
+ * Called with ust lock held.
+ * This is invoked when an application context gets loaded/unloaded. It
+ * ensures the context callbacks are in sync with the application
+ * context (either app context callbacks, or dummy callbacks).
+ */
+void lttng_ust_context_set_event_notifier_group_provider(const char *name,
+ size_t (*get_size)(struct lttng_ctx_field *field, size_t offset),
+ void (*record)(struct lttng_ctx_field *field,
+ struct lttng_ust_lib_ring_buffer_ctx *ctx,
+ struct lttng_channel *chan),
+ void (*get_value)(struct lttng_ctx_field *field,
+ struct lttng_ctx_value *value))
+{
+ struct lttng_event_notifier_group *event_notifier_group;
+
+ cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
+ int ret;
+
+ ret = lttng_ust_context_set_provider_rcu(
+ &event_notifier_group->ctx,
+ name, get_size, record, get_value);
+ if (ret)
+ abort();
+ }
}