*/
#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <stdio.h>
#include <urcu/list.h>
#include <urcu/hlist.h>
#include <stddef.h>
#include <inttypes.h>
#include <time.h>
+#include <stdbool.h>
#include <lttng/ust-endian.h>
#include "clock.h"
#include <usterr-signal-safe.h>
#include <helper.h>
+#include <lttng/ust-ctl.h>
+#include <ust-comm.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-tracer.h"
#include "lttng-tracer-core.h"
+#include "lttng-ust-statedump.h"
#include "wait.h"
#include "../libringbuffer/shm.h"
#include "jhash.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);
-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 void _lttng_enum_destroy(struct lttng_enum *_enum);
-/*
- * Wildcard list, containing the active wildcards.
- * Protected by ust lock.
- */
-static CDS_LIST_HEAD(wildcard_list);
+static
+void lttng_session_lazy_sync_enablers(struct lttng_session *session);
+static
+void lttng_session_sync_enablers(struct lttng_session *session);
+static
+void lttng_enabler_destroy(struct lttng_enabler *enabler);
/*
- * Pending probes hash table, containing the registered ltt events for
- * which tracepoint probes are still missing. Protected by the sessions
- * mutex.
+ * Called with ust lock held.
*/
-#define PENDING_PROBE_HASH_BITS 6
-#define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS)
-static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE];
+int lttng_session_active(void)
+{
+ struct lttng_session *iter;
-struct ust_pending_probe {
- struct lttng_event *event;
- struct cds_hlist_node node;
- enum lttng_ust_loglevel_type loglevel_type;
- int loglevel;
- char name[];
-};
+ cds_list_for_each_entry(iter, &sessions, node) {
+ if (iter->active)
+ return 1;
+ }
+ return 0;
+}
-static void _lttng_event_destroy(struct lttng_event *event);
-static void _lttng_wildcard_destroy(struct session_wildcard *sw);
-static void _lttng_channel_destroy(struct lttng_channel *chan);
-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);
-
-int lttng_loglevel_match(const struct lttng_event_desc *desc,
+int lttng_loglevel_match(int loglevel,
+ unsigned int has_loglevel,
enum lttng_ust_loglevel_type req_type,
int req_loglevel)
{
- int ev_loglevel;
-
- if (req_type == LTTNG_UST_LOGLEVEL_ALL)
- return 1;
- if (!desc->loglevel)
- ev_loglevel = TRACE_DEFAULT;
- else
- ev_loglevel = *(*desc->loglevel);
+ if (!has_loglevel)
+ loglevel = TRACE_DEFAULT;
switch (req_type) {
case LTTNG_UST_LOGLEVEL_RANGE:
- if (ev_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 (ev_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;
}
}
-/*
- * Return wildcard for a given event name if the event name match the
- * one of the wildcards.
- * Must be called with ust lock held.
- * Returns NULL if not present.
- */
-static
-struct wildcard_entry *match_wildcard(const struct lttng_event_desc *desc)
+void synchronize_trace(void)
{
- struct wildcard_entry *e;
-
- cds_list_for_each_entry(e, &wildcard_list, list) {
- /* If only contain '*' */
- if (strlen(e->name) == 1)
- goto possible_match;
- /* Compare excluding final '*' */
- if (!strncmp(desc->name, e->name, strlen(e->name) - 1))
- goto possible_match;
- continue; /* goto next, no match */
- possible_match:
- if (lttng_loglevel_match(desc,
- e->loglevel_type,
- e->loglevel)) {
- return e;
- }
- /* no match, loop to next */
+ synchronize_rcu();
+}
+
+struct lttng_session *lttng_session_create(void)
+{
+ struct lttng_session *session;
+ int i;
+
+ session = zmalloc(sizeof(struct lttng_session));
+ if (!session)
+ return NULL;
+ if (lttng_session_context_init(&session->ctx)) {
+ free(session);
+ return NULL;
}
- 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;
}
/*
- * called at event creation if probe is missing.
- * called with session mutex held.
+ * Only used internally at session destruction.
*/
static
-int add_pending_probe(struct lttng_event *event, const char *name,
- enum lttng_ust_loglevel_type loglevel_type,
- int loglevel)
+void _lttng_channel_unmap(struct lttng_channel *lttng_chan)
{
- struct cds_hlist_head *head;
- struct ust_pending_probe *e;
- size_t name_len = strlen(name) + 1;
- uint32_t hash;
+ struct channel *chan;
+ struct lttng_ust_shm_handle *handle;
- if (name_len > LTTNG_UST_SYM_NAME_LEN) {
- WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN);
- name_len = LTTNG_UST_SYM_NAME_LEN;
- }
- hash = jhash(name, name_len - 1, 0);
- head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)];
- e = zmalloc(sizeof(struct ust_pending_probe) + name_len);
- if (!e)
- return -ENOMEM;
- memcpy(&e->name[0], name, name_len);
- e->name[name_len - 1] = '\0';
- e->loglevel_type = loglevel_type;
- e->loglevel = loglevel;
- cds_hlist_add_head(&e->node, head);
- e->event = event;
- event->pending_probe = e;
- return 0;
+ cds_list_del(<tng_chan->node);
+ lttng_destroy_context(lttng_chan->ctx);
+ chan = lttng_chan->chan;
+ handle = lttng_chan->handle;
+ /*
+ * note: lttng_chan is private data contained within handle. It
+ * will be freed along with the handle.
+ */
+ channel_destroy(chan, handle, 0);
}
-/*
- * remove a pending probe. called when at event teardown and when an
- * event is fixed (probe is loaded).
- * called with session mutex held.
- */
static
-void remove_pending_probe(struct ust_pending_probe *e)
+void register_event(struct lttng_event *event)
{
- if (!e)
- return;
- cds_hlist_del(&e->node);
- free(e);
+ 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 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;
}
/*
- * Called at library load: connect the probe on the events pending on
- * probe load.
- * called with session mutex held.
+ * Only used internally at session destruction.
*/
-int pending_probe_fix_events(const struct lttng_event_desc *desc)
+static
+void _lttng_event_unregister(struct lttng_event *event)
+{
+ if (event->registered)
+ unregister_event(event);
+}
+
+void lttng_session_destroy(struct lttng_session *session)
+{
+ struct lttng_channel *chan, *tmpchan;
+ struct lttng_event *event, *tmpevent;
+ struct lttng_enum *_enum, *tmp_enum;
+ struct lttng_enabler *enabler, *tmpenabler;
+
+ CMM_ACCESS_ONCE(session->active) = 0;
+ cds_list_for_each_entry(event, &session->events_head, node) {
+ _lttng_event_unregister(event);
+ }
+ synchronize_trace(); /* Wait for in-flight events to complete */
+ __tracepoint_probe_prune_release_queue();
+ cds_list_for_each_entry_safe(enabler, tmpenabler,
+ &session->enablers_head, node)
+ lttng_enabler_destroy(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);
+}
+
+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;
- struct cds_hlist_node *node, *p;
- struct ust_pending_probe *e;
- const char *name = desc->name;
+ struct cds_hlist_node *node;
int ret = 0;
- struct lttng_ust_event event_param;
- size_t name_len = strlen(name) + 1;
+ size_t name_len = strlen(enum_name);
uint32_t hash;
+ int notify_socket;
- /* Wildcard */
- {
- struct wildcard_entry *wildcard;
-
- //FIXME: should iterate on all match for filter.
- //FIXME: should re-use pending event if present rather
- //than create duplicate.
- wildcard = match_wildcard(desc);
- if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) {
- struct session_wildcard *sw;
-
- cds_list_for_each_entry(sw, &wildcard->session_list,
- session_list) {
- struct lttng_event *ev;
- int ret;
-
- memcpy(&event_param, &sw->event_param,
- sizeof(event_param));
- strncpy(event_param.name,
- desc->name,
- sizeof(event_param.name));
- event_param.name[sizeof(event_param.name) - 1] = '\0';
- /* create event */
- ret = lttng_event_create(sw->chan,
- &event_param, &ev);
- if (ret) {
- DBG("Error creating event");
- continue;
- }
- cds_list_add(&ev->wildcard_list,
- &sw->events);
- lttng_filter_event_link_wildcard_bytecode(ev,
- sw);
- }
+ hash = jhash(enum_name, name_len, 0);
+ head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)];
+ cds_hlist_for_each_entry(_enum, node, head, hlist) {
+ assert(_enum->desc);
+ if (!strncmp(_enum->desc->name, desc->name,
+ LTTNG_UST_SYM_NAME_LEN - 1)) {
+ ret = -EEXIST;
+ goto exist;
}
}
- if (name_len > LTTNG_UST_SYM_NAME_LEN) {
- WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN);
- name_len = LTTNG_UST_SYM_NAME_LEN;
+ notify_socket = lttng_get_notify_socket(session->owner);
+ if (notify_socket < 0) {
+ ret = notify_socket;
+ goto socket_error;
}
- hash = jhash(name, name_len - 1, 0);
- head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)];
- cds_hlist_for_each_entry_safe(e, node, p, head, node) {
- struct lttng_event *event;
- struct lttng_channel *chan;
- if (!lttng_loglevel_match(desc,
- e->loglevel_type,
- e->loglevel)) {
- continue;
- }
- if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) {
- continue;
- }
- /* TODO: wildcard same as pending event: duplicate */
- /* TODO: Should apply filter though */
- event = e->event;
- chan = event->chan;
- assert(!event->desc);
- event->desc = desc;
- event->pending_probe = NULL;
- remove_pending_probe(e);
- ret |= __tracepoint_probe_register(name,
- event->desc->probe_callback,
- event, event->desc->signature);
- if (ret)
- continue;
- event->id = chan->free_event_id++;
- ret |= _lttng_event_metadata_statedump(chan->session, chan,
- event);
- lttng_filter_event_link_bytecode(event);
+ _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;
}
-void synchronize_trace(void)
+static
+int lttng_create_enum_check(const struct lttng_type *type,
+ struct lttng_session *session)
{
- synchronize_rcu();
+ switch (type->atype) {
+ case atype_enum:
+ {
+ const struct lttng_enum_desc *enum_desc;
+ int ret;
+
+ enum_desc = type->u.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_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.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;
+ }
+ default:
+ /* TODO: nested types when they become supported. */
+ break;
+ }
+ return 0;
}
-struct lttng_session *lttng_session_create(void)
+static
+int lttng_create_all_event_enums(size_t nr_fields,
+ const struct lttng_event_field *event_fields,
+ struct lttng_session *session)
{
- struct lttng_session *session;
+ size_t i;
int ret;
- session = zmalloc(sizeof(struct lttng_session));
- if (!session)
- return NULL;
- CDS_INIT_LIST_HEAD(&session->chan);
- CDS_INIT_LIST_HEAD(&session->events);
- CDS_INIT_LIST_HEAD(&session->wildcards);
- ret = lttng_ust_uuid_generate(session->uuid);
- if (ret != 0) {
- session->uuid[0] = '\0';
+ /* 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;
}
- cds_list_add(&session->list, &sessions);
- return session;
+ return 0;
}
-void lttng_session_destroy(struct lttng_session *session)
+static
+int lttng_create_all_ctx_enums(size_t nr_fields,
+ const struct lttng_ctx_field *ctx_fields,
+ struct lttng_session *session)
{
- struct lttng_channel *chan, *tmpchan;
- struct lttng_event *event, *tmpevent;
- struct session_wildcard *wildcard, *tmpwildcard;
+ size_t i;
int ret;
- CMM_ACCESS_ONCE(session->active) = 0;
- cds_list_for_each_entry(event, &session->events, list) {
- ret = _lttng_event_unregister(event);
- WARN_ON(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;
}
- synchronize_trace(); /* Wait for in-flight events to complete */
- cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list)
- _lttng_wildcard_destroy(wildcard);
- cds_list_for_each_entry_safe(event, tmpevent, &session->events, list)
- _lttng_event_destroy(event);
- cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list)
- _lttng_channel_destroy(chan);
- cds_list_del(&session->list);
- free(session);
+ 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;
struct lttng_channel *chan;
+ int notify_socket;
if (session->active) {
ret = -EBUSY;
goto end;
}
+ notify_socket = lttng_get_notify_socket(session->owner);
+ if (notify_socket < 0)
+ return notify_socket;
+
+ /* Set transient enabler state to "enabled" */
+ session->tstate = 1;
+
/*
* Snapshot the number of events per channel to know the type of header
* we need to use.
*/
- cds_list_for_each_entry(chan, &session->chan, list) {
+ cds_list_for_each_entry(chan, &session->chan_head, node) {
+ const struct lttng_ctx *ctx;
+ 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)
- continue; /* don't change it if session stop/restart */
- if (chan->free_event_id < 31)
- chan->header_type = 1; /* compact */
- else
- chan->header_type = 2; /* large */
+ continue;
+ ctx = chan->ctx;
+ if (ctx) {
+ nr_fields = ctx->nr_fields;
+ 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->header_type);
+ 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;
+ }
}
+ /* We need to sync enablers with session before activation. */
+ lttng_session_sync_enablers(session);
+
+ /* Set atomically the state to "active" */
CMM_ACCESS_ONCE(session->active) = 1;
CMM_ACCESS_ONCE(session->been_active) = 1;
- ret = _lttng_session_metadata_statedump(session);
+
+ ret = lttng_session_statedump(session);
if (ret)
- CMM_ACCESS_ONCE(session->active) = 0;
+ 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_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_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;
-
- if (channel == channel->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&channel->enabled, 0);
- if (!old)
- return -EEXIST;
- return 0;
-}
-
-int lttng_event_enable(struct lttng_event *event)
-{
- int old;
-
- if (event->chan == event->chan->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&event->enabled, 1);
- if (old)
- return -EEXIST;
- return 0;
-}
-
-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;
-}
-
-struct lttng_channel *lttng_channel_create(struct lttng_session *session,
- const char *transport_name,
- void *buf_addr,
- size_t subbuf_size, size_t num_subbuf,
- unsigned int switch_timer_interval,
- unsigned int read_timer_interval,
- int **shm_fd, int **wait_fd,
- uint64_t **memory_map_size,
- struct lttng_channel *chan_priv_init)
-{
- struct lttng_channel *chan = NULL;
- struct lttng_transport *transport;
+ int ret = 0;
- if (session->been_active)
- goto active; /* Refuse to add channel to active session */
- transport = lttng_transport_find(transport_name);
- if (!transport) {
- DBG("LTTng transport %s not found\n",
- transport_name);
- goto notransport;
+ if (!channel->enabled) {
+ ret = -EBUSY;
+ goto end;
}
- chan_priv_init->id = session->free_chan_id++;
- chan_priv_init->session = session;
- /*
- * Note: the channel creation op already writes into the packet
- * headers. Therefore the "chan" information used as input
- * should be already accessible.
- */
- chan = transport->ops.channel_create(transport_name, buf_addr,
- subbuf_size, num_subbuf, switch_timer_interval,
- read_timer_interval, shm_fd, wait_fd,
- memory_map_size, chan_priv_init);
- if (!chan)
- goto create_error;
- chan->enabled = 1;
- chan->ops = &transport->ops;
- cds_list_add(&chan->list, &session->chan);
- return chan;
-
-create_error:
-notransport:
-active:
- return NULL;
-}
-
-/*
- * Only used internally at session destruction.
- */
-static
-void _lttng_channel_destroy(struct lttng_channel *chan)
-{
- cds_list_del(&chan->list);
- lttng_destroy_context(chan->ctx);
- chan->ops->channel_destroy(chan);
+ /* Set atomically the state to "disabled" */
+ CMM_ACCESS_ONCE(channel->enabled) = 0;
+ /* Set transient enabler state to "enabled" */
+ channel->tstate = 0;
+ lttng_session_sync_enablers(channel->session);
+end:
+ return ret;
}
/*
* Supports event creation while tracing session is active.
*/
-int lttng_event_create(struct lttng_channel *chan,
- struct lttng_ust_event *event_param,
- struct lttng_event **_event)
+static
+int lttng_event_create(const struct lttng_event_desc *desc,
+ struct lttng_channel *chan)
{
- const struct lttng_event_desc *desc = NULL; /* silence gcc */
+ const char *event_name = desc->name;
struct lttng_event *event;
+ struct lttng_session *session = chan->session;
+ struct cds_hlist_head *head;
int ret = 0;
+ size_t name_len = strlen(event_name);
+ uint32_t hash;
+ int notify_socket, loglevel;
+ const char *uri;
- if (chan->used_event_id == -1U) {
- ret = -ENOMEM;
- goto full;
+ hash = jhash(event_name, name_len, 0);
+ head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
+
+ notify_socket = lttng_get_notify_socket(session->owner);
+ if (notify_socket < 0) {
+ ret = notify_socket;
+ goto socket_error;
}
- //FIXME: re-use event if already registered by wildcard or
- //if we have a pending probe.... (CHECK)
- /*
- * This is O(n^2) (for each event, the loop is called at event
- * creation). Might require a hash if we have lots of events.
- */
- cds_list_for_each_entry(event, &chan->session->events, list) {
- if (event->desc && !strncmp(event->desc->name,
- event_param->name,
- LTTNG_UST_SYM_NAME_LEN - 1)) {
- ret = -EEXIST;
- goto exist;
- }
+
+ 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.
*/
- if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) {
- desc = lttng_event_get(event_param->name);
- if (desc) {
- if (!lttng_loglevel_match(desc,
- event_param->loglevel_type,
- event_param->loglevel)) {
- ret = -EPERM;
- goto no_loglevel_match;
- }
- }
- /*
- * If descriptor is not there, it will be added to
- * pending probes.
- */
- }
event = zmalloc(sizeof(struct lttng_event));
if (!event) {
ret = -ENOMEM;
goto cache_error;
}
event->chan = chan;
- /*
- * used_event_id counts the maximum number of event IDs that can
- * register if all probes register.
- */
- chan->used_event_id++;
- event->enabled = 1;
- CDS_INIT_LIST_HEAD(&event->filter_bytecode);
- CDS_INIT_LIST_HEAD(&event->bytecode_runtime);
- event->instrumentation = event_param->instrumentation;
+
+ /* Event will be enabled by enabler sync. */
+ event->enabled = 0;
+ event->registered = 0;
+ CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head);
+ CDS_INIT_LIST_HEAD(&event->enablers_ref_head);
+ event->desc = desc;
+
+ if (desc->loglevel)
+ loglevel = *(*event->desc->loglevel);
+ else
+ loglevel = TRACE_DEFAULT;
+ if (desc->u.ext.model_emf_uri)
+ uri = *(desc->u.ext.model_emf_uri);
+ else
+ uri = NULL;
+
+ /* Fetch event ID from sessiond */
+ ret = ustcomm_register_event(notify_socket,
+ session,
+ session->objd,
+ chan->objd,
+ event_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();
- switch (event_param->instrumentation) {
- case LTTNG_UST_TRACEPOINT:
- event->desc = desc;
- if (event->desc) {
- ret = __tracepoint_probe_register(event_param->name,
- event->desc->probe_callback,
- event, event->desc->signature);
- if (ret)
- goto register_error;
- event->id = chan->free_event_id++;
- } else {
- /*
- * If the probe is not present, event->desc stays NULL,
- * waiting for the probe to register, and the event->id
- * stays unallocated.
- */
- ret = add_pending_probe(event, event_param->name,
- event_param->loglevel_type,
- event_param->loglevel);
- if (ret)
- goto add_pending_error;
- }
- break;
- default:
- WARN_ON_ONCE(1);
- }
- if (event->desc) {
- ret = _lttng_event_metadata_statedump(chan->session, chan, event);
- if (ret)
- goto statedump_error;
- }
- cds_list_add(&event->list, &chan->session->events);
- *_event = event;
+ cds_list_add(&event->node, &chan->session->events_head);
+ cds_hlist_add_head(&event->hlist, head);
return 0;
-statedump_error:
- if (event->desc) {
- WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name,
- event->desc->probe_callback,
- event));
- lttng_event_put(event->desc);
- }
-add_pending_error:
-register_error:
+sessiond_register_error:
free(event);
cache_error:
-no_loglevel_match:
-exist:
-full:
+create_enum_error:
+socket_error:
return ret;
}
-/*
- * Only used internally at session destruction.
- */
-int _lttng_event_unregister(struct lttng_event *event)
+static
+int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc,
+ struct lttng_enabler *enabler)
{
- int ret = -EINVAL;
-
- switch (event->instrumentation) {
- case LTTNG_UST_TRACEPOINT:
- if (event->desc) {
- ret = __tracepoint_probe_unregister(event->desc->name,
- event->desc->probe_callback,
- event);
- if (ret)
- return ret;
- } else {
- remove_pending_probe(event->pending_probe);
- ret = 0;
- }
- break;
- default:
- WARN_ON_ONCE(1);
- }
- return ret;
-}
+ int loglevel = 0;
+ unsigned int has_loglevel = 0;
-/*
- * Only used internally at session destruction.
- */
-static
-void _lttng_event_destroy(struct lttng_event *event)
-{
- switch (event->instrumentation) {
- case LTTNG_UST_TRACEPOINT:
- if (event->desc) {
- lttng_event_put(event->desc);
- }
- break;
- default:
- WARN_ON_ONCE(1);
+ assert(enabler->type == LTTNG_ENABLER_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);
+ has_loglevel = 1;
}
- cds_list_del(&event->list);
- lttng_destroy_context(event->ctx);
- lttng_free_event_filter_runtime(event);
- lttng_free_event_filter_bytecode(event);
- free(event);
+ if (!lttng_loglevel_match(loglevel,
+ has_loglevel,
+ enabler->event_param.loglevel_type,
+ enabler->event_param.loglevel))
+ return 0;
+ return 1;
}
-/*
- * 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, ...)
+static
+int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc,
+ struct lttng_enabler *enabler)
{
- 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);
+ int loglevel = 0;
+ unsigned int has_loglevel = 0;
+
+ assert(enabler->type == LTTNG_ENABLER_EVENT);
+ if (strcmp(desc->name, enabler->event_param.name))
+ return 0;
+ if (desc->loglevel) {
+ loglevel = *(*desc->loglevel);
+ has_loglevel = 1;
}
-end:
- free(str);
- return ret;
+ if (!lttng_loglevel_match(loglevel,
+ has_loglevel,
+ enabler->event_param.loglevel_type,
+ enabler->event_param.loglevel))
+ return 0;
+ return 1;
}
static
-int _lttng_field_statedump(struct lttng_session *session,
- const struct lttng_event_field *field)
+int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
+ struct lttng_enabler *enabler)
{
- 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:
+ switch (enabler->type) {
+ case LTTNG_ENABLER_STAR_GLOB:
{
- 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;
+ struct lttng_ust_excluder_node *excluder;
- 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;
- }
+ if (!lttng_desc_match_star_glob_enabler(desc, enabler)) {
+ return 0;
+ }
- 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;
+ /*
+ * 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_EVENT:
+ return lttng_desc_match_event_enabler(desc, enabler);
default:
- WARN_ON_ONCE(1);
return -EINVAL;
}
- return ret;
}
static
-int _lttng_context_metadata_statedump(struct lttng_session *session,
- struct lttng_ctx *ctx)
+int lttng_event_match_enabler(struct lttng_event *event,
+ struct lttng_enabler *enabler)
{
- int ret = 0;
- int i;
-
- if (!ctx)
+ if (lttng_desc_match_enabler(event->desc, enabler)
+ && event->chan == enabler->chan)
+ return 1;
+ else
return 0;
- for (i = 0; i < ctx->nr_fields; i++) {
- const struct lttng_ctx_field *field = &ctx->fields[i];
-
- ret = _lttng_field_statedump(session, &field->event_field);
- if (ret)
- return ret;
- }
- return ret;
}
static
-int _lttng_fields_metadata_statedump(struct lttng_session *session,
- struct lttng_event *event)
+struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event,
+ struct lttng_enabler *enabler)
{
- const struct lttng_event_desc *desc = event->desc;
- int ret = 0;
- int i;
-
- for (i = 0; i < desc->nr_fields; i++) {
- const struct lttng_event_field *field = &desc->fields[i];
+ struct lttng_enabler_ref *enabler_ref;
- ret = _lttng_field_statedump(session, field);
- if (ret)
- return ret;
+ cds_list_for_each_entry(enabler_ref,
+ &event->enablers_ref_head, node) {
+ if (enabler_ref->ref == enabler)
+ return enabler_ref;
}
- return ret;
+ return NULL;
}
+/*
+ * Create struct lttng_event if it is missing and present in the list of
+ * tracepoint probes.
+ */
static
-int _lttng_event_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan,
- struct lttng_event *event)
+void lttng_create_event_if_missing(struct lttng_enabler *enabler)
{
- int ret = 0;
- int loglevel = TRACE_DEFAULT;
+ struct lttng_session *session = enabler->chan->session;
+ struct lttng_probe_desc *probe_desc;
+ const struct lttng_event_desc *desc;
+ struct lttng_event *event;
+ int i;
+ struct cds_list_head *probe_list;
- if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
- return 0;
- if (chan == session->metadata)
- return 0;
+ probe_list = lttng_get_probe_list_head();
/*
- * Don't print events for which probe load is pending.
+ * For each probe event, if we find that a probe event matches
+ * our enabler, create an associated lttng_event if not
+ * already present.
*/
- if (!event->desc)
- return 0;
+ cds_list_for_each_entry(probe_desc, probe_list, head) {
+ for (i = 0; i < probe_desc->nr_events; i++) {
+ int found = 0, ret;
+ 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))
+ continue;
+ event_name = desc->name;
+ name_len = strlen(event_name);
- 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;
- }
+ /*
+ * Check if already created.
+ */
+ hash = jhash(event_name, name_len, 0);
+ head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
+ cds_hlist_for_each_entry(event, node, head, hlist) {
+ if (event->desc == desc
+ && event->chan == enabler->chan)
+ found = 1;
+ }
+ if (found)
+ continue;
- 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;
+ /*
+ * We need to create an event for this
+ * event probe.
+ */
+ ret = lttng_event_create(probe_desc->event_desc[i],
+ enabler->chan);
+ if (ret) {
+ DBG("Unable to create event %s, error %d\n",
+ probe_desc->event_desc[i]->name, ret);
+ }
+ }
}
+}
- ret = lttng_metadata_printf(session,
- " fields := struct {\n"
- );
- if (ret)
- goto end;
+/*
+ * 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)
+{
+ struct cds_hlist_node *node, *tmp_node;
+ struct cds_list_head *sessionsp;
+ struct lttng_session *session;
+ struct cds_hlist_head *head;
+ struct lttng_event *event;
+ int i;
- ret = _lttng_fields_metadata_statedump(session, event);
- if (ret)
- goto end;
+ /* Get handle on list of sessions. */
+ sessionsp = _lttng_get_sessions();
/*
- * LTTng space reservation can only reserve multiples of the
- * byte size.
+ * Iterate over all events in the probe provider descriptions and sessions
+ * to queue the unregistration of the events.
*/
- ret = lttng_metadata_printf(session,
- " };\n"
- "};\n\n");
- if (ret)
- goto end;
+ for (i = 0; i < provider_desc->nr_events; i++) {
+ const struct lttng_event_desc *event_desc;
+ const char *event_name;
+ size_t name_len;
+ uint32_t hash;
+
+ event_desc = provider_desc->event_desc[i];
+ event_name = event_desc->name;
+ name_len = strlen(event_name);
+ hash = jhash(event_name, name_len, 0);
+
+ /* 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 = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
+ cds_hlist_for_each_entry(event, node, head, hlist) {
+ if (event_desc == event->desc) {
+ /* Queue the unregistration of this event. */
+ _lttng_event_unregister(event);
+ break;
+ }
+ }
+ }
+ }
- event->metadata_dumped = 1;
-end:
- return ret;
+ /* Wait for grace period. */
+ 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.
+ */
+ for (i = 0; i < provider_desc->nr_events; i++) {
+ const struct lttng_event_desc *event_desc;
+ const char *event_name;
+ size_t name_len;
+ uint32_t hash;
+
+ event_desc = provider_desc->event_desc[i];
+ event_name = event_desc->name;
+ name_len = strlen(event_name);
+ hash = jhash(event_name, name_len, 0);
+
+ /* Iterate over all sessions 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 = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)];
+ cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) {
+ if (event_desc == event->desc) {
+ /* Destroy enums of the current event. */
+ for (j = 0; j < event->desc->nr_fields; j++) {
+ const struct lttng_enum_desc *enum_desc;
+ const struct lttng_event_field *field;
+ struct lttng_enum *curr_enum;
+
+ field = &(event->desc->fields[j]);
+ if (field->type.atype != atype_enum) {
+ continue;
+ }
+
+ enum_desc = field->type.u.basic.enumeration.desc;
+ 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);
+ break;
+ }
+ }
+ }
+ }
}
+/*
+ * Create events associated with an enabler (if not already present),
+ * and add backward reference from the event to the enabler.
+ */
static
-int _lttng_channel_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan)
+int lttng_enabler_ref_events(struct lttng_enabler *enabler)
{
- int ret = 0;
+ struct lttng_session *session = enabler->chan->session;
+ struct lttng_event *event;
- if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active))
- return 0;
- if (chan == session->metadata)
- return 0;
+ /* First ensure that probe events are created for this enabler. */
+ lttng_create_event_if_missing(enabler);
- 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;
+ /* 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 (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;
- }
+ if (!lttng_event_match_enabler(event, enabler))
+ continue;
- ret = lttng_metadata_printf(session,
- "};\n\n");
+ enabler_ref = lttng_event_enabler_ref(event, enabler);
+ if (!enabler_ref) {
+ /*
+ * If no backward ref, create it.
+ * Add backward ref from event to enabler.
+ */
+ enabler_ref = zmalloc(sizeof(*enabler_ref));
+ if (!enabler_ref)
+ return -ENOMEM;
+ enabler_ref->ref = enabler;
+ cds_list_add(&enabler_ref->node,
+ &event->enablers_ref_head);
+ }
- chan->metadata_dumped = 1;
-end:
- return ret;
-}
+ /*
+ * Link filter bytecodes if not linked yet.
+ */
+ lttng_enabler_event_link_bytecode(event, enabler);
-static
-int _lttng_stream_packet_context_declare(struct lttng_session *session)
-{
- 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"
- );
+ /* TODO: merge event context. */
+ }
+ 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.
+ * Called at library load: connect the probe on all enablers matching
+ * this event.
+ * Called with session mutex held.
*/
-static
-int _lttng_event_header_declare(struct lttng_session *session)
+int lttng_fix_pending_events(void)
{
- 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
- );
+ struct lttng_session *session;
+
+ cds_list_for_each_entry(session, &sessions, node) {
+ lttng_session_lazy_sync_enablers(session);
+ }
+ return 0;
}
/*
- * 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.
+ * 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.
*/
-static
-uint64_t measure_clock_offset(void)
+void lttng_handle_pending_statedump(void *owner)
{
- uint64_t offset, monotonic[2], realtime;
- struct timespec rts = { 0, 0 };
- int ret;
+ struct lttng_session *session;
- 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;
+ /* 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;
}
/*
- * Output metadata into this session's metadata buffers.
+ * Only used internally at session destruction.
*/
static
-int _lttng_session_metadata_statedump(struct lttng_session *session)
+void _lttng_event_destroy(struct lttng_event *event)
{
- unsigned char *uuid_c = session->uuid;
- 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];
+ struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref;
- 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;
- }
+ /* Remove from event list. */
+ cds_list_del(&event->node);
+ /* Remove from event hash table. */
+ cds_hlist_del(&event->hlist);
- 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;
+ lttng_destroy_context(event->ctx);
+ lttng_free_event_filter_runtime(event);
+ /* Free event enabler refs */
+ cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref,
+ &event->enablers_ref_head, node)
+ free(enabler_ref);
+ free(event);
+}
- /* 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;
+static
+void _lttng_enum_destroy(struct lttng_enum *_enum)
+{
+ cds_list_del(&_enum->node);
+ cds_hlist_del(&_enum->hlist);
+ free(_enum);
+}
- ret = lttng_metadata_printf(session,
- "clock {\n"
- " name = %s;\n",
- "monotonic"
- );
- if (ret)
- goto end;
+void lttng_ust_events_exit(void)
+{
+ struct lttng_session *session, *tmpsession;
- if (!trace_clock_uuid(clock_uuid_s)) {
- ret = lttng_metadata_printf(session,
- " uuid = \"%s\";\n",
- clock_uuid_s
- );
- if (ret)
- goto end;
- }
+ cds_list_for_each_entry_safe(session, tmpsession, &sessions, node)
+ lttng_session_destroy(session);
+}
- 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;
+/*
+ * Enabler management.
+ */
+struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
+ struct lttng_ust_event *event_param,
+ struct lttng_channel *chan)
+{
+ struct lttng_enabler *enabler;
- 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;
+ enabler = zmalloc(sizeof(*enabler));
+ if (!enabler)
+ return NULL;
+ enabler->type = type;
+ CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head);
+ CDS_INIT_LIST_HEAD(&enabler->excluder_head);
+ memcpy(&enabler->event_param, event_param,
+ sizeof(enabler->event_param));
+ enabler->chan = chan;
+ /* ctx left NULL */
+ enabler->enabled = 0;
+ cds_list_add(&enabler->node, &enabler->chan->session->enablers_head);
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ return enabler;
+}
- ret = _lttng_stream_packet_context_declare(session);
- if (ret)
- goto end;
+int lttng_enabler_enable(struct lttng_enabler *enabler)
+{
+ enabler->enabled = 1;
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ return 0;
+}
- ret = _lttng_event_header_declare(session);
- if (ret)
- goto end;
+int lttng_enabler_disable(struct lttng_enabler *enabler)
+{
+ enabler->enabled = 0;
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ return 0;
+}
-skip_session:
- cds_list_for_each_entry(chan, &session->chan, list) {
- ret = _lttng_channel_metadata_statedump(session, chan);
- if (ret)
- goto end;
- }
+int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
+ struct lttng_ust_filter_bytecode_node *bytecode)
+{
+ bytecode->enabler = enabler;
+ cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head);
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ return 0;
+}
- cds_list_for_each_entry(event, &session->events, list) {
- ret = _lttng_event_metadata_statedump(session, event->chan, event);
- if (ret)
- goto end;
- }
- session->metadata_dumped = 1;
-end:
- return ret;
+int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler,
+ struct lttng_ust_excluder_node *excluder)
+{
+ excluder->enabler = enabler;
+ cds_list_add_tail(&excluder->node, &enabler->excluder_head);
+ lttng_session_lazy_sync_enablers(enabler->chan->session);
+ return 0;
}
-void lttng_ust_events_exit(void)
+int lttng_attach_context(struct lttng_ust_context *context_param,
+ union ust_args *uargs,
+ struct lttng_ctx **ctx, struct lttng_session *session)
{
- struct lttng_session *session, *tmpsession;
+ /*
+ * We cannot attach a context after trace has been started for a
+ * session because the metadata does not allow expressing this
+ * information outside of the original channel scope.
+ */
+ if (session->been_active)
+ return -EPERM;
- cds_list_for_each_entry_safe(session, tmpsession, &sessions, list)
- lttng_session_destroy(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);
+ default:
+ return -EINVAL;
+ }
}
-/* WILDCARDS */
-
-static
-int wildcard_same_loglevel(struct wildcard_entry *e,
- enum lttng_ust_loglevel_type loglevel_type,
- int loglevel)
+int lttng_enabler_attach_context(struct lttng_enabler *enabler,
+ struct lttng_ust_context *context_param)
{
- if (e->loglevel_type == loglevel_type && e->loglevel == loglevel)
- return 1;
- else
- return 0;
+#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;
}
-#if 0
static
-int wildcard_is_within(struct wildcard_entry *e,
- enum lttng_ust_loglevel_type loglevel_type,
- int loglevel)
+void lttng_enabler_destroy(struct lttng_enabler *enabler)
{
- if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL
- || e->loglevel == -1)
- return 1;
- switch (e->loglevel_type) {
- case LTTNG_UST_LOGLEVEL_RANGE:
- switch (loglevel_type) {
- case LTTNG_UST_LOGLEVEL_RANGE:
- if (e->loglevel >= loglevel)
- return 1;
- else
- return 0;
- case LTTNG_UST_LOGLEVEL_SINGLE:
- if (e->loglevel <= 0 && loglevel == 0)
- return 1;
- else
- return 0;
- }
- case LTTNG_UST_LOGLEVEL_SINGLE:
- switch (loglevel_type) {
- case LTTNG_UST_LOGLEVEL_RANGE:
- if (loglevel <= 0)
- return 1;
- else
- return 0;
- case LTTNG_UST_LOGLEVEL_SINGLE:
- if (e->loglevel == loglevel)
- return 1;
- else
- return 0;
- }
+ struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node;
+ struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node;
+
+ /* 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);
+ }
+
+ /* Destroy contexts */
+ lttng_destroy_context(enabler->ctx);
+
+ cds_list_del(&enabler->node);
+ free(enabler);
}
-#endif
/*
- * Add the wildcard to the wildcard list. Must be called with
- * ust lock held.
+ * lttng_session_sync_enablers should be called just before starting a
+ * session.
*/
static
-struct session_wildcard *add_wildcard(struct lttng_channel *chan,
- struct lttng_ust_event *event_param)
+void lttng_session_sync_enablers(struct lttng_session *session)
{
- struct wildcard_entry *e;
- struct session_wildcard *sw;
- size_t name_len = strlen(event_param->name) + 1;
- int found = 0;
-
- //FIXME: ensure that wildcard re-use pending events, or
- //re-use actual events, applying its filter on top.
+ struct lttng_enabler *enabler;
+ struct lttng_event *event;
+ cds_list_for_each_entry(enabler, &session->enablers_head, node)
+ lttng_enabler_ref_events(enabler);
/*
- * Try to find global wildcard entry. Given that this is shared
- * across all sessions, we need to check for exact loglevel
- * match, not just whether contained within the existing ones.
+ * For each event, if at least one of its enablers is enabled,
+ * and its channel and session transient states are enabled, we
+ * enable the event, else we disable it.
*/
- cds_list_for_each_entry(e, &wildcard_list, list) {
- if (!strncmp(event_param->name, e->name,
- LTTNG_UST_SYM_NAME_LEN - 1)) {
- if (wildcard_same_loglevel(e,
- event_param->loglevel_type,
- event_param->loglevel)) {
- found = 1;
+ cds_list_for_each_entry(event, &session->events_head, node) {
+ struct lttng_enabler_ref *enabler_ref;
+ struct lttng_bytecode_runtime *runtime;
+ int enabled = 0, has_enablers_without_bytecode = 0;
+
+ /* Enable events */
+ cds_list_for_each_entry(enabler_ref,
+ &event->enablers_ref_head, node) {
+ if (enabler_ref->ref->enabled) {
+ enabled = 1;
break;
}
}
- }
+ /*
+ * Enabled state is based on union of enablers, with
+ * intesection of session and channel transient enable
+ * states.
+ */
+ enabled = enabled && session->tstate && event->chan->tstate;
- if (!found) {
+ CMM_STORE_SHARED(event->enabled, enabled);
/*
- * Create global wildcard entry if not found. Using
- * zmalloc here to allocate a variable length element.
- * Could cause some memory fragmentation if overused.
+ * Sync tracepoint registration with event enabled
+ * state.
*/
- e = zmalloc(sizeof(struct wildcard_entry) + name_len);
- if (!e)
- return ERR_PTR(-ENOMEM);
- memcpy(&e->name[0], event_param->name, name_len);
- e->loglevel_type = event_param->loglevel_type;
- e->loglevel = event_param->loglevel;
- CDS_INIT_LIST_HEAD(&e->filter_bytecode);
- cds_list_add(&e->list, &wildcard_list);
- CDS_INIT_LIST_HEAD(&e->session_list);
- }
+ 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,
+ &event->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->has_enablers_without_bytecode =
+ has_enablers_without_bytecode;
- /* session wildcard */
- cds_list_for_each_entry(sw, &e->session_list, session_list) {
- if (chan == sw->chan) {
- DBG("wildcard %s busy for this channel",
- event_param->name);
- return ERR_PTR(-EEXIST); /* Already there */
+ /* Enable filters */
+ cds_list_for_each_entry(runtime,
+ &event->bytecode_runtime_head, node) {
+ lttng_filter_sync_state(runtime);
}
}
- sw = zmalloc(sizeof(struct session_wildcard));
- if (!sw)
- return ERR_PTR(-ENOMEM);
- sw->chan = chan;
- sw->enabled = 1;
- memcpy(&sw->event_param, event_param, sizeof(sw->event_param));
- sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT;
- sw->event_param.loglevel_type = event_param->loglevel_type;
- sw->event_param.loglevel = event_param->loglevel;
- CDS_INIT_LIST_HEAD(&sw->filter_bytecode);
- CDS_INIT_LIST_HEAD(&sw->events);
- cds_list_add(&sw->list, &chan->session->wildcards);
- cds_list_add(&sw->session_list, &e->session_list);
- sw->entry = e;
- lttng_probes_create_wildcard_events(e, sw);
- return sw;
+ __tracepoint_probe_prune_release_queue();
}
/*
- * Remove the wildcard from the wildcard list. Must be called with
- * ust_lock held. Only called at session teardown.
+ * Apply enablers to session events, adding events to session if need
+ * be. It is required after each modification applied to an active
+ * session, and right before session "start".
+ * "lazy" sync means we only sync if required.
*/
static
-void _remove_wildcard(struct session_wildcard *wildcard)
+void lttng_session_lazy_sync_enablers(struct lttng_session *session)
{
- struct lttng_event *ev, *tmp;
-
- /*
- * Just remove the events owned (for enable/disable) by this
- * wildcard from the list. The session teardown will take care
- * of freeing the event memory.
- */
- cds_list_for_each_entry_safe(ev, tmp, &wildcard->events,
- wildcard_list) {
- cds_list_del(&ev->wildcard_list);
- }
- cds_list_del(&wildcard->session_list);
- cds_list_del(&wildcard->list);
- if (cds_list_empty(&wildcard->entry->session_list)) {
- cds_list_del(&wildcard->entry->list);
- free(wildcard->entry);
- }
- lttng_free_wildcard_filter_bytecode(wildcard);
- free(wildcard);
-}
-
-int lttng_wildcard_create(struct lttng_channel *chan,
- struct lttng_ust_event *event_param,
- struct session_wildcard **_sw)
-{
- struct session_wildcard *sw;
-
- sw = add_wildcard(chan, event_param);
- if (!sw || IS_ERR(sw)) {
- return PTR_ERR(sw);
- }
- *_sw = sw;
- return 0;
+ /* We can skip if session is not active */
+ if (!session->active)
+ return;
+ lttng_session_sync_enablers(session);
}
-static
-void _lttng_wildcard_destroy(struct session_wildcard *sw)
+/*
+ * 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))
{
- _remove_wildcard(sw);
-}
+ struct lttng_session *session;
-int lttng_wildcard_enable(struct session_wildcard *wildcard)
-{
- struct lttng_event *ev;
- int ret;
+ cds_list_for_each_entry(session, &sessions, node) {
+ struct lttng_channel *chan;
+ struct lttng_event *event;
+ int ret;
- if (wildcard->enabled)
- return -EEXIST;
- cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
- ret = lttng_event_enable(ev);
- if (ret) {
- DBG("Error: enable error.\n");
- return 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();
}
- }
- wildcard->enabled = 1;
- return 0;
-}
-
-int lttng_wildcard_disable(struct session_wildcard *wildcard)
-{
- struct lttng_event *ev;
- int ret;
-
- if (!wildcard->enabled)
- return -EEXIST;
- cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) {
- ret = lttng_event_disable(ev);
- if (ret) {
- DBG("Error: disable error.\n");
- return ret;
+ 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();
}
}
- wildcard->enabled = 0;
- return 0;
-}
-
-/*
- * Take the TLS "fault" in libuuid if dlopen'd, which can take the
- * dynamic linker mutex, outside of the UST lock, since the UST lock is
- * taken in constructors, which are called with dynamic linker mutex
- * held.
- */
-void lttng_fixup_event_tls(void)
-{
- unsigned char uuid[LTTNG_UST_UUID_STR_LEN];
-
- (void) lttng_ust_uuid_generate(uuid);
}
projects / lttng-ust.git / blobdiff