#include <usterr-signal-safe.h>
#include <helper.h>
-#include <ust-ctl.h>
+#include <lttng/ust-ctl.h>
#include <ust-comm.h>
#include "error.h"
#include "compat.h"
#include "tracepoint-internal.h"
#include "lttng-tracer.h"
#include "lttng-tracer-core.h"
+#include "lttng-ust-baddr.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 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_session_lazy_sync_enablers(struct lttng_session *session);
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;
}
}
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(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(desc->name,
+ desc->probe_callback,
+ event);
+ WARN_ON_ONCE(ret);
+ if (!ret)
+ event->registered = 0;
+}
+
+/*
+ * Only used internally at session destruction.
+ */
+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_enabler *enabler, *tmpenabler;
- int ret;
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,
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);
*/
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 = ustcomm_register_channel(notify_socket,
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_metadata_statedump(session);
- if (ret)
- CMM_ACCESS_ONCE(session->active) = 0;
+
+ session->statedump_pending = 1;
+ lttng_ust_sockinfo_session_enabled(session->owner);
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;
+ int ret = 0;
- if (event->chan == event->chan->session->metadata)
- return -EPERM;
- old = uatomic_xchg(&event->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_enablers(channel->session);
+end:
+ return ret;
}
/*
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)) {
+ if (!strncmp(event->desc->name, desc->name,
+ LTTNG_UST_SYM_NAME_LEN - 1)
+ && chan == event->chan) {
ret = -EEXIST;
goto exist;
}
}
event->chan = chan;
- event->enabled = 1;
+ /* 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;
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;
-
- ret = _lttng_event_metadata_statedump(chan->session, chan, event);
- if (ret)
- goto statedump_error;
cds_list_add(&event->node, &chan->session->events_head);
cds_hlist_add_head(&event->hlist, head);
return 0;
-statedump_error:
- WARN_ON_ONCE(__tracepoint_probe_unregister(event_name,
- desc->probe_callback,
- event));
-tracepoint_register_error:
sessiond_register_error:
free(event);
cache_error:
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 '*' */
int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
struct lttng_enabler *enabler)
{
+ struct lttng_ust_excluder_node *excluder;
+
+ /* If 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 found, 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 && excluder_name[len - 1] == '*') {
+ found = !strncmp(desc->name, excluder_name,
+ len - 1);
+ } else {
+ found = !strncmp(desc->name, excluder_name,
+ LTTNG_UST_SYM_NAME_LEN - 1);
+ }
+ if (found) {
+ return 0;
+ }
+ }
+ }
switch (enabler->type) {
case LTTNG_ENABLER_WILDCARD:
return lttng_desc_match_wildcard_enabler(desc, enabler);
int lttng_event_match_enabler(struct lttng_event *event,
struct lttng_enabler *enabler)
{
- return lttng_desc_match_enabler(event->desc, enabler);
+ if (lttng_desc_match_enabler(event->desc, enabler)
+ && event->chan == enabler->chan)
+ return 1;
+ else
+ return 0;
}
static
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)
+ if (event->desc == desc
+ && event->chan == enabler->chan)
found = 1;
}
if (found)
/*
* 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;
}
/*
- * 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 */
+ lttng_ust_baddr_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;
}
/*
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)
-{
- 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;
-}
-
-static
-int _lttng_context_metadata_statedump(struct lttng_session *session,
- struct lttng_ctx *ctx)
-{
- 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];
-
- 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)
-{
- 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];
-
- ret = _lttng_field_statedump(session, field);
- if (ret)
- return ret;
- }
- return ret;
-}
-
-static
-int _lttng_event_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan,
- struct lttng_event *event)
-{
- 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;
-
-}
-
-static
-int _lttng_channel_metadata_statedump(struct lttng_session *session,
- struct lttng_channel *chan)
-{
- 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;
- }
-
- ret = lttng_metadata_printf(session,
- "};\n\n");
-
- chan->metadata_dumped = 1;
-end:
- return ret;
-}
-
-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"
- );
-}
-
-/*
- * 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
- );
-}
-
-/*
- * 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)
-{
- uint64_t offset, monotonic[2], realtime;
- struct timespec rts = { 0, 0 };
- int ret;
-
- 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;
-}
-
-/*
- * Output metadata into this session's metadata buffers.
- */
-static
-int _lttng_session_metadata_statedump(struct lttng_session *session)
-{
- 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;
-
-skip_session:
- cds_list_for_each_entry(chan, &session->chan_head, node) {
- ret = _lttng_channel_metadata_statedump(session, chan);
- if (ret)
- goto end;
- }
-
- 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;
-}
-
void lttng_ust_events_exit(void)
{
struct lttng_session *session, *tmpsession;
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;
int lttng_enabler_disable(struct lttng_enabler *enabler)
{
- if (enabler->chan == enabler->chan->session->metadata)
- return -EPERM;
enabler->enabled = 0;
lttng_session_lazy_sync_enablers(enabler->chan->session);
return 0;
return 0;
}
+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;
+}
+
int lttng_attach_context(struct lttng_ust_context *context_param,
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);
default:
return -EINVAL;
}
void lttng_enabler_destroy(struct lttng_enabler *enabler)
{
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,
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);
lttng_enabler_ref_events(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,