2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; only version 2 of the License.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <lttng-share.h>
27 #include "hashtable.h"
28 #include "trace-ust.h"
31 * Find the channel in the hashtable.
33 struct ltt_ust_channel
*trace_ust_find_channel_by_name(struct cds_lfht
*ht
,
36 struct cds_lfht_node
*node
;
37 struct cds_lfht_iter iter
;
40 node
= hashtable_lookup(ht
, (void *) name
, strlen(name
), &iter
);
47 DBG2("Trace UST channel %s found by name", name
);
49 return caa_container_of(node
, struct ltt_ust_channel
, node
);
52 DBG2("Trace UST channel %s not found by name", name
);
57 * Find the event in the hashtable.
59 struct ltt_ust_event
*trace_ust_find_event_by_name(struct cds_lfht
*ht
,
62 struct cds_lfht_node
*node
;
63 struct cds_lfht_iter iter
;
66 node
= hashtable_lookup(ht
, (void *) name
, strlen(name
), &iter
);
73 DBG2("Found UST event by name %s", name
);
75 return caa_container_of(node
, struct ltt_ust_event
, node
);
82 * Allocate and initialize a ust session data structure.
84 * Return pointer to structure or NULL.
86 struct ltt_ust_session
*trace_ust_create_session(char *path
, pid_t pid
,
87 struct lttng_domain
*domain
)
90 struct ltt_ust_session
*lus
;
92 /* Allocate a new ltt ust session */
93 lus
= malloc(sizeof(struct ltt_ust_session
));
95 perror("create ust session malloc");
99 /* Init data structure */
102 lus
->consumer_fds_sent
= 0;
103 lus
->metadata
= NULL
;
105 /* Alloc UST domain hash tables */
106 lus
->domain_pid
= hashtable_new(0);
107 lus
->domain_exec
= hashtable_new_str(0);
109 /* Alloc UST global domain channels' HT */
110 lus
->domain_global
.channels
= hashtable_new_str(0);
112 /* Set session path */
113 ret
= snprintf(lus
->path
, PATH_MAX
, "%s/ust_%d", path
, pid
);
115 PERROR("snprintf kernel traces path");
119 DBG2("UST trace session create successful");
128 * Allocate and initialize a ust channel data structure.
130 * Return pointer to structure or NULL.
132 struct ltt_ust_channel
*trace_ust_create_channel(struct lttng_channel
*chan
,
136 struct ltt_ust_channel
*luc
;
138 luc
= malloc(sizeof(struct ltt_ust_channel
));
140 perror("ltt_ust_channel malloc");
144 /* Copy UST channel attributes */
145 memcpy(&luc
->attr
, &chan
->attr
, sizeof(struct lttng_ust_channel
));
147 /* Translate to UST output enum */
148 switch (luc
->attr
.output
) {
150 luc
->attr
.output
= LTTNG_UST_MMAP
;
157 /* Copy channel name */
158 strncpy(luc
->name
, chan
->name
, sizeof(&luc
->name
));
159 luc
->name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
162 hashtable_node_init(&luc
->node
, (void *) luc
->name
, strlen(luc
->name
));
163 /* Alloc hash tables */
164 luc
->events
= hashtable_new_str(0);
165 luc
->ctx
= hashtable_new_str(0);
167 /* Set trace output path */
168 ret
= snprintf(luc
->trace_path
, PATH_MAX
, "%s", path
);
170 perror("asprintf ust create channel");
173 CDS_INIT_LIST_HEAD(&luc
->stream_list
.head
);
175 DBG2("Trace UST channel %s created", luc
->name
);
184 * Allocate and initialize a ust event. Set name and event type.
186 * Return pointer to structure or NULL.
188 struct ltt_ust_event
*trace_ust_create_event(struct lttng_event
*ev
)
190 struct ltt_ust_event
*lue
;
192 lue
= malloc(sizeof(struct ltt_ust_event
));
194 PERROR("ust event malloc");
199 case LTTNG_EVENT_PROBE
:
200 lue
->attr
.instrumentation
= LTTNG_UST_PROBE
;
202 case LTTNG_EVENT_FUNCTION
:
203 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
205 case LTTNG_EVENT_FUNCTION_ENTRY
:
206 lue
->attr
.instrumentation
= LTTNG_UST_FUNCTION
;
208 case LTTNG_EVENT_TRACEPOINT
:
209 lue
->attr
.instrumentation
= LTTNG_UST_TRACEPOINT
;
212 ERR("Unknown ust instrumentation type (%d)", ev
->type
);
216 /* Copy event name */
217 strncpy(lue
->attr
.name
, ev
->name
, LTTNG_UST_SYM_NAME_LEN
);
218 lue
->attr
.name
[LTTNG_UST_SYM_NAME_LEN
- 1] = '\0';
220 /* Setting up a ust event */
225 hashtable_node_init(&lue
->node
, (void *) lue
->attr
.name
,
226 strlen(lue
->attr
.name
));
227 /* Alloc context hash tables */
228 lue
->ctx
= hashtable_new_str(5);
237 * Allocate and initialize a ust metadata.
239 * Return pointer to structure or NULL.
241 struct ltt_ust_metadata
*trace_ust_create_metadata(char *path
)
244 struct ltt_ust_metadata
*lum
;
246 lum
= malloc(sizeof(struct ltt_ust_metadata
));
248 perror("ust metadata malloc");
252 /* Set default attributes */
253 lum
->attr
.overwrite
= DEFAULT_CHANNEL_OVERWRITE
;
254 lum
->attr
.subbuf_size
= DEFAULT_METADATA_SUBBUF_SIZE
;
255 lum
->attr
.num_subbuf
= DEFAULT_METADATA_SUBBUF_NUM
;
256 lum
->attr
.switch_timer_interval
= DEFAULT_CHANNEL_SWITCH_TIMER
;
257 lum
->attr
.read_timer_interval
= DEFAULT_CHANNEL_READ_TIMER
;
258 lum
->attr
.output
= DEFAULT_UST_CHANNEL_OUTPUT
;
261 /* Set metadata trace path */
262 ret
= snprintf(lum
->pathname
, PATH_MAX
, "%s/metadata", path
);
264 perror("asprintf ust metadata");
275 * RCU safe free context structure.
277 static void destroy_context_rcu(struct rcu_head
*head
)
279 struct cds_lfht_node
*node
=
280 caa_container_of(head
, struct cds_lfht_node
, head
);
281 struct ltt_ust_context
*ctx
=
282 caa_container_of(node
, struct ltt_ust_context
, node
);
288 * Cleanup UST context hash table.
290 static void destroy_context(struct cds_lfht
*ht
)
293 struct cds_lfht_node
*node
;
294 struct cds_lfht_iter iter
;
296 hashtable_get_first(ht
, &iter
);
297 while ((node
= hashtable_iter_get_node(&iter
)) != NULL
) {
298 ret
= hashtable_del(ht
, &iter
);
300 call_rcu(&node
->head
, destroy_context_rcu
);
302 hashtable_get_next(ht
, &iter
);
307 * Cleanup ust event structure.
309 void trace_ust_destroy_event(struct ltt_ust_event
*event
)
311 DBG2("Trace destroy UST event %s", event
->attr
.name
);
312 destroy_context(event
->ctx
);
317 * URCU intermediate call to complete destroy event.
319 static void destroy_event_rcu(struct rcu_head
*head
)
321 struct cds_lfht_node
*node
=
322 caa_container_of(head
, struct cds_lfht_node
, head
);
323 struct ltt_ust_event
*event
=
324 caa_container_of(node
, struct ltt_ust_event
, node
);
326 trace_ust_destroy_event(event
);
330 * Cleanup ust channel structure.
332 void trace_ust_destroy_channel(struct ltt_ust_channel
*channel
)
335 struct cds_lfht_node
*node
;
336 struct cds_lfht_iter iter
;
338 DBG2("Trace destroy UST channel %s", channel
->name
);
342 hashtable_get_first(channel
->events
, &iter
);
343 while ((node
= hashtable_iter_get_node(&iter
)) != NULL
) {
344 ret
= hashtable_del(channel
->events
, &iter
);
346 call_rcu(&node
->head
, destroy_event_rcu
);
348 hashtable_get_next(channel
->events
, &iter
);
351 free(channel
->events
);
352 destroy_context(channel
->ctx
);
359 * URCU intermediate call to complete destroy channel.
361 static void destroy_channel_rcu(struct rcu_head
*head
)
363 struct cds_lfht_node
*node
=
364 caa_container_of(head
, struct cds_lfht_node
, head
);
365 struct ltt_ust_channel
*channel
=
366 caa_container_of(node
, struct ltt_ust_channel
, node
);
368 trace_ust_destroy_channel(channel
);
372 * Cleanup ust metadata structure.
374 void trace_ust_destroy_metadata(struct ltt_ust_metadata
*metadata
)
376 DBG2("Trace UST destroy metadata %d", metadata
->handle
);
382 * Iterate over a hash table containing channels and cleanup safely.
384 static void destroy_channels(struct cds_lfht
*channels
)
387 struct cds_lfht_node
*node
;
388 struct cds_lfht_iter iter
;
390 hashtable_get_first(channels
, &iter
);
391 while ((node
= hashtable_iter_get_node(&iter
)) != NULL
) {
392 ret
= hashtable_del(channels
, &iter
);
394 call_rcu(&node
->head
, destroy_channel_rcu
);
396 hashtable_get_next(channels
, &iter
);
401 * Cleanup UST pid domain.
403 static void destroy_domain_pid(struct cds_lfht
*ht
)
406 struct cds_lfht_node
*node
;
407 struct cds_lfht_iter iter
;
408 struct ltt_ust_domain_pid
*d
;
410 hashtable_get_first(ht
, &iter
);
411 while ((node
= hashtable_iter_get_node(&iter
)) != NULL
) {
412 ret
= hashtable_del(ht
, &iter
);
414 d
= caa_container_of(node
, struct ltt_ust_domain_pid
, node
);
415 destroy_channels(d
->channels
);
417 hashtable_get_next(ht
, &iter
);
422 * Cleanup UST exec name domain.
424 static void destroy_domain_exec(struct cds_lfht
*ht
)
427 struct cds_lfht_node
*node
;
428 struct cds_lfht_iter iter
;
429 struct ltt_ust_domain_exec
*d
;
431 hashtable_get_first(ht
, &iter
);
432 while ((node
= hashtable_iter_get_node(&iter
)) != NULL
) {
433 ret
= hashtable_del(ht
, &iter
);
435 d
= caa_container_of(node
, struct ltt_ust_domain_exec
, node
);
436 destroy_channels(d
->channels
);
438 hashtable_get_next(ht
, &iter
);
443 * Cleanup UST global domain.
445 static void destroy_domain_global(struct ltt_ust_domain_global
*dom
)
447 destroy_channels(dom
->channels
);
451 * Cleanup ust session structure
453 void trace_ust_destroy_session(struct ltt_ust_session
*session
)
456 if (session
== NULL
) {
462 DBG2("Trace UST destroy session %d", session
->handle
);
464 if (session
->metadata
!= NULL
) {
465 trace_ust_destroy_metadata(session
->metadata
);
468 /* Cleaning up UST domain */
469 destroy_domain_global(&session
->domain_global
);
470 destroy_domain_pid(session
->domain_pid
);
471 destroy_domain_exec(session
->domain_exec
);