Commit | Line | Data |
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331744e3 JD |
1 | /* |
2 | * Copyright (C) 2012 - Julien Desfossez <julien.desfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License, version 2 only, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
16 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
6c1c0768 | 20 | #define _LGPL_SOURCE |
331744e3 JD |
21 | #include <assert.h> |
22 | #include <inttypes.h> | |
23 | #include <signal.h> | |
24 | ||
51a9e1c7 | 25 | #include <bin/lttng-consumerd/health-consumerd.h> |
331744e3 | 26 | #include <common/common.h> |
f263b7fd | 27 | #include <common/compat/endian.h> |
d3e2ba59 JD |
28 | #include <common/kernel-ctl/kernel-ctl.h> |
29 | #include <common/kernel-consumer/kernel-consumer.h> | |
30 | #include <common/consumer-stream.h> | |
331744e3 JD |
31 | |
32 | #include "consumer-timer.h" | |
2d57de81 | 33 | #include "consumer-testpoint.h" |
331744e3 JD |
34 | #include "ust-consumer/ust-consumer.h" |
35 | ||
2b8f8754 MD |
36 | static struct timer_signal_data timer_signal = { |
37 | .tid = 0, | |
38 | .setup_done = 0, | |
39 | .qs_done = 0, | |
40 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
41 | }; | |
331744e3 JD |
42 | |
43 | /* | |
44 | * Set custom signal mask to current thread. | |
45 | */ | |
46 | static void setmask(sigset_t *mask) | |
47 | { | |
48 | int ret; | |
49 | ||
50 | ret = sigemptyset(mask); | |
51 | if (ret) { | |
52 | PERROR("sigemptyset"); | |
53 | } | |
54 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_SWITCH); | |
55 | if (ret) { | |
d3e2ba59 | 56 | PERROR("sigaddset switch"); |
331744e3 JD |
57 | } |
58 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_TEARDOWN); | |
59 | if (ret) { | |
d3e2ba59 JD |
60 | PERROR("sigaddset teardown"); |
61 | } | |
62 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_LIVE); | |
63 | if (ret) { | |
64 | PERROR("sigaddset live"); | |
331744e3 JD |
65 | } |
66 | } | |
67 | ||
68 | /* | |
69 | * Execute action on a timer switch. | |
d98a47c7 MD |
70 | * |
71 | * Beware: metadata_switch_timer() should *never* take a mutex also held | |
72 | * while consumer_timer_switch_stop() is called. It would result in | |
73 | * deadlocks. | |
331744e3 JD |
74 | */ |
75 | static void metadata_switch_timer(struct lttng_consumer_local_data *ctx, | |
76 | int sig, siginfo_t *si, void *uc) | |
77 | { | |
78 | int ret; | |
79 | struct lttng_consumer_channel *channel; | |
80 | ||
81 | channel = si->si_value.sival_ptr; | |
82 | assert(channel); | |
83 | ||
4419b4fb MD |
84 | if (channel->switch_timer_error) { |
85 | return; | |
86 | } | |
87 | ||
331744e3 JD |
88 | DBG("Switch timer for channel %" PRIu64, channel->key); |
89 | switch (ctx->type) { | |
90 | case LTTNG_CONSUMER32_UST: | |
91 | case LTTNG_CONSUMER64_UST: | |
4fa3dc0e MD |
92 | /* |
93 | * Locks taken by lttng_ustconsumer_request_metadata(): | |
94 | * - metadata_socket_lock | |
95 | * - Calling lttng_ustconsumer_recv_metadata(): | |
f82d9449 | 96 | * - channel->metadata_cache->lock |
4fa3dc0e | 97 | * - Calling consumer_metadata_cache_flushed(): |
5e41ebe1 MD |
98 | * - channel->timer_lock |
99 | * - channel->metadata_cache->lock | |
4fa3dc0e | 100 | * |
5e41ebe1 MD |
101 | * Ensure that neither consumer_data.lock nor |
102 | * channel->lock are taken within this function, since | |
103 | * they are held while consumer_timer_switch_stop() is | |
104 | * called. | |
4fa3dc0e | 105 | */ |
94d49140 | 106 | ret = lttng_ustconsumer_request_metadata(ctx, channel, 1, 1); |
331744e3 | 107 | if (ret < 0) { |
4419b4fb | 108 | channel->switch_timer_error = 1; |
331744e3 JD |
109 | } |
110 | break; | |
111 | case LTTNG_CONSUMER_KERNEL: | |
112 | case LTTNG_CONSUMER_UNKNOWN: | |
113 | assert(0); | |
114 | break; | |
115 | } | |
116 | } | |
117 | ||
528f2ffa JD |
118 | static int send_empty_index(struct lttng_consumer_stream *stream, uint64_t ts, |
119 | uint64_t stream_id) | |
d3e2ba59 JD |
120 | { |
121 | int ret; | |
50adc264 | 122 | struct ctf_packet_index index; |
d3e2ba59 JD |
123 | |
124 | memset(&index, 0, sizeof(index)); | |
528f2ffa | 125 | index.stream_id = htobe64(stream_id); |
d3e2ba59 JD |
126 | index.timestamp_end = htobe64(ts); |
127 | ret = consumer_stream_write_index(stream, &index); | |
128 | if (ret < 0) { | |
129 | goto error; | |
130 | } | |
131 | ||
132 | error: | |
133 | return ret; | |
134 | } | |
135 | ||
136 | static int check_kernel_stream(struct lttng_consumer_stream *stream) | |
137 | { | |
528f2ffa | 138 | uint64_t ts, stream_id; |
d3e2ba59 JD |
139 | int ret; |
140 | ||
141 | /* | |
142 | * While holding the stream mutex, try to take a snapshot, if it | |
143 | * succeeds, it means that data is ready to be sent, just let the data | |
144 | * thread handle that. Otherwise, if the snapshot returns EAGAIN, it | |
145 | * means that there is no data to read after the flush, so we can | |
146 | * safely send the empty index. | |
147 | */ | |
148 | pthread_mutex_lock(&stream->lock); | |
149 | ret = kernctl_get_current_timestamp(stream->wait_fd, &ts); | |
150 | if (ret < 0) { | |
151 | ERR("Failed to get the current timestamp"); | |
152 | goto error_unlock; | |
153 | } | |
154 | ret = kernctl_buffer_flush(stream->wait_fd); | |
155 | if (ret < 0) { | |
156 | ERR("Failed to flush kernel stream"); | |
157 | goto error_unlock; | |
158 | } | |
159 | ret = kernctl_snapshot(stream->wait_fd); | |
160 | if (ret < 0) { | |
08b1dcd3 DG |
161 | if (errno != EAGAIN && errno != ENODATA) { |
162 | PERROR("live timer kernel snapshot"); | |
d3e2ba59 JD |
163 | ret = -1; |
164 | goto error_unlock; | |
165 | } | |
528f2ffa JD |
166 | ret = kernctl_get_stream_id(stream->wait_fd, &stream_id); |
167 | if (ret < 0) { | |
168 | PERROR("kernctl_get_stream_id"); | |
169 | goto error_unlock; | |
170 | } | |
d3e2ba59 | 171 | DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); |
528f2ffa | 172 | ret = send_empty_index(stream, ts, stream_id); |
d3e2ba59 JD |
173 | if (ret < 0) { |
174 | goto error_unlock; | |
175 | } | |
176 | } | |
177 | ret = 0; | |
178 | ||
179 | error_unlock: | |
180 | pthread_mutex_unlock(&stream->lock); | |
181 | return ret; | |
182 | } | |
183 | ||
184 | static int check_ust_stream(struct lttng_consumer_stream *stream) | |
185 | { | |
528f2ffa | 186 | uint64_t ts, stream_id; |
d3e2ba59 JD |
187 | int ret; |
188 | ||
189 | assert(stream); | |
190 | assert(stream->ustream); | |
191 | /* | |
192 | * While holding the stream mutex, try to take a snapshot, if it | |
193 | * succeeds, it means that data is ready to be sent, just let the data | |
194 | * thread handle that. Otherwise, if the snapshot returns EAGAIN, it | |
195 | * means that there is no data to read after the flush, so we can | |
196 | * safely send the empty index. | |
197 | */ | |
198 | pthread_mutex_lock(&stream->lock); | |
94d49140 JD |
199 | ret = cds_lfht_is_node_deleted(&stream->node.node); |
200 | if (ret) { | |
201 | goto error_unlock; | |
202 | } | |
203 | ||
84a182ce | 204 | ret = lttng_ustconsumer_get_current_timestamp(stream, &ts); |
d3e2ba59 JD |
205 | if (ret < 0) { |
206 | ERR("Failed to get the current timestamp"); | |
207 | goto error_unlock; | |
208 | } | |
84a182ce DG |
209 | lttng_ustconsumer_flush_buffer(stream, 1); |
210 | ret = lttng_ustconsumer_take_snapshot(stream); | |
d3e2ba59 | 211 | if (ret < 0) { |
94d49140 | 212 | if (ret != -EAGAIN) { |
d3e2ba59 JD |
213 | ERR("Taking UST snapshot"); |
214 | ret = -1; | |
215 | goto error_unlock; | |
216 | } | |
70190e1c | 217 | ret = lttng_ustconsumer_get_stream_id(stream, &stream_id); |
528f2ffa JD |
218 | if (ret < 0) { |
219 | PERROR("ustctl_get_stream_id"); | |
220 | goto error_unlock; | |
221 | } | |
d3e2ba59 | 222 | DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); |
528f2ffa | 223 | ret = send_empty_index(stream, ts, stream_id); |
d3e2ba59 JD |
224 | if (ret < 0) { |
225 | goto error_unlock; | |
226 | } | |
227 | } | |
228 | ret = 0; | |
229 | ||
230 | error_unlock: | |
231 | pthread_mutex_unlock(&stream->lock); | |
232 | return ret; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Execute action on a live timer | |
237 | */ | |
238 | static void live_timer(struct lttng_consumer_local_data *ctx, | |
239 | int sig, siginfo_t *si, void *uc) | |
240 | { | |
241 | int ret; | |
242 | struct lttng_consumer_channel *channel; | |
243 | struct lttng_consumer_stream *stream; | |
244 | struct lttng_ht *ht; | |
245 | struct lttng_ht_iter iter; | |
246 | ||
247 | channel = si->si_value.sival_ptr; | |
248 | assert(channel); | |
249 | ||
250 | if (channel->switch_timer_error) { | |
251 | goto error; | |
252 | } | |
253 | ht = consumer_data.stream_per_chan_id_ht; | |
254 | ||
255 | DBG("Live timer for channel %" PRIu64, channel->key); | |
256 | ||
257 | rcu_read_lock(); | |
258 | switch (ctx->type) { | |
259 | case LTTNG_CONSUMER32_UST: | |
260 | case LTTNG_CONSUMER64_UST: | |
261 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
262 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
263 | ht->match_fct, &channel->key, &iter.iter, | |
264 | stream, node_channel_id.node) { | |
265 | ret = check_ust_stream(stream); | |
266 | if (ret < 0) { | |
267 | goto error_unlock; | |
268 | } | |
269 | } | |
270 | break; | |
271 | case LTTNG_CONSUMER_KERNEL: | |
272 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
273 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
274 | ht->match_fct, &channel->key, &iter.iter, | |
275 | stream, node_channel_id.node) { | |
276 | ret = check_kernel_stream(stream); | |
277 | if (ret < 0) { | |
278 | goto error_unlock; | |
279 | } | |
280 | } | |
281 | break; | |
282 | case LTTNG_CONSUMER_UNKNOWN: | |
283 | assert(0); | |
284 | break; | |
285 | } | |
286 | ||
287 | error_unlock: | |
288 | rcu_read_unlock(); | |
289 | ||
290 | error: | |
291 | return; | |
292 | } | |
293 | ||
2b8f8754 MD |
294 | static |
295 | void consumer_timer_signal_thread_qs(unsigned int signr) | |
296 | { | |
297 | sigset_t pending_set; | |
298 | int ret; | |
299 | ||
300 | /* | |
301 | * We need to be the only thread interacting with the thread | |
302 | * that manages signals for teardown synchronization. | |
303 | */ | |
304 | pthread_mutex_lock(&timer_signal.lock); | |
305 | ||
306 | /* Ensure we don't have any signal queued for this channel. */ | |
307 | for (;;) { | |
308 | ret = sigemptyset(&pending_set); | |
309 | if (ret == -1) { | |
310 | PERROR("sigemptyset"); | |
311 | } | |
312 | ret = sigpending(&pending_set); | |
313 | if (ret == -1) { | |
314 | PERROR("sigpending"); | |
315 | } | |
316 | if (!sigismember(&pending_set, LTTNG_CONSUMER_SIG_SWITCH)) { | |
317 | break; | |
318 | } | |
319 | caa_cpu_relax(); | |
320 | } | |
321 | ||
322 | /* | |
323 | * From this point, no new signal handler will be fired that would try to | |
324 | * access "chan". However, we still need to wait for any currently | |
325 | * executing handler to complete. | |
326 | */ | |
327 | cmm_smp_mb(); | |
328 | CMM_STORE_SHARED(timer_signal.qs_done, 0); | |
329 | cmm_smp_mb(); | |
330 | ||
331 | /* | |
332 | * Kill with LTTNG_CONSUMER_SIG_TEARDOWN, so signal management thread wakes | |
333 | * up. | |
334 | */ | |
335 | kill(getpid(), LTTNG_CONSUMER_SIG_TEARDOWN); | |
336 | ||
337 | while (!CMM_LOAD_SHARED(timer_signal.qs_done)) { | |
338 | caa_cpu_relax(); | |
339 | } | |
340 | cmm_smp_mb(); | |
341 | ||
342 | pthread_mutex_unlock(&timer_signal.lock); | |
343 | } | |
344 | ||
331744e3 JD |
345 | /* |
346 | * Set the timer for periodical metadata flush. | |
347 | */ | |
348 | void consumer_timer_switch_start(struct lttng_consumer_channel *channel, | |
349 | unsigned int switch_timer_interval) | |
350 | { | |
351 | int ret; | |
352 | struct sigevent sev; | |
353 | struct itimerspec its; | |
354 | ||
355 | assert(channel); | |
356 | assert(channel->key); | |
357 | ||
358 | if (switch_timer_interval == 0) { | |
359 | return; | |
360 | } | |
361 | ||
362 | sev.sigev_notify = SIGEV_SIGNAL; | |
363 | sev.sigev_signo = LTTNG_CONSUMER_SIG_SWITCH; | |
364 | sev.sigev_value.sival_ptr = channel; | |
365 | ret = timer_create(CLOCKID, &sev, &channel->switch_timer); | |
366 | if (ret == -1) { | |
367 | PERROR("timer_create"); | |
368 | } | |
369 | channel->switch_timer_enabled = 1; | |
370 | ||
371 | its.it_value.tv_sec = switch_timer_interval / 1000000; | |
372 | its.it_value.tv_nsec = switch_timer_interval % 1000000; | |
373 | its.it_interval.tv_sec = its.it_value.tv_sec; | |
374 | its.it_interval.tv_nsec = its.it_value.tv_nsec; | |
375 | ||
376 | ret = timer_settime(channel->switch_timer, 0, &its, NULL); | |
377 | if (ret == -1) { | |
378 | PERROR("timer_settime"); | |
379 | } | |
380 | } | |
381 | ||
382 | /* | |
383 | * Stop and delete timer. | |
384 | */ | |
385 | void consumer_timer_switch_stop(struct lttng_consumer_channel *channel) | |
386 | { | |
387 | int ret; | |
331744e3 JD |
388 | |
389 | assert(channel); | |
390 | ||
391 | ret = timer_delete(channel->switch_timer); | |
392 | if (ret == -1) { | |
393 | PERROR("timer_delete"); | |
394 | } | |
395 | ||
2b8f8754 | 396 | consumer_timer_signal_thread_qs(LTTNG_CONSUMER_SIG_SWITCH); |
331744e3 | 397 | |
2b8f8754 MD |
398 | channel->switch_timer = 0; |
399 | channel->switch_timer_enabled = 0; | |
331744e3 JD |
400 | } |
401 | ||
d3e2ba59 JD |
402 | /* |
403 | * Set the timer for the live mode. | |
404 | */ | |
405 | void consumer_timer_live_start(struct lttng_consumer_channel *channel, | |
406 | int live_timer_interval) | |
407 | { | |
408 | int ret; | |
409 | struct sigevent sev; | |
410 | struct itimerspec its; | |
411 | ||
412 | assert(channel); | |
413 | assert(channel->key); | |
414 | ||
fac41e72 | 415 | if (live_timer_interval <= 0) { |
d3e2ba59 JD |
416 | return; |
417 | } | |
418 | ||
419 | sev.sigev_notify = SIGEV_SIGNAL; | |
420 | sev.sigev_signo = LTTNG_CONSUMER_SIG_LIVE; | |
421 | sev.sigev_value.sival_ptr = channel; | |
422 | ret = timer_create(CLOCKID, &sev, &channel->live_timer); | |
423 | if (ret == -1) { | |
424 | PERROR("timer_create"); | |
425 | } | |
426 | channel->live_timer_enabled = 1; | |
427 | ||
428 | its.it_value.tv_sec = live_timer_interval / 1000000; | |
429 | its.it_value.tv_nsec = live_timer_interval % 1000000; | |
430 | its.it_interval.tv_sec = its.it_value.tv_sec; | |
431 | its.it_interval.tv_nsec = its.it_value.tv_nsec; | |
432 | ||
433 | ret = timer_settime(channel->live_timer, 0, &its, NULL); | |
434 | if (ret == -1) { | |
435 | PERROR("timer_settime"); | |
436 | } | |
437 | } | |
438 | ||
439 | /* | |
440 | * Stop and delete timer. | |
441 | */ | |
442 | void consumer_timer_live_stop(struct lttng_consumer_channel *channel) | |
443 | { | |
444 | int ret; | |
445 | ||
446 | assert(channel); | |
447 | ||
448 | ret = timer_delete(channel->live_timer); | |
449 | if (ret == -1) { | |
450 | PERROR("timer_delete"); | |
451 | } | |
452 | ||
453 | consumer_timer_signal_thread_qs(LTTNG_CONSUMER_SIG_LIVE); | |
454 | ||
455 | channel->live_timer = 0; | |
456 | channel->live_timer_enabled = 0; | |
457 | } | |
458 | ||
331744e3 JD |
459 | /* |
460 | * Block the RT signals for the entire process. It must be called from the | |
461 | * consumer main before creating the threads | |
462 | */ | |
463 | void consumer_signal_init(void) | |
464 | { | |
465 | int ret; | |
466 | sigset_t mask; | |
467 | ||
468 | /* Block signal for entire process, so only our thread processes it. */ | |
469 | setmask(&mask); | |
470 | ret = pthread_sigmask(SIG_BLOCK, &mask, NULL); | |
471 | if (ret) { | |
472 | errno = ret; | |
473 | PERROR("pthread_sigmask"); | |
474 | } | |
475 | } | |
476 | ||
477 | /* | |
d3e2ba59 JD |
478 | * This thread is the sighandler for signals LTTNG_CONSUMER_SIG_SWITCH, |
479 | * LTTNG_CONSUMER_SIG_TEARDOWN and LTTNG_CONSUMER_SIG_LIVE. | |
331744e3 | 480 | */ |
d3e2ba59 | 481 | void *consumer_timer_thread(void *data) |
331744e3 JD |
482 | { |
483 | int signr; | |
484 | sigset_t mask; | |
485 | siginfo_t info; | |
486 | struct lttng_consumer_local_data *ctx = data; | |
487 | ||
1fc79fb4 MD |
488 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); |
489 | ||
2d57de81 MD |
490 | if (testpoint(consumerd_thread_metadata_timer)) { |
491 | goto error_testpoint; | |
492 | } | |
493 | ||
9ce5646a MD |
494 | health_code_update(); |
495 | ||
331744e3 JD |
496 | /* Only self thread will receive signal mask. */ |
497 | setmask(&mask); | |
498 | CMM_STORE_SHARED(timer_signal.tid, pthread_self()); | |
499 | ||
500 | while (1) { | |
9ce5646a MD |
501 | health_code_update(); |
502 | ||
503 | health_poll_entry(); | |
331744e3 | 504 | signr = sigwaitinfo(&mask, &info); |
9ce5646a | 505 | health_poll_exit(); |
331744e3 JD |
506 | if (signr == -1) { |
507 | if (errno != EINTR) { | |
508 | PERROR("sigwaitinfo"); | |
509 | } | |
510 | continue; | |
511 | } else if (signr == LTTNG_CONSUMER_SIG_SWITCH) { | |
512 | metadata_switch_timer(ctx, info.si_signo, &info, NULL); | |
513 | } else if (signr == LTTNG_CONSUMER_SIG_TEARDOWN) { | |
514 | cmm_smp_mb(); | |
515 | CMM_STORE_SHARED(timer_signal.qs_done, 1); | |
516 | cmm_smp_mb(); | |
517 | DBG("Signal timer metadata thread teardown"); | |
d3e2ba59 JD |
518 | } else if (signr == LTTNG_CONSUMER_SIG_LIVE) { |
519 | live_timer(ctx, info.si_signo, &info, NULL); | |
331744e3 JD |
520 | } else { |
521 | ERR("Unexpected signal %d\n", info.si_signo); | |
522 | } | |
523 | } | |
524 | ||
2d57de81 MD |
525 | error_testpoint: |
526 | /* Only reached in testpoint error */ | |
527 | health_error(); | |
1fc79fb4 MD |
528 | health_unregister(health_consumerd); |
529 | ||
530 | /* Never return */ | |
331744e3 JD |
531 | return NULL; |
532 | } |