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 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
331744e3 JD |
20 | #include <assert.h> |
21 | #include <inttypes.h> | |
22 | #include <signal.h> | |
23 | ||
51a9e1c7 | 24 | #include <bin/lttng-consumerd/health-consumerd.h> |
331744e3 | 25 | #include <common/common.h> |
f263b7fd | 26 | #include <common/compat/endian.h> |
d3e2ba59 JD |
27 | #include <common/kernel-ctl/kernel-ctl.h> |
28 | #include <common/kernel-consumer/kernel-consumer.h> | |
c8fea79c JR |
29 | #include <common/consumer/consumer-stream.h> |
30 | #include <common/consumer/consumer-timer.h> | |
31 | #include <common/consumer/consumer-testpoint.h> | |
32 | #include <common/ust-consumer/ust-consumer.h> | |
331744e3 | 33 | |
e9404c27 JG |
34 | typedef int (*sample_positions_cb)(struct lttng_consumer_stream *stream); |
35 | typedef int (*get_consumed_cb)(struct lttng_consumer_stream *stream, | |
36 | unsigned long *consumed); | |
37 | typedef int (*get_produced_cb)(struct lttng_consumer_stream *stream, | |
38 | unsigned long *produced); | |
bb09693b | 39 | typedef int (*flush_index_cb)(struct lttng_consumer_stream *stream); |
e9404c27 | 40 | |
2b8f8754 MD |
41 | static struct timer_signal_data timer_signal = { |
42 | .tid = 0, | |
43 | .setup_done = 0, | |
44 | .qs_done = 0, | |
45 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
46 | }; | |
331744e3 JD |
47 | |
48 | /* | |
49 | * Set custom signal mask to current thread. | |
50 | */ | |
51 | static void setmask(sigset_t *mask) | |
52 | { | |
53 | int ret; | |
54 | ||
55 | ret = sigemptyset(mask); | |
56 | if (ret) { | |
57 | PERROR("sigemptyset"); | |
58 | } | |
59 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_SWITCH); | |
60 | if (ret) { | |
d3e2ba59 | 61 | PERROR("sigaddset switch"); |
331744e3 JD |
62 | } |
63 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_TEARDOWN); | |
64 | if (ret) { | |
d3e2ba59 JD |
65 | PERROR("sigaddset teardown"); |
66 | } | |
67 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_LIVE); | |
68 | if (ret) { | |
69 | PERROR("sigaddset live"); | |
331744e3 | 70 | } |
e9404c27 JG |
71 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_MONITOR); |
72 | if (ret) { | |
73 | PERROR("sigaddset monitor"); | |
74 | } | |
13675d0e MD |
75 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_EXIT); |
76 | if (ret) { | |
77 | PERROR("sigaddset exit"); | |
78 | } | |
331744e3 JD |
79 | } |
80 | ||
e9404c27 JG |
81 | static int channel_monitor_pipe = -1; |
82 | ||
331744e3 JD |
83 | /* |
84 | * Execute action on a timer switch. | |
d98a47c7 MD |
85 | * |
86 | * Beware: metadata_switch_timer() should *never* take a mutex also held | |
87 | * while consumer_timer_switch_stop() is called. It would result in | |
88 | * deadlocks. | |
331744e3 JD |
89 | */ |
90 | static void metadata_switch_timer(struct lttng_consumer_local_data *ctx, | |
d7e2822f | 91 | siginfo_t *si) |
331744e3 JD |
92 | { |
93 | int ret; | |
94 | struct lttng_consumer_channel *channel; | |
95 | ||
96 | channel = si->si_value.sival_ptr; | |
97 | assert(channel); | |
98 | ||
4419b4fb MD |
99 | if (channel->switch_timer_error) { |
100 | return; | |
101 | } | |
102 | ||
331744e3 JD |
103 | DBG("Switch timer for channel %" PRIu64, channel->key); |
104 | switch (ctx->type) { | |
105 | case LTTNG_CONSUMER32_UST: | |
106 | case LTTNG_CONSUMER64_UST: | |
4fa3dc0e MD |
107 | /* |
108 | * Locks taken by lttng_ustconsumer_request_metadata(): | |
109 | * - metadata_socket_lock | |
110 | * - Calling lttng_ustconsumer_recv_metadata(): | |
f82d9449 | 111 | * - channel->metadata_cache->lock |
4fa3dc0e | 112 | * - Calling consumer_metadata_cache_flushed(): |
5e41ebe1 MD |
113 | * - channel->timer_lock |
114 | * - channel->metadata_cache->lock | |
4fa3dc0e | 115 | * |
5e41ebe1 MD |
116 | * Ensure that neither consumer_data.lock nor |
117 | * channel->lock are taken within this function, since | |
118 | * they are held while consumer_timer_switch_stop() is | |
119 | * called. | |
4fa3dc0e | 120 | */ |
94d49140 | 121 | ret = lttng_ustconsumer_request_metadata(ctx, channel, 1, 1); |
331744e3 | 122 | if (ret < 0) { |
4419b4fb | 123 | channel->switch_timer_error = 1; |
331744e3 JD |
124 | } |
125 | break; | |
126 | case LTTNG_CONSUMER_KERNEL: | |
127 | case LTTNG_CONSUMER_UNKNOWN: | |
128 | assert(0); | |
129 | break; | |
130 | } | |
131 | } | |
132 | ||
528f2ffa JD |
133 | static int send_empty_index(struct lttng_consumer_stream *stream, uint64_t ts, |
134 | uint64_t stream_id) | |
d3e2ba59 JD |
135 | { |
136 | int ret; | |
50adc264 | 137 | struct ctf_packet_index index; |
d3e2ba59 JD |
138 | |
139 | memset(&index, 0, sizeof(index)); | |
528f2ffa | 140 | index.stream_id = htobe64(stream_id); |
d3e2ba59 JD |
141 | index.timestamp_end = htobe64(ts); |
142 | ret = consumer_stream_write_index(stream, &index); | |
143 | if (ret < 0) { | |
144 | goto error; | |
145 | } | |
146 | ||
147 | error: | |
148 | return ret; | |
149 | } | |
150 | ||
c585821b | 151 | int consumer_flush_kernel_index(struct lttng_consumer_stream *stream) |
d3e2ba59 | 152 | { |
528f2ffa | 153 | uint64_t ts, stream_id; |
d3e2ba59 JD |
154 | int ret; |
155 | ||
d3e2ba59 JD |
156 | ret = kernctl_get_current_timestamp(stream->wait_fd, &ts); |
157 | if (ret < 0) { | |
158 | ERR("Failed to get the current timestamp"); | |
c585821b | 159 | goto end; |
d3e2ba59 JD |
160 | } |
161 | ret = kernctl_buffer_flush(stream->wait_fd); | |
162 | if (ret < 0) { | |
163 | ERR("Failed to flush kernel stream"); | |
c585821b | 164 | goto end; |
d3e2ba59 JD |
165 | } |
166 | ret = kernctl_snapshot(stream->wait_fd); | |
167 | if (ret < 0) { | |
32af2c95 | 168 | if (ret != -EAGAIN && ret != -ENODATA) { |
08b1dcd3 | 169 | PERROR("live timer kernel snapshot"); |
d3e2ba59 | 170 | ret = -1; |
c585821b | 171 | goto end; |
d3e2ba59 | 172 | } |
528f2ffa JD |
173 | ret = kernctl_get_stream_id(stream->wait_fd, &stream_id); |
174 | if (ret < 0) { | |
175 | PERROR("kernctl_get_stream_id"); | |
c585821b | 176 | goto end; |
528f2ffa | 177 | } |
d3e2ba59 | 178 | DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); |
528f2ffa | 179 | ret = send_empty_index(stream, ts, stream_id); |
d3e2ba59 | 180 | if (ret < 0) { |
c585821b | 181 | goto end; |
d3e2ba59 JD |
182 | } |
183 | } | |
184 | ret = 0; | |
c585821b | 185 | end: |
d3e2ba59 JD |
186 | return ret; |
187 | } | |
188 | ||
bb09693b JG |
189 | static int check_stream(struct lttng_consumer_stream *stream, |
190 | flush_index_cb flush_index) | |
d3e2ba59 | 191 | { |
d3e2ba59 JD |
192 | int ret; |
193 | ||
d3e2ba59 JD |
194 | /* |
195 | * While holding the stream mutex, try to take a snapshot, if it | |
196 | * succeeds, it means that data is ready to be sent, just let the data | |
197 | * thread handle that. Otherwise, if the snapshot returns EAGAIN, it | |
198 | * means that there is no data to read after the flush, so we can | |
199 | * safely send the empty index. | |
c585821b MD |
200 | * |
201 | * Doing a trylock and checking if waiting on metadata if | |
202 | * trylock fails. Bail out of the stream is indeed waiting for | |
203 | * metadata to be pushed. Busy wait on trylock otherwise. | |
d3e2ba59 | 204 | */ |
c585821b MD |
205 | for (;;) { |
206 | ret = pthread_mutex_trylock(&stream->lock); | |
207 | switch (ret) { | |
208 | case 0: | |
209 | break; /* We have the lock. */ | |
210 | case EBUSY: | |
211 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
212 | if (stream->waiting_on_metadata) { | |
213 | ret = 0; | |
214 | stream->missed_metadata_flush = true; | |
215 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
216 | goto end; /* Bail out. */ | |
217 | } | |
218 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
219 | /* Try again. */ | |
220 | caa_cpu_relax(); | |
221 | continue; | |
222 | default: | |
223 | ERR("Unexpected pthread_mutex_trylock error %d", ret); | |
224 | ret = -1; | |
225 | goto end; | |
226 | } | |
227 | break; | |
228 | } | |
bb09693b | 229 | ret = flush_index(stream); |
c585821b MD |
230 | pthread_mutex_unlock(&stream->lock); |
231 | end: | |
232 | return ret; | |
233 | } | |
234 | ||
235 | int consumer_flush_ust_index(struct lttng_consumer_stream *stream) | |
236 | { | |
237 | uint64_t ts, stream_id; | |
238 | int ret; | |
239 | ||
94d49140 JD |
240 | ret = cds_lfht_is_node_deleted(&stream->node.node); |
241 | if (ret) { | |
c585821b | 242 | goto end; |
94d49140 JD |
243 | } |
244 | ||
84a182ce | 245 | ret = lttng_ustconsumer_get_current_timestamp(stream, &ts); |
d3e2ba59 JD |
246 | if (ret < 0) { |
247 | ERR("Failed to get the current timestamp"); | |
c585821b | 248 | goto end; |
d3e2ba59 | 249 | } |
84a182ce DG |
250 | lttng_ustconsumer_flush_buffer(stream, 1); |
251 | ret = lttng_ustconsumer_take_snapshot(stream); | |
d3e2ba59 | 252 | if (ret < 0) { |
94d49140 | 253 | if (ret != -EAGAIN) { |
d3e2ba59 JD |
254 | ERR("Taking UST snapshot"); |
255 | ret = -1; | |
c585821b | 256 | goto end; |
d3e2ba59 | 257 | } |
70190e1c | 258 | ret = lttng_ustconsumer_get_stream_id(stream, &stream_id); |
528f2ffa JD |
259 | if (ret < 0) { |
260 | PERROR("ustctl_get_stream_id"); | |
c585821b | 261 | goto end; |
528f2ffa | 262 | } |
d3e2ba59 | 263 | DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); |
528f2ffa | 264 | ret = send_empty_index(stream, ts, stream_id); |
d3e2ba59 | 265 | if (ret < 0) { |
c585821b | 266 | goto end; |
d3e2ba59 JD |
267 | } |
268 | } | |
269 | ret = 0; | |
c585821b MD |
270 | end: |
271 | return ret; | |
272 | } | |
d3e2ba59 | 273 | |
d3e2ba59 JD |
274 | /* |
275 | * Execute action on a live timer | |
276 | */ | |
277 | static void live_timer(struct lttng_consumer_local_data *ctx, | |
d7e2822f | 278 | siginfo_t *si) |
d3e2ba59 JD |
279 | { |
280 | int ret; | |
281 | struct lttng_consumer_channel *channel; | |
282 | struct lttng_consumer_stream *stream; | |
d3e2ba59 | 283 | struct lttng_ht_iter iter; |
bb09693b JG |
284 | const struct lttng_ht *ht = consumer_data.stream_per_chan_id_ht; |
285 | const flush_index_cb flush_index = | |
286 | ctx->type == LTTNG_CONSUMER_KERNEL ? | |
287 | consumer_flush_kernel_index : | |
288 | consumer_flush_ust_index; | |
d3e2ba59 JD |
289 | |
290 | channel = si->si_value.sival_ptr; | |
291 | assert(channel); | |
292 | ||
293 | if (channel->switch_timer_error) { | |
294 | goto error; | |
295 | } | |
d3e2ba59 JD |
296 | |
297 | DBG("Live timer for channel %" PRIu64, channel->key); | |
298 | ||
299 | rcu_read_lock(); | |
bb09693b JG |
300 | cds_lfht_for_each_entry_duplicate(ht->ht, |
301 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
302 | ht->match_fct, &channel->key, &iter.iter, | |
303 | stream, node_channel_id.node) { | |
304 | ret = check_stream(stream, flush_index); | |
305 | if (ret < 0) { | |
306 | goto error_unlock; | |
d3e2ba59 | 307 | } |
d3e2ba59 JD |
308 | } |
309 | ||
310 | error_unlock: | |
311 | rcu_read_unlock(); | |
312 | ||
313 | error: | |
314 | return; | |
315 | } | |
316 | ||
2b8f8754 MD |
317 | static |
318 | void consumer_timer_signal_thread_qs(unsigned int signr) | |
319 | { | |
320 | sigset_t pending_set; | |
321 | int ret; | |
322 | ||
323 | /* | |
324 | * We need to be the only thread interacting with the thread | |
325 | * that manages signals for teardown synchronization. | |
326 | */ | |
327 | pthread_mutex_lock(&timer_signal.lock); | |
328 | ||
329 | /* Ensure we don't have any signal queued for this channel. */ | |
330 | for (;;) { | |
331 | ret = sigemptyset(&pending_set); | |
332 | if (ret == -1) { | |
333 | PERROR("sigemptyset"); | |
334 | } | |
335 | ret = sigpending(&pending_set); | |
336 | if (ret == -1) { | |
337 | PERROR("sigpending"); | |
338 | } | |
f05a6b6d | 339 | if (!sigismember(&pending_set, signr)) { |
2b8f8754 MD |
340 | break; |
341 | } | |
342 | caa_cpu_relax(); | |
343 | } | |
344 | ||
345 | /* | |
346 | * From this point, no new signal handler will be fired that would try to | |
347 | * access "chan". However, we still need to wait for any currently | |
348 | * executing handler to complete. | |
349 | */ | |
350 | cmm_smp_mb(); | |
351 | CMM_STORE_SHARED(timer_signal.qs_done, 0); | |
352 | cmm_smp_mb(); | |
353 | ||
354 | /* | |
355 | * Kill with LTTNG_CONSUMER_SIG_TEARDOWN, so signal management thread wakes | |
356 | * up. | |
357 | */ | |
358 | kill(getpid(), LTTNG_CONSUMER_SIG_TEARDOWN); | |
359 | ||
360 | while (!CMM_LOAD_SHARED(timer_signal.qs_done)) { | |
361 | caa_cpu_relax(); | |
362 | } | |
363 | cmm_smp_mb(); | |
364 | ||
365 | pthread_mutex_unlock(&timer_signal.lock); | |
366 | } | |
367 | ||
331744e3 | 368 | /* |
e9404c27 JG |
369 | * Start a timer channel timer which will fire at a given interval |
370 | * (timer_interval_us)and fire a given signal (signal). | |
371 | * | |
372 | * Returns a negative value on error, 0 if a timer was created, and | |
373 | * a positive value if no timer was created (not an error). | |
331744e3 | 374 | */ |
e9404c27 JG |
375 | static |
376 | int consumer_channel_timer_start(timer_t *timer_id, | |
377 | struct lttng_consumer_channel *channel, | |
378 | unsigned int timer_interval_us, int signal) | |
331744e3 | 379 | { |
e9404c27 | 380 | int ret = 0, delete_ret; |
331744e3 JD |
381 | struct sigevent sev; |
382 | struct itimerspec its; | |
383 | ||
384 | assert(channel); | |
385 | assert(channel->key); | |
386 | ||
e9404c27 JG |
387 | if (timer_interval_us == 0) { |
388 | /* No creation needed; not an error. */ | |
389 | ret = 1; | |
390 | goto end; | |
331744e3 JD |
391 | } |
392 | ||
393 | sev.sigev_notify = SIGEV_SIGNAL; | |
e9404c27 | 394 | sev.sigev_signo = signal; |
331744e3 | 395 | sev.sigev_value.sival_ptr = channel; |
e9404c27 | 396 | ret = timer_create(CLOCKID, &sev, timer_id); |
331744e3 JD |
397 | if (ret == -1) { |
398 | PERROR("timer_create"); | |
e9404c27 | 399 | goto end; |
331744e3 | 400 | } |
331744e3 | 401 | |
e9404c27 JG |
402 | its.it_value.tv_sec = timer_interval_us / 1000000; |
403 | its.it_value.tv_nsec = (timer_interval_us % 1000000) * 1000; | |
331744e3 JD |
404 | its.it_interval.tv_sec = its.it_value.tv_sec; |
405 | its.it_interval.tv_nsec = its.it_value.tv_nsec; | |
406 | ||
e9404c27 | 407 | ret = timer_settime(*timer_id, 0, &its, NULL); |
331744e3 JD |
408 | if (ret == -1) { |
409 | PERROR("timer_settime"); | |
e9404c27 JG |
410 | goto error_destroy_timer; |
411 | } | |
412 | end: | |
413 | return ret; | |
414 | error_destroy_timer: | |
415 | delete_ret = timer_delete(*timer_id); | |
416 | if (delete_ret == -1) { | |
417 | PERROR("timer_delete"); | |
418 | } | |
419 | goto end; | |
420 | } | |
421 | ||
422 | static | |
423 | int consumer_channel_timer_stop(timer_t *timer_id, int signal) | |
424 | { | |
425 | int ret = 0; | |
426 | ||
427 | ret = timer_delete(*timer_id); | |
428 | if (ret == -1) { | |
429 | PERROR("timer_delete"); | |
430 | goto end; | |
331744e3 | 431 | } |
e9404c27 JG |
432 | |
433 | consumer_timer_signal_thread_qs(signal); | |
434 | *timer_id = 0; | |
435 | end: | |
436 | return ret; | |
437 | } | |
438 | ||
439 | /* | |
440 | * Set the channel's switch timer. | |
441 | */ | |
442 | void consumer_timer_switch_start(struct lttng_consumer_channel *channel, | |
443 | unsigned int switch_timer_interval_us) | |
444 | { | |
445 | int ret; | |
446 | ||
447 | assert(channel); | |
448 | assert(channel->key); | |
449 | ||
450 | ret = consumer_channel_timer_start(&channel->switch_timer, channel, | |
451 | switch_timer_interval_us, LTTNG_CONSUMER_SIG_SWITCH); | |
452 | ||
453 | channel->switch_timer_enabled = !!(ret == 0); | |
331744e3 JD |
454 | } |
455 | ||
456 | /* | |
e9404c27 | 457 | * Stop and delete the channel's switch timer. |
331744e3 JD |
458 | */ |
459 | void consumer_timer_switch_stop(struct lttng_consumer_channel *channel) | |
460 | { | |
461 | int ret; | |
331744e3 JD |
462 | |
463 | assert(channel); | |
464 | ||
e9404c27 JG |
465 | ret = consumer_channel_timer_stop(&channel->switch_timer, |
466 | LTTNG_CONSUMER_SIG_SWITCH); | |
331744e3 | 467 | if (ret == -1) { |
e9404c27 | 468 | ERR("Failed to stop switch timer"); |
331744e3 JD |
469 | } |
470 | ||
2b8f8754 | 471 | channel->switch_timer_enabled = 0; |
331744e3 JD |
472 | } |
473 | ||
d3e2ba59 | 474 | /* |
e9404c27 | 475 | * Set the channel's live timer. |
d3e2ba59 JD |
476 | */ |
477 | void consumer_timer_live_start(struct lttng_consumer_channel *channel, | |
e9404c27 | 478 | unsigned int live_timer_interval_us) |
d3e2ba59 JD |
479 | { |
480 | int ret; | |
d3e2ba59 JD |
481 | |
482 | assert(channel); | |
483 | assert(channel->key); | |
484 | ||
e9404c27 JG |
485 | ret = consumer_channel_timer_start(&channel->live_timer, channel, |
486 | live_timer_interval_us, LTTNG_CONSUMER_SIG_LIVE); | |
d3e2ba59 | 487 | |
e9404c27 JG |
488 | channel->live_timer_enabled = !!(ret == 0); |
489 | } | |
d3e2ba59 | 490 | |
e9404c27 JG |
491 | /* |
492 | * Stop and delete the channel's live timer. | |
493 | */ | |
494 | void consumer_timer_live_stop(struct lttng_consumer_channel *channel) | |
495 | { | |
496 | int ret; | |
497 | ||
498 | assert(channel); | |
d3e2ba59 | 499 | |
e9404c27 JG |
500 | ret = consumer_channel_timer_stop(&channel->live_timer, |
501 | LTTNG_CONSUMER_SIG_LIVE); | |
d3e2ba59 | 502 | if (ret == -1) { |
e9404c27 | 503 | ERR("Failed to stop live timer"); |
d3e2ba59 | 504 | } |
e9404c27 JG |
505 | |
506 | channel->live_timer_enabled = 0; | |
d3e2ba59 JD |
507 | } |
508 | ||
509 | /* | |
e9404c27 JG |
510 | * Set the channel's monitoring timer. |
511 | * | |
512 | * Returns a negative value on error, 0 if a timer was created, and | |
513 | * a positive value if no timer was created (not an error). | |
d3e2ba59 | 514 | */ |
e9404c27 JG |
515 | int consumer_timer_monitor_start(struct lttng_consumer_channel *channel, |
516 | unsigned int monitor_timer_interval_us) | |
d3e2ba59 JD |
517 | { |
518 | int ret; | |
519 | ||
520 | assert(channel); | |
e9404c27 JG |
521 | assert(channel->key); |
522 | assert(!channel->monitor_timer_enabled); | |
d3e2ba59 | 523 | |
e9404c27 JG |
524 | ret = consumer_channel_timer_start(&channel->monitor_timer, channel, |
525 | monitor_timer_interval_us, LTTNG_CONSUMER_SIG_MONITOR); | |
526 | channel->monitor_timer_enabled = !!(ret == 0); | |
527 | return ret; | |
528 | } | |
529 | ||
530 | /* | |
531 | * Stop and delete the channel's monitoring timer. | |
532 | */ | |
533 | int consumer_timer_monitor_stop(struct lttng_consumer_channel *channel) | |
534 | { | |
535 | int ret; | |
536 | ||
537 | assert(channel); | |
538 | assert(channel->monitor_timer_enabled); | |
539 | ||
540 | ret = consumer_channel_timer_stop(&channel->monitor_timer, | |
541 | LTTNG_CONSUMER_SIG_MONITOR); | |
d3e2ba59 | 542 | if (ret == -1) { |
e9404c27 JG |
543 | ERR("Failed to stop live timer"); |
544 | goto end; | |
d3e2ba59 JD |
545 | } |
546 | ||
e9404c27 JG |
547 | channel->monitor_timer_enabled = 0; |
548 | end: | |
549 | return ret; | |
d3e2ba59 JD |
550 | } |
551 | ||
331744e3 JD |
552 | /* |
553 | * Block the RT signals for the entire process. It must be called from the | |
554 | * consumer main before creating the threads | |
555 | */ | |
73664f81 | 556 | int consumer_signal_init(void) |
331744e3 JD |
557 | { |
558 | int ret; | |
559 | sigset_t mask; | |
560 | ||
561 | /* Block signal for entire process, so only our thread processes it. */ | |
562 | setmask(&mask); | |
563 | ret = pthread_sigmask(SIG_BLOCK, &mask, NULL); | |
564 | if (ret) { | |
565 | errno = ret; | |
566 | PERROR("pthread_sigmask"); | |
73664f81 | 567 | return -1; |
331744e3 | 568 | } |
73664f81 | 569 | return 0; |
331744e3 JD |
570 | } |
571 | ||
e9404c27 JG |
572 | static |
573 | int sample_channel_positions(struct lttng_consumer_channel *channel, | |
e8360425 | 574 | uint64_t *_highest_use, uint64_t *_lowest_use, uint64_t *_total_consumed, |
e9404c27 JG |
575 | sample_positions_cb sample, get_consumed_cb get_consumed, |
576 | get_produced_cb get_produced) | |
577 | { | |
23bc9bb5 | 578 | int ret = 0; |
e9404c27 JG |
579 | struct lttng_ht_iter iter; |
580 | struct lttng_consumer_stream *stream; | |
581 | bool empty_channel = true; | |
582 | uint64_t high = 0, low = UINT64_MAX; | |
583 | struct lttng_ht *ht = consumer_data.stream_per_chan_id_ht; | |
584 | ||
e8360425 JD |
585 | *_total_consumed = 0; |
586 | ||
e9404c27 JG |
587 | rcu_read_lock(); |
588 | ||
589 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
590 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
591 | ht->match_fct, &channel->key, | |
592 | &iter.iter, stream, node_channel_id.node) { | |
593 | unsigned long produced, consumed, usage; | |
594 | ||
595 | empty_channel = false; | |
596 | ||
597 | pthread_mutex_lock(&stream->lock); | |
598 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
599 | goto next; | |
600 | } | |
601 | ||
602 | ret = sample(stream); | |
603 | if (ret) { | |
604 | ERR("Failed to take buffer position snapshot in monitor timer (ret = %d)", ret); | |
605 | pthread_mutex_unlock(&stream->lock); | |
606 | goto end; | |
607 | } | |
608 | ret = get_consumed(stream, &consumed); | |
609 | if (ret) { | |
610 | ERR("Failed to get buffer consumed position in monitor timer"); | |
611 | pthread_mutex_unlock(&stream->lock); | |
612 | goto end; | |
613 | } | |
614 | ret = get_produced(stream, &produced); | |
615 | if (ret) { | |
616 | ERR("Failed to get buffer produced position in monitor timer"); | |
617 | pthread_mutex_unlock(&stream->lock); | |
618 | goto end; | |
619 | } | |
620 | ||
621 | usage = produced - consumed; | |
622 | high = (usage > high) ? usage : high; | |
623 | low = (usage < low) ? usage : low; | |
e8360425 JD |
624 | |
625 | /* | |
626 | * We don't use consumed here for 2 reasons: | |
627 | * - output_written takes into account the padding written in the | |
628 | * tracefiles when we stop the session; | |
629 | * - the consumed position is not the accurate representation of what | |
630 | * was extracted from a buffer in overwrite mode. | |
631 | */ | |
632 | *_total_consumed += stream->output_written; | |
e9404c27 JG |
633 | next: |
634 | pthread_mutex_unlock(&stream->lock); | |
635 | } | |
636 | ||
637 | *_highest_use = high; | |
638 | *_lowest_use = low; | |
639 | end: | |
640 | rcu_read_unlock(); | |
641 | if (empty_channel) { | |
642 | ret = -1; | |
643 | } | |
644 | return ret; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Execute action on a monitor timer. | |
649 | */ | |
650 | static | |
5704917f | 651 | void monitor_timer(struct lttng_consumer_channel *channel) |
e9404c27 JG |
652 | { |
653 | int ret; | |
654 | int channel_monitor_pipe = | |
655 | consumer_timer_thread_get_channel_monitor_pipe(); | |
656 | struct lttcomm_consumer_channel_monitor_msg msg = { | |
657 | .key = channel->key, | |
658 | }; | |
659 | sample_positions_cb sample; | |
660 | get_consumed_cb get_consumed; | |
661 | get_produced_cb get_produced; | |
e890d98a | 662 | uint64_t lowest = 0, highest = 0, total_consumed = 0; |
e9404c27 JG |
663 | |
664 | assert(channel); | |
e9404c27 JG |
665 | |
666 | if (channel_monitor_pipe < 0) { | |
873dda4e | 667 | return; |
e9404c27 JG |
668 | } |
669 | ||
670 | switch (consumer_data.type) { | |
671 | case LTTNG_CONSUMER_KERNEL: | |
672 | sample = lttng_kconsumer_sample_snapshot_positions; | |
673 | get_consumed = lttng_kconsumer_get_consumed_snapshot; | |
674 | get_produced = lttng_kconsumer_get_produced_snapshot; | |
675 | break; | |
676 | case LTTNG_CONSUMER32_UST: | |
677 | case LTTNG_CONSUMER64_UST: | |
678 | sample = lttng_ustconsumer_sample_snapshot_positions; | |
679 | get_consumed = lttng_ustconsumer_get_consumed_snapshot; | |
680 | get_produced = lttng_ustconsumer_get_produced_snapshot; | |
681 | break; | |
682 | default: | |
683 | abort(); | |
684 | } | |
685 | ||
e890d98a JG |
686 | ret = sample_channel_positions(channel, &highest, &lowest, |
687 | &total_consumed, sample, get_consumed, get_produced); | |
e9404c27 | 688 | if (ret) { |
873dda4e | 689 | return; |
e9404c27 | 690 | } |
e890d98a JG |
691 | msg.highest = highest; |
692 | msg.lowest = lowest; | |
693 | msg.total_consumed = total_consumed; | |
e9404c27 JG |
694 | |
695 | /* | |
696 | * Writes performed here are assumed to be atomic which is only | |
697 | * guaranteed for sizes < than PIPE_BUF. | |
698 | */ | |
699 | assert(sizeof(msg) <= PIPE_BUF); | |
700 | ||
701 | do { | |
702 | ret = write(channel_monitor_pipe, &msg, sizeof(msg)); | |
703 | } while (ret == -1 && errno == EINTR); | |
704 | if (ret == -1) { | |
705 | if (errno == EAGAIN) { | |
706 | /* Not an error, the sample is merely dropped. */ | |
707 | DBG("Channel monitor pipe is full; dropping sample for channel key = %"PRIu64, | |
708 | channel->key); | |
709 | } else { | |
710 | PERROR("write to the channel monitor pipe"); | |
711 | } | |
712 | } else { | |
713 | DBG("Sent channel monitoring sample for channel key %" PRIu64 | |
714 | ", (highest = %" PRIu64 ", lowest = %"PRIu64")", | |
715 | channel->key, msg.highest, msg.lowest); | |
716 | } | |
e9404c27 JG |
717 | } |
718 | ||
719 | int consumer_timer_thread_get_channel_monitor_pipe(void) | |
720 | { | |
721 | return uatomic_read(&channel_monitor_pipe); | |
722 | } | |
723 | ||
724 | int consumer_timer_thread_set_channel_monitor_pipe(int fd) | |
725 | { | |
726 | int ret; | |
727 | ||
728 | ret = uatomic_cmpxchg(&channel_monitor_pipe, -1, fd); | |
729 | if (ret != -1) { | |
730 | ret = -1; | |
731 | goto end; | |
732 | } | |
733 | ret = 0; | |
734 | end: | |
735 | return ret; | |
736 | } | |
737 | ||
331744e3 | 738 | /* |
d3e2ba59 | 739 | * This thread is the sighandler for signals LTTNG_CONSUMER_SIG_SWITCH, |
e9404c27 | 740 | * LTTNG_CONSUMER_SIG_TEARDOWN, LTTNG_CONSUMER_SIG_LIVE, and |
13675d0e | 741 | * LTTNG_CONSUMER_SIG_MONITOR, LTTNG_CONSUMER_SIG_EXIT. |
331744e3 | 742 | */ |
d3e2ba59 | 743 | void *consumer_timer_thread(void *data) |
331744e3 JD |
744 | { |
745 | int signr; | |
746 | sigset_t mask; | |
747 | siginfo_t info; | |
748 | struct lttng_consumer_local_data *ctx = data; | |
749 | ||
8a9acb74 MD |
750 | rcu_register_thread(); |
751 | ||
1fc79fb4 MD |
752 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); |
753 | ||
2d57de81 MD |
754 | if (testpoint(consumerd_thread_metadata_timer)) { |
755 | goto error_testpoint; | |
756 | } | |
757 | ||
9ce5646a MD |
758 | health_code_update(); |
759 | ||
331744e3 JD |
760 | /* Only self thread will receive signal mask. */ |
761 | setmask(&mask); | |
762 | CMM_STORE_SHARED(timer_signal.tid, pthread_self()); | |
763 | ||
764 | while (1) { | |
9ce5646a MD |
765 | health_code_update(); |
766 | ||
767 | health_poll_entry(); | |
331744e3 | 768 | signr = sigwaitinfo(&mask, &info); |
9ce5646a | 769 | health_poll_exit(); |
e9404c27 JG |
770 | |
771 | /* | |
772 | * NOTE: cascading conditions are used instead of a switch case | |
773 | * since the use of SIGRTMIN in the definition of the signals' | |
774 | * values prevents the reduction to an integer constant. | |
775 | */ | |
331744e3 JD |
776 | if (signr == -1) { |
777 | if (errno != EINTR) { | |
778 | PERROR("sigwaitinfo"); | |
779 | } | |
780 | continue; | |
781 | } else if (signr == LTTNG_CONSUMER_SIG_SWITCH) { | |
d7e2822f | 782 | metadata_switch_timer(ctx, &info); |
331744e3 JD |
783 | } else if (signr == LTTNG_CONSUMER_SIG_TEARDOWN) { |
784 | cmm_smp_mb(); | |
785 | CMM_STORE_SHARED(timer_signal.qs_done, 1); | |
786 | cmm_smp_mb(); | |
787 | DBG("Signal timer metadata thread teardown"); | |
d3e2ba59 | 788 | } else if (signr == LTTNG_CONSUMER_SIG_LIVE) { |
d7e2822f | 789 | live_timer(ctx, &info); |
e9404c27 JG |
790 | } else if (signr == LTTNG_CONSUMER_SIG_MONITOR) { |
791 | struct lttng_consumer_channel *channel; | |
792 | ||
793 | channel = info.si_value.sival_ptr; | |
5704917f | 794 | monitor_timer(channel); |
13675d0e MD |
795 | } else if (signr == LTTNG_CONSUMER_SIG_EXIT) { |
796 | assert(CMM_LOAD_SHARED(consumer_quit)); | |
797 | goto end; | |
331744e3 JD |
798 | } else { |
799 | ERR("Unexpected signal %d\n", info.si_signo); | |
800 | } | |
801 | } | |
802 | ||
2d57de81 MD |
803 | error_testpoint: |
804 | /* Only reached in testpoint error */ | |
805 | health_error(); | |
13675d0e | 806 | end: |
1fc79fb4 | 807 | health_unregister(health_consumerd); |
8a9acb74 | 808 | rcu_unregister_thread(); |
331744e3 JD |
809 | return NULL; |
810 | } |