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 | ||
daa81f58 | 24 | #include <lttng/ust-ctl.h> |
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> | |
c8fea79c JR |
30 | #include <common/consumer/consumer-stream.h> |
31 | #include <common/consumer/consumer-timer.h> | |
32 | #include <common/consumer/consumer-testpoint.h> | |
33 | #include <common/ust-consumer/ust-consumer.h> | |
331744e3 | 34 | |
2b8f8754 MD |
35 | static struct timer_signal_data timer_signal = { |
36 | .tid = 0, | |
37 | .setup_done = 0, | |
38 | .qs_done = 0, | |
39 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
40 | }; | |
331744e3 JD |
41 | |
42 | /* | |
43 | * Set custom signal mask to current thread. | |
44 | */ | |
45 | static void setmask(sigset_t *mask) | |
46 | { | |
47 | int ret; | |
48 | ||
49 | ret = sigemptyset(mask); | |
50 | if (ret) { | |
51 | PERROR("sigemptyset"); | |
52 | } | |
53 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_SWITCH); | |
54 | if (ret) { | |
d3e2ba59 | 55 | PERROR("sigaddset switch"); |
331744e3 JD |
56 | } |
57 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_TEARDOWN); | |
58 | if (ret) { | |
d3e2ba59 JD |
59 | PERROR("sigaddset teardown"); |
60 | } | |
61 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_LIVE); | |
62 | if (ret) { | |
63 | PERROR("sigaddset live"); | |
331744e3 | 64 | } |
daa81f58 JG |
65 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_MONITOR); |
66 | if (ret) { | |
67 | PERROR("sigaddset monitor"); | |
68 | } | |
331744e3 JD |
69 | } |
70 | ||
daa81f58 JG |
71 | static int channel_monitor_pipe = -1; |
72 | ||
331744e3 JD |
73 | /* |
74 | * Execute action on a timer switch. | |
d98a47c7 MD |
75 | * |
76 | * Beware: metadata_switch_timer() should *never* take a mutex also held | |
77 | * while consumer_timer_switch_stop() is called. It would result in | |
78 | * deadlocks. | |
331744e3 JD |
79 | */ |
80 | static void metadata_switch_timer(struct lttng_consumer_local_data *ctx, | |
daa81f58 | 81 | int sig, siginfo_t *si) |
331744e3 JD |
82 | { |
83 | int ret; | |
84 | struct lttng_consumer_channel *channel; | |
85 | ||
86 | channel = si->si_value.sival_ptr; | |
87 | assert(channel); | |
88 | ||
4419b4fb MD |
89 | if (channel->switch_timer_error) { |
90 | return; | |
91 | } | |
92 | ||
331744e3 JD |
93 | DBG("Switch timer for channel %" PRIu64, channel->key); |
94 | switch (ctx->type) { | |
95 | case LTTNG_CONSUMER32_UST: | |
96 | case LTTNG_CONSUMER64_UST: | |
4fa3dc0e MD |
97 | /* |
98 | * Locks taken by lttng_ustconsumer_request_metadata(): | |
99 | * - metadata_socket_lock | |
100 | * - Calling lttng_ustconsumer_recv_metadata(): | |
f82d9449 | 101 | * - channel->metadata_cache->lock |
4fa3dc0e | 102 | * - Calling consumer_metadata_cache_flushed(): |
5e41ebe1 MD |
103 | * - channel->timer_lock |
104 | * - channel->metadata_cache->lock | |
4fa3dc0e | 105 | * |
5e41ebe1 MD |
106 | * Ensure that neither consumer_data.lock nor |
107 | * channel->lock are taken within this function, since | |
108 | * they are held while consumer_timer_switch_stop() is | |
109 | * called. | |
4fa3dc0e | 110 | */ |
94d49140 | 111 | ret = lttng_ustconsumer_request_metadata(ctx, channel, 1, 1); |
331744e3 | 112 | if (ret < 0) { |
4419b4fb | 113 | channel->switch_timer_error = 1; |
331744e3 JD |
114 | } |
115 | break; | |
116 | case LTTNG_CONSUMER_KERNEL: | |
117 | case LTTNG_CONSUMER_UNKNOWN: | |
118 | assert(0); | |
119 | break; | |
120 | } | |
121 | } | |
122 | ||
528f2ffa JD |
123 | static int send_empty_index(struct lttng_consumer_stream *stream, uint64_t ts, |
124 | uint64_t stream_id) | |
d3e2ba59 JD |
125 | { |
126 | int ret; | |
50adc264 | 127 | struct ctf_packet_index index; |
d3e2ba59 JD |
128 | |
129 | memset(&index, 0, sizeof(index)); | |
528f2ffa | 130 | index.stream_id = htobe64(stream_id); |
d3e2ba59 JD |
131 | index.timestamp_end = htobe64(ts); |
132 | ret = consumer_stream_write_index(stream, &index); | |
133 | if (ret < 0) { | |
134 | goto error; | |
135 | } | |
136 | ||
137 | error: | |
138 | return ret; | |
139 | } | |
140 | ||
c585821b | 141 | int consumer_flush_kernel_index(struct lttng_consumer_stream *stream) |
d3e2ba59 | 142 | { |
528f2ffa | 143 | uint64_t ts, stream_id; |
d3e2ba59 JD |
144 | int ret; |
145 | ||
d3e2ba59 JD |
146 | ret = kernctl_get_current_timestamp(stream->wait_fd, &ts); |
147 | if (ret < 0) { | |
148 | ERR("Failed to get the current timestamp"); | |
c585821b | 149 | goto end; |
d3e2ba59 JD |
150 | } |
151 | ret = kernctl_buffer_flush(stream->wait_fd); | |
152 | if (ret < 0) { | |
153 | ERR("Failed to flush kernel stream"); | |
c585821b | 154 | goto end; |
d3e2ba59 JD |
155 | } |
156 | ret = kernctl_snapshot(stream->wait_fd); | |
157 | if (ret < 0) { | |
32af2c95 | 158 | if (ret != -EAGAIN && ret != -ENODATA) { |
08b1dcd3 | 159 | PERROR("live timer kernel snapshot"); |
d3e2ba59 | 160 | ret = -1; |
c585821b | 161 | goto end; |
d3e2ba59 | 162 | } |
528f2ffa JD |
163 | ret = kernctl_get_stream_id(stream->wait_fd, &stream_id); |
164 | if (ret < 0) { | |
165 | PERROR("kernctl_get_stream_id"); | |
c585821b | 166 | goto end; |
528f2ffa | 167 | } |
d3e2ba59 | 168 | DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); |
528f2ffa | 169 | ret = send_empty_index(stream, ts, stream_id); |
d3e2ba59 | 170 | if (ret < 0) { |
c585821b | 171 | goto end; |
d3e2ba59 JD |
172 | } |
173 | } | |
174 | ret = 0; | |
c585821b | 175 | end: |
d3e2ba59 JD |
176 | return ret; |
177 | } | |
178 | ||
c585821b | 179 | static int check_kernel_stream(struct lttng_consumer_stream *stream) |
d3e2ba59 | 180 | { |
d3e2ba59 JD |
181 | int ret; |
182 | ||
d3e2ba59 JD |
183 | /* |
184 | * While holding the stream mutex, try to take a snapshot, if it | |
185 | * succeeds, it means that data is ready to be sent, just let the data | |
186 | * thread handle that. Otherwise, if the snapshot returns EAGAIN, it | |
187 | * means that there is no data to read after the flush, so we can | |
188 | * safely send the empty index. | |
c585821b MD |
189 | * |
190 | * Doing a trylock and checking if waiting on metadata if | |
191 | * trylock fails. Bail out of the stream is indeed waiting for | |
192 | * metadata to be pushed. Busy wait on trylock otherwise. | |
d3e2ba59 | 193 | */ |
c585821b MD |
194 | for (;;) { |
195 | ret = pthread_mutex_trylock(&stream->lock); | |
196 | switch (ret) { | |
197 | case 0: | |
198 | break; /* We have the lock. */ | |
199 | case EBUSY: | |
200 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
201 | if (stream->waiting_on_metadata) { | |
202 | ret = 0; | |
203 | stream->missed_metadata_flush = true; | |
204 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
205 | goto end; /* Bail out. */ | |
206 | } | |
207 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
208 | /* Try again. */ | |
209 | caa_cpu_relax(); | |
210 | continue; | |
211 | default: | |
212 | ERR("Unexpected pthread_mutex_trylock error %d", ret); | |
213 | ret = -1; | |
214 | goto end; | |
215 | } | |
216 | break; | |
217 | } | |
218 | ret = consumer_flush_kernel_index(stream); | |
219 | pthread_mutex_unlock(&stream->lock); | |
220 | end: | |
221 | return ret; | |
222 | } | |
223 | ||
224 | int consumer_flush_ust_index(struct lttng_consumer_stream *stream) | |
225 | { | |
226 | uint64_t ts, stream_id; | |
227 | int ret; | |
228 | ||
94d49140 JD |
229 | ret = cds_lfht_is_node_deleted(&stream->node.node); |
230 | if (ret) { | |
c585821b | 231 | goto end; |
94d49140 JD |
232 | } |
233 | ||
84a182ce | 234 | ret = lttng_ustconsumer_get_current_timestamp(stream, &ts); |
d3e2ba59 JD |
235 | if (ret < 0) { |
236 | ERR("Failed to get the current timestamp"); | |
c585821b | 237 | goto end; |
d3e2ba59 | 238 | } |
84a182ce DG |
239 | lttng_ustconsumer_flush_buffer(stream, 1); |
240 | ret = lttng_ustconsumer_take_snapshot(stream); | |
d3e2ba59 | 241 | if (ret < 0) { |
94d49140 | 242 | if (ret != -EAGAIN) { |
d3e2ba59 JD |
243 | ERR("Taking UST snapshot"); |
244 | ret = -1; | |
c585821b | 245 | goto end; |
d3e2ba59 | 246 | } |
70190e1c | 247 | ret = lttng_ustconsumer_get_stream_id(stream, &stream_id); |
528f2ffa JD |
248 | if (ret < 0) { |
249 | PERROR("ustctl_get_stream_id"); | |
c585821b | 250 | goto end; |
528f2ffa | 251 | } |
d3e2ba59 | 252 | DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); |
528f2ffa | 253 | ret = send_empty_index(stream, ts, stream_id); |
d3e2ba59 | 254 | if (ret < 0) { |
c585821b | 255 | goto end; |
d3e2ba59 JD |
256 | } |
257 | } | |
258 | ret = 0; | |
c585821b MD |
259 | end: |
260 | return ret; | |
261 | } | |
d3e2ba59 | 262 | |
c585821b MD |
263 | static int check_ust_stream(struct lttng_consumer_stream *stream) |
264 | { | |
265 | int ret; | |
266 | ||
267 | assert(stream); | |
268 | assert(stream->ustream); | |
269 | /* | |
270 | * While holding the stream mutex, try to take a snapshot, if it | |
271 | * succeeds, it means that data is ready to be sent, just let the data | |
272 | * thread handle that. Otherwise, if the snapshot returns EAGAIN, it | |
273 | * means that there is no data to read after the flush, so we can | |
274 | * safely send the empty index. | |
275 | * | |
276 | * Doing a trylock and checking if waiting on metadata if | |
277 | * trylock fails. Bail out of the stream is indeed waiting for | |
278 | * metadata to be pushed. Busy wait on trylock otherwise. | |
279 | */ | |
280 | for (;;) { | |
281 | ret = pthread_mutex_trylock(&stream->lock); | |
282 | switch (ret) { | |
283 | case 0: | |
284 | break; /* We have the lock. */ | |
285 | case EBUSY: | |
286 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
287 | if (stream->waiting_on_metadata) { | |
288 | ret = 0; | |
289 | stream->missed_metadata_flush = true; | |
290 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
291 | goto end; /* Bail out. */ | |
292 | } | |
293 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
294 | /* Try again. */ | |
295 | caa_cpu_relax(); | |
296 | continue; | |
297 | default: | |
298 | ERR("Unexpected pthread_mutex_trylock error %d", ret); | |
299 | ret = -1; | |
300 | goto end; | |
301 | } | |
302 | break; | |
303 | } | |
304 | ret = consumer_flush_ust_index(stream); | |
d3e2ba59 | 305 | pthread_mutex_unlock(&stream->lock); |
c585821b | 306 | end: |
d3e2ba59 JD |
307 | return ret; |
308 | } | |
309 | ||
310 | /* | |
311 | * Execute action on a live timer | |
312 | */ | |
313 | static void live_timer(struct lttng_consumer_local_data *ctx, | |
daa81f58 | 314 | int sig, siginfo_t *si) |
d3e2ba59 JD |
315 | { |
316 | int ret; | |
317 | struct lttng_consumer_channel *channel; | |
318 | struct lttng_consumer_stream *stream; | |
319 | struct lttng_ht *ht; | |
320 | struct lttng_ht_iter iter; | |
321 | ||
322 | channel = si->si_value.sival_ptr; | |
323 | assert(channel); | |
324 | ||
325 | if (channel->switch_timer_error) { | |
326 | goto error; | |
327 | } | |
328 | ht = consumer_data.stream_per_chan_id_ht; | |
329 | ||
330 | DBG("Live timer for channel %" PRIu64, channel->key); | |
331 | ||
332 | rcu_read_lock(); | |
333 | switch (ctx->type) { | |
334 | case LTTNG_CONSUMER32_UST: | |
335 | case LTTNG_CONSUMER64_UST: | |
336 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
337 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
338 | ht->match_fct, &channel->key, &iter.iter, | |
339 | stream, node_channel_id.node) { | |
340 | ret = check_ust_stream(stream); | |
341 | if (ret < 0) { | |
342 | goto error_unlock; | |
343 | } | |
344 | } | |
345 | break; | |
346 | case LTTNG_CONSUMER_KERNEL: | |
347 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
348 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
349 | ht->match_fct, &channel->key, &iter.iter, | |
350 | stream, node_channel_id.node) { | |
351 | ret = check_kernel_stream(stream); | |
352 | if (ret < 0) { | |
353 | goto error_unlock; | |
354 | } | |
355 | } | |
356 | break; | |
357 | case LTTNG_CONSUMER_UNKNOWN: | |
358 | assert(0); | |
359 | break; | |
360 | } | |
361 | ||
362 | error_unlock: | |
363 | rcu_read_unlock(); | |
364 | ||
365 | error: | |
366 | return; | |
367 | } | |
368 | ||
2b8f8754 MD |
369 | static |
370 | void consumer_timer_signal_thread_qs(unsigned int signr) | |
371 | { | |
372 | sigset_t pending_set; | |
373 | int ret; | |
374 | ||
375 | /* | |
376 | * We need to be the only thread interacting with the thread | |
377 | * that manages signals for teardown synchronization. | |
378 | */ | |
379 | pthread_mutex_lock(&timer_signal.lock); | |
380 | ||
381 | /* Ensure we don't have any signal queued for this channel. */ | |
382 | for (;;) { | |
383 | ret = sigemptyset(&pending_set); | |
384 | if (ret == -1) { | |
385 | PERROR("sigemptyset"); | |
386 | } | |
387 | ret = sigpending(&pending_set); | |
388 | if (ret == -1) { | |
389 | PERROR("sigpending"); | |
390 | } | |
391 | if (!sigismember(&pending_set, LTTNG_CONSUMER_SIG_SWITCH)) { | |
392 | break; | |
393 | } | |
394 | caa_cpu_relax(); | |
395 | } | |
396 | ||
397 | /* | |
398 | * From this point, no new signal handler will be fired that would try to | |
399 | * access "chan". However, we still need to wait for any currently | |
400 | * executing handler to complete. | |
401 | */ | |
402 | cmm_smp_mb(); | |
403 | CMM_STORE_SHARED(timer_signal.qs_done, 0); | |
404 | cmm_smp_mb(); | |
405 | ||
406 | /* | |
407 | * Kill with LTTNG_CONSUMER_SIG_TEARDOWN, so signal management thread wakes | |
408 | * up. | |
409 | */ | |
410 | kill(getpid(), LTTNG_CONSUMER_SIG_TEARDOWN); | |
411 | ||
412 | while (!CMM_LOAD_SHARED(timer_signal.qs_done)) { | |
413 | caa_cpu_relax(); | |
414 | } | |
415 | cmm_smp_mb(); | |
416 | ||
417 | pthread_mutex_unlock(&timer_signal.lock); | |
418 | } | |
419 | ||
331744e3 | 420 | /* |
daa81f58 JG |
421 | * Start a timer channel timer which will fire at a given interval |
422 | * (timer_interval_us)and fire a given signal (signal). | |
423 | * | |
424 | * Returns a negative value on error, 0 if a timer was created, and | |
425 | * a positive value if no timer was created (not an error). | |
331744e3 | 426 | */ |
daa81f58 JG |
427 | static |
428 | int consumer_channel_timer_start(timer_t *timer_id, | |
429 | struct lttng_consumer_channel *channel, | |
430 | unsigned int timer_interval_us, int signal) | |
331744e3 | 431 | { |
daa81f58 | 432 | int ret = 0, delete_ret; |
331744e3 JD |
433 | struct sigevent sev; |
434 | struct itimerspec its; | |
435 | ||
436 | assert(channel); | |
437 | assert(channel->key); | |
438 | ||
daa81f58 JG |
439 | if (timer_interval_us == 0) { |
440 | /* No creation needed; not an error. */ | |
441 | ret = 1; | |
442 | goto end; | |
331744e3 JD |
443 | } |
444 | ||
445 | sev.sigev_notify = SIGEV_SIGNAL; | |
daa81f58 | 446 | sev.sigev_signo = signal; |
331744e3 | 447 | sev.sigev_value.sival_ptr = channel; |
daa81f58 | 448 | ret = timer_create(CLOCKID, &sev, timer_id); |
331744e3 JD |
449 | if (ret == -1) { |
450 | PERROR("timer_create"); | |
daa81f58 | 451 | goto end; |
331744e3 | 452 | } |
331744e3 | 453 | |
daa81f58 JG |
454 | its.it_value.tv_sec = timer_interval_us / 1000000; |
455 | its.it_value.tv_nsec = (timer_interval_us % 1000000) * 1000; | |
331744e3 JD |
456 | its.it_interval.tv_sec = its.it_value.tv_sec; |
457 | its.it_interval.tv_nsec = its.it_value.tv_nsec; | |
458 | ||
daa81f58 | 459 | ret = timer_settime(*timer_id, 0, &its, NULL); |
331744e3 JD |
460 | if (ret == -1) { |
461 | PERROR("timer_settime"); | |
daa81f58 JG |
462 | goto error_destroy_timer; |
463 | } | |
464 | end: | |
465 | return ret; | |
466 | error_destroy_timer: | |
467 | delete_ret = timer_delete(*timer_id); | |
468 | if (delete_ret == -1) { | |
469 | PERROR("timer_delete"); | |
470 | } | |
471 | goto end; | |
472 | } | |
473 | ||
474 | static | |
475 | int consumer_channel_timer_stop(timer_t *timer_id, int signal) | |
476 | { | |
477 | int ret = 0; | |
478 | ||
479 | ret = timer_delete(*timer_id); | |
480 | if (ret == -1) { | |
481 | PERROR("timer_delete"); | |
482 | goto end; | |
331744e3 | 483 | } |
daa81f58 JG |
484 | |
485 | consumer_timer_signal_thread_qs(signal); | |
486 | *timer_id = 0; | |
487 | end: | |
488 | return ret; | |
489 | } | |
490 | ||
491 | /* | |
492 | * Set the channel's switch timer. | |
493 | */ | |
494 | void consumer_timer_switch_start(struct lttng_consumer_channel *channel, | |
495 | unsigned int switch_timer_interval_us) | |
496 | { | |
497 | int ret; | |
498 | ||
499 | assert(channel); | |
500 | assert(channel->key); | |
501 | ||
502 | ret = consumer_channel_timer_start(&channel->switch_timer, channel, | |
503 | switch_timer_interval_us, LTTNG_CONSUMER_SIG_SWITCH); | |
504 | ||
505 | channel->switch_timer_enabled = !!(ret == 0); | |
331744e3 JD |
506 | } |
507 | ||
508 | /* | |
daa81f58 | 509 | * Stop and delete the channel's switch timer. |
331744e3 JD |
510 | */ |
511 | void consumer_timer_switch_stop(struct lttng_consumer_channel *channel) | |
512 | { | |
513 | int ret; | |
331744e3 JD |
514 | |
515 | assert(channel); | |
516 | ||
daa81f58 JG |
517 | ret = consumer_channel_timer_stop(&channel->switch_timer, |
518 | LTTNG_CONSUMER_SIG_SWITCH); | |
331744e3 | 519 | if (ret == -1) { |
daa81f58 | 520 | ERR("Failed to stop switch timer"); |
331744e3 JD |
521 | } |
522 | ||
2b8f8754 | 523 | channel->switch_timer_enabled = 0; |
331744e3 JD |
524 | } |
525 | ||
d3e2ba59 | 526 | /* |
daa81f58 | 527 | * Set the channel's live timer. |
d3e2ba59 JD |
528 | */ |
529 | void consumer_timer_live_start(struct lttng_consumer_channel *channel, | |
daa81f58 | 530 | unsigned int live_timer_interval_us) |
d3e2ba59 JD |
531 | { |
532 | int ret; | |
d3e2ba59 JD |
533 | |
534 | assert(channel); | |
535 | assert(channel->key); | |
536 | ||
daa81f58 JG |
537 | ret = consumer_channel_timer_start(&channel->live_timer, channel, |
538 | live_timer_interval_us, LTTNG_CONSUMER_SIG_LIVE); | |
d3e2ba59 | 539 | |
daa81f58 JG |
540 | channel->live_timer_enabled = !!(ret == 0); |
541 | } | |
d3e2ba59 | 542 | |
daa81f58 JG |
543 | /* |
544 | * Stop and delete the channel's live timer. | |
545 | */ | |
546 | void consumer_timer_live_stop(struct lttng_consumer_channel *channel) | |
547 | { | |
548 | int ret; | |
d3e2ba59 | 549 | |
daa81f58 JG |
550 | assert(channel); |
551 | ||
552 | ret = consumer_channel_timer_stop(&channel->live_timer, | |
553 | LTTNG_CONSUMER_SIG_LIVE); | |
d3e2ba59 | 554 | if (ret == -1) { |
daa81f58 | 555 | ERR("Failed to stop live timer"); |
d3e2ba59 | 556 | } |
daa81f58 JG |
557 | |
558 | channel->live_timer_enabled = 0; | |
d3e2ba59 JD |
559 | } |
560 | ||
561 | /* | |
daa81f58 JG |
562 | * Set the channel's monitoring timer. |
563 | * | |
564 | * Returns a negative value on error, 0 if a timer was created, and | |
565 | * a positive value if no timer was created (not an error). | |
d3e2ba59 | 566 | */ |
daa81f58 JG |
567 | int consumer_timer_monitor_start(struct lttng_consumer_channel *channel, |
568 | unsigned int monitor_timer_interval_us) | |
d3e2ba59 JD |
569 | { |
570 | int ret; | |
571 | ||
572 | assert(channel); | |
daa81f58 JG |
573 | assert(channel->key); |
574 | assert(!channel->monitor_timer_enabled); | |
d3e2ba59 | 575 | |
daa81f58 JG |
576 | ret = consumer_channel_timer_start(&channel->monitor_timer, channel, |
577 | monitor_timer_interval_us, LTTNG_CONSUMER_SIG_MONITOR); | |
578 | channel->monitor_timer_enabled = !!(ret == 0); | |
579 | return ret; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Stop and delete the channel's monitoring timer. | |
584 | */ | |
585 | int consumer_timer_monitor_stop(struct lttng_consumer_channel *channel) | |
586 | { | |
587 | int ret; | |
588 | ||
589 | assert(channel); | |
590 | assert(channel->monitor_timer_enabled); | |
591 | ||
592 | ret = consumer_channel_timer_stop(&channel->monitor_timer, | |
593 | LTTNG_CONSUMER_SIG_MONITOR); | |
d3e2ba59 | 594 | if (ret == -1) { |
daa81f58 JG |
595 | ERR("Failed to stop live timer"); |
596 | goto end; | |
d3e2ba59 JD |
597 | } |
598 | ||
daa81f58 JG |
599 | channel->monitor_timer_enabled = 0; |
600 | end: | |
601 | return ret; | |
d3e2ba59 JD |
602 | } |
603 | ||
331744e3 JD |
604 | /* |
605 | * Block the RT signals for the entire process. It must be called from the | |
606 | * consumer main before creating the threads | |
607 | */ | |
73664f81 | 608 | int consumer_signal_init(void) |
331744e3 JD |
609 | { |
610 | int ret; | |
611 | sigset_t mask; | |
612 | ||
613 | /* Block signal for entire process, so only our thread processes it. */ | |
614 | setmask(&mask); | |
615 | ret = pthread_sigmask(SIG_BLOCK, &mask, NULL); | |
616 | if (ret) { | |
617 | errno = ret; | |
618 | PERROR("pthread_sigmask"); | |
73664f81 | 619 | return -1; |
331744e3 | 620 | } |
73664f81 | 621 | return 0; |
331744e3 JD |
622 | } |
623 | ||
daa81f58 JG |
624 | static |
625 | int sample_ust_positions(struct lttng_consumer_channel *channel, | |
626 | uint64_t *_highest_use, uint64_t *_lowest_use) | |
627 | { | |
628 | int ret; | |
629 | struct lttng_ht_iter iter; | |
630 | struct lttng_consumer_stream *stream; | |
631 | bool empty_channel = true; | |
632 | uint64_t high = 0, low = UINT64_MAX; | |
633 | struct lttng_ht *ht = consumer_data.stream_per_chan_id_ht; | |
634 | ||
635 | rcu_read_lock(); | |
636 | ||
637 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
638 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
639 | ht->match_fct, &channel->key, | |
640 | &iter.iter, stream, node_channel_id.node) { | |
641 | unsigned long produced, consumed, usage; | |
642 | ||
643 | empty_channel = false; | |
644 | ||
645 | pthread_mutex_lock(&stream->lock); | |
646 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
647 | goto next; | |
648 | } | |
649 | ||
650 | ret = ustctl_snapshot_sample_positions(stream->ustream); | |
651 | if (ret) { | |
652 | ERR("Failed to take buffer position snapshot in monitor timer (ret = %d)", ret); | |
653 | pthread_mutex_unlock(&stream->lock); | |
654 | goto end; | |
655 | } | |
656 | ret = ustctl_snapshot_get_consumed(stream->ustream, | |
657 | &consumed); | |
658 | if (ret) { | |
659 | ERR("Failed to get buffer consumed position in monitor timer"); | |
660 | pthread_mutex_unlock(&stream->lock); | |
661 | goto end; | |
662 | } | |
663 | ret = ustctl_snapshot_get_produced(stream->ustream, | |
664 | &produced); | |
665 | if (ret) { | |
666 | ERR("Failed to get buffer produced position in monitor timer"); | |
667 | pthread_mutex_unlock(&stream->lock); | |
668 | goto end; | |
669 | } | |
670 | ||
671 | usage = produced - consumed; | |
672 | high = (usage > high) ? usage : high; | |
673 | low = (usage < low) ? usage : low; | |
674 | next: | |
675 | pthread_mutex_unlock(&stream->lock); | |
676 | } | |
677 | ||
678 | *_highest_use = high; | |
679 | *_lowest_use = low; | |
680 | end: | |
681 | rcu_read_unlock(); | |
682 | if (empty_channel) { | |
683 | ret = -1; | |
684 | } | |
685 | return ret; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Execute action on a monitor timer. | |
690 | */ | |
691 | static | |
692 | void monitor_timer(struct lttng_consumer_local_data *ctx, | |
693 | struct lttng_consumer_channel *channel) | |
694 | { | |
695 | int ret; | |
696 | int channel_monitor_pipe = | |
697 | consumer_timer_thread_get_channel_monitor_pipe(); | |
698 | struct lttcomm_consumer_channel_monitor_msg msg = { | |
699 | .key = channel->key, | |
700 | }; | |
701 | ||
702 | assert(channel); | |
703 | pthread_mutex_lock(&consumer_data.lock); | |
704 | ||
705 | if (channel_monitor_pipe < 0) { | |
706 | goto end; | |
707 | } | |
708 | ||
709 | switch (consumer_data.type) { | |
710 | case LTTNG_CONSUMER_KERNEL: | |
711 | /* TODO */ | |
712 | ret = -1; | |
713 | break; | |
714 | case LTTNG_CONSUMER32_UST: | |
715 | case LTTNG_CONSUMER64_UST: | |
716 | { | |
717 | ret = sample_ust_positions(channel, &msg.highest, &msg.lowest); | |
718 | break; | |
719 | } | |
720 | default: | |
721 | abort(); | |
722 | } | |
723 | ||
724 | if (ret) { | |
725 | goto end; | |
726 | } | |
727 | ||
728 | /* | |
729 | * Writes performed here are assumed to be atomic which is only | |
730 | * guaranteed for sizes < than PIPE_BUF. | |
731 | */ | |
732 | assert(sizeof(msg) <= PIPE_BUF); | |
733 | ||
734 | do { | |
735 | ret = write(channel_monitor_pipe, &msg, sizeof(msg)); | |
736 | } while (ret == -1 && errno == EINTR); | |
737 | if (ret == -1) { | |
738 | if (errno == EAGAIN) { | |
739 | /* Not an error, the sample is merely dropped. */ | |
740 | DBG("Channel monitor pipe is full; dropping sample for channel key = %"PRIu64, | |
741 | channel->key); | |
742 | } else { | |
743 | PERROR("write to the channel monitor pipe"); | |
744 | } | |
745 | } else { | |
746 | DBG("Sent channel monitoring sample for channel key %" PRIu64 | |
747 | ", (highest = %" PRIu64 ", lowest = %"PRIu64")", | |
748 | channel->key, msg.highest, msg.lowest); | |
749 | } | |
750 | end: | |
751 | pthread_mutex_unlock(&consumer_data.lock); | |
752 | } | |
753 | ||
754 | int consumer_timer_thread_get_channel_monitor_pipe(void) | |
755 | { | |
756 | return uatomic_read(&channel_monitor_pipe); | |
757 | } | |
758 | ||
759 | int consumer_timer_thread_set_channel_monitor_pipe(int fd) | |
760 | { | |
761 | int ret; | |
762 | ||
763 | ret = uatomic_cmpxchg(&channel_monitor_pipe, -1, fd); | |
764 | if (ret != -1) { | |
765 | ret = -1; | |
766 | goto end; | |
767 | } | |
768 | ret = 0; | |
769 | end: | |
770 | return ret; | |
771 | } | |
772 | ||
331744e3 | 773 | /* |
d3e2ba59 | 774 | * This thread is the sighandler for signals LTTNG_CONSUMER_SIG_SWITCH, |
daa81f58 JG |
775 | * LTTNG_CONSUMER_SIG_TEARDOWN, LTTNG_CONSUMER_SIG_LIVE, and |
776 | * LTTNG_CONSUMER_SIG_MONITOR. | |
331744e3 | 777 | */ |
d3e2ba59 | 778 | void *consumer_timer_thread(void *data) |
331744e3 JD |
779 | { |
780 | int signr; | |
781 | sigset_t mask; | |
782 | siginfo_t info; | |
783 | struct lttng_consumer_local_data *ctx = data; | |
784 | ||
8a9acb74 MD |
785 | rcu_register_thread(); |
786 | ||
1fc79fb4 MD |
787 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); |
788 | ||
2d57de81 MD |
789 | if (testpoint(consumerd_thread_metadata_timer)) { |
790 | goto error_testpoint; | |
791 | } | |
792 | ||
9ce5646a MD |
793 | health_code_update(); |
794 | ||
331744e3 JD |
795 | /* Only self thread will receive signal mask. */ |
796 | setmask(&mask); | |
797 | CMM_STORE_SHARED(timer_signal.tid, pthread_self()); | |
798 | ||
799 | while (1) { | |
9ce5646a MD |
800 | health_code_update(); |
801 | ||
802 | health_poll_entry(); | |
331744e3 | 803 | signr = sigwaitinfo(&mask, &info); |
9ce5646a | 804 | health_poll_exit(); |
daa81f58 JG |
805 | |
806 | /* | |
807 | * NOTE: cascading conditions are used instead of a switch case | |
808 | * since the use of SIGRTMIN in the definition of the signals' | |
809 | * values prevents the reduction to an integer constant. | |
810 | */ | |
331744e3 JD |
811 | if (signr == -1) { |
812 | if (errno != EINTR) { | |
813 | PERROR("sigwaitinfo"); | |
814 | } | |
815 | continue; | |
816 | } else if (signr == LTTNG_CONSUMER_SIG_SWITCH) { | |
daa81f58 | 817 | metadata_switch_timer(ctx, info.si_signo, &info); |
331744e3 JD |
818 | } else if (signr == LTTNG_CONSUMER_SIG_TEARDOWN) { |
819 | cmm_smp_mb(); | |
820 | CMM_STORE_SHARED(timer_signal.qs_done, 1); | |
821 | cmm_smp_mb(); | |
822 | DBG("Signal timer metadata thread teardown"); | |
d3e2ba59 | 823 | } else if (signr == LTTNG_CONSUMER_SIG_LIVE) { |
daa81f58 JG |
824 | live_timer(ctx, info.si_signo, &info); |
825 | } else if (signr == LTTNG_CONSUMER_SIG_MONITOR) { | |
826 | struct lttng_consumer_channel *channel; | |
827 | ||
828 | channel = info.si_value.sival_ptr; | |
829 | monitor_timer(ctx, channel); | |
331744e3 JD |
830 | } else { |
831 | ERR("Unexpected signal %d\n", info.si_signo); | |
832 | } | |
833 | } | |
834 | ||
2d57de81 MD |
835 | error_testpoint: |
836 | /* Only reached in testpoint error */ | |
837 | health_error(); | |
1fc79fb4 MD |
838 | health_unregister(health_consumerd); |
839 | ||
8a9acb74 MD |
840 | rcu_unregister_thread(); |
841 | ||
1fc79fb4 | 842 | /* Never return */ |
331744e3 JD |
843 | return NULL; |
844 | } |