Commit | Line | Data |
---|---|---|
331744e3 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2012 Julien Desfossez <julien.desfossez@efficios.com> |
3 | * Copyright (C) 2012 David Goulet <dgoulet@efficios.com> | |
331744e3 | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
331744e3 | 6 | * |
331744e3 JD |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
331744e3 JD |
10 | #include <assert.h> |
11 | #include <inttypes.h> | |
12 | #include <signal.h> | |
13 | ||
51a9e1c7 | 14 | #include <bin/lttng-consumerd/health-consumerd.h> |
331744e3 | 15 | #include <common/common.h> |
f263b7fd | 16 | #include <common/compat/endian.h> |
d3e2ba59 JD |
17 | #include <common/kernel-ctl/kernel-ctl.h> |
18 | #include <common/kernel-consumer/kernel-consumer.h> | |
c8fea79c JR |
19 | #include <common/consumer/consumer-stream.h> |
20 | #include <common/consumer/consumer-timer.h> | |
21 | #include <common/consumer/consumer-testpoint.h> | |
22 | #include <common/ust-consumer/ust-consumer.h> | |
331744e3 | 23 | |
e9404c27 JG |
24 | typedef int (*sample_positions_cb)(struct lttng_consumer_stream *stream); |
25 | typedef int (*get_consumed_cb)(struct lttng_consumer_stream *stream, | |
26 | unsigned long *consumed); | |
27 | typedef int (*get_produced_cb)(struct lttng_consumer_stream *stream, | |
28 | unsigned long *produced); | |
fad4b619 | 29 | typedef int (*flush_index_cb)(struct lttng_consumer_stream *stream); |
e9404c27 | 30 | |
2b8f8754 MD |
31 | static struct timer_signal_data timer_signal = { |
32 | .tid = 0, | |
33 | .setup_done = 0, | |
34 | .qs_done = 0, | |
35 | .lock = PTHREAD_MUTEX_INITIALIZER, | |
36 | }; | |
331744e3 JD |
37 | |
38 | /* | |
39 | * Set custom signal mask to current thread. | |
40 | */ | |
41 | static void setmask(sigset_t *mask) | |
42 | { | |
43 | int ret; | |
44 | ||
45 | ret = sigemptyset(mask); | |
46 | if (ret) { | |
47 | PERROR("sigemptyset"); | |
48 | } | |
49 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_SWITCH); | |
50 | if (ret) { | |
d3e2ba59 | 51 | PERROR("sigaddset switch"); |
331744e3 JD |
52 | } |
53 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_TEARDOWN); | |
54 | if (ret) { | |
d3e2ba59 JD |
55 | PERROR("sigaddset teardown"); |
56 | } | |
57 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_LIVE); | |
58 | if (ret) { | |
59 | PERROR("sigaddset live"); | |
331744e3 | 60 | } |
e9404c27 JG |
61 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_MONITOR); |
62 | if (ret) { | |
63 | PERROR("sigaddset monitor"); | |
64 | } | |
13675d0e MD |
65 | ret = sigaddset(mask, LTTNG_CONSUMER_SIG_EXIT); |
66 | if (ret) { | |
67 | PERROR("sigaddset exit"); | |
68 | } | |
331744e3 JD |
69 | } |
70 | ||
fa29bfbf | 71 | static int the_channel_monitor_pipe = -1; |
e9404c27 | 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, | |
d7e2822f | 81 | 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 | ||
fad4b619 JG |
179 | static int check_stream(struct lttng_consumer_stream *stream, |
180 | flush_index_cb flush_index) | |
d3e2ba59 | 181 | { |
d3e2ba59 JD |
182 | int ret; |
183 | ||
d3e2ba59 JD |
184 | /* |
185 | * While holding the stream mutex, try to take a snapshot, if it | |
186 | * succeeds, it means that data is ready to be sent, just let the data | |
187 | * thread handle that. Otherwise, if the snapshot returns EAGAIN, it | |
188 | * means that there is no data to read after the flush, so we can | |
189 | * safely send the empty index. | |
c585821b MD |
190 | * |
191 | * Doing a trylock and checking if waiting on metadata if | |
192 | * trylock fails. Bail out of the stream is indeed waiting for | |
193 | * metadata to be pushed. Busy wait on trylock otherwise. | |
d3e2ba59 | 194 | */ |
c585821b MD |
195 | for (;;) { |
196 | ret = pthread_mutex_trylock(&stream->lock); | |
197 | switch (ret) { | |
198 | case 0: | |
199 | break; /* We have the lock. */ | |
200 | case EBUSY: | |
201 | pthread_mutex_lock(&stream->metadata_timer_lock); | |
202 | if (stream->waiting_on_metadata) { | |
203 | ret = 0; | |
204 | stream->missed_metadata_flush = true; | |
205 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
206 | goto end; /* Bail out. */ | |
207 | } | |
208 | pthread_mutex_unlock(&stream->metadata_timer_lock); | |
209 | /* Try again. */ | |
210 | caa_cpu_relax(); | |
211 | continue; | |
212 | default: | |
213 | ERR("Unexpected pthread_mutex_trylock error %d", ret); | |
214 | ret = -1; | |
215 | goto end; | |
216 | } | |
217 | break; | |
218 | } | |
fad4b619 | 219 | ret = flush_index(stream); |
c585821b MD |
220 | pthread_mutex_unlock(&stream->lock); |
221 | end: | |
222 | return ret; | |
223 | } | |
224 | ||
225 | int consumer_flush_ust_index(struct lttng_consumer_stream *stream) | |
226 | { | |
227 | uint64_t ts, stream_id; | |
228 | int ret; | |
229 | ||
94d49140 JD |
230 | ret = cds_lfht_is_node_deleted(&stream->node.node); |
231 | if (ret) { | |
c585821b | 232 | goto end; |
94d49140 JD |
233 | } |
234 | ||
84a182ce | 235 | ret = lttng_ustconsumer_get_current_timestamp(stream, &ts); |
d3e2ba59 JD |
236 | if (ret < 0) { |
237 | ERR("Failed to get the current timestamp"); | |
c585821b | 238 | goto end; |
d3e2ba59 | 239 | } |
d85707b0 MD |
240 | ret = lttng_ustconsumer_flush_buffer(stream, 1); |
241 | if (ret < 0) { | |
242 | ERR("Failed to flush buffer while flushing index"); | |
243 | goto end; | |
244 | } | |
84a182ce | 245 | ret = lttng_ustconsumer_take_snapshot(stream); |
d3e2ba59 | 246 | if (ret < 0) { |
94d49140 | 247 | if (ret != -EAGAIN) { |
d3e2ba59 JD |
248 | ERR("Taking UST snapshot"); |
249 | ret = -1; | |
c585821b | 250 | goto end; |
d3e2ba59 | 251 | } |
70190e1c | 252 | ret = lttng_ustconsumer_get_stream_id(stream, &stream_id); |
528f2ffa | 253 | if (ret < 0) { |
b623cb6a | 254 | PERROR("lttng_ust_ctl_get_stream_id"); |
c585821b | 255 | goto end; |
528f2ffa | 256 | } |
d3e2ba59 | 257 | DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); |
528f2ffa | 258 | ret = send_empty_index(stream, ts, stream_id); |
d3e2ba59 | 259 | if (ret < 0) { |
c585821b | 260 | goto end; |
d3e2ba59 JD |
261 | } |
262 | } | |
263 | ret = 0; | |
c585821b MD |
264 | end: |
265 | return ret; | |
266 | } | |
d3e2ba59 | 267 | |
d3e2ba59 JD |
268 | /* |
269 | * Execute action on a live timer | |
270 | */ | |
271 | static void live_timer(struct lttng_consumer_local_data *ctx, | |
d7e2822f | 272 | siginfo_t *si) |
d3e2ba59 JD |
273 | { |
274 | int ret; | |
275 | struct lttng_consumer_channel *channel; | |
276 | struct lttng_consumer_stream *stream; | |
d3e2ba59 | 277 | struct lttng_ht_iter iter; |
fa29bfbf | 278 | const struct lttng_ht *ht = the_consumer_data.stream_per_chan_id_ht; |
fad4b619 JG |
279 | const flush_index_cb flush_index = |
280 | ctx->type == LTTNG_CONSUMER_KERNEL ? | |
281 | consumer_flush_kernel_index : | |
282 | consumer_flush_ust_index; | |
d3e2ba59 JD |
283 | |
284 | channel = si->si_value.sival_ptr; | |
285 | assert(channel); | |
286 | ||
287 | if (channel->switch_timer_error) { | |
288 | goto error; | |
289 | } | |
d3e2ba59 JD |
290 | |
291 | DBG("Live timer for channel %" PRIu64, channel->key); | |
292 | ||
293 | rcu_read_lock(); | |
fad4b619 JG |
294 | cds_lfht_for_each_entry_duplicate(ht->ht, |
295 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
296 | ht->match_fct, &channel->key, &iter.iter, | |
297 | stream, node_channel_id.node) { | |
298 | ret = check_stream(stream, flush_index); | |
299 | if (ret < 0) { | |
300 | goto error_unlock; | |
d3e2ba59 | 301 | } |
d3e2ba59 JD |
302 | } |
303 | ||
304 | error_unlock: | |
305 | rcu_read_unlock(); | |
306 | ||
307 | error: | |
308 | return; | |
309 | } | |
310 | ||
2b8f8754 MD |
311 | static |
312 | void consumer_timer_signal_thread_qs(unsigned int signr) | |
313 | { | |
314 | sigset_t pending_set; | |
315 | int ret; | |
316 | ||
317 | /* | |
318 | * We need to be the only thread interacting with the thread | |
319 | * that manages signals for teardown synchronization. | |
320 | */ | |
321 | pthread_mutex_lock(&timer_signal.lock); | |
322 | ||
323 | /* Ensure we don't have any signal queued for this channel. */ | |
324 | for (;;) { | |
325 | ret = sigemptyset(&pending_set); | |
326 | if (ret == -1) { | |
327 | PERROR("sigemptyset"); | |
328 | } | |
329 | ret = sigpending(&pending_set); | |
330 | if (ret == -1) { | |
331 | PERROR("sigpending"); | |
332 | } | |
f05a6b6d | 333 | if (!sigismember(&pending_set, signr)) { |
2b8f8754 MD |
334 | break; |
335 | } | |
336 | caa_cpu_relax(); | |
337 | } | |
338 | ||
339 | /* | |
340 | * From this point, no new signal handler will be fired that would try to | |
341 | * access "chan". However, we still need to wait for any currently | |
342 | * executing handler to complete. | |
343 | */ | |
344 | cmm_smp_mb(); | |
345 | CMM_STORE_SHARED(timer_signal.qs_done, 0); | |
346 | cmm_smp_mb(); | |
347 | ||
348 | /* | |
349 | * Kill with LTTNG_CONSUMER_SIG_TEARDOWN, so signal management thread wakes | |
350 | * up. | |
351 | */ | |
352 | kill(getpid(), LTTNG_CONSUMER_SIG_TEARDOWN); | |
353 | ||
354 | while (!CMM_LOAD_SHARED(timer_signal.qs_done)) { | |
355 | caa_cpu_relax(); | |
356 | } | |
357 | cmm_smp_mb(); | |
358 | ||
359 | pthread_mutex_unlock(&timer_signal.lock); | |
360 | } | |
361 | ||
331744e3 | 362 | /* |
e9404c27 JG |
363 | * Start a timer channel timer which will fire at a given interval |
364 | * (timer_interval_us)and fire a given signal (signal). | |
365 | * | |
366 | * Returns a negative value on error, 0 if a timer was created, and | |
367 | * a positive value if no timer was created (not an error). | |
331744e3 | 368 | */ |
e9404c27 JG |
369 | static |
370 | int consumer_channel_timer_start(timer_t *timer_id, | |
371 | struct lttng_consumer_channel *channel, | |
372 | unsigned int timer_interval_us, int signal) | |
331744e3 | 373 | { |
e9404c27 | 374 | int ret = 0, delete_ret; |
389b8e8f | 375 | struct sigevent sev = {}; |
331744e3 JD |
376 | struct itimerspec its; |
377 | ||
378 | assert(channel); | |
379 | assert(channel->key); | |
380 | ||
e9404c27 JG |
381 | if (timer_interval_us == 0) { |
382 | /* No creation needed; not an error. */ | |
383 | ret = 1; | |
384 | goto end; | |
331744e3 JD |
385 | } |
386 | ||
387 | sev.sigev_notify = SIGEV_SIGNAL; | |
e9404c27 | 388 | sev.sigev_signo = signal; |
331744e3 | 389 | sev.sigev_value.sival_ptr = channel; |
e9404c27 | 390 | ret = timer_create(CLOCKID, &sev, timer_id); |
331744e3 JD |
391 | if (ret == -1) { |
392 | PERROR("timer_create"); | |
e9404c27 | 393 | goto end; |
331744e3 | 394 | } |
331744e3 | 395 | |
e9404c27 JG |
396 | its.it_value.tv_sec = timer_interval_us / 1000000; |
397 | its.it_value.tv_nsec = (timer_interval_us % 1000000) * 1000; | |
331744e3 JD |
398 | its.it_interval.tv_sec = its.it_value.tv_sec; |
399 | its.it_interval.tv_nsec = its.it_value.tv_nsec; | |
400 | ||
e9404c27 | 401 | ret = timer_settime(*timer_id, 0, &its, NULL); |
331744e3 JD |
402 | if (ret == -1) { |
403 | PERROR("timer_settime"); | |
e9404c27 JG |
404 | goto error_destroy_timer; |
405 | } | |
406 | end: | |
407 | return ret; | |
408 | error_destroy_timer: | |
409 | delete_ret = timer_delete(*timer_id); | |
410 | if (delete_ret == -1) { | |
411 | PERROR("timer_delete"); | |
412 | } | |
413 | goto end; | |
414 | } | |
415 | ||
416 | static | |
417 | int consumer_channel_timer_stop(timer_t *timer_id, int signal) | |
418 | { | |
419 | int ret = 0; | |
420 | ||
421 | ret = timer_delete(*timer_id); | |
422 | if (ret == -1) { | |
423 | PERROR("timer_delete"); | |
424 | goto end; | |
331744e3 | 425 | } |
e9404c27 JG |
426 | |
427 | consumer_timer_signal_thread_qs(signal); | |
428 | *timer_id = 0; | |
429 | end: | |
430 | return ret; | |
431 | } | |
432 | ||
433 | /* | |
434 | * Set the channel's switch timer. | |
435 | */ | |
436 | void consumer_timer_switch_start(struct lttng_consumer_channel *channel, | |
437 | unsigned int switch_timer_interval_us) | |
438 | { | |
439 | int ret; | |
440 | ||
441 | assert(channel); | |
442 | assert(channel->key); | |
443 | ||
444 | ret = consumer_channel_timer_start(&channel->switch_timer, channel, | |
445 | switch_timer_interval_us, LTTNG_CONSUMER_SIG_SWITCH); | |
446 | ||
447 | channel->switch_timer_enabled = !!(ret == 0); | |
331744e3 JD |
448 | } |
449 | ||
450 | /* | |
e9404c27 | 451 | * Stop and delete the channel's switch timer. |
331744e3 JD |
452 | */ |
453 | void consumer_timer_switch_stop(struct lttng_consumer_channel *channel) | |
454 | { | |
455 | int ret; | |
331744e3 JD |
456 | |
457 | assert(channel); | |
458 | ||
e9404c27 JG |
459 | ret = consumer_channel_timer_stop(&channel->switch_timer, |
460 | LTTNG_CONSUMER_SIG_SWITCH); | |
331744e3 | 461 | if (ret == -1) { |
e9404c27 | 462 | ERR("Failed to stop switch timer"); |
331744e3 JD |
463 | } |
464 | ||
2b8f8754 | 465 | channel->switch_timer_enabled = 0; |
331744e3 JD |
466 | } |
467 | ||
d3e2ba59 | 468 | /* |
e9404c27 | 469 | * Set the channel's live timer. |
d3e2ba59 JD |
470 | */ |
471 | void consumer_timer_live_start(struct lttng_consumer_channel *channel, | |
e9404c27 | 472 | unsigned int live_timer_interval_us) |
d3e2ba59 JD |
473 | { |
474 | int ret; | |
d3e2ba59 JD |
475 | |
476 | assert(channel); | |
477 | assert(channel->key); | |
478 | ||
e9404c27 JG |
479 | ret = consumer_channel_timer_start(&channel->live_timer, channel, |
480 | live_timer_interval_us, LTTNG_CONSUMER_SIG_LIVE); | |
d3e2ba59 | 481 | |
e9404c27 JG |
482 | channel->live_timer_enabled = !!(ret == 0); |
483 | } | |
d3e2ba59 | 484 | |
e9404c27 JG |
485 | /* |
486 | * Stop and delete the channel's live timer. | |
487 | */ | |
488 | void consumer_timer_live_stop(struct lttng_consumer_channel *channel) | |
489 | { | |
490 | int ret; | |
491 | ||
492 | assert(channel); | |
d3e2ba59 | 493 | |
e9404c27 JG |
494 | ret = consumer_channel_timer_stop(&channel->live_timer, |
495 | LTTNG_CONSUMER_SIG_LIVE); | |
d3e2ba59 | 496 | if (ret == -1) { |
e9404c27 | 497 | ERR("Failed to stop live timer"); |
d3e2ba59 | 498 | } |
e9404c27 JG |
499 | |
500 | channel->live_timer_enabled = 0; | |
d3e2ba59 JD |
501 | } |
502 | ||
503 | /* | |
e9404c27 JG |
504 | * Set the channel's monitoring timer. |
505 | * | |
506 | * Returns a negative value on error, 0 if a timer was created, and | |
507 | * a positive value if no timer was created (not an error). | |
d3e2ba59 | 508 | */ |
e9404c27 JG |
509 | int consumer_timer_monitor_start(struct lttng_consumer_channel *channel, |
510 | unsigned int monitor_timer_interval_us) | |
d3e2ba59 JD |
511 | { |
512 | int ret; | |
513 | ||
514 | assert(channel); | |
e9404c27 JG |
515 | assert(channel->key); |
516 | assert(!channel->monitor_timer_enabled); | |
d3e2ba59 | 517 | |
e9404c27 JG |
518 | ret = consumer_channel_timer_start(&channel->monitor_timer, channel, |
519 | monitor_timer_interval_us, LTTNG_CONSUMER_SIG_MONITOR); | |
520 | channel->monitor_timer_enabled = !!(ret == 0); | |
521 | return ret; | |
522 | } | |
523 | ||
524 | /* | |
525 | * Stop and delete the channel's monitoring timer. | |
526 | */ | |
527 | int consumer_timer_monitor_stop(struct lttng_consumer_channel *channel) | |
528 | { | |
529 | int ret; | |
530 | ||
531 | assert(channel); | |
532 | assert(channel->monitor_timer_enabled); | |
533 | ||
534 | ret = consumer_channel_timer_stop(&channel->monitor_timer, | |
535 | LTTNG_CONSUMER_SIG_MONITOR); | |
d3e2ba59 | 536 | if (ret == -1) { |
e9404c27 JG |
537 | ERR("Failed to stop live timer"); |
538 | goto end; | |
d3e2ba59 JD |
539 | } |
540 | ||
e9404c27 JG |
541 | channel->monitor_timer_enabled = 0; |
542 | end: | |
543 | return ret; | |
d3e2ba59 JD |
544 | } |
545 | ||
331744e3 JD |
546 | /* |
547 | * Block the RT signals for the entire process. It must be called from the | |
548 | * consumer main before creating the threads | |
549 | */ | |
73664f81 | 550 | int consumer_signal_init(void) |
331744e3 JD |
551 | { |
552 | int ret; | |
553 | sigset_t mask; | |
554 | ||
555 | /* Block signal for entire process, so only our thread processes it. */ | |
556 | setmask(&mask); | |
557 | ret = pthread_sigmask(SIG_BLOCK, &mask, NULL); | |
558 | if (ret) { | |
559 | errno = ret; | |
560 | PERROR("pthread_sigmask"); | |
73664f81 | 561 | return -1; |
331744e3 | 562 | } |
73664f81 | 563 | return 0; |
331744e3 JD |
564 | } |
565 | ||
e9404c27 JG |
566 | static |
567 | int sample_channel_positions(struct lttng_consumer_channel *channel, | |
e8360425 | 568 | uint64_t *_highest_use, uint64_t *_lowest_use, uint64_t *_total_consumed, |
e9404c27 JG |
569 | sample_positions_cb sample, get_consumed_cb get_consumed, |
570 | get_produced_cb get_produced) | |
571 | { | |
23bc9bb5 | 572 | int ret = 0; |
e9404c27 JG |
573 | struct lttng_ht_iter iter; |
574 | struct lttng_consumer_stream *stream; | |
575 | bool empty_channel = true; | |
576 | uint64_t high = 0, low = UINT64_MAX; | |
fa29bfbf | 577 | struct lttng_ht *ht = the_consumer_data.stream_per_chan_id_ht; |
e9404c27 | 578 | |
e8360425 JD |
579 | *_total_consumed = 0; |
580 | ||
e9404c27 JG |
581 | rcu_read_lock(); |
582 | ||
583 | cds_lfht_for_each_entry_duplicate(ht->ht, | |
584 | ht->hash_fct(&channel->key, lttng_ht_seed), | |
585 | ht->match_fct, &channel->key, | |
586 | &iter.iter, stream, node_channel_id.node) { | |
587 | unsigned long produced, consumed, usage; | |
588 | ||
589 | empty_channel = false; | |
590 | ||
591 | pthread_mutex_lock(&stream->lock); | |
592 | if (cds_lfht_is_node_deleted(&stream->node.node)) { | |
593 | goto next; | |
594 | } | |
595 | ||
596 | ret = sample(stream); | |
597 | if (ret) { | |
598 | ERR("Failed to take buffer position snapshot in monitor timer (ret = %d)", ret); | |
599 | pthread_mutex_unlock(&stream->lock); | |
600 | goto end; | |
601 | } | |
602 | ret = get_consumed(stream, &consumed); | |
603 | if (ret) { | |
604 | ERR("Failed to get buffer consumed position in monitor timer"); | |
605 | pthread_mutex_unlock(&stream->lock); | |
606 | goto end; | |
607 | } | |
608 | ret = get_produced(stream, &produced); | |
609 | if (ret) { | |
610 | ERR("Failed to get buffer produced position in monitor timer"); | |
611 | pthread_mutex_unlock(&stream->lock); | |
612 | goto end; | |
613 | } | |
614 | ||
615 | usage = produced - consumed; | |
616 | high = (usage > high) ? usage : high; | |
617 | low = (usage < low) ? usage : low; | |
e8360425 JD |
618 | |
619 | /* | |
620 | * We don't use consumed here for 2 reasons: | |
621 | * - output_written takes into account the padding written in the | |
622 | * tracefiles when we stop the session; | |
623 | * - the consumed position is not the accurate representation of what | |
624 | * was extracted from a buffer in overwrite mode. | |
625 | */ | |
626 | *_total_consumed += stream->output_written; | |
e9404c27 JG |
627 | next: |
628 | pthread_mutex_unlock(&stream->lock); | |
629 | } | |
630 | ||
631 | *_highest_use = high; | |
632 | *_lowest_use = low; | |
633 | end: | |
634 | rcu_read_unlock(); | |
635 | if (empty_channel) { | |
636 | ret = -1; | |
637 | } | |
638 | return ret; | |
639 | } | |
640 | ||
641 | /* | |
642 | * Execute action on a monitor timer. | |
643 | */ | |
644 | static | |
5704917f | 645 | void monitor_timer(struct lttng_consumer_channel *channel) |
e9404c27 JG |
646 | { |
647 | int ret; | |
648 | int channel_monitor_pipe = | |
649 | consumer_timer_thread_get_channel_monitor_pipe(); | |
650 | struct lttcomm_consumer_channel_monitor_msg msg = { | |
651 | .key = channel->key, | |
652 | }; | |
653 | sample_positions_cb sample; | |
654 | get_consumed_cb get_consumed; | |
655 | get_produced_cb get_produced; | |
ef4b086e | 656 | uint64_t lowest = 0, highest = 0, total_consumed = 0; |
e9404c27 JG |
657 | |
658 | assert(channel); | |
e9404c27 JG |
659 | |
660 | if (channel_monitor_pipe < 0) { | |
873dda4e | 661 | return; |
e9404c27 JG |
662 | } |
663 | ||
fa29bfbf | 664 | switch (the_consumer_data.type) { |
e9404c27 JG |
665 | case LTTNG_CONSUMER_KERNEL: |
666 | sample = lttng_kconsumer_sample_snapshot_positions; | |
667 | get_consumed = lttng_kconsumer_get_consumed_snapshot; | |
668 | get_produced = lttng_kconsumer_get_produced_snapshot; | |
669 | break; | |
670 | case LTTNG_CONSUMER32_UST: | |
671 | case LTTNG_CONSUMER64_UST: | |
672 | sample = lttng_ustconsumer_sample_snapshot_positions; | |
673 | get_consumed = lttng_ustconsumer_get_consumed_snapshot; | |
674 | get_produced = lttng_ustconsumer_get_produced_snapshot; | |
675 | break; | |
676 | default: | |
677 | abort(); | |
678 | } | |
679 | ||
ef4b086e JG |
680 | ret = sample_channel_positions(channel, &highest, &lowest, |
681 | &total_consumed, sample, get_consumed, get_produced); | |
e9404c27 | 682 | if (ret) { |
873dda4e | 683 | return; |
e9404c27 | 684 | } |
ef4b086e JG |
685 | msg.highest = highest; |
686 | msg.lowest = lowest; | |
687 | msg.total_consumed = total_consumed; | |
e9404c27 JG |
688 | |
689 | /* | |
690 | * Writes performed here are assumed to be atomic which is only | |
691 | * guaranteed for sizes < than PIPE_BUF. | |
692 | */ | |
693 | assert(sizeof(msg) <= PIPE_BUF); | |
694 | ||
695 | do { | |
696 | ret = write(channel_monitor_pipe, &msg, sizeof(msg)); | |
697 | } while (ret == -1 && errno == EINTR); | |
698 | if (ret == -1) { | |
699 | if (errno == EAGAIN) { | |
700 | /* Not an error, the sample is merely dropped. */ | |
701 | DBG("Channel monitor pipe is full; dropping sample for channel key = %"PRIu64, | |
702 | channel->key); | |
703 | } else { | |
704 | PERROR("write to the channel monitor pipe"); | |
705 | } | |
706 | } else { | |
707 | DBG("Sent channel monitoring sample for channel key %" PRIu64 | |
708 | ", (highest = %" PRIu64 ", lowest = %"PRIu64")", | |
709 | channel->key, msg.highest, msg.lowest); | |
710 | } | |
e9404c27 JG |
711 | } |
712 | ||
713 | int consumer_timer_thread_get_channel_monitor_pipe(void) | |
714 | { | |
fa29bfbf | 715 | return uatomic_read(&the_channel_monitor_pipe); |
e9404c27 JG |
716 | } |
717 | ||
718 | int consumer_timer_thread_set_channel_monitor_pipe(int fd) | |
719 | { | |
720 | int ret; | |
721 | ||
fa29bfbf | 722 | ret = uatomic_cmpxchg(&the_channel_monitor_pipe, -1, fd); |
e9404c27 JG |
723 | if (ret != -1) { |
724 | ret = -1; | |
725 | goto end; | |
726 | } | |
727 | ret = 0; | |
728 | end: | |
729 | return ret; | |
730 | } | |
731 | ||
331744e3 | 732 | /* |
d3e2ba59 | 733 | * This thread is the sighandler for signals LTTNG_CONSUMER_SIG_SWITCH, |
e9404c27 | 734 | * LTTNG_CONSUMER_SIG_TEARDOWN, LTTNG_CONSUMER_SIG_LIVE, and |
13675d0e | 735 | * LTTNG_CONSUMER_SIG_MONITOR, LTTNG_CONSUMER_SIG_EXIT. |
331744e3 | 736 | */ |
d3e2ba59 | 737 | void *consumer_timer_thread(void *data) |
331744e3 JD |
738 | { |
739 | int signr; | |
740 | sigset_t mask; | |
741 | siginfo_t info; | |
742 | struct lttng_consumer_local_data *ctx = data; | |
743 | ||
8a9acb74 MD |
744 | rcu_register_thread(); |
745 | ||
1fc79fb4 MD |
746 | health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); |
747 | ||
2d57de81 MD |
748 | if (testpoint(consumerd_thread_metadata_timer)) { |
749 | goto error_testpoint; | |
750 | } | |
751 | ||
9ce5646a MD |
752 | health_code_update(); |
753 | ||
331744e3 JD |
754 | /* Only self thread will receive signal mask. */ |
755 | setmask(&mask); | |
756 | CMM_STORE_SHARED(timer_signal.tid, pthread_self()); | |
757 | ||
758 | while (1) { | |
9ce5646a MD |
759 | health_code_update(); |
760 | ||
761 | health_poll_entry(); | |
331744e3 | 762 | signr = sigwaitinfo(&mask, &info); |
9ce5646a | 763 | health_poll_exit(); |
e9404c27 JG |
764 | |
765 | /* | |
766 | * NOTE: cascading conditions are used instead of a switch case | |
767 | * since the use of SIGRTMIN in the definition of the signals' | |
768 | * values prevents the reduction to an integer constant. | |
769 | */ | |
331744e3 JD |
770 | if (signr == -1) { |
771 | if (errno != EINTR) { | |
772 | PERROR("sigwaitinfo"); | |
773 | } | |
774 | continue; | |
775 | } else if (signr == LTTNG_CONSUMER_SIG_SWITCH) { | |
d7e2822f | 776 | metadata_switch_timer(ctx, &info); |
331744e3 JD |
777 | } else if (signr == LTTNG_CONSUMER_SIG_TEARDOWN) { |
778 | cmm_smp_mb(); | |
779 | CMM_STORE_SHARED(timer_signal.qs_done, 1); | |
780 | cmm_smp_mb(); | |
781 | DBG("Signal timer metadata thread teardown"); | |
d3e2ba59 | 782 | } else if (signr == LTTNG_CONSUMER_SIG_LIVE) { |
d7e2822f | 783 | live_timer(ctx, &info); |
e9404c27 JG |
784 | } else if (signr == LTTNG_CONSUMER_SIG_MONITOR) { |
785 | struct lttng_consumer_channel *channel; | |
786 | ||
787 | channel = info.si_value.sival_ptr; | |
5704917f | 788 | monitor_timer(channel); |
13675d0e MD |
789 | } else if (signr == LTTNG_CONSUMER_SIG_EXIT) { |
790 | assert(CMM_LOAD_SHARED(consumer_quit)); | |
791 | goto end; | |
331744e3 JD |
792 | } else { |
793 | ERR("Unexpected signal %d\n", info.si_signo); | |
794 | } | |
795 | } | |
796 | ||
2d57de81 MD |
797 | error_testpoint: |
798 | /* Only reached in testpoint error */ | |
799 | health_error(); | |
13675d0e | 800 | end: |
1fc79fb4 | 801 | health_unregister(health_consumerd); |
8a9acb74 | 802 | rcu_unregister_thread(); |
331744e3 JD |
803 | return NULL; |
804 | } |