Commit | Line | Data |
---|---|---|
db66e574 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2017 Julien Desfossez <jdesfossez@efficios.com> |
3 | * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
db66e574 | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
db66e574 | 6 | * |
db66e574 JD |
7 | */ |
8 | ||
9 | #define _LGPL_SOURCE | |
10 | #include <lttng/trigger/trigger.h> | |
11 | #include <common/error.h> | |
12 | #include <common/config/session-config.h> | |
13 | #include <common/defaults.h> | |
14 | #include <common/utils.h> | |
15 | #include <common/futex.h> | |
16 | #include <common/align.h> | |
17 | #include <common/time.h> | |
18 | #include <common/hashtable/utils.h> | |
0331d3e5 JG |
19 | |
20 | #include <inttypes.h> | |
21 | #include <signal.h> | |
22 | #include <sys/eventfd.h> | |
db66e574 JD |
23 | #include <sys/stat.h> |
24 | #include <time.h> | |
25 | #include <signal.h> | |
26 | #include <inttypes.h> | |
27 | ||
28 | #include <common/kernel-ctl/kernel-ctl.h> | |
29 | #include <lttng/notification/channel-internal.h> | |
5c408ad8 | 30 | #include <lttng/rotate-internal.h> |
ddbee47f | 31 | #include <lttng/location-internal.h> |
46a0fbd4 | 32 | #include <lttng/condition/condition-internal.h> |
a7d0c51c | 33 | #include <lttng/notification/notification-internal.h> |
db66e574 JD |
34 | |
35 | #include "rotation-thread.h" | |
36 | #include "lttng-sessiond.h" | |
37 | #include "health-sessiond.h" | |
38 | #include "rotate.h" | |
39 | #include "cmd.h" | |
40 | #include "session.h" | |
8e319828 | 41 | #include "timer.h" |
17dd1232 | 42 | #include "notification-thread-commands.h" |
64d9b072 JG |
43 | #include "utils.h" |
44 | #include "thread.h" | |
db66e574 JD |
45 | |
46 | #include <urcu.h> | |
47 | #include <urcu/list.h> | |
db66e574 | 48 | |
90936dcf JD |
49 | struct lttng_notification_channel *rotate_notification_channel = NULL; |
50 | ||
0331d3e5 JG |
51 | /* |
52 | * This eventfd is used to wake-up the rotation thread whenever a command | |
53 | * completes on the notification channel. This ensures that any notification | |
54 | * that was queued while waiting for a reply to the command is eventually | |
55 | * consumed. | |
56 | */ | |
57 | int rotate_notification_channel_subscription_change_eventfd = -1; | |
58 | ||
92816cc3 | 59 | struct rotation_thread { |
db66e574 JD |
60 | struct lttng_poll_event events; |
61 | }; | |
62 | ||
92816cc3 JG |
63 | struct rotation_thread_job { |
64 | enum rotation_thread_job_type type; | |
c7031a2c | 65 | struct ltt_session *session; |
92816cc3 JG |
66 | /* List member in struct rotation_thread_timer_queue. */ |
67 | struct cds_list_head head; | |
68 | }; | |
69 | ||
70 | /* | |
71 | * The timer thread enqueues jobs and wakes up the rotation thread. | |
72 | * When the rotation thread wakes up, it empties the queue. | |
73 | */ | |
74 | struct rotation_thread_timer_queue { | |
75 | struct lttng_pipe *event_pipe; | |
76 | struct cds_list_head list; | |
77 | pthread_mutex_t lock; | |
78 | }; | |
79 | ||
80 | struct rotation_thread_handle { | |
92816cc3 JG |
81 | struct rotation_thread_timer_queue *rotation_timer_queue; |
82 | /* Access to the notification thread cmd_queue */ | |
83 | struct notification_thread_handle *notification_thread_handle; | |
64d9b072 JG |
84 | /* Thread-specific quit pipe. */ |
85 | struct lttng_pipe *quit_pipe; | |
92816cc3 JG |
86 | }; |
87 | ||
db66e574 | 88 | static |
92816cc3 | 89 | const char *get_job_type_str(enum rotation_thread_job_type job_type) |
db66e574 | 90 | { |
92816cc3 JG |
91 | switch (job_type) { |
92 | case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION: | |
93 | return "CHECK_PENDING_ROTATION"; | |
94 | case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION: | |
95 | return "SCHEDULED_ROTATION"; | |
96 | default: | |
97 | abort(); | |
98 | } | |
db66e574 JD |
99 | } |
100 | ||
92816cc3 | 101 | struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void) |
db66e574 | 102 | { |
92816cc3 | 103 | struct rotation_thread_timer_queue *queue = NULL; |
db66e574 | 104 | |
92816cc3 JG |
105 | queue = zmalloc(sizeof(*queue)); |
106 | if (!queue) { | |
107 | PERROR("Failed to allocate timer rotate queue"); | |
108 | goto end; | |
109 | } | |
db66e574 | 110 | |
92816cc3 JG |
111 | queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK); |
112 | CDS_INIT_LIST_HEAD(&queue->list); | |
113 | pthread_mutex_init(&queue->lock, NULL); | |
114 | end: | |
115 | return queue; | |
db66e574 JD |
116 | } |
117 | ||
92816cc3 JG |
118 | void rotation_thread_timer_queue_destroy( |
119 | struct rotation_thread_timer_queue *queue) | |
db66e574 | 120 | { |
92816cc3 JG |
121 | if (!queue) { |
122 | return; | |
db66e574 JD |
123 | } |
124 | ||
92816cc3 JG |
125 | lttng_pipe_destroy(queue->event_pipe); |
126 | ||
127 | pthread_mutex_lock(&queue->lock); | |
64d9b072 | 128 | assert(cds_list_empty(&queue->list)); |
92816cc3 JG |
129 | pthread_mutex_unlock(&queue->lock); |
130 | pthread_mutex_destroy(&queue->lock); | |
131 | free(queue); | |
132 | } | |
db66e574 | 133 | |
92816cc3 JG |
134 | /* |
135 | * Destroy the thread data previously created by the init function. | |
136 | */ | |
137 | void rotation_thread_handle_destroy( | |
138 | struct rotation_thread_handle *handle) | |
139 | { | |
64d9b072 | 140 | lttng_pipe_destroy(handle->quit_pipe); |
db66e574 JD |
141 | free(handle); |
142 | } | |
143 | ||
144 | struct rotation_thread_handle *rotation_thread_handle_create( | |
90936dcf | 145 | struct rotation_thread_timer_queue *rotation_timer_queue, |
c8a9de5a | 146 | struct notification_thread_handle *notification_thread_handle) |
db66e574 JD |
147 | { |
148 | struct rotation_thread_handle *handle; | |
149 | ||
150 | handle = zmalloc(sizeof(*handle)); | |
151 | if (!handle) { | |
152 | goto end; | |
153 | } | |
154 | ||
92816cc3 JG |
155 | handle->rotation_timer_queue = rotation_timer_queue; |
156 | handle->notification_thread_handle = notification_thread_handle; | |
64d9b072 JG |
157 | handle->quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
158 | if (!handle->quit_pipe) { | |
159 | goto error; | |
160 | } | |
92816cc3 JG |
161 | |
162 | end: | |
163 | return handle; | |
64d9b072 JG |
164 | error: |
165 | rotation_thread_handle_destroy(handle); | |
166 | return NULL; | |
92816cc3 JG |
167 | } |
168 | ||
169 | /* | |
170 | * Called with the rotation_thread_timer_queue lock held. | |
171 | * Return true if the same timer job already exists in the queue, false if not. | |
172 | */ | |
173 | static | |
174 | bool timer_job_exists(const struct rotation_thread_timer_queue *queue, | |
c7031a2c JG |
175 | enum rotation_thread_job_type job_type, |
176 | struct ltt_session *session) | |
92816cc3 JG |
177 | { |
178 | bool exists = false; | |
179 | struct rotation_thread_job *job; | |
180 | ||
181 | cds_list_for_each_entry(job, &queue->list, head) { | |
c7031a2c | 182 | if (job->session == session && job->type == job_type) { |
92816cc3 JG |
183 | exists = true; |
184 | goto end; | |
db66e574 | 185 | } |
db66e574 | 186 | } |
92816cc3 JG |
187 | end: |
188 | return exists; | |
189 | } | |
190 | ||
191 | void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue, | |
c7031a2c JG |
192 | enum rotation_thread_job_type job_type, |
193 | struct ltt_session *session) | |
92816cc3 JG |
194 | { |
195 | int ret; | |
be2956e7 | 196 | const char dummy = '!'; |
92816cc3 JG |
197 | struct rotation_thread_job *job = NULL; |
198 | const char *job_type_str = get_job_type_str(job_type); | |
199 | ||
200 | pthread_mutex_lock(&queue->lock); | |
c7031a2c | 201 | if (timer_job_exists(queue, job_type, session)) { |
92816cc3 JG |
202 | /* |
203 | * This timer job is already pending, we don't need to add | |
204 | * it. | |
205 | */ | |
206 | goto end; | |
db66e574 | 207 | } |
92816cc3 JG |
208 | |
209 | job = zmalloc(sizeof(struct rotation_thread_job)); | |
210 | if (!job) { | |
c7031a2c JG |
211 | PERROR("Failed to allocate rotation thread job of type \"%s\" for session \"%s\"", |
212 | job_type_str, session->name); | |
92816cc3 JG |
213 | goto end; |
214 | } | |
c7031a2c JG |
215 | /* No reason for this to fail as the caller must hold a reference. */ |
216 | (void) session_get(session); | |
217 | ||
218 | job->session = session; | |
92816cc3 | 219 | job->type = job_type; |
92816cc3 JG |
220 | cds_list_add_tail(&job->head, &queue->list); |
221 | ||
be2956e7 JG |
222 | ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), &dummy, |
223 | sizeof(dummy)); | |
92816cc3 JG |
224 | if (ret < 0) { |
225 | /* | |
226 | * We do not want to block in the timer handler, the job has | |
227 | * been enqueued in the list, the wakeup pipe is probably full, | |
228 | * the job will be processed when the rotation_thread catches | |
229 | * up. | |
230 | */ | |
231 | if (errno == EAGAIN || errno == EWOULDBLOCK) { | |
232 | /* | |
233 | * Not an error, but would be surprising and indicate | |
234 | * that the rotation thread can't keep up with the | |
235 | * current load. | |
236 | */ | |
237 | DBG("Wake-up pipe of rotation thread job queue is full"); | |
238 | goto end; | |
db66e574 | 239 | } |
c7031a2c JG |
240 | PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session \"%s\"", |
241 | job_type_str, session->name); | |
92816cc3 | 242 | goto end; |
db66e574 | 243 | } |
db66e574 JD |
244 | |
245 | end: | |
92816cc3 | 246 | pthread_mutex_unlock(&queue->lock); |
db66e574 JD |
247 | } |
248 | ||
249 | static | |
250 | int init_poll_set(struct lttng_poll_event *poll_set, | |
251 | struct rotation_thread_handle *handle) | |
252 | { | |
253 | int ret; | |
254 | ||
255 | /* | |
64d9b072 JG |
256 | * Create pollset with size 3: |
257 | * - rotation thread quit pipe, | |
92816cc3 | 258 | * - rotation thread timer queue pipe, |
64d9b072 | 259 | * - notification channel sock, |
db66e574 | 260 | */ |
64d9b072 JG |
261 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); |
262 | if (ret < 0) { | |
db66e574 JD |
263 | goto error; |
264 | } | |
64d9b072 JG |
265 | |
266 | ret = lttng_poll_add(poll_set, | |
267 | lttng_pipe_get_readfd(handle->quit_pipe), | |
268 | LPOLLIN | LPOLLERR); | |
269 | if (ret < 0) { | |
f91c3842 | 270 | ERR("Failed to add quit pipe read fd to poll set"); |
64d9b072 JG |
271 | goto error; |
272 | } | |
273 | ||
d086f507 JD |
274 | ret = lttng_poll_add(poll_set, |
275 | lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe), | |
276 | LPOLLIN | LPOLLERR); | |
277 | if (ret < 0) { | |
f91c3842 | 278 | ERR("Failed to add rotate_pending fd to poll set"); |
d086f507 JD |
279 | goto error; |
280 | } | |
db66e574 | 281 | |
db66e574 JD |
282 | return ret; |
283 | error: | |
284 | lttng_poll_clean(poll_set); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | static | |
92816cc3 | 289 | void fini_thread_state(struct rotation_thread *state) |
db66e574 JD |
290 | { |
291 | lttng_poll_clean(&state->events); | |
90936dcf JD |
292 | if (rotate_notification_channel) { |
293 | lttng_notification_channel_destroy(rotate_notification_channel); | |
294 | } | |
0331d3e5 JG |
295 | |
296 | if (rotate_notification_channel_subscription_change_eventfd >= 0) { | |
297 | const int close_ret = close(rotate_notification_channel_subscription_change_eventfd); | |
298 | ||
299 | if (close_ret) { | |
300 | PERROR("Failed to close rotation thread notification channel subscription change eventfd"); | |
301 | } | |
302 | } | |
db66e574 JD |
303 | } |
304 | ||
305 | static | |
306 | int init_thread_state(struct rotation_thread_handle *handle, | |
92816cc3 | 307 | struct rotation_thread *state) |
db66e574 JD |
308 | { |
309 | int ret; | |
310 | ||
311 | memset(state, 0, sizeof(*state)); | |
312 | lttng_poll_init(&state->events); | |
313 | ||
314 | ret = init_poll_set(&state->events, handle); | |
315 | if (ret) { | |
f91c3842 | 316 | ERR("Failed to initialize rotation thread poll set"); |
db66e574 JD |
317 | goto end; |
318 | } | |
319 | ||
90936dcf JD |
320 | rotate_notification_channel = lttng_notification_channel_create( |
321 | lttng_session_daemon_notification_endpoint); | |
322 | if (!rotate_notification_channel) { | |
f91c3842 | 323 | ERR("Could not create notification channel"); |
90936dcf JD |
324 | ret = -1; |
325 | goto end; | |
326 | } | |
327 | ret = lttng_poll_add(&state->events, rotate_notification_channel->socket, | |
328 | LPOLLIN | LPOLLERR); | |
329 | if (ret < 0) { | |
f91c3842 | 330 | ERR("Failed to add notification fd to pollset"); |
90936dcf JD |
331 | goto end; |
332 | } | |
333 | ||
0331d3e5 JG |
334 | rotate_notification_channel_subscription_change_eventfd = |
335 | eventfd(0, EFD_CLOEXEC | EFD_SEMAPHORE); | |
336 | if (rotate_notification_channel_subscription_change_eventfd < 0) { | |
337 | PERROR("Failed to create rotation thread notification channel subscription change eventfd"); | |
338 | ret = -1; | |
339 | goto end; | |
340 | } | |
341 | ret = lttng_poll_add( | |
342 | &state->events, rotate_notification_channel_subscription_change_eventfd, LPOLLIN); | |
343 | if (ret < 0) { | |
344 | ERR("Failed to add rotation thread notification channel subscription change eventfd to pollset"); | |
345 | goto end; | |
346 | } | |
347 | ||
db66e574 JD |
348 | end: |
349 | return ret; | |
350 | } | |
351 | ||
352 | static | |
d2956687 JG |
353 | void check_session_rotation_pending_on_consumers(struct ltt_session *session, |
354 | bool *_rotation_completed) | |
92816cc3 | 355 | { |
db582e11 | 356 | int ret = 0; |
92816cc3 JG |
357 | struct consumer_socket *socket; |
358 | struct cds_lfht_iter iter; | |
d2956687 JG |
359 | enum consumer_trace_chunk_exists_status exists_status; |
360 | uint64_t relayd_id; | |
361 | bool chunk_exists_on_peer = false; | |
362 | enum lttng_trace_chunk_status chunk_status; | |
363 | ||
364 | assert(session->chunk_being_archived); | |
92816cc3 JG |
365 | |
366 | /* | |
367 | * Check for a local pending rotation on all consumers (32-bit | |
368 | * user space, 64-bit user space, and kernel). | |
369 | */ | |
92816cc3 JG |
370 | rcu_read_lock(); |
371 | if (!session->ust_session) { | |
372 | goto skip_ust; | |
373 | } | |
374 | cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht, | |
375 | &iter, socket, node.node) { | |
d2956687 JG |
376 | relayd_id = session->ust_session->consumer->type == CONSUMER_DST_LOCAL ? |
377 | -1ULL : | |
378 | session->ust_session->consumer->net_seq_index; | |
379 | ||
380 | pthread_mutex_lock(socket->lock); | |
381 | ret = consumer_trace_chunk_exists(socket, | |
382 | relayd_id, | |
383 | session->id, session->chunk_being_archived, | |
384 | &exists_status); | |
385 | if (ret) { | |
386 | pthread_mutex_unlock(socket->lock); | |
83ed9e90 | 387 | ERR("Error occurred while checking rotation status on consumer daemon"); |
92816cc3 | 388 | goto end; |
db66e574 | 389 | } |
d2956687 | 390 | |
16100d7a | 391 | if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) { |
d2956687 JG |
392 | pthread_mutex_unlock(socket->lock); |
393 | chunk_exists_on_peer = true; | |
394 | goto end; | |
16100d7a | 395 | } |
d2956687 | 396 | pthread_mutex_unlock(socket->lock); |
16100d7a | 397 | } |
db66e574 | 398 | |
92816cc3 JG |
399 | skip_ust: |
400 | if (!session->kernel_session) { | |
401 | goto skip_kernel; | |
db66e574 | 402 | } |
92816cc3 JG |
403 | cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht, |
404 | &iter, socket, node.node) { | |
d2956687 JG |
405 | pthread_mutex_lock(socket->lock); |
406 | relayd_id = session->kernel_session->consumer->type == CONSUMER_DST_LOCAL ? | |
407 | -1ULL : | |
408 | session->kernel_session->consumer->net_seq_index; | |
409 | ||
410 | ret = consumer_trace_chunk_exists(socket, | |
411 | relayd_id, | |
412 | session->id, session->chunk_being_archived, | |
413 | &exists_status); | |
414 | if (ret) { | |
415 | pthread_mutex_unlock(socket->lock); | |
83ed9e90 | 416 | ERR("Error occurred while checking rotation status on consumer daemon"); |
92816cc3 JG |
417 | goto end; |
418 | } | |
d2956687 | 419 | |
16100d7a | 420 | if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) { |
d2956687 JG |
421 | pthread_mutex_unlock(socket->lock); |
422 | chunk_exists_on_peer = true; | |
423 | goto end; | |
16100d7a | 424 | } |
d2956687 | 425 | pthread_mutex_unlock(socket->lock); |
92816cc3 JG |
426 | } |
427 | skip_kernel: | |
428 | end: | |
429 | rcu_read_unlock(); | |
db66e574 | 430 | |
d2956687 JG |
431 | if (!chunk_exists_on_peer) { |
432 | uint64_t chunk_being_archived_id; | |
433 | ||
434 | chunk_status = lttng_trace_chunk_get_id( | |
435 | session->chunk_being_archived, | |
436 | &chunk_being_archived_id); | |
437 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
f91c3842 | 438 | DBG("Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers", |
d2956687 | 439 | chunk_being_archived_id, |
92816cc3 | 440 | session->name); |
db66e574 | 441 | } |
d2956687 | 442 | *_rotation_completed = !chunk_exists_on_peer; |
92816cc3 | 443 | if (ret) { |
2961f09e JG |
444 | ret = session_reset_rotation_state(session, |
445 | LTTNG_ROTATION_STATE_ERROR); | |
446 | if (ret) { | |
447 | ERR("Failed to reset rotation state of session \"%s\"", | |
448 | session->name); | |
449 | } | |
db66e574 | 450 | } |
db66e574 JD |
451 | } |
452 | ||
d88744a4 | 453 | /* |
92816cc3 | 454 | * Check if the last rotation was completed, called with session lock held. |
d2956687 JG |
455 | * Should only return non-zero in the event of a fatal error. Doing so will |
456 | * shutdown the thread. | |
d88744a4 JD |
457 | */ |
458 | static | |
92816cc3 JG |
459 | int check_session_rotation_pending(struct ltt_session *session, |
460 | struct notification_thread_handle *notification_thread_handle) | |
d88744a4 JD |
461 | { |
462 | int ret; | |
92816cc3 | 463 | struct lttng_trace_archive_location *location; |
d2956687 JG |
464 | enum lttng_trace_chunk_status chunk_status; |
465 | bool rotation_completed = false; | |
466 | const char *archived_chunk_name; | |
467 | uint64_t chunk_being_archived_id; | |
468 | ||
dc1d5967 FD |
469 | if (!session->chunk_being_archived) { |
470 | ret = 0; | |
471 | goto end; | |
472 | } | |
473 | ||
d2956687 JG |
474 | chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived, |
475 | &chunk_being_archived_id); | |
476 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
d88744a4 | 477 | |
f91c3842 | 478 | DBG("Checking for pending rotation on session \"%s\", trace archive %" PRIu64, |
d2956687 JG |
479 | session->name, chunk_being_archived_id); |
480 | ||
faf1bdcf JG |
481 | /* |
482 | * The rotation-pending check timer of a session is launched in | |
483 | * one-shot mode. If the rotation is incomplete, the rotation | |
484 | * thread will re-enable the pending-check timer. | |
485 | * | |
486 | * The timer thread can't stop the timer itself since it is involved | |
487 | * in the check for the timer's quiescence. | |
488 | */ | |
489 | ret = timer_session_rotation_pending_check_stop(session); | |
490 | if (ret) { | |
6ae1bf46 | 491 | goto check_ongoing_rotation; |
faf1bdcf JG |
492 | } |
493 | ||
d2956687 JG |
494 | check_session_rotation_pending_on_consumers(session, |
495 | &rotation_completed); | |
d2956687 JG |
496 | if (!rotation_completed || |
497 | session->rotation_state == LTTNG_ROTATION_STATE_ERROR) { | |
6ae1bf46 | 498 | goto check_ongoing_rotation; |
92816cc3 JG |
499 | } |
500 | ||
92816cc3 JG |
501 | /* |
502 | * Now we can clear the "ONGOING" state in the session. New | |
503 | * rotations can start now. | |
504 | */ | |
d2956687 JG |
505 | chunk_status = lttng_trace_chunk_get_name(session->chunk_being_archived, |
506 | &archived_chunk_name, NULL); | |
507 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
508 | free(session->last_archived_chunk_name); | |
509 | session->last_archived_chunk_name = strdup(archived_chunk_name); | |
510 | if (!session->last_archived_chunk_name) { | |
511 | PERROR("Failed to duplicate archived chunk name"); | |
512 | } | |
513 | session_reset_rotation_state(session, LTTNG_ROTATION_STATE_COMPLETED); | |
92816cc3 | 514 | |
7fdbed1c JG |
515 | if (!session->quiet_rotation) { |
516 | location = session_get_trace_archive_location(session); | |
7fdbed1c JG |
517 | ret = notification_thread_command_session_rotation_completed( |
518 | notification_thread_handle, | |
519 | session->name, | |
520 | session->uid, | |
521 | session->gid, | |
522 | session->last_archived_chunk_id.value, | |
523 | location); | |
ddbee47f | 524 | lttng_trace_archive_location_put(location); |
7fdbed1c | 525 | if (ret != LTTNG_OK) { |
f91c3842 | 526 | ERR("Failed to notify notification thread of completed rotation for session %s", |
7fdbed1c JG |
527 | session->name); |
528 | } | |
92816cc3 JG |
529 | } |
530 | ||
531 | ret = 0; | |
6ae1bf46 | 532 | check_ongoing_rotation: |
92816cc3 | 533 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
d2956687 JG |
534 | chunk_status = lttng_trace_chunk_get_id( |
535 | session->chunk_being_archived, | |
536 | &chunk_being_archived_id); | |
537 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
538 | ||
f91c3842 | 539 | DBG("Rotation of trace archive %" PRIu64 " is still pending for session %s", |
d2956687 | 540 | chunk_being_archived_id, session->name); |
92816cc3 JG |
541 | ret = timer_session_rotation_pending_check_start(session, |
542 | DEFAULT_ROTATE_PENDING_TIMER); | |
543 | if (ret) { | |
d2956687 | 544 | ERR("Failed to re-enable rotation pending timer"); |
92816cc3 JG |
545 | ret = -1; |
546 | goto end; | |
547 | } | |
548 | } | |
549 | ||
6ae1bf46 | 550 | end: |
d88744a4 JD |
551 | return ret; |
552 | } | |
553 | ||
ed1e52a3 | 554 | /* Call with the session and session_list locks held. */ |
259c2674 | 555 | static |
92816cc3 | 556 | int launch_session_rotation(struct ltt_session *session) |
259c2674 JD |
557 | { |
558 | int ret; | |
92816cc3 | 559 | struct lttng_rotate_session_return rotation_return; |
259c2674 | 560 | |
f91c3842 | 561 | DBG("Launching scheduled time-based rotation on session \"%s\"", |
92816cc3 | 562 | session->name); |
259c2674 | 563 | |
343defc2 MD |
564 | ret = cmd_rotate_session(session, &rotation_return, false, |
565 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
92816cc3 | 566 | if (ret == LTTNG_OK) { |
f91c3842 | 567 | DBG("Scheduled time-based rotation successfully launched on session \"%s\"", |
92816cc3 JG |
568 | session->name); |
569 | } else { | |
570 | /* Don't consider errors as fatal. */ | |
f91c3842 | 571 | DBG("Scheduled time-based rotation aborted for session %s: %s", |
92816cc3 | 572 | session->name, lttng_strerror(ret)); |
259c2674 | 573 | } |
92816cc3 JG |
574 | return 0; |
575 | } | |
259c2674 | 576 | |
92816cc3 JG |
577 | static |
578 | int run_job(struct rotation_thread_job *job, struct ltt_session *session, | |
579 | struct notification_thread_handle *notification_thread_handle) | |
580 | { | |
581 | int ret; | |
259c2674 | 582 | |
92816cc3 JG |
583 | switch (job->type) { |
584 | case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION: | |
16100d7a | 585 | ret = launch_session_rotation(session); |
92816cc3 JG |
586 | break; |
587 | case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION: | |
588 | ret = check_session_rotation_pending(session, | |
589 | notification_thread_handle); | |
590 | break; | |
591 | default: | |
592 | abort(); | |
259c2674 | 593 | } |
259c2674 JD |
594 | return ret; |
595 | } | |
596 | ||
d88744a4 | 597 | static |
92816cc3 JG |
598 | int handle_job_queue(struct rotation_thread_handle *handle, |
599 | struct rotation_thread *state, | |
d88744a4 JD |
600 | struct rotation_thread_timer_queue *queue) |
601 | { | |
602 | int ret = 0; | |
d88744a4 JD |
603 | |
604 | for (;;) { | |
e32d7f27 | 605 | struct ltt_session *session; |
92816cc3 | 606 | struct rotation_thread_job *job; |
d88744a4 | 607 | |
92816cc3 | 608 | /* Take the queue lock only to pop an element from the list. */ |
d88744a4 JD |
609 | pthread_mutex_lock(&queue->lock); |
610 | if (cds_list_empty(&queue->list)) { | |
611 | pthread_mutex_unlock(&queue->lock); | |
612 | break; | |
613 | } | |
92816cc3 JG |
614 | job = cds_list_first_entry(&queue->list, |
615 | typeof(*job), head); | |
616 | cds_list_del(&job->head); | |
d88744a4 JD |
617 | pthread_mutex_unlock(&queue->lock); |
618 | ||
d88744a4 | 619 | session_lock_list(); |
c7031a2c | 620 | session = job->session; |
d88744a4 | 621 | if (!session) { |
d88744a4 | 622 | /* |
92816cc3 JG |
623 | * This is a non-fatal error, and we cannot report it to |
624 | * the user (timer), so just print the error and | |
625 | * continue the processing. | |
626 | * | |
627 | * While the timer thread will purge pending signals for | |
628 | * a session on the session's destruction, it is | |
629 | * possible for a job targeting that session to have | |
630 | * already been queued before it was destroyed. | |
d88744a4 | 631 | */ |
92816cc3 | 632 | free(job); |
e32d7f27 | 633 | session_put(session); |
5b8139c6 | 634 | session_unlock_list(); |
d88744a4 JD |
635 | continue; |
636 | } | |
637 | ||
d88744a4 | 638 | session_lock(session); |
16100d7a | 639 | ret = run_job(job, session, handle->notification_thread_handle); |
d88744a4 | 640 | session_unlock(session); |
faf1bdcf | 641 | /* Release reference held by the job. */ |
e32d7f27 | 642 | session_put(session); |
ed1e52a3 | 643 | session_unlock_list(); |
92816cc3 | 644 | free(job); |
d88744a4 | 645 | if (ret) { |
d88744a4 JD |
646 | goto end; |
647 | } | |
648 | } | |
649 | ||
650 | ret = 0; | |
651 | ||
652 | end: | |
653 | return ret; | |
654 | } | |
655 | ||
92816cc3 | 656 | static |
a7d0c51c | 657 | int handle_condition(const struct lttng_notification *notification, |
90936dcf JD |
658 | struct notification_thread_handle *notification_thread_handle) |
659 | { | |
660 | int ret = 0; | |
661 | const char *condition_session_name = NULL; | |
662 | enum lttng_condition_type condition_type; | |
663 | enum lttng_condition_status condition_status; | |
664 | enum lttng_evaluation_status evaluation_status; | |
665 | uint64_t consumed; | |
666 | struct ltt_session *session; | |
a7d0c51c JG |
667 | const struct lttng_condition *condition = |
668 | lttng_notification_get_const_condition(notification); | |
669 | const struct lttng_evaluation *evaluation = | |
670 | lttng_notification_get_const_evaluation(notification); | |
90936dcf JD |
671 | |
672 | condition_type = lttng_condition_get_type(condition); | |
673 | ||
674 | if (condition_type != LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE) { | |
675 | ret = -1; | |
f91c3842 | 676 | ERR("Condition type and session usage type are not the same"); |
90936dcf JD |
677 | goto end; |
678 | } | |
679 | ||
680 | /* Fetch info to test */ | |
681 | condition_status = lttng_condition_session_consumed_size_get_session_name( | |
682 | condition, &condition_session_name); | |
683 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
f91c3842 | 684 | ERR("Session name could not be fetched"); |
90936dcf JD |
685 | ret = -1; |
686 | goto end; | |
687 | } | |
688 | evaluation_status = lttng_evaluation_session_consumed_size_get_consumed_size(evaluation, | |
689 | &consumed); | |
690 | if (evaluation_status != LTTNG_EVALUATION_STATUS_OK) { | |
f91c3842 | 691 | ERR("Failed to get evaluation"); |
90936dcf JD |
692 | ret = -1; |
693 | goto end; | |
694 | } | |
695 | ||
696 | session_lock_list(); | |
697 | session = session_find_by_name(condition_session_name); | |
698 | if (!session) { | |
46a0fbd4 JG |
699 | DBG("Failed to find session while handling notification: notification type = %s, session name = `%s`", |
700 | lttng_condition_type_str(condition_type), | |
90936dcf | 701 | condition_session_name); |
46a0fbd4 JG |
702 | /* |
703 | * Not a fatal error: a session can be destroyed before we get | |
704 | * the chance to handle the notification. | |
705 | */ | |
706 | ret = 0; | |
707 | session_unlock_list(); | |
90936dcf JD |
708 | goto end; |
709 | } | |
710 | session_lock(session); | |
90936dcf | 711 | |
a7d0c51c JG |
712 | if (!lttng_trigger_is_equal(session->rotate_trigger, |
713 | lttng_notification_get_const_trigger(notification))) { | |
714 | /* Notification does not originate from our rotation trigger. */ | |
715 | ret = 0; | |
716 | goto end_unlock; | |
717 | } | |
718 | ||
90936dcf JD |
719 | ret = unsubscribe_session_consumed_size_rotation(session, |
720 | notification_thread_handle); | |
721 | if (ret) { | |
490b3229 | 722 | goto end_unlock; |
90936dcf JD |
723 | } |
724 | ||
386d53c1 JG |
725 | ret = cmd_rotate_session( |
726 | session, NULL, false, LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
727 | switch (ret) { | |
728 | case LTTNG_OK: | |
729 | break; | |
730 | case -LTTNG_ERR_ROTATION_PENDING: | |
90936dcf | 731 | DBG("Rotate already pending, subscribe to the next threshold value"); |
386d53c1 JG |
732 | break; |
733 | case -LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP: | |
734 | DBG("Rotation already happened since last stop, subscribe to the next threshold value"); | |
735 | break; | |
736 | case -LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR: | |
737 | DBG("Rotation already happened since last stop and clear, subscribe to the next threshold value"); | |
738 | break; | |
739 | default: | |
740 | ERR("Failed to rotate on size notification with error: %s", lttng_strerror(ret)); | |
90936dcf JD |
741 | ret = -1; |
742 | goto end_unlock; | |
743 | } | |
386d53c1 JG |
744 | |
745 | ret = subscribe_session_consumed_size_rotation( | |
746 | session, consumed + session->rotate_size, notification_thread_handle); | |
90936dcf | 747 | if (ret) { |
f91c3842 | 748 | ERR("Failed to subscribe to session consumed size condition"); |
90936dcf JD |
749 | goto end_unlock; |
750 | } | |
751 | ret = 0; | |
752 | ||
753 | end_unlock: | |
754 | session_unlock(session); | |
e32d7f27 | 755 | session_put(session); |
5b8139c6 | 756 | session_unlock_list(); |
90936dcf JD |
757 | end: |
758 | return ret; | |
759 | } | |
760 | ||
761 | static | |
92816cc3 | 762 | int handle_notification_channel(int fd, |
90936dcf | 763 | struct rotation_thread_handle *handle, |
92816cc3 | 764 | struct rotation_thread *state) |
90936dcf JD |
765 | { |
766 | int ret; | |
0331d3e5 | 767 | bool notification_pending = true; |
d73ee93f | 768 | struct lttng_notification *notification = NULL; |
90936dcf | 769 | enum lttng_notification_channel_status status; |
90936dcf | 770 | |
0331d3e5 JG |
771 | /* |
772 | * A notification channel may have multiple notifications queued-up internally in | |
773 | * its buffers. This is because a notification channel multiplexes command replies | |
774 | * and notifications. The current protocol specifies that multiple notifications can be | |
775 | * received before the reply to a command. | |
776 | * | |
777 | * In such cases, the notification channel client implementation internally queues them and | |
778 | * provides them on the next calls to lttng_notification_channel_get_next_notification(). | |
779 | * This is correct with respect to the public API, which is intended to be used in "blocking | |
780 | * mode". | |
781 | * | |
782 | * However, this internal user relies on poll/epoll to wake-up when data is available | |
783 | * on the notification channel's socket. As such, it can't assume that a wake-up means only | |
784 | * one notification is available for consumption since many of them may have been queued in | |
785 | * the channel's internal buffers. | |
786 | */ | |
787 | while (notification_pending) { | |
788 | status = lttng_notification_channel_has_pending_notification( | |
d73ee93f | 789 | rotate_notification_channel, ¬ification_pending); |
0331d3e5 JG |
790 | if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { |
791 | ERR("Error occurred while checking for pending notification"); | |
792 | ret = -1; | |
793 | goto end; | |
794 | } | |
d73ee93f | 795 | |
0331d3e5 JG |
796 | if (!notification_pending) { |
797 | ret = 0; | |
798 | goto end; | |
799 | } | |
d73ee93f | 800 | |
0331d3e5 JG |
801 | /* Receive the next notification. */ |
802 | status = lttng_notification_channel_get_next_notification( | |
803 | rotate_notification_channel, ¬ification); | |
804 | switch (status) { | |
805 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK: | |
806 | break; | |
807 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED: | |
808 | WARN("Dropped notification detected on notification channel used by the rotation management thread."); | |
809 | ret = 0; | |
810 | goto end; | |
811 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED: | |
812 | ERR("Notification channel was closed"); | |
813 | ret = -1; | |
814 | goto end; | |
815 | default: | |
816 | /* Unhandled conditions / errors. */ | |
817 | ERR("Unknown notification channel status"); | |
818 | ret = -1; | |
819 | goto end; | |
820 | } | |
90936dcf | 821 | |
0331d3e5 JG |
822 | ret = handle_condition(notification, handle->notification_thread_handle); |
823 | lttng_notification_destroy(notification); | |
824 | if (ret) { | |
825 | goto end; | |
826 | } | |
90936dcf | 827 | } |
90936dcf | 828 | end: |
90936dcf JD |
829 | return ret; |
830 | } | |
831 | ||
2c0c9bbc | 832 | static |
db66e574 JD |
833 | void *thread_rotation(void *data) |
834 | { | |
835 | int ret; | |
836 | struct rotation_thread_handle *handle = data; | |
92816cc3 | 837 | struct rotation_thread thread; |
87380d40 | 838 | int queue_pipe_fd; |
db66e574 | 839 | |
f91c3842 | 840 | DBG("Started rotation thread"); |
f620cc28 JG |
841 | rcu_register_thread(); |
842 | rcu_thread_online(); | |
412d7227 | 843 | health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); |
f620cc28 | 844 | health_code_update(); |
db66e574 JD |
845 | |
846 | if (!handle) { | |
f91c3842 | 847 | ERR("Invalid thread context provided"); |
db66e574 JD |
848 | goto end; |
849 | } | |
850 | ||
87380d40 JR |
851 | queue_pipe_fd = lttng_pipe_get_readfd( |
852 | handle->rotation_timer_queue->event_pipe); | |
853 | ||
db66e574 | 854 | |
92816cc3 | 855 | ret = init_thread_state(handle, &thread); |
db66e574 | 856 | if (ret) { |
f5f8e5cd | 857 | goto error; |
db66e574 JD |
858 | } |
859 | ||
db66e574 JD |
860 | while (true) { |
861 | int fd_count, i; | |
862 | ||
863 | health_poll_entry(); | |
f91c3842 | 864 | DBG("Entering poll wait"); |
92816cc3 | 865 | ret = lttng_poll_wait(&thread.events, -1); |
f91c3842 | 866 | DBG("Poll wait returned (%i)", ret); |
db66e574 JD |
867 | health_poll_exit(); |
868 | if (ret < 0) { | |
869 | /* | |
870 | * Restart interrupted system call. | |
871 | */ | |
872 | if (errno == EINTR) { | |
873 | continue; | |
874 | } | |
f91c3842 | 875 | ERR("Error encountered during lttng_poll_wait (%i)", ret); |
db66e574 JD |
876 | goto error; |
877 | } | |
878 | ||
879 | fd_count = ret; | |
880 | for (i = 0; i < fd_count; i++) { | |
92816cc3 JG |
881 | int fd = LTTNG_POLL_GETFD(&thread.events, i); |
882 | uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i); | |
db66e574 | 883 | |
f91c3842 | 884 | DBG("Handling fd (%i) activity (%u)", |
db66e574 JD |
885 | fd, revents); |
886 | ||
92816cc3 | 887 | if (revents & LPOLLERR) { |
f91c3842 | 888 | ERR("Polling returned an error on fd %i", fd); |
92816cc3 JG |
889 | goto error; |
890 | } | |
891 | ||
0331d3e5 JG |
892 | if (fd == rotate_notification_channel->socket || |
893 | fd == rotate_notification_channel_subscription_change_eventfd) { | |
894 | ret = handle_notification_channel(fd, handle, &thread); | |
85e17b27 | 895 | if (ret) { |
f91c3842 | 896 | ERR("Error occurred while handling activity on notification channel socket"); |
85e17b27 JG |
897 | goto error; |
898 | } | |
0331d3e5 JG |
899 | |
900 | if (fd == rotate_notification_channel_subscription_change_eventfd) { | |
901 | uint64_t eventfd_value; | |
902 | const int read_ret = lttng_read(fd, &eventfd_value, sizeof(eventfd_value)); | |
903 | ||
904 | if (read_ret != sizeof(eventfd_value)) { | |
905 | PERROR("Failed to read value from rotation thread as writing to the rotation thread notification channel subscription change eventfd"); | |
906 | goto error; | |
907 | } | |
908 | } | |
85e17b27 JG |
909 | } else { |
910 | /* Job queue or quit pipe activity. */ | |
85e17b27 JG |
911 | |
912 | /* | |
913 | * The job queue is serviced if there is | |
914 | * activity on the quit pipe to ensure it is | |
915 | * flushed and all references held in the queue | |
916 | * are released. | |
917 | */ | |
92816cc3 JG |
918 | ret = handle_job_queue(handle, &thread, |
919 | handle->rotation_timer_queue); | |
d88744a4 | 920 | if (ret) { |
f91c3842 | 921 | ERR("Failed to handle rotation timer pipe event"); |
d88744a4 JD |
922 | goto error; |
923 | } | |
85e17b27 | 924 | |
64d9b072 JG |
925 | if (fd == queue_pipe_fd) { |
926 | char buf; | |
927 | ||
928 | ret = lttng_read(fd, &buf, 1); | |
929 | if (ret != 1) { | |
f91c3842 | 930 | ERR("Failed to read from wakeup pipe (fd = %i)", fd); |
64d9b072 JG |
931 | goto error; |
932 | } | |
933 | } else { | |
f91c3842 | 934 | DBG("Quit pipe activity"); |
85e17b27 | 935 | goto exit; |
90936dcf | 936 | } |
db66e574 JD |
937 | } |
938 | } | |
939 | } | |
940 | exit: | |
941 | error: | |
f91c3842 | 942 | DBG("Thread exit"); |
92816cc3 | 943 | fini_thread_state(&thread); |
f620cc28 | 944 | end: |
412d7227 | 945 | health_unregister(the_health_sessiond); |
03732c32 JG |
946 | rcu_thread_offline(); |
947 | rcu_unregister_thread(); | |
db66e574 JD |
948 | return NULL; |
949 | } | |
64d9b072 JG |
950 | |
951 | static | |
952 | bool shutdown_rotation_thread(void *thread_data) | |
953 | { | |
954 | struct rotation_thread_handle *handle = thread_data; | |
955 | const int write_fd = lttng_pipe_get_writefd(handle->quit_pipe); | |
956 | ||
957 | return notify_thread_pipe(write_fd) == 1; | |
958 | } | |
959 | ||
960 | bool launch_rotation_thread(struct rotation_thread_handle *handle) | |
961 | { | |
962 | struct lttng_thread *thread; | |
963 | ||
964 | thread = lttng_thread_create("Rotation", | |
965 | thread_rotation, | |
966 | shutdown_rotation_thread, | |
967 | NULL, | |
968 | handle); | |
969 | if (!thread) { | |
970 | goto error; | |
971 | } | |
972 | lttng_thread_put(thread); | |
973 | return true; | |
974 | error: | |
975 | return false; | |
976 | } |