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> | |
db66e574 JD |
19 | #include <sys/stat.h> |
20 | #include <time.h> | |
21 | #include <signal.h> | |
22 | #include <inttypes.h> | |
23 | ||
24 | #include <common/kernel-ctl/kernel-ctl.h> | |
25 | #include <lttng/notification/channel-internal.h> | |
5c408ad8 | 26 | #include <lttng/rotate-internal.h> |
db66e574 JD |
27 | |
28 | #include "rotation-thread.h" | |
29 | #include "lttng-sessiond.h" | |
30 | #include "health-sessiond.h" | |
31 | #include "rotate.h" | |
32 | #include "cmd.h" | |
33 | #include "session.h" | |
8e319828 | 34 | #include "timer.h" |
17dd1232 | 35 | #include "notification-thread-commands.h" |
64d9b072 JG |
36 | #include "utils.h" |
37 | #include "thread.h" | |
db66e574 JD |
38 | |
39 | #include <urcu.h> | |
40 | #include <urcu/list.h> | |
db66e574 | 41 | |
90936dcf JD |
42 | struct lttng_notification_channel *rotate_notification_channel = NULL; |
43 | ||
92816cc3 | 44 | struct rotation_thread { |
db66e574 JD |
45 | struct lttng_poll_event events; |
46 | }; | |
47 | ||
92816cc3 JG |
48 | struct rotation_thread_job { |
49 | enum rotation_thread_job_type type; | |
c7031a2c | 50 | struct ltt_session *session; |
92816cc3 JG |
51 | /* List member in struct rotation_thread_timer_queue. */ |
52 | struct cds_list_head head; | |
53 | }; | |
54 | ||
55 | /* | |
56 | * The timer thread enqueues jobs and wakes up the rotation thread. | |
57 | * When the rotation thread wakes up, it empties the queue. | |
58 | */ | |
59 | struct rotation_thread_timer_queue { | |
60 | struct lttng_pipe *event_pipe; | |
61 | struct cds_list_head list; | |
62 | pthread_mutex_t lock; | |
63 | }; | |
64 | ||
65 | struct rotation_thread_handle { | |
92816cc3 JG |
66 | struct rotation_thread_timer_queue *rotation_timer_queue; |
67 | /* Access to the notification thread cmd_queue */ | |
68 | struct notification_thread_handle *notification_thread_handle; | |
64d9b072 JG |
69 | /* Thread-specific quit pipe. */ |
70 | struct lttng_pipe *quit_pipe; | |
92816cc3 JG |
71 | }; |
72 | ||
db66e574 | 73 | static |
92816cc3 | 74 | const char *get_job_type_str(enum rotation_thread_job_type job_type) |
db66e574 | 75 | { |
92816cc3 JG |
76 | switch (job_type) { |
77 | case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION: | |
78 | return "CHECK_PENDING_ROTATION"; | |
79 | case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION: | |
80 | return "SCHEDULED_ROTATION"; | |
81 | default: | |
82 | abort(); | |
83 | } | |
db66e574 JD |
84 | } |
85 | ||
92816cc3 | 86 | struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void) |
db66e574 | 87 | { |
92816cc3 | 88 | struct rotation_thread_timer_queue *queue = NULL; |
db66e574 | 89 | |
92816cc3 JG |
90 | queue = zmalloc(sizeof(*queue)); |
91 | if (!queue) { | |
92 | PERROR("Failed to allocate timer rotate queue"); | |
93 | goto end; | |
94 | } | |
db66e574 | 95 | |
92816cc3 JG |
96 | queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK); |
97 | CDS_INIT_LIST_HEAD(&queue->list); | |
98 | pthread_mutex_init(&queue->lock, NULL); | |
99 | end: | |
100 | return queue; | |
db66e574 JD |
101 | } |
102 | ||
92816cc3 JG |
103 | void rotation_thread_timer_queue_destroy( |
104 | struct rotation_thread_timer_queue *queue) | |
db66e574 | 105 | { |
92816cc3 JG |
106 | if (!queue) { |
107 | return; | |
db66e574 JD |
108 | } |
109 | ||
92816cc3 JG |
110 | lttng_pipe_destroy(queue->event_pipe); |
111 | ||
112 | pthread_mutex_lock(&queue->lock); | |
64d9b072 | 113 | assert(cds_list_empty(&queue->list)); |
92816cc3 JG |
114 | pthread_mutex_unlock(&queue->lock); |
115 | pthread_mutex_destroy(&queue->lock); | |
116 | free(queue); | |
117 | } | |
db66e574 | 118 | |
92816cc3 JG |
119 | /* |
120 | * Destroy the thread data previously created by the init function. | |
121 | */ | |
122 | void rotation_thread_handle_destroy( | |
123 | struct rotation_thread_handle *handle) | |
124 | { | |
64d9b072 | 125 | lttng_pipe_destroy(handle->quit_pipe); |
db66e574 JD |
126 | free(handle); |
127 | } | |
128 | ||
129 | struct rotation_thread_handle *rotation_thread_handle_create( | |
90936dcf | 130 | struct rotation_thread_timer_queue *rotation_timer_queue, |
c8a9de5a | 131 | struct notification_thread_handle *notification_thread_handle) |
db66e574 JD |
132 | { |
133 | struct rotation_thread_handle *handle; | |
134 | ||
135 | handle = zmalloc(sizeof(*handle)); | |
136 | if (!handle) { | |
137 | goto end; | |
138 | } | |
139 | ||
92816cc3 JG |
140 | handle->rotation_timer_queue = rotation_timer_queue; |
141 | handle->notification_thread_handle = notification_thread_handle; | |
64d9b072 JG |
142 | handle->quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
143 | if (!handle->quit_pipe) { | |
144 | goto error; | |
145 | } | |
92816cc3 JG |
146 | |
147 | end: | |
148 | return handle; | |
64d9b072 JG |
149 | error: |
150 | rotation_thread_handle_destroy(handle); | |
151 | return NULL; | |
92816cc3 JG |
152 | } |
153 | ||
154 | /* | |
155 | * Called with the rotation_thread_timer_queue lock held. | |
156 | * Return true if the same timer job already exists in the queue, false if not. | |
157 | */ | |
158 | static | |
159 | bool timer_job_exists(const struct rotation_thread_timer_queue *queue, | |
c7031a2c JG |
160 | enum rotation_thread_job_type job_type, |
161 | struct ltt_session *session) | |
92816cc3 JG |
162 | { |
163 | bool exists = false; | |
164 | struct rotation_thread_job *job; | |
165 | ||
166 | cds_list_for_each_entry(job, &queue->list, head) { | |
c7031a2c | 167 | if (job->session == session && job->type == job_type) { |
92816cc3 JG |
168 | exists = true; |
169 | goto end; | |
db66e574 | 170 | } |
db66e574 | 171 | } |
92816cc3 JG |
172 | end: |
173 | return exists; | |
174 | } | |
175 | ||
176 | void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue, | |
c7031a2c JG |
177 | enum rotation_thread_job_type job_type, |
178 | struct ltt_session *session) | |
92816cc3 JG |
179 | { |
180 | int ret; | |
be2956e7 | 181 | const char dummy = '!'; |
92816cc3 JG |
182 | struct rotation_thread_job *job = NULL; |
183 | const char *job_type_str = get_job_type_str(job_type); | |
184 | ||
185 | pthread_mutex_lock(&queue->lock); | |
c7031a2c | 186 | if (timer_job_exists(queue, job_type, session)) { |
92816cc3 JG |
187 | /* |
188 | * This timer job is already pending, we don't need to add | |
189 | * it. | |
190 | */ | |
191 | goto end; | |
db66e574 | 192 | } |
92816cc3 JG |
193 | |
194 | job = zmalloc(sizeof(struct rotation_thread_job)); | |
195 | if (!job) { | |
c7031a2c JG |
196 | PERROR("Failed to allocate rotation thread job of type \"%s\" for session \"%s\"", |
197 | job_type_str, session->name); | |
92816cc3 JG |
198 | goto end; |
199 | } | |
c7031a2c JG |
200 | /* No reason for this to fail as the caller must hold a reference. */ |
201 | (void) session_get(session); | |
202 | ||
203 | job->session = session; | |
92816cc3 | 204 | job->type = job_type; |
92816cc3 JG |
205 | cds_list_add_tail(&job->head, &queue->list); |
206 | ||
be2956e7 JG |
207 | ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), &dummy, |
208 | sizeof(dummy)); | |
92816cc3 JG |
209 | if (ret < 0) { |
210 | /* | |
211 | * We do not want to block in the timer handler, the job has | |
212 | * been enqueued in the list, the wakeup pipe is probably full, | |
213 | * the job will be processed when the rotation_thread catches | |
214 | * up. | |
215 | */ | |
216 | if (errno == EAGAIN || errno == EWOULDBLOCK) { | |
217 | /* | |
218 | * Not an error, but would be surprising and indicate | |
219 | * that the rotation thread can't keep up with the | |
220 | * current load. | |
221 | */ | |
222 | DBG("Wake-up pipe of rotation thread job queue is full"); | |
223 | goto end; | |
db66e574 | 224 | } |
c7031a2c JG |
225 | PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session \"%s\"", |
226 | job_type_str, session->name); | |
92816cc3 | 227 | goto end; |
db66e574 | 228 | } |
db66e574 JD |
229 | |
230 | end: | |
92816cc3 | 231 | pthread_mutex_unlock(&queue->lock); |
db66e574 JD |
232 | } |
233 | ||
234 | static | |
235 | int init_poll_set(struct lttng_poll_event *poll_set, | |
236 | struct rotation_thread_handle *handle) | |
237 | { | |
238 | int ret; | |
239 | ||
240 | /* | |
64d9b072 JG |
241 | * Create pollset with size 3: |
242 | * - rotation thread quit pipe, | |
92816cc3 | 243 | * - rotation thread timer queue pipe, |
64d9b072 | 244 | * - notification channel sock, |
db66e574 | 245 | */ |
64d9b072 JG |
246 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); |
247 | if (ret < 0) { | |
db66e574 JD |
248 | goto error; |
249 | } | |
64d9b072 JG |
250 | |
251 | ret = lttng_poll_add(poll_set, | |
252 | lttng_pipe_get_readfd(handle->quit_pipe), | |
253 | LPOLLIN | LPOLLERR); | |
254 | if (ret < 0) { | |
255 | ERR("[rotation-thread] Failed to add quit pipe read fd to poll set"); | |
256 | goto error; | |
257 | } | |
258 | ||
d086f507 JD |
259 | ret = lttng_poll_add(poll_set, |
260 | lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe), | |
261 | LPOLLIN | LPOLLERR); | |
262 | if (ret < 0) { | |
64d9b072 | 263 | ERR("[rotation-thread] Failed to add rotate_pending fd to poll set"); |
d086f507 JD |
264 | goto error; |
265 | } | |
db66e574 | 266 | |
db66e574 JD |
267 | return ret; |
268 | error: | |
269 | lttng_poll_clean(poll_set); | |
270 | return ret; | |
271 | } | |
272 | ||
273 | static | |
92816cc3 | 274 | void fini_thread_state(struct rotation_thread *state) |
db66e574 JD |
275 | { |
276 | lttng_poll_clean(&state->events); | |
90936dcf JD |
277 | if (rotate_notification_channel) { |
278 | lttng_notification_channel_destroy(rotate_notification_channel); | |
279 | } | |
db66e574 JD |
280 | } |
281 | ||
282 | static | |
283 | int init_thread_state(struct rotation_thread_handle *handle, | |
92816cc3 | 284 | struct rotation_thread *state) |
db66e574 JD |
285 | { |
286 | int ret; | |
287 | ||
288 | memset(state, 0, sizeof(*state)); | |
289 | lttng_poll_init(&state->events); | |
290 | ||
291 | ret = init_poll_set(&state->events, handle); | |
292 | if (ret) { | |
293 | ERR("[rotation-thread] Failed to initialize rotation thread poll set"); | |
294 | goto end; | |
295 | } | |
296 | ||
90936dcf JD |
297 | rotate_notification_channel = lttng_notification_channel_create( |
298 | lttng_session_daemon_notification_endpoint); | |
299 | if (!rotate_notification_channel) { | |
300 | ERR("[rotation-thread] Could not create notification channel"); | |
301 | ret = -1; | |
302 | goto end; | |
303 | } | |
304 | ret = lttng_poll_add(&state->events, rotate_notification_channel->socket, | |
305 | LPOLLIN | LPOLLERR); | |
306 | if (ret < 0) { | |
307 | ERR("[rotation-thread] Failed to add notification fd to pollset"); | |
308 | goto end; | |
309 | } | |
310 | ||
db66e574 JD |
311 | end: |
312 | return ret; | |
313 | } | |
314 | ||
315 | static | |
d2956687 JG |
316 | void check_session_rotation_pending_on_consumers(struct ltt_session *session, |
317 | bool *_rotation_completed) | |
92816cc3 | 318 | { |
db582e11 | 319 | int ret = 0; |
92816cc3 JG |
320 | struct consumer_socket *socket; |
321 | struct cds_lfht_iter iter; | |
d2956687 JG |
322 | enum consumer_trace_chunk_exists_status exists_status; |
323 | uint64_t relayd_id; | |
324 | bool chunk_exists_on_peer = false; | |
325 | enum lttng_trace_chunk_status chunk_status; | |
326 | ||
327 | assert(session->chunk_being_archived); | |
92816cc3 JG |
328 | |
329 | /* | |
330 | * Check for a local pending rotation on all consumers (32-bit | |
331 | * user space, 64-bit user space, and kernel). | |
332 | */ | |
92816cc3 JG |
333 | rcu_read_lock(); |
334 | if (!session->ust_session) { | |
335 | goto skip_ust; | |
336 | } | |
337 | cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht, | |
338 | &iter, socket, node.node) { | |
d2956687 JG |
339 | relayd_id = session->ust_session->consumer->type == CONSUMER_DST_LOCAL ? |
340 | -1ULL : | |
341 | session->ust_session->consumer->net_seq_index; | |
342 | ||
343 | pthread_mutex_lock(socket->lock); | |
344 | ret = consumer_trace_chunk_exists(socket, | |
345 | relayd_id, | |
346 | session->id, session->chunk_being_archived, | |
347 | &exists_status); | |
348 | if (ret) { | |
349 | pthread_mutex_unlock(socket->lock); | |
83ed9e90 | 350 | ERR("Error occurred while checking rotation status on consumer daemon"); |
92816cc3 | 351 | goto end; |
db66e574 | 352 | } |
d2956687 | 353 | |
16100d7a | 354 | if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) { |
d2956687 JG |
355 | pthread_mutex_unlock(socket->lock); |
356 | chunk_exists_on_peer = true; | |
357 | goto end; | |
16100d7a | 358 | } |
d2956687 | 359 | pthread_mutex_unlock(socket->lock); |
16100d7a | 360 | } |
db66e574 | 361 | |
92816cc3 JG |
362 | skip_ust: |
363 | if (!session->kernel_session) { | |
364 | goto skip_kernel; | |
db66e574 | 365 | } |
92816cc3 JG |
366 | cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht, |
367 | &iter, socket, node.node) { | |
d2956687 JG |
368 | pthread_mutex_lock(socket->lock); |
369 | relayd_id = session->kernel_session->consumer->type == CONSUMER_DST_LOCAL ? | |
370 | -1ULL : | |
371 | session->kernel_session->consumer->net_seq_index; | |
372 | ||
373 | ret = consumer_trace_chunk_exists(socket, | |
374 | relayd_id, | |
375 | session->id, session->chunk_being_archived, | |
376 | &exists_status); | |
377 | if (ret) { | |
378 | pthread_mutex_unlock(socket->lock); | |
83ed9e90 | 379 | ERR("Error occurred while checking rotation status on consumer daemon"); |
92816cc3 JG |
380 | goto end; |
381 | } | |
d2956687 | 382 | |
16100d7a | 383 | if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) { |
d2956687 JG |
384 | pthread_mutex_unlock(socket->lock); |
385 | chunk_exists_on_peer = true; | |
386 | goto end; | |
16100d7a | 387 | } |
d2956687 | 388 | pthread_mutex_unlock(socket->lock); |
92816cc3 JG |
389 | } |
390 | skip_kernel: | |
391 | end: | |
392 | rcu_read_unlock(); | |
db66e574 | 393 | |
d2956687 JG |
394 | if (!chunk_exists_on_peer) { |
395 | uint64_t chunk_being_archived_id; | |
396 | ||
397 | chunk_status = lttng_trace_chunk_get_id( | |
398 | session->chunk_being_archived, | |
399 | &chunk_being_archived_id); | |
400 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
401 | DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers", | |
402 | chunk_being_archived_id, | |
92816cc3 | 403 | session->name); |
db66e574 | 404 | } |
d2956687 | 405 | *_rotation_completed = !chunk_exists_on_peer; |
92816cc3 | 406 | if (ret) { |
2961f09e JG |
407 | ret = session_reset_rotation_state(session, |
408 | LTTNG_ROTATION_STATE_ERROR); | |
409 | if (ret) { | |
410 | ERR("Failed to reset rotation state of session \"%s\"", | |
411 | session->name); | |
412 | } | |
db66e574 | 413 | } |
db66e574 JD |
414 | } |
415 | ||
d88744a4 | 416 | /* |
92816cc3 | 417 | * Check if the last rotation was completed, called with session lock held. |
d2956687 JG |
418 | * Should only return non-zero in the event of a fatal error. Doing so will |
419 | * shutdown the thread. | |
d88744a4 JD |
420 | */ |
421 | static | |
92816cc3 JG |
422 | int check_session_rotation_pending(struct ltt_session *session, |
423 | struct notification_thread_handle *notification_thread_handle) | |
d88744a4 JD |
424 | { |
425 | int ret; | |
92816cc3 | 426 | struct lttng_trace_archive_location *location; |
d2956687 JG |
427 | enum lttng_trace_chunk_status chunk_status; |
428 | bool rotation_completed = false; | |
429 | const char *archived_chunk_name; | |
430 | uint64_t chunk_being_archived_id; | |
431 | ||
dc1d5967 FD |
432 | if (!session->chunk_being_archived) { |
433 | ret = 0; | |
434 | goto end; | |
435 | } | |
436 | ||
d2956687 JG |
437 | chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived, |
438 | &chunk_being_archived_id); | |
439 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
d88744a4 | 440 | |
92816cc3 | 441 | DBG("[rotation-thread] Checking for pending rotation on session \"%s\", trace archive %" PRIu64, |
d2956687 JG |
442 | session->name, chunk_being_archived_id); |
443 | ||
faf1bdcf JG |
444 | /* |
445 | * The rotation-pending check timer of a session is launched in | |
446 | * one-shot mode. If the rotation is incomplete, the rotation | |
447 | * thread will re-enable the pending-check timer. | |
448 | * | |
449 | * The timer thread can't stop the timer itself since it is involved | |
450 | * in the check for the timer's quiescence. | |
451 | */ | |
452 | ret = timer_session_rotation_pending_check_stop(session); | |
453 | if (ret) { | |
6ae1bf46 | 454 | goto check_ongoing_rotation; |
faf1bdcf JG |
455 | } |
456 | ||
d2956687 JG |
457 | check_session_rotation_pending_on_consumers(session, |
458 | &rotation_completed); | |
d2956687 JG |
459 | if (!rotation_completed || |
460 | session->rotation_state == LTTNG_ROTATION_STATE_ERROR) { | |
6ae1bf46 | 461 | goto check_ongoing_rotation; |
92816cc3 JG |
462 | } |
463 | ||
92816cc3 JG |
464 | /* |
465 | * Now we can clear the "ONGOING" state in the session. New | |
466 | * rotations can start now. | |
467 | */ | |
d2956687 JG |
468 | chunk_status = lttng_trace_chunk_get_name(session->chunk_being_archived, |
469 | &archived_chunk_name, NULL); | |
470 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
471 | free(session->last_archived_chunk_name); | |
472 | session->last_archived_chunk_name = strdup(archived_chunk_name); | |
473 | if (!session->last_archived_chunk_name) { | |
474 | PERROR("Failed to duplicate archived chunk name"); | |
475 | } | |
476 | session_reset_rotation_state(session, LTTNG_ROTATION_STATE_COMPLETED); | |
92816cc3 | 477 | |
7fdbed1c JG |
478 | if (!session->quiet_rotation) { |
479 | location = session_get_trace_archive_location(session); | |
480 | /* Ownership of location is transferred. */ | |
481 | ret = notification_thread_command_session_rotation_completed( | |
482 | notification_thread_handle, | |
483 | session->name, | |
484 | session->uid, | |
485 | session->gid, | |
486 | session->last_archived_chunk_id.value, | |
487 | location); | |
488 | if (ret != LTTNG_OK) { | |
489 | ERR("[rotation-thread] Failed to notify notification thread of completed rotation for session %s", | |
490 | session->name); | |
491 | } | |
92816cc3 JG |
492 | } |
493 | ||
494 | ret = 0; | |
6ae1bf46 | 495 | check_ongoing_rotation: |
92816cc3 | 496 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
d2956687 JG |
497 | chunk_status = lttng_trace_chunk_get_id( |
498 | session->chunk_being_archived, | |
499 | &chunk_being_archived_id); | |
500 | assert(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); | |
501 | ||
92816cc3 | 502 | DBG("[rotation-thread] Rotation of trace archive %" PRIu64 " is still pending for session %s", |
d2956687 | 503 | chunk_being_archived_id, session->name); |
92816cc3 JG |
504 | ret = timer_session_rotation_pending_check_start(session, |
505 | DEFAULT_ROTATE_PENDING_TIMER); | |
506 | if (ret) { | |
d2956687 | 507 | ERR("Failed to re-enable rotation pending timer"); |
92816cc3 JG |
508 | ret = -1; |
509 | goto end; | |
510 | } | |
511 | } | |
512 | ||
6ae1bf46 | 513 | end: |
d88744a4 JD |
514 | return ret; |
515 | } | |
516 | ||
ed1e52a3 | 517 | /* Call with the session and session_list locks held. */ |
259c2674 | 518 | static |
92816cc3 | 519 | int launch_session_rotation(struct ltt_session *session) |
259c2674 JD |
520 | { |
521 | int ret; | |
92816cc3 | 522 | struct lttng_rotate_session_return rotation_return; |
259c2674 | 523 | |
92816cc3 JG |
524 | DBG("[rotation-thread] Launching scheduled time-based rotation on session \"%s\"", |
525 | session->name); | |
259c2674 | 526 | |
343defc2 MD |
527 | ret = cmd_rotate_session(session, &rotation_return, false, |
528 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
92816cc3 JG |
529 | if (ret == LTTNG_OK) { |
530 | DBG("[rotation-thread] Scheduled time-based rotation successfully launched on session \"%s\"", | |
531 | session->name); | |
532 | } else { | |
533 | /* Don't consider errors as fatal. */ | |
534 | DBG("[rotation-thread] Scheduled time-based rotation aborted for session %s: %s", | |
535 | session->name, lttng_strerror(ret)); | |
259c2674 | 536 | } |
92816cc3 JG |
537 | return 0; |
538 | } | |
259c2674 | 539 | |
92816cc3 JG |
540 | static |
541 | int run_job(struct rotation_thread_job *job, struct ltt_session *session, | |
542 | struct notification_thread_handle *notification_thread_handle) | |
543 | { | |
544 | int ret; | |
259c2674 | 545 | |
92816cc3 JG |
546 | switch (job->type) { |
547 | case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION: | |
16100d7a | 548 | ret = launch_session_rotation(session); |
92816cc3 JG |
549 | break; |
550 | case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION: | |
551 | ret = check_session_rotation_pending(session, | |
552 | notification_thread_handle); | |
553 | break; | |
554 | default: | |
555 | abort(); | |
259c2674 | 556 | } |
259c2674 JD |
557 | return ret; |
558 | } | |
559 | ||
d88744a4 | 560 | static |
92816cc3 JG |
561 | int handle_job_queue(struct rotation_thread_handle *handle, |
562 | struct rotation_thread *state, | |
d88744a4 JD |
563 | struct rotation_thread_timer_queue *queue) |
564 | { | |
565 | int ret = 0; | |
d88744a4 JD |
566 | |
567 | for (;;) { | |
e32d7f27 | 568 | struct ltt_session *session; |
92816cc3 | 569 | struct rotation_thread_job *job; |
d88744a4 | 570 | |
92816cc3 | 571 | /* Take the queue lock only to pop an element from the list. */ |
d88744a4 JD |
572 | pthread_mutex_lock(&queue->lock); |
573 | if (cds_list_empty(&queue->list)) { | |
574 | pthread_mutex_unlock(&queue->lock); | |
575 | break; | |
576 | } | |
92816cc3 JG |
577 | job = cds_list_first_entry(&queue->list, |
578 | typeof(*job), head); | |
579 | cds_list_del(&job->head); | |
d88744a4 JD |
580 | pthread_mutex_unlock(&queue->lock); |
581 | ||
d88744a4 | 582 | session_lock_list(); |
c7031a2c | 583 | session = job->session; |
d88744a4 | 584 | if (!session) { |
c7031a2c JG |
585 | DBG("[rotation-thread] Session \"%s\" not found", |
586 | session->name); | |
d88744a4 | 587 | /* |
92816cc3 JG |
588 | * This is a non-fatal error, and we cannot report it to |
589 | * the user (timer), so just print the error and | |
590 | * continue the processing. | |
591 | * | |
592 | * While the timer thread will purge pending signals for | |
593 | * a session on the session's destruction, it is | |
594 | * possible for a job targeting that session to have | |
595 | * already been queued before it was destroyed. | |
d88744a4 | 596 | */ |
92816cc3 | 597 | free(job); |
e32d7f27 | 598 | session_put(session); |
5b8139c6 | 599 | session_unlock_list(); |
d88744a4 JD |
600 | continue; |
601 | } | |
602 | ||
d88744a4 | 603 | session_lock(session); |
16100d7a | 604 | ret = run_job(job, session, handle->notification_thread_handle); |
d88744a4 | 605 | session_unlock(session); |
faf1bdcf | 606 | /* Release reference held by the job. */ |
e32d7f27 | 607 | session_put(session); |
ed1e52a3 | 608 | session_unlock_list(); |
92816cc3 | 609 | free(job); |
d88744a4 | 610 | if (ret) { |
d88744a4 JD |
611 | goto end; |
612 | } | |
613 | } | |
614 | ||
615 | ret = 0; | |
616 | ||
617 | end: | |
618 | return ret; | |
619 | } | |
620 | ||
92816cc3 JG |
621 | static |
622 | int handle_condition(const struct lttng_condition *condition, | |
90936dcf JD |
623 | const struct lttng_evaluation *evaluation, |
624 | struct notification_thread_handle *notification_thread_handle) | |
625 | { | |
626 | int ret = 0; | |
627 | const char *condition_session_name = NULL; | |
628 | enum lttng_condition_type condition_type; | |
629 | enum lttng_condition_status condition_status; | |
630 | enum lttng_evaluation_status evaluation_status; | |
631 | uint64_t consumed; | |
632 | struct ltt_session *session; | |
633 | ||
634 | condition_type = lttng_condition_get_type(condition); | |
635 | ||
636 | if (condition_type != LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE) { | |
637 | ret = -1; | |
638 | ERR("[rotation-thread] Condition type and session usage type are not the same"); | |
639 | goto end; | |
640 | } | |
641 | ||
642 | /* Fetch info to test */ | |
643 | condition_status = lttng_condition_session_consumed_size_get_session_name( | |
644 | condition, &condition_session_name); | |
645 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
646 | ERR("[rotation-thread] Session name could not be fetched"); | |
647 | ret = -1; | |
648 | goto end; | |
649 | } | |
650 | evaluation_status = lttng_evaluation_session_consumed_size_get_consumed_size(evaluation, | |
651 | &consumed); | |
652 | if (evaluation_status != LTTNG_EVALUATION_STATUS_OK) { | |
653 | ERR("[rotation-thread] Failed to get evaluation"); | |
654 | ret = -1; | |
655 | goto end; | |
656 | } | |
657 | ||
658 | session_lock_list(); | |
659 | session = session_find_by_name(condition_session_name); | |
660 | if (!session) { | |
661 | ret = -1; | |
662 | session_unlock_list(); | |
663 | ERR("[rotation-thread] Session \"%s\" not found", | |
664 | condition_session_name); | |
665 | goto end; | |
666 | } | |
667 | session_lock(session); | |
90936dcf JD |
668 | |
669 | ret = unsubscribe_session_consumed_size_rotation(session, | |
670 | notification_thread_handle); | |
671 | if (ret) { | |
490b3229 | 672 | goto end_unlock; |
90936dcf JD |
673 | } |
674 | ||
343defc2 MD |
675 | ret = cmd_rotate_session(session, NULL, false, |
676 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
90936dcf JD |
677 | if (ret == -LTTNG_ERR_ROTATION_PENDING) { |
678 | DBG("Rotate already pending, subscribe to the next threshold value"); | |
90936dcf JD |
679 | } else if (ret != LTTNG_OK) { |
680 | ERR("[rotation-thread] Failed to rotate on size notification with error: %s", | |
681 | lttng_strerror(ret)); | |
682 | ret = -1; | |
683 | goto end_unlock; | |
684 | } | |
685 | ret = subscribe_session_consumed_size_rotation(session, | |
686 | consumed + session->rotate_size, | |
687 | notification_thread_handle); | |
688 | if (ret) { | |
689 | ERR("[rotation-thread] Failed to subscribe to session consumed size condition"); | |
690 | goto end_unlock; | |
691 | } | |
692 | ret = 0; | |
693 | ||
694 | end_unlock: | |
695 | session_unlock(session); | |
e32d7f27 | 696 | session_put(session); |
5b8139c6 | 697 | session_unlock_list(); |
90936dcf JD |
698 | end: |
699 | return ret; | |
700 | } | |
701 | ||
702 | static | |
92816cc3 | 703 | int handle_notification_channel(int fd, |
90936dcf | 704 | struct rotation_thread_handle *handle, |
92816cc3 | 705 | struct rotation_thread *state) |
90936dcf JD |
706 | { |
707 | int ret; | |
d73ee93f JG |
708 | bool notification_pending; |
709 | struct lttng_notification *notification = NULL; | |
90936dcf JD |
710 | enum lttng_notification_channel_status status; |
711 | const struct lttng_evaluation *notification_evaluation; | |
712 | const struct lttng_condition *notification_condition; | |
713 | ||
d73ee93f JG |
714 | status = lttng_notification_channel_has_pending_notification( |
715 | rotate_notification_channel, ¬ification_pending); | |
716 | if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { | |
e275709f | 717 | ERR("[rotation-thread] Error occurred while checking for pending notification"); |
d73ee93f JG |
718 | ret = -1; |
719 | goto end; | |
720 | } | |
721 | ||
722 | if (!notification_pending) { | |
723 | ret = 0; | |
724 | goto end; | |
725 | } | |
726 | ||
90936dcf JD |
727 | /* Receive the next notification. */ |
728 | status = lttng_notification_channel_get_next_notification( | |
729 | rotate_notification_channel, | |
730 | ¬ification); | |
731 | ||
732 | switch (status) { | |
733 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK: | |
734 | break; | |
735 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED: | |
736 | /* Not an error, we will wait for the next one */ | |
737 | ret = 0; | |
738 | goto end;; | |
739 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED: | |
740 | ERR("Notification channel was closed"); | |
741 | ret = -1; | |
742 | goto end; | |
743 | default: | |
744 | /* Unhandled conditions / errors. */ | |
745 | ERR("Unknown notification channel status"); | |
746 | ret = -1; | |
747 | goto end; | |
748 | } | |
749 | ||
750 | notification_condition = lttng_notification_get_condition(notification); | |
751 | notification_evaluation = lttng_notification_get_evaluation(notification); | |
752 | ||
753 | ret = handle_condition(notification_condition, notification_evaluation, | |
754 | handle->notification_thread_handle); | |
755 | ||
756 | end: | |
757 | lttng_notification_destroy(notification); | |
90936dcf JD |
758 | return ret; |
759 | } | |
760 | ||
2c0c9bbc | 761 | static |
db66e574 JD |
762 | void *thread_rotation(void *data) |
763 | { | |
764 | int ret; | |
765 | struct rotation_thread_handle *handle = data; | |
92816cc3 | 766 | struct rotation_thread thread; |
87380d40 | 767 | int queue_pipe_fd; |
db66e574 JD |
768 | |
769 | DBG("[rotation-thread] Started rotation thread"); | |
f620cc28 JG |
770 | rcu_register_thread(); |
771 | rcu_thread_online(); | |
412d7227 | 772 | health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); |
f620cc28 | 773 | health_code_update(); |
db66e574 JD |
774 | |
775 | if (!handle) { | |
776 | ERR("[rotation-thread] Invalid thread context provided"); | |
777 | goto end; | |
778 | } | |
779 | ||
87380d40 JR |
780 | queue_pipe_fd = lttng_pipe_get_readfd( |
781 | handle->rotation_timer_queue->event_pipe); | |
782 | ||
db66e574 | 783 | |
92816cc3 | 784 | ret = init_thread_state(handle, &thread); |
db66e574 | 785 | if (ret) { |
f5f8e5cd | 786 | goto error; |
db66e574 JD |
787 | } |
788 | ||
db66e574 JD |
789 | while (true) { |
790 | int fd_count, i; | |
791 | ||
792 | health_poll_entry(); | |
793 | DBG("[rotation-thread] Entering poll wait"); | |
92816cc3 | 794 | ret = lttng_poll_wait(&thread.events, -1); |
db66e574 JD |
795 | DBG("[rotation-thread] Poll wait returned (%i)", ret); |
796 | health_poll_exit(); | |
797 | if (ret < 0) { | |
798 | /* | |
799 | * Restart interrupted system call. | |
800 | */ | |
801 | if (errno == EINTR) { | |
802 | continue; | |
803 | } | |
804 | ERR("[rotation-thread] Error encountered during lttng_poll_wait (%i)", ret); | |
805 | goto error; | |
806 | } | |
807 | ||
808 | fd_count = ret; | |
809 | for (i = 0; i < fd_count; i++) { | |
92816cc3 JG |
810 | int fd = LTTNG_POLL_GETFD(&thread.events, i); |
811 | uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i); | |
db66e574 JD |
812 | |
813 | DBG("[rotation-thread] Handling fd (%i) activity (%u)", | |
814 | fd, revents); | |
815 | ||
92816cc3 JG |
816 | if (revents & LPOLLERR) { |
817 | ERR("[rotation-thread] Polling returned an error on fd %i", fd); | |
818 | goto error; | |
819 | } | |
820 | ||
85e17b27 JG |
821 | if (fd == rotate_notification_channel->socket) { |
822 | ret = handle_notification_channel(fd, handle, | |
823 | &thread); | |
824 | if (ret) { | |
825 | ERR("[rotation-thread] Error occurred while handling activity on notification channel socket"); | |
826 | goto error; | |
827 | } | |
828 | } else { | |
829 | /* Job queue or quit pipe activity. */ | |
85e17b27 JG |
830 | |
831 | /* | |
832 | * The job queue is serviced if there is | |
833 | * activity on the quit pipe to ensure it is | |
834 | * flushed and all references held in the queue | |
835 | * are released. | |
836 | */ | |
92816cc3 JG |
837 | ret = handle_job_queue(handle, &thread, |
838 | handle->rotation_timer_queue); | |
d88744a4 JD |
839 | if (ret) { |
840 | ERR("[rotation-thread] Failed to handle rotation timer pipe event"); | |
841 | goto error; | |
842 | } | |
85e17b27 | 843 | |
64d9b072 JG |
844 | if (fd == queue_pipe_fd) { |
845 | char buf; | |
846 | ||
847 | ret = lttng_read(fd, &buf, 1); | |
848 | if (ret != 1) { | |
849 | ERR("[rotation-thread] Failed to read from wakeup pipe (fd = %i)", fd); | |
64d9b072 JG |
850 | goto error; |
851 | } | |
852 | } else { | |
85e17b27 JG |
853 | DBG("[rotation-thread] Quit pipe activity"); |
854 | goto exit; | |
90936dcf | 855 | } |
db66e574 JD |
856 | } |
857 | } | |
858 | } | |
859 | exit: | |
860 | error: | |
861 | DBG("[rotation-thread] Exit"); | |
92816cc3 | 862 | fini_thread_state(&thread); |
f620cc28 | 863 | end: |
412d7227 | 864 | health_unregister(the_health_sessiond); |
03732c32 JG |
865 | rcu_thread_offline(); |
866 | rcu_unregister_thread(); | |
db66e574 JD |
867 | return NULL; |
868 | } | |
64d9b072 JG |
869 | |
870 | static | |
871 | bool shutdown_rotation_thread(void *thread_data) | |
872 | { | |
873 | struct rotation_thread_handle *handle = thread_data; | |
874 | const int write_fd = lttng_pipe_get_writefd(handle->quit_pipe); | |
875 | ||
876 | return notify_thread_pipe(write_fd) == 1; | |
877 | } | |
878 | ||
879 | bool launch_rotation_thread(struct rotation_thread_handle *handle) | |
880 | { | |
881 | struct lttng_thread *thread; | |
882 | ||
883 | thread = lttng_thread_create("Rotation", | |
884 | thread_rotation, | |
885 | shutdown_rotation_thread, | |
886 | NULL, | |
887 | handle); | |
888 | if (!thread) { | |
889 | goto error; | |
890 | } | |
891 | lttng_thread_put(thread); | |
892 | return true; | |
893 | error: | |
894 | return false; | |
895 | } |