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> | |
c9e313bc SM |
11 | #include <common/error.hpp> |
12 | #include <common/config/session-config.hpp> | |
13 | #include <common/defaults.hpp> | |
14 | #include <common/utils.hpp> | |
15 | #include <common/futex.hpp> | |
16 | #include <common/align.hpp> | |
17 | #include <common/time.hpp> | |
18 | #include <common/hashtable/utils.hpp> | |
db66e574 JD |
19 | #include <sys/stat.h> |
20 | #include <time.h> | |
21 | #include <signal.h> | |
22 | #include <inttypes.h> | |
23 | ||
c9e313bc SM |
24 | #include <common/kernel-ctl/kernel-ctl.hpp> |
25 | #include <lttng/notification/channel-internal.hpp> | |
26 | #include <lttng/rotate-internal.hpp> | |
27 | #include <lttng/location-internal.hpp> | |
28 | #include <lttng/condition/condition-internal.hpp> | |
db66e574 | 29 | |
c9e313bc SM |
30 | #include "rotation-thread.hpp" |
31 | #include "lttng-sessiond.hpp" | |
32 | #include "health-sessiond.hpp" | |
33 | #include "rotate.hpp" | |
34 | #include "cmd.hpp" | |
35 | #include "session.hpp" | |
36 | #include "timer.hpp" | |
37 | #include "notification-thread-commands.hpp" | |
38 | #include "utils.hpp" | |
39 | #include "thread.hpp" | |
db66e574 JD |
40 | |
41 | #include <urcu.h> | |
42 | #include <urcu/list.h> | |
db66e574 | 43 | |
90936dcf JD |
44 | struct lttng_notification_channel *rotate_notification_channel = NULL; |
45 | ||
92816cc3 | 46 | struct rotation_thread { |
db66e574 JD |
47 | struct lttng_poll_event events; |
48 | }; | |
49 | ||
92816cc3 JG |
50 | struct rotation_thread_job { |
51 | enum rotation_thread_job_type type; | |
c7031a2c | 52 | struct ltt_session *session; |
92816cc3 JG |
53 | /* List member in struct rotation_thread_timer_queue. */ |
54 | struct cds_list_head head; | |
55 | }; | |
56 | ||
57 | /* | |
58 | * The timer thread enqueues jobs and wakes up the rotation thread. | |
59 | * When the rotation thread wakes up, it empties the queue. | |
60 | */ | |
61 | struct rotation_thread_timer_queue { | |
62 | struct lttng_pipe *event_pipe; | |
63 | struct cds_list_head list; | |
64 | pthread_mutex_t lock; | |
65 | }; | |
66 | ||
67 | struct rotation_thread_handle { | |
92816cc3 JG |
68 | struct rotation_thread_timer_queue *rotation_timer_queue; |
69 | /* Access to the notification thread cmd_queue */ | |
70 | struct notification_thread_handle *notification_thread_handle; | |
64d9b072 JG |
71 | /* Thread-specific quit pipe. */ |
72 | struct lttng_pipe *quit_pipe; | |
92816cc3 JG |
73 | }; |
74 | ||
db66e574 | 75 | static |
92816cc3 | 76 | const char *get_job_type_str(enum rotation_thread_job_type job_type) |
db66e574 | 77 | { |
92816cc3 JG |
78 | switch (job_type) { |
79 | case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION: | |
80 | return "CHECK_PENDING_ROTATION"; | |
81 | case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION: | |
82 | return "SCHEDULED_ROTATION"; | |
83 | default: | |
84 | abort(); | |
85 | } | |
db66e574 JD |
86 | } |
87 | ||
92816cc3 | 88 | struct rotation_thread_timer_queue *rotation_thread_timer_queue_create(void) |
db66e574 | 89 | { |
92816cc3 | 90 | struct rotation_thread_timer_queue *queue = NULL; |
db66e574 | 91 | |
64803277 | 92 | queue = zmalloc<rotation_thread_timer_queue>(); |
92816cc3 JG |
93 | if (!queue) { |
94 | PERROR("Failed to allocate timer rotate queue"); | |
95 | goto end; | |
96 | } | |
db66e574 | 97 | |
92816cc3 JG |
98 | queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK); |
99 | CDS_INIT_LIST_HEAD(&queue->list); | |
100 | pthread_mutex_init(&queue->lock, NULL); | |
101 | end: | |
102 | return queue; | |
db66e574 JD |
103 | } |
104 | ||
92816cc3 JG |
105 | void rotation_thread_timer_queue_destroy( |
106 | struct rotation_thread_timer_queue *queue) | |
db66e574 | 107 | { |
92816cc3 JG |
108 | if (!queue) { |
109 | return; | |
db66e574 JD |
110 | } |
111 | ||
92816cc3 JG |
112 | lttng_pipe_destroy(queue->event_pipe); |
113 | ||
114 | pthread_mutex_lock(&queue->lock); | |
a0377dfe | 115 | LTTNG_ASSERT(cds_list_empty(&queue->list)); |
92816cc3 JG |
116 | pthread_mutex_unlock(&queue->lock); |
117 | pthread_mutex_destroy(&queue->lock); | |
118 | free(queue); | |
119 | } | |
db66e574 | 120 | |
92816cc3 JG |
121 | /* |
122 | * Destroy the thread data previously created by the init function. | |
123 | */ | |
124 | void rotation_thread_handle_destroy( | |
125 | struct rotation_thread_handle *handle) | |
126 | { | |
64d9b072 | 127 | lttng_pipe_destroy(handle->quit_pipe); |
db66e574 JD |
128 | free(handle); |
129 | } | |
130 | ||
131 | struct rotation_thread_handle *rotation_thread_handle_create( | |
90936dcf | 132 | struct rotation_thread_timer_queue *rotation_timer_queue, |
c8a9de5a | 133 | struct notification_thread_handle *notification_thread_handle) |
db66e574 JD |
134 | { |
135 | struct rotation_thread_handle *handle; | |
136 | ||
64803277 | 137 | handle = zmalloc<rotation_thread_handle>(); |
db66e574 JD |
138 | if (!handle) { |
139 | goto end; | |
140 | } | |
141 | ||
92816cc3 JG |
142 | handle->rotation_timer_queue = rotation_timer_queue; |
143 | handle->notification_thread_handle = notification_thread_handle; | |
64d9b072 JG |
144 | handle->quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
145 | if (!handle->quit_pipe) { | |
146 | goto error; | |
147 | } | |
92816cc3 JG |
148 | |
149 | end: | |
150 | return handle; | |
64d9b072 JG |
151 | error: |
152 | rotation_thread_handle_destroy(handle); | |
153 | return NULL; | |
92816cc3 JG |
154 | } |
155 | ||
156 | /* | |
157 | * Called with the rotation_thread_timer_queue lock held. | |
158 | * Return true if the same timer job already exists in the queue, false if not. | |
159 | */ | |
160 | static | |
161 | bool timer_job_exists(const struct rotation_thread_timer_queue *queue, | |
c7031a2c JG |
162 | enum rotation_thread_job_type job_type, |
163 | struct ltt_session *session) | |
92816cc3 JG |
164 | { |
165 | bool exists = false; | |
166 | struct rotation_thread_job *job; | |
167 | ||
168 | cds_list_for_each_entry(job, &queue->list, head) { | |
c7031a2c | 169 | if (job->session == session && job->type == job_type) { |
92816cc3 JG |
170 | exists = true; |
171 | goto end; | |
db66e574 | 172 | } |
db66e574 | 173 | } |
92816cc3 JG |
174 | end: |
175 | return exists; | |
176 | } | |
177 | ||
178 | void rotation_thread_enqueue_job(struct rotation_thread_timer_queue *queue, | |
c7031a2c JG |
179 | enum rotation_thread_job_type job_type, |
180 | struct ltt_session *session) | |
92816cc3 JG |
181 | { |
182 | int ret; | |
be2956e7 | 183 | const char dummy = '!'; |
92816cc3 JG |
184 | struct rotation_thread_job *job = NULL; |
185 | const char *job_type_str = get_job_type_str(job_type); | |
186 | ||
187 | pthread_mutex_lock(&queue->lock); | |
c7031a2c | 188 | if (timer_job_exists(queue, job_type, session)) { |
92816cc3 JG |
189 | /* |
190 | * This timer job is already pending, we don't need to add | |
191 | * it. | |
192 | */ | |
193 | goto end; | |
db66e574 | 194 | } |
92816cc3 | 195 | |
64803277 | 196 | job = zmalloc<rotation_thread_job>(); |
92816cc3 | 197 | if (!job) { |
c7031a2c JG |
198 | PERROR("Failed to allocate rotation thread job of type \"%s\" for session \"%s\"", |
199 | job_type_str, session->name); | |
92816cc3 JG |
200 | goto end; |
201 | } | |
c7031a2c JG |
202 | /* No reason for this to fail as the caller must hold a reference. */ |
203 | (void) session_get(session); | |
204 | ||
205 | job->session = session; | |
92816cc3 | 206 | job->type = job_type; |
92816cc3 JG |
207 | cds_list_add_tail(&job->head, &queue->list); |
208 | ||
be2956e7 JG |
209 | ret = lttng_write(lttng_pipe_get_writefd(queue->event_pipe), &dummy, |
210 | sizeof(dummy)); | |
92816cc3 JG |
211 | if (ret < 0) { |
212 | /* | |
213 | * We do not want to block in the timer handler, the job has | |
214 | * been enqueued in the list, the wakeup pipe is probably full, | |
215 | * the job will be processed when the rotation_thread catches | |
216 | * up. | |
217 | */ | |
942003e5 MJ |
218 | DIAGNOSTIC_PUSH |
219 | DIAGNOSTIC_IGNORE_LOGICAL_OP | |
92816cc3 | 220 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
942003e5 | 221 | DIAGNOSTIC_POP |
92816cc3 JG |
222 | /* |
223 | * Not an error, but would be surprising and indicate | |
224 | * that the rotation thread can't keep up with the | |
225 | * current load. | |
226 | */ | |
227 | DBG("Wake-up pipe of rotation thread job queue is full"); | |
228 | goto end; | |
db66e574 | 229 | } |
c7031a2c JG |
230 | PERROR("Failed to wake-up the rotation thread after pushing a job of type \"%s\" for session \"%s\"", |
231 | job_type_str, session->name); | |
92816cc3 | 232 | goto end; |
db66e574 | 233 | } |
db66e574 JD |
234 | |
235 | end: | |
92816cc3 | 236 | pthread_mutex_unlock(&queue->lock); |
db66e574 JD |
237 | } |
238 | ||
239 | static | |
240 | int init_poll_set(struct lttng_poll_event *poll_set, | |
241 | struct rotation_thread_handle *handle) | |
242 | { | |
243 | int ret; | |
244 | ||
245 | /* | |
64d9b072 JG |
246 | * Create pollset with size 3: |
247 | * - rotation thread quit pipe, | |
92816cc3 | 248 | * - rotation thread timer queue pipe, |
64d9b072 | 249 | * - notification channel sock, |
db66e574 | 250 | */ |
64d9b072 JG |
251 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); |
252 | if (ret < 0) { | |
db66e574 JD |
253 | goto error; |
254 | } | |
64d9b072 JG |
255 | |
256 | ret = lttng_poll_add(poll_set, | |
257 | lttng_pipe_get_readfd(handle->quit_pipe), | |
258 | LPOLLIN | LPOLLERR); | |
259 | if (ret < 0) { | |
bd0514a5 | 260 | ERR("Failed to add quit pipe read fd to poll set"); |
64d9b072 JG |
261 | goto error; |
262 | } | |
263 | ||
d086f507 JD |
264 | ret = lttng_poll_add(poll_set, |
265 | lttng_pipe_get_readfd(handle->rotation_timer_queue->event_pipe), | |
266 | LPOLLIN | LPOLLERR); | |
267 | if (ret < 0) { | |
bd0514a5 | 268 | ERR("Failed to add rotate_pending fd to poll set"); |
d086f507 JD |
269 | goto error; |
270 | } | |
db66e574 | 271 | |
db66e574 JD |
272 | return ret; |
273 | error: | |
274 | lttng_poll_clean(poll_set); | |
275 | return ret; | |
276 | } | |
277 | ||
278 | static | |
92816cc3 | 279 | void fini_thread_state(struct rotation_thread *state) |
db66e574 JD |
280 | { |
281 | lttng_poll_clean(&state->events); | |
90936dcf JD |
282 | if (rotate_notification_channel) { |
283 | lttng_notification_channel_destroy(rotate_notification_channel); | |
284 | } | |
db66e574 JD |
285 | } |
286 | ||
287 | static | |
288 | int init_thread_state(struct rotation_thread_handle *handle, | |
92816cc3 | 289 | struct rotation_thread *state) |
db66e574 JD |
290 | { |
291 | int ret; | |
292 | ||
293 | memset(state, 0, sizeof(*state)); | |
294 | lttng_poll_init(&state->events); | |
295 | ||
296 | ret = init_poll_set(&state->events, handle); | |
297 | if (ret) { | |
bd0514a5 | 298 | ERR("Failed to initialize rotation thread poll set"); |
db66e574 JD |
299 | goto end; |
300 | } | |
301 | ||
90936dcf JD |
302 | rotate_notification_channel = lttng_notification_channel_create( |
303 | lttng_session_daemon_notification_endpoint); | |
304 | if (!rotate_notification_channel) { | |
bd0514a5 | 305 | ERR("Could not create notification channel"); |
90936dcf JD |
306 | ret = -1; |
307 | goto end; | |
308 | } | |
309 | ret = lttng_poll_add(&state->events, rotate_notification_channel->socket, | |
310 | LPOLLIN | LPOLLERR); | |
311 | if (ret < 0) { | |
bd0514a5 | 312 | ERR("Failed to add notification fd to pollset"); |
90936dcf JD |
313 | goto end; |
314 | } | |
315 | ||
db66e574 JD |
316 | end: |
317 | return ret; | |
318 | } | |
319 | ||
320 | static | |
d2956687 JG |
321 | void check_session_rotation_pending_on_consumers(struct ltt_session *session, |
322 | bool *_rotation_completed) | |
92816cc3 | 323 | { |
db582e11 | 324 | int ret = 0; |
92816cc3 JG |
325 | struct consumer_socket *socket; |
326 | struct cds_lfht_iter iter; | |
d2956687 JG |
327 | enum consumer_trace_chunk_exists_status exists_status; |
328 | uint64_t relayd_id; | |
329 | bool chunk_exists_on_peer = false; | |
330 | enum lttng_trace_chunk_status chunk_status; | |
331 | ||
a0377dfe | 332 | LTTNG_ASSERT(session->chunk_being_archived); |
92816cc3 JG |
333 | |
334 | /* | |
335 | * Check for a local pending rotation on all consumers (32-bit | |
336 | * user space, 64-bit user space, and kernel). | |
337 | */ | |
92816cc3 JG |
338 | rcu_read_lock(); |
339 | if (!session->ust_session) { | |
340 | goto skip_ust; | |
341 | } | |
342 | cds_lfht_for_each_entry(session->ust_session->consumer->socks->ht, | |
343 | &iter, socket, node.node) { | |
d2956687 JG |
344 | relayd_id = session->ust_session->consumer->type == CONSUMER_DST_LOCAL ? |
345 | -1ULL : | |
346 | session->ust_session->consumer->net_seq_index; | |
347 | ||
348 | pthread_mutex_lock(socket->lock); | |
349 | ret = consumer_trace_chunk_exists(socket, | |
350 | relayd_id, | |
351 | session->id, session->chunk_being_archived, | |
352 | &exists_status); | |
353 | if (ret) { | |
354 | pthread_mutex_unlock(socket->lock); | |
83ed9e90 | 355 | ERR("Error occurred while checking rotation status on consumer daemon"); |
92816cc3 | 356 | goto end; |
db66e574 | 357 | } |
d2956687 | 358 | |
16100d7a | 359 | if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) { |
d2956687 JG |
360 | pthread_mutex_unlock(socket->lock); |
361 | chunk_exists_on_peer = true; | |
362 | goto end; | |
16100d7a | 363 | } |
d2956687 | 364 | pthread_mutex_unlock(socket->lock); |
16100d7a | 365 | } |
db66e574 | 366 | |
92816cc3 JG |
367 | skip_ust: |
368 | if (!session->kernel_session) { | |
369 | goto skip_kernel; | |
db66e574 | 370 | } |
92816cc3 JG |
371 | cds_lfht_for_each_entry(session->kernel_session->consumer->socks->ht, |
372 | &iter, socket, node.node) { | |
d2956687 JG |
373 | pthread_mutex_lock(socket->lock); |
374 | relayd_id = session->kernel_session->consumer->type == CONSUMER_DST_LOCAL ? | |
375 | -1ULL : | |
376 | session->kernel_session->consumer->net_seq_index; | |
377 | ||
378 | ret = consumer_trace_chunk_exists(socket, | |
379 | relayd_id, | |
380 | session->id, session->chunk_being_archived, | |
381 | &exists_status); | |
382 | if (ret) { | |
383 | pthread_mutex_unlock(socket->lock); | |
83ed9e90 | 384 | ERR("Error occurred while checking rotation status on consumer daemon"); |
92816cc3 JG |
385 | goto end; |
386 | } | |
d2956687 | 387 | |
16100d7a | 388 | if (exists_status != CONSUMER_TRACE_CHUNK_EXISTS_STATUS_UNKNOWN_CHUNK) { |
d2956687 JG |
389 | pthread_mutex_unlock(socket->lock); |
390 | chunk_exists_on_peer = true; | |
391 | goto end; | |
16100d7a | 392 | } |
d2956687 | 393 | pthread_mutex_unlock(socket->lock); |
92816cc3 JG |
394 | } |
395 | skip_kernel: | |
396 | end: | |
397 | rcu_read_unlock(); | |
db66e574 | 398 | |
d2956687 JG |
399 | if (!chunk_exists_on_peer) { |
400 | uint64_t chunk_being_archived_id; | |
401 | ||
402 | chunk_status = lttng_trace_chunk_get_id( | |
403 | session->chunk_being_archived, | |
404 | &chunk_being_archived_id); | |
a0377dfe | 405 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
bd0514a5 | 406 | DBG("Rotation of trace archive %" PRIu64 " of session \"%s\" is complete on all consumers", |
d2956687 | 407 | chunk_being_archived_id, |
92816cc3 | 408 | session->name); |
db66e574 | 409 | } |
d2956687 | 410 | *_rotation_completed = !chunk_exists_on_peer; |
92816cc3 | 411 | if (ret) { |
2961f09e JG |
412 | ret = session_reset_rotation_state(session, |
413 | LTTNG_ROTATION_STATE_ERROR); | |
414 | if (ret) { | |
415 | ERR("Failed to reset rotation state of session \"%s\"", | |
416 | session->name); | |
417 | } | |
db66e574 | 418 | } |
db66e574 JD |
419 | } |
420 | ||
d88744a4 | 421 | /* |
92816cc3 | 422 | * Check if the last rotation was completed, called with session lock held. |
d2956687 JG |
423 | * Should only return non-zero in the event of a fatal error. Doing so will |
424 | * shutdown the thread. | |
d88744a4 JD |
425 | */ |
426 | static | |
92816cc3 JG |
427 | int check_session_rotation_pending(struct ltt_session *session, |
428 | struct notification_thread_handle *notification_thread_handle) | |
d88744a4 JD |
429 | { |
430 | int ret; | |
92816cc3 | 431 | struct lttng_trace_archive_location *location; |
d2956687 JG |
432 | enum lttng_trace_chunk_status chunk_status; |
433 | bool rotation_completed = false; | |
434 | const char *archived_chunk_name; | |
435 | uint64_t chunk_being_archived_id; | |
436 | ||
dc1d5967 FD |
437 | if (!session->chunk_being_archived) { |
438 | ret = 0; | |
439 | goto end; | |
440 | } | |
441 | ||
d2956687 JG |
442 | chunk_status = lttng_trace_chunk_get_id(session->chunk_being_archived, |
443 | &chunk_being_archived_id); | |
a0377dfe | 444 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
d88744a4 | 445 | |
bd0514a5 | 446 | DBG("Checking for pending rotation on session \"%s\", trace archive %" PRIu64, |
d2956687 JG |
447 | session->name, chunk_being_archived_id); |
448 | ||
faf1bdcf JG |
449 | /* |
450 | * The rotation-pending check timer of a session is launched in | |
451 | * one-shot mode. If the rotation is incomplete, the rotation | |
452 | * thread will re-enable the pending-check timer. | |
453 | * | |
454 | * The timer thread can't stop the timer itself since it is involved | |
455 | * in the check for the timer's quiescence. | |
456 | */ | |
457 | ret = timer_session_rotation_pending_check_stop(session); | |
458 | if (ret) { | |
6ae1bf46 | 459 | goto check_ongoing_rotation; |
faf1bdcf JG |
460 | } |
461 | ||
d2956687 JG |
462 | check_session_rotation_pending_on_consumers(session, |
463 | &rotation_completed); | |
d2956687 JG |
464 | if (!rotation_completed || |
465 | session->rotation_state == LTTNG_ROTATION_STATE_ERROR) { | |
6ae1bf46 | 466 | goto check_ongoing_rotation; |
92816cc3 JG |
467 | } |
468 | ||
92816cc3 JG |
469 | /* |
470 | * Now we can clear the "ONGOING" state in the session. New | |
471 | * rotations can start now. | |
472 | */ | |
d2956687 JG |
473 | chunk_status = lttng_trace_chunk_get_name(session->chunk_being_archived, |
474 | &archived_chunk_name, NULL); | |
a0377dfe | 475 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
d2956687 JG |
476 | free(session->last_archived_chunk_name); |
477 | session->last_archived_chunk_name = strdup(archived_chunk_name); | |
478 | if (!session->last_archived_chunk_name) { | |
479 | PERROR("Failed to duplicate archived chunk name"); | |
480 | } | |
481 | session_reset_rotation_state(session, LTTNG_ROTATION_STATE_COMPLETED); | |
92816cc3 | 482 | |
7fdbed1c JG |
483 | if (!session->quiet_rotation) { |
484 | location = session_get_trace_archive_location(session); | |
7fdbed1c JG |
485 | ret = notification_thread_command_session_rotation_completed( |
486 | notification_thread_handle, | |
487 | session->name, | |
488 | session->uid, | |
489 | session->gid, | |
490 | session->last_archived_chunk_id.value, | |
491 | location); | |
d3740619 | 492 | lttng_trace_archive_location_put(location); |
7fdbed1c | 493 | if (ret != LTTNG_OK) { |
bd0514a5 | 494 | ERR("Failed to notify notification thread of completed rotation for session %s", |
7fdbed1c JG |
495 | session->name); |
496 | } | |
92816cc3 JG |
497 | } |
498 | ||
499 | ret = 0; | |
6ae1bf46 | 500 | check_ongoing_rotation: |
92816cc3 | 501 | if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING) { |
d2956687 JG |
502 | chunk_status = lttng_trace_chunk_get_id( |
503 | session->chunk_being_archived, | |
504 | &chunk_being_archived_id); | |
a0377dfe | 505 | LTTNG_ASSERT(chunk_status == LTTNG_TRACE_CHUNK_STATUS_OK); |
d2956687 | 506 | |
bd0514a5 | 507 | DBG("Rotation of trace archive %" PRIu64 " is still pending for session %s", |
d2956687 | 508 | chunk_being_archived_id, session->name); |
92816cc3 JG |
509 | ret = timer_session_rotation_pending_check_start(session, |
510 | DEFAULT_ROTATE_PENDING_TIMER); | |
511 | if (ret) { | |
d2956687 | 512 | ERR("Failed to re-enable rotation pending timer"); |
92816cc3 JG |
513 | ret = -1; |
514 | goto end; | |
515 | } | |
516 | } | |
517 | ||
6ae1bf46 | 518 | end: |
d88744a4 JD |
519 | return ret; |
520 | } | |
521 | ||
ed1e52a3 | 522 | /* Call with the session and session_list locks held. */ |
259c2674 | 523 | static |
92816cc3 | 524 | int launch_session_rotation(struct ltt_session *session) |
259c2674 JD |
525 | { |
526 | int ret; | |
92816cc3 | 527 | struct lttng_rotate_session_return rotation_return; |
259c2674 | 528 | |
bd0514a5 | 529 | DBG("Launching scheduled time-based rotation on session \"%s\"", |
92816cc3 | 530 | session->name); |
259c2674 | 531 | |
343defc2 MD |
532 | ret = cmd_rotate_session(session, &rotation_return, false, |
533 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
92816cc3 | 534 | if (ret == LTTNG_OK) { |
bd0514a5 | 535 | DBG("Scheduled time-based rotation successfully launched on session \"%s\"", |
92816cc3 JG |
536 | session->name); |
537 | } else { | |
538 | /* Don't consider errors as fatal. */ | |
bd0514a5 | 539 | DBG("Scheduled time-based rotation aborted for session %s: %s", |
92816cc3 | 540 | session->name, lttng_strerror(ret)); |
259c2674 | 541 | } |
92816cc3 JG |
542 | return 0; |
543 | } | |
259c2674 | 544 | |
92816cc3 JG |
545 | static |
546 | int run_job(struct rotation_thread_job *job, struct ltt_session *session, | |
547 | struct notification_thread_handle *notification_thread_handle) | |
548 | { | |
549 | int ret; | |
259c2674 | 550 | |
92816cc3 JG |
551 | switch (job->type) { |
552 | case ROTATION_THREAD_JOB_TYPE_SCHEDULED_ROTATION: | |
16100d7a | 553 | ret = launch_session_rotation(session); |
92816cc3 JG |
554 | break; |
555 | case ROTATION_THREAD_JOB_TYPE_CHECK_PENDING_ROTATION: | |
556 | ret = check_session_rotation_pending(session, | |
557 | notification_thread_handle); | |
558 | break; | |
559 | default: | |
560 | abort(); | |
259c2674 | 561 | } |
259c2674 JD |
562 | return ret; |
563 | } | |
564 | ||
d88744a4 | 565 | static |
92816cc3 | 566 | int handle_job_queue(struct rotation_thread_handle *handle, |
f46376a1 | 567 | struct rotation_thread *state __attribute__((unused)), |
d88744a4 JD |
568 | struct rotation_thread_timer_queue *queue) |
569 | { | |
570 | int ret = 0; | |
d88744a4 JD |
571 | |
572 | for (;;) { | |
e32d7f27 | 573 | struct ltt_session *session; |
92816cc3 | 574 | struct rotation_thread_job *job; |
d88744a4 | 575 | |
92816cc3 | 576 | /* Take the queue lock only to pop an element from the list. */ |
d88744a4 JD |
577 | pthread_mutex_lock(&queue->lock); |
578 | if (cds_list_empty(&queue->list)) { | |
579 | pthread_mutex_unlock(&queue->lock); | |
580 | break; | |
581 | } | |
92816cc3 JG |
582 | job = cds_list_first_entry(&queue->list, |
583 | typeof(*job), head); | |
584 | cds_list_del(&job->head); | |
d88744a4 JD |
585 | pthread_mutex_unlock(&queue->lock); |
586 | ||
d88744a4 | 587 | session_lock_list(); |
c7031a2c | 588 | session = job->session; |
d88744a4 | 589 | if (!session) { |
bd0514a5 | 590 | DBG("Session \"%s\" not found", |
739b8e17 | 591 | session->name != NULL ? session->name : ""); |
d88744a4 | 592 | /* |
92816cc3 JG |
593 | * This is a non-fatal error, and we cannot report it to |
594 | * the user (timer), so just print the error and | |
595 | * continue the processing. | |
596 | * | |
597 | * While the timer thread will purge pending signals for | |
598 | * a session on the session's destruction, it is | |
599 | * possible for a job targeting that session to have | |
600 | * already been queued before it was destroyed. | |
d88744a4 | 601 | */ |
92816cc3 | 602 | free(job); |
e32d7f27 | 603 | session_put(session); |
5b8139c6 | 604 | session_unlock_list(); |
d88744a4 JD |
605 | continue; |
606 | } | |
607 | ||
d88744a4 | 608 | session_lock(session); |
16100d7a | 609 | ret = run_job(job, session, handle->notification_thread_handle); |
d88744a4 | 610 | session_unlock(session); |
faf1bdcf | 611 | /* Release reference held by the job. */ |
e32d7f27 | 612 | session_put(session); |
ed1e52a3 | 613 | session_unlock_list(); |
92816cc3 | 614 | free(job); |
d88744a4 | 615 | if (ret) { |
d88744a4 JD |
616 | goto end; |
617 | } | |
618 | } | |
619 | ||
620 | ret = 0; | |
621 | ||
622 | end: | |
623 | return ret; | |
624 | } | |
625 | ||
92816cc3 JG |
626 | static |
627 | int handle_condition(const struct lttng_condition *condition, | |
90936dcf JD |
628 | const struct lttng_evaluation *evaluation, |
629 | struct notification_thread_handle *notification_thread_handle) | |
630 | { | |
631 | int ret = 0; | |
632 | const char *condition_session_name = NULL; | |
633 | enum lttng_condition_type condition_type; | |
634 | enum lttng_condition_status condition_status; | |
635 | enum lttng_evaluation_status evaluation_status; | |
636 | uint64_t consumed; | |
637 | struct ltt_session *session; | |
638 | ||
639 | condition_type = lttng_condition_get_type(condition); | |
640 | ||
641 | if (condition_type != LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE) { | |
642 | ret = -1; | |
bd0514a5 | 643 | ERR("Condition type and session usage type are not the same"); |
90936dcf JD |
644 | goto end; |
645 | } | |
646 | ||
647 | /* Fetch info to test */ | |
648 | condition_status = lttng_condition_session_consumed_size_get_session_name( | |
649 | condition, &condition_session_name); | |
650 | if (condition_status != LTTNG_CONDITION_STATUS_OK) { | |
bd0514a5 | 651 | ERR("Session name could not be fetched"); |
90936dcf JD |
652 | ret = -1; |
653 | goto end; | |
654 | } | |
655 | evaluation_status = lttng_evaluation_session_consumed_size_get_consumed_size(evaluation, | |
656 | &consumed); | |
657 | if (evaluation_status != LTTNG_EVALUATION_STATUS_OK) { | |
bd0514a5 | 658 | ERR("Failed to get evaluation"); |
90936dcf JD |
659 | ret = -1; |
660 | goto end; | |
661 | } | |
662 | ||
663 | session_lock_list(); | |
664 | session = session_find_by_name(condition_session_name); | |
665 | if (!session) { | |
eb2827a4 JG |
666 | DBG("Failed to find session while handling notification: notification type = %s, session name = `%s`", |
667 | lttng_condition_type_str(condition_type), | |
90936dcf | 668 | condition_session_name); |
eb2827a4 JG |
669 | /* |
670 | * Not a fatal error: a session can be destroyed before we get | |
671 | * the chance to handle the notification. | |
672 | */ | |
673 | ret = 0; | |
674 | session_unlock_list(); | |
90936dcf JD |
675 | goto end; |
676 | } | |
677 | session_lock(session); | |
90936dcf JD |
678 | |
679 | ret = unsubscribe_session_consumed_size_rotation(session, | |
680 | notification_thread_handle); | |
681 | if (ret) { | |
490b3229 | 682 | goto end_unlock; |
90936dcf JD |
683 | } |
684 | ||
343defc2 MD |
685 | ret = cmd_rotate_session(session, NULL, false, |
686 | LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED); | |
90936dcf JD |
687 | if (ret == -LTTNG_ERR_ROTATION_PENDING) { |
688 | DBG("Rotate already pending, subscribe to the next threshold value"); | |
90936dcf | 689 | } else if (ret != LTTNG_OK) { |
bd0514a5 | 690 | ERR("Failed to rotate on size notification with error: %s", |
90936dcf JD |
691 | lttng_strerror(ret)); |
692 | ret = -1; | |
693 | goto end_unlock; | |
694 | } | |
695 | ret = subscribe_session_consumed_size_rotation(session, | |
696 | consumed + session->rotate_size, | |
697 | notification_thread_handle); | |
698 | if (ret) { | |
bd0514a5 | 699 | ERR("Failed to subscribe to session consumed size condition"); |
90936dcf JD |
700 | goto end_unlock; |
701 | } | |
702 | ret = 0; | |
703 | ||
704 | end_unlock: | |
705 | session_unlock(session); | |
e32d7f27 | 706 | session_put(session); |
5b8139c6 | 707 | session_unlock_list(); |
90936dcf JD |
708 | end: |
709 | return ret; | |
710 | } | |
711 | ||
712 | static | |
f46376a1 | 713 | int handle_notification_channel(int fd __attribute__((unused)), |
90936dcf | 714 | struct rotation_thread_handle *handle, |
f46376a1 | 715 | struct rotation_thread *state __attribute__((unused))) |
90936dcf JD |
716 | { |
717 | int ret; | |
d73ee93f JG |
718 | bool notification_pending; |
719 | struct lttng_notification *notification = NULL; | |
90936dcf JD |
720 | enum lttng_notification_channel_status status; |
721 | const struct lttng_evaluation *notification_evaluation; | |
722 | const struct lttng_condition *notification_condition; | |
723 | ||
d73ee93f JG |
724 | status = lttng_notification_channel_has_pending_notification( |
725 | rotate_notification_channel, ¬ification_pending); | |
726 | if (status != LTTNG_NOTIFICATION_CHANNEL_STATUS_OK) { | |
bd0514a5 | 727 | ERR("Error occurred while checking for pending notification"); |
d73ee93f JG |
728 | ret = -1; |
729 | goto end; | |
730 | } | |
731 | ||
732 | if (!notification_pending) { | |
733 | ret = 0; | |
734 | goto end; | |
735 | } | |
736 | ||
90936dcf JD |
737 | /* Receive the next notification. */ |
738 | status = lttng_notification_channel_get_next_notification( | |
739 | rotate_notification_channel, | |
740 | ¬ification); | |
741 | ||
742 | switch (status) { | |
743 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_OK: | |
744 | break; | |
745 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_NOTIFICATIONS_DROPPED: | |
746 | /* Not an error, we will wait for the next one */ | |
747 | ret = 0; | |
748 | goto end;; | |
749 | case LTTNG_NOTIFICATION_CHANNEL_STATUS_CLOSED: | |
750 | ERR("Notification channel was closed"); | |
751 | ret = -1; | |
752 | goto end; | |
753 | default: | |
754 | /* Unhandled conditions / errors. */ | |
755 | ERR("Unknown notification channel status"); | |
756 | ret = -1; | |
757 | goto end; | |
758 | } | |
759 | ||
760 | notification_condition = lttng_notification_get_condition(notification); | |
761 | notification_evaluation = lttng_notification_get_evaluation(notification); | |
762 | ||
763 | ret = handle_condition(notification_condition, notification_evaluation, | |
764 | handle->notification_thread_handle); | |
765 | ||
766 | end: | |
767 | lttng_notification_destroy(notification); | |
90936dcf JD |
768 | return ret; |
769 | } | |
770 | ||
2c0c9bbc | 771 | static |
db66e574 JD |
772 | void *thread_rotation(void *data) |
773 | { | |
774 | int ret; | |
7966af57 | 775 | struct rotation_thread_handle *handle = (rotation_thread_handle *) data; |
92816cc3 | 776 | struct rotation_thread thread; |
87380d40 | 777 | int queue_pipe_fd; |
db66e574 | 778 | |
bd0514a5 | 779 | DBG("Started rotation thread"); |
f620cc28 JG |
780 | rcu_register_thread(); |
781 | rcu_thread_online(); | |
412d7227 | 782 | health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_ROTATION); |
f620cc28 | 783 | health_code_update(); |
db66e574 JD |
784 | |
785 | if (!handle) { | |
bd0514a5 | 786 | ERR("Invalid thread context provided"); |
db66e574 JD |
787 | goto end; |
788 | } | |
789 | ||
87380d40 JR |
790 | queue_pipe_fd = lttng_pipe_get_readfd( |
791 | handle->rotation_timer_queue->event_pipe); | |
792 | ||
db66e574 | 793 | |
92816cc3 | 794 | ret = init_thread_state(handle, &thread); |
db66e574 | 795 | if (ret) { |
f5f8e5cd | 796 | goto error; |
db66e574 JD |
797 | } |
798 | ||
db66e574 JD |
799 | while (true) { |
800 | int fd_count, i; | |
801 | ||
802 | health_poll_entry(); | |
bd0514a5 | 803 | DBG("Entering poll wait"); |
92816cc3 | 804 | ret = lttng_poll_wait(&thread.events, -1); |
bd0514a5 | 805 | DBG("Poll wait returned (%i)", ret); |
db66e574 JD |
806 | health_poll_exit(); |
807 | if (ret < 0) { | |
808 | /* | |
809 | * Restart interrupted system call. | |
810 | */ | |
811 | if (errno == EINTR) { | |
812 | continue; | |
813 | } | |
bd0514a5 | 814 | ERR("Error encountered during lttng_poll_wait (%i)", ret); |
db66e574 JD |
815 | goto error; |
816 | } | |
817 | ||
818 | fd_count = ret; | |
819 | for (i = 0; i < fd_count; i++) { | |
92816cc3 JG |
820 | int fd = LTTNG_POLL_GETFD(&thread.events, i); |
821 | uint32_t revents = LTTNG_POLL_GETEV(&thread.events, i); | |
db66e574 | 822 | |
bd0514a5 | 823 | DBG("Handling fd (%i) activity (%u)", |
db66e574 JD |
824 | fd, revents); |
825 | ||
92816cc3 | 826 | if (revents & LPOLLERR) { |
bd0514a5 | 827 | ERR("Polling returned an error on fd %i", fd); |
92816cc3 JG |
828 | goto error; |
829 | } | |
830 | ||
85e17b27 JG |
831 | if (fd == rotate_notification_channel->socket) { |
832 | ret = handle_notification_channel(fd, handle, | |
833 | &thread); | |
834 | if (ret) { | |
bd0514a5 | 835 | ERR("Error occurred while handling activity on notification channel socket"); |
85e17b27 JG |
836 | goto error; |
837 | } | |
838 | } else { | |
839 | /* Job queue or quit pipe activity. */ | |
85e17b27 JG |
840 | |
841 | /* | |
842 | * The job queue is serviced if there is | |
843 | * activity on the quit pipe to ensure it is | |
844 | * flushed and all references held in the queue | |
845 | * are released. | |
846 | */ | |
92816cc3 JG |
847 | ret = handle_job_queue(handle, &thread, |
848 | handle->rotation_timer_queue); | |
d88744a4 | 849 | if (ret) { |
bd0514a5 | 850 | ERR("Failed to handle rotation timer pipe event"); |
d88744a4 JD |
851 | goto error; |
852 | } | |
85e17b27 | 853 | |
64d9b072 JG |
854 | if (fd == queue_pipe_fd) { |
855 | char buf; | |
856 | ||
857 | ret = lttng_read(fd, &buf, 1); | |
858 | if (ret != 1) { | |
bd0514a5 | 859 | ERR("Failed to read from wakeup pipe (fd = %i)", fd); |
64d9b072 JG |
860 | goto error; |
861 | } | |
862 | } else { | |
bd0514a5 | 863 | DBG("Quit pipe activity"); |
85e17b27 | 864 | goto exit; |
90936dcf | 865 | } |
db66e574 JD |
866 | } |
867 | } | |
868 | } | |
869 | exit: | |
870 | error: | |
bd0514a5 | 871 | DBG("Thread exit"); |
92816cc3 | 872 | fini_thread_state(&thread); |
f620cc28 | 873 | end: |
412d7227 | 874 | health_unregister(the_health_sessiond); |
03732c32 JG |
875 | rcu_thread_offline(); |
876 | rcu_unregister_thread(); | |
db66e574 JD |
877 | return NULL; |
878 | } | |
64d9b072 JG |
879 | |
880 | static | |
881 | bool shutdown_rotation_thread(void *thread_data) | |
882 | { | |
7966af57 | 883 | struct rotation_thread_handle *handle = (rotation_thread_handle *) thread_data; |
64d9b072 JG |
884 | const int write_fd = lttng_pipe_get_writefd(handle->quit_pipe); |
885 | ||
886 | return notify_thread_pipe(write_fd) == 1; | |
887 | } | |
888 | ||
889 | bool launch_rotation_thread(struct rotation_thread_handle *handle) | |
890 | { | |
891 | struct lttng_thread *thread; | |
892 | ||
893 | thread = lttng_thread_create("Rotation", | |
894 | thread_rotation, | |
895 | shutdown_rotation_thread, | |
896 | NULL, | |
897 | handle); | |
898 | if (!thread) { | |
899 | goto error; | |
900 | } | |
901 | lttng_thread_put(thread); | |
902 | return true; | |
903 | error: | |
904 | return false; | |
905 | } |